{"id":6729,"date":"2024-10-31T04:28:18","date_gmt":"2024-10-31T04:28:18","guid":{"rendered":"https:\/\/premiumalu.com\/ultimate-guide-to-7075-t73-aluminum-properties\/"},"modified":"2026-09-13T07:02:53","modified_gmt":"2026-09-13T07:02:53","slug":"konecny-pruvodce-vlastnostmi-hliniku-7075-t73","status":"publish","type":"post","link":"https:\/\/premiumalu.com\/cs\/ultimate-guide-to-7075-t73-aluminum-properties\/","title":{"rendered":"Hlin\u00edk 7075 T73: Vlastnosti a aplikace"},"content":{"rendered":"

Co je slitina hlin\u00edku 7075?<\/h2>\n\n\n\n

7075 je slitina \u0159ady 7xxx postaven\u00e1 na zinku, ho\u0159\u010d\u00edku a m\u011bdi, kde je precipit\u00e1t MgZn\u2082 hlavn\u00ed zpev\u0148uj\u00edc\u00ed f\u00e1z\u00ed; pevnosti nab\u00fdv\u00e1 vytvrzov\u00e1n\u00edm precipitac\u00ed na \u00farove\u0148, kterou \u017e\u00e1dn\u00e1 jin\u00e1 b\u011b\u017en\u00e1 tv\u00e1\u0159en\u00e1 hlin\u00edkov\u00e1 slitina nedosahuje, co\u017e ji stav\u00ed do vlastn\u00ed t\u0159\u00eddy pro vysoce zat\u00ed\u017een\u00e9 konstrukce s kritickou hmotnost\u00ed. Tato \u0161pi\u010dkov\u00e1 pevnost je kompromis, pro kter\u00fd je slitina navr\u017eena \u2014 ale stejn\u00e1 chemie bohat\u00e1 na zinek a obsahuj\u00edc\u00ed m\u011b\u010f, kter\u00e1 poh\u00e1n\u00ed pevnost, tak\u00e9 \u010din\u00ed 7075 m\u00e9n\u011b odolnou v\u016f\u010di korozi a prakticky nesva\u0159itelnou metodami taven\u00ed.<\/p>\n\n\n\n

Cena t\u00e9to pevnosti se projevuje v provozu: ve vlhk\u00e9m, mo\u0159sk\u00e9m nebo chloridov\u00e9m prost\u0159ed\u00ed m\u016f\u017ee 7075 ve stavu \u0161pi\u010dkov\u00e9ho vytvrzen\u00ed prasknout p\u0159i trval\u00e9m tahov\u00e9m zat\u00ed\u017een\u00ed \u2014 jde o poruchov\u00fd re\u017eim zvan\u00fd korozn\u00ed prask\u00e1n\u00ed za nap\u011bt\u00ed (SCC), kter\u00fd \u017e\u00e1dn\u00fd n\u00e1t\u011br zcela neeliminuje. 7075 odpov\u00edd\u00e1 na toto riziko z\u00e1m\u011brn\u011b p\u0159est\u00e1rnut\u00fdm stavem T73, kter\u00fd odevzd\u00e1v\u00e1 \u010d\u00e1st \u0161pi\u010dkov\u00e9 pevnosti, aby byla slitina spolehliv\u00e1 tam, kde o konstrukci rozhoduje koroze a dlouh\u00e1 \u017eivotnost \u2014 a zda zvolit T73 nebo jeho od nap\u011bt\u00ed uvoln\u011bn\u00e9ho bratrance T7351, je rozhodnut\u00ed, kter\u00e9 vysv\u011btluje n\u00e1sleduj\u00edc\u00ed sekce.<\/p>\n\n\n\n

Porozum\u011bn\u00ed stavu T73<\/h2>\n\n\n\n

\u201cT73\u201d znamen\u00e1, \u017ee materi\u00e1l je rozpou\u0161t\u011bc\u00edm \u017e\u00edh\u00e1n\u00edm tepeln\u011b zpracov\u00e1n, zakalen a pot\u00e9 p\u0159est\u00e1rnut<\/strong> prost\u0159ednictv\u00edm dvoustup\u0148ov\u00e9ho procesu um\u011bl\u00e9ho st\u00e1rnut\u00ed. Slitina je zah\u0159\u00edv\u00e1na, aby se Zn\/Mg\/Cu rozpustily do tuh\u00e9ho roztoku, zakalena, aby je zachytila p\u0159esycen\u00e9, a pot\u00e9 st\u00e1rnuta ve dvou kroc\u00edch \u2014 stupe\u0148 s vy\u0161\u0161\u00ed teplotou, kter\u00fd zhrubne precipit\u00e1ty, n\u00e1sledovan\u00fd stabilizac\u00ed p\u0159i ni\u017e\u0161\u00ed teplot\u011b. P\u0159est\u00e1rnut\u00ed z\u00e1m\u011brn\u011b vede materi\u00e1l za \u0161pi\u010dkovou pevnost, tak\u017ee precipit\u00e1ty na hranic\u00edch zrn zhrubnou a stanou se elektrochemicky neaktivn\u00edmi, co\u017e sni\u017euje hnac\u00ed s\u00edlu pro mezikrystalov\u00e9 SCC. Krok, kter\u00fd definuje T73, je to druh\u00e9, p\u0159est\u00e1rnut\u00ed \u2014 to je to, co odli\u0161uje T73 od \u0161pi\u010dkov\u011b vytvrzen\u00e9ho T6.<\/p>\n\n\n\n

Co u\u017eivatel odevzd\u00e1v\u00e1, je ~12\u201315 % pevnosti T6 (UTS 505 vs 572 MPa; mez kluzu 435 vs 503 MPa), ale co z\u00edsk\u00e1v\u00e1 zp\u011bt, je rozhoduj\u00edc\u00ed: odolnost proti SCC sk\u00e1\u010de z m\u00edrn\u00e9 (T6) na vynikaj\u00edc\u00ed, \u017eivotnost v soln\u00e9 mlze se pohybuje p\u0159ibli\u017en\u011b 1500\u20132000 h oproti 500\u20131000 h u T6, lomov\u00e1 hou\u017eevnatost stoup\u00e1 na p\u0159ibli\u017en\u011b 28\u201333 MPa\u00b7\u221am oproti ~20\u201324 u T6 a ta\u017enost se zlep\u0161uje, tak\u017ee materi\u00e1l je m\u00e9n\u011b k\u0159ehk\u00fd a tolerantn\u011bj\u0161\u00ed k po\u0161kozen\u00ed. Pro jak\u00fdkoli d\u00edl, kter\u00fd \u017eije v korozi nebo p\u0159en\u00e1\u0161\u00ed cyklick\u00e9 zat\u00ed\u017een\u00ed, se tento kompromis t\u00e9m\u011b\u0159 v\u017edy vyplat\u00ed.<\/p>\n\n\n\n

T73 s\u00e1m je nezahrnuje:<\/strong> od nap\u011bt\u00ed uvoln\u011bn\u00fd, tak\u017ee siln\u011b obr\u00e1b\u011bn\u00e1 deska T73 se m\u016f\u017ee st\u00e1le pohybovat, jak je materi\u00e1l odeb\u00edr\u00e1n. Tato mezera je d\u016fvodem, pro\u010d existuje varianta \u201c51\u201d: T7351 p\u0159id\u00e1v\u00e1 po zakalen\u00ed prota\u017een\u00ed o 1,5\u20133 %, kombinuj\u00edc p\u0159est\u00e1rnutou odolnost proti korozi T73 se stabilitou obr\u00e1b\u011bn\u00ed T651. T7351 je leteck\u00fd standard pro siln\u00e9, obr\u00e1b\u011bn\u00e9 desky \u2014 je to volba, kdy\u017e pot\u0159ebujete jak odolnost proti korozi, tak rozm\u011brovou stabilitu po CNC pr\u00e1ci.<\/p>\n\n\n\n

Prvek<\/th>Typick\u00fd rozsah (7075)<\/th><\/tr><\/thead>
Zinek (Zn)<\/td>5.1\u20136.1%<\/td><\/tr>
Ho\u0159\u010d\u00edk (Mg)<\/td>2.1\u20132.9%<\/td><\/tr>
M\u011b\u010f (Cu)<\/td>1.2\u20132.0%<\/td><\/tr>
Chrom (Cr)<\/td>0.18\u20130.28%<\/td><\/tr>
K\u0159em\u00edk (Si)<\/td>max. 0,40 %<\/td><\/tr>
\u017delezo (Fe)<\/td>max. 0,50 %<\/td><\/tr>
Mangan (Mn)<\/td>max. 0,30 %<\/td><\/tr>
Titan (Ti)<\/td>max. 0,20 %<\/td><\/tr>
Hlin\u00edk (Al)<\/td>Bilance<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Chemie je identick\u00e1 s ka\u017ed\u00fdm jin\u00fdm stavem 7075 \u2014 rozd\u00edl je zcela v tepeln\u00e9m zpracov\u00e1n\u00ed, nikoli ve slo\u017een\u00ed. Zinek poskytuje prim\u00e1rn\u00ed zpevn\u011bn\u00ed, m\u011b\u010f p\u0159id\u00e1v\u00e1 tvrdost a chrom zlep\u0161uje odolnost proti SCC; T73 jednodu\u0161e manipuluje se strukturou precipit\u00e1t\u016f tak, aby n\u00e1chylnost ke korozi poh\u00e1n\u011bn\u00e1 m\u011bd\u00ed ji\u017e ne\u0159\u00eddila \u017eivotnost d\u00edlu.<\/p>\n\n\n\n

Jak se T73 li\u0161\u00ed od T6<\/h3>\n\n\n\n

T6 je \u0161pi\u010dkov\u011b vytvrzen v jedin\u00e9m kroku um\u011bl\u00e9ho st\u00e1rnut\u00ed (~120 \u00b0C) pro dosa\u017een\u00ed maxim\u00e1ln\u00ed pevnosti, s pouze m\u00edrnou odolnost\u00ed proti SCC. T73 prov\u00e1d\u00ed nav\u00edc stupe\u0148 p\u0159est\u00e1rnut\u00ed, p\u0159ij\u00edmaj\u00edc o ~12\u201315 % ni\u017e\u0161\u00ed UTS a mez kluzu, aby byla slitina odoln\u00e1 proti SCC a hou\u017eevnat\u011bj\u0161\u00ed. Slo\u017een\u00ed je stejn\u00e9; li\u0161\u00ed se pouze tepeln\u00e9 zpracov\u00e1n\u00ed. Kdy\u017e je ve h\u0159e koroze a d\u00edl mus\u00ed p\u0159e\u017e\u00edt dlouhou \u017eivotnost, vyhr\u00e1v\u00e1 T73; kdy\u017e je pevnost v\u0161\u00edm a prost\u0159ed\u00ed je such\u00e9 a kontrolovan\u00e9, v\u00fdhodu m\u00e1 T6. Pro \u0161pi\u010dkovou pevnost, od nap\u011bt\u00ed uvoln\u011bnou stranu rodiny, viz n\u00e1\u0161 kompletn\u00ed pr\u016fvodce 7075-T651<\/a>.<\/p>\n\n\n\n

Mechanick\u00e9 vlastnosti 7075-T73<\/h2>\n\n\n\n
\"\"<\/figure>\n\n\n\n

7075-T73 vym\u011b\u0148uje \u010d\u00e1st \u0161pi\u010dkov\u00e9 pevnosti za odolnost proti korozi a hou\u017eevnatost \u2014 \u010d\u00edsla n\u00ed\u017ee jsou typick\u00e1 pro desku, plech a ty\u010d.<\/p>\n\n\n\n

Majetek<\/th>7075-T73<\/th>7075-T6 (referen\u010dn\u00ed)<\/th><\/tr><\/thead>
Hustota<\/td>2,81 g\/cm\u00b3<\/td>2,81 g\/cm\u00b3<\/td><\/tr>
Pevnost v tahu<\/td>~505 MPa (73 ksi)<\/td>~572 MPa (83 ksi)<\/td><\/tr>
Mez kluzu (0,2 % offset)<\/td>~435 MPa (63 ksi)<\/td>~503 MPa (73 ksi)<\/td><\/tr>
Ta\u017enost p\u0159i p\u0159etr\u017een\u00ed<\/td>13%<\/td>11%<\/td><\/tr>
\u00danavov\u00e1 pevnost<\/td>~130\u2013150 MPa<\/td>~160 MPa<\/td><\/tr>
Tvrdost podle Brinella<\/td>~135 HB<\/td>~150 HB<\/td><\/tr>
Modul pru\u017enosti (Young\u016fv modul)<\/td>~71,7 GPa<\/td>~71,7 GPa<\/td><\/tr>
Pevnost ve smyku<\/td>~290 MPa<\/td>~331 MPa<\/td><\/tr>
Lomov\u00e1 hou\u017eevnatost (KIC)<\/td>~28\u201333 MPa\u00b7\u221am<\/td>~20\u201324 MPa\u00b7\u221am<\/td><\/tr>
Tepeln\u00e1 vodivost<\/td>~130 W\/m-K<\/td>~130 W\/m-K<\/td><\/tr>
Elektrick\u00e1 vodivost<\/td>~33\u201340 % IACS<\/td>~33 % IACS<\/td><\/tr>
Sou\u010dinitel tepeln\u00e9 rozta\u017enosti<\/td>23 \u00b5m\/m\u00b7K<\/td>23 \u00b5m\/m\u00b7K<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Mez kluzu ~435 MPa je \u010d\u00edslo, kter\u00e9 matters nejv\u00edce: asi o 15 % ni\u017e\u0161\u00ed ne\u017e 503 u T6, ale st\u00e1le p\u0159ibli\u017en\u011b 2,4\u00d7 mez kluzu 6061-T6 a v\u00fdrazn\u011b nad jakoukoli t\u0159\u00eddou 6xxx. Co si za toto sn\u00ed\u017een\u00ed kupujete, je lomov\u00e1 hou\u017eevnatost (~28\u201333 versus ~20\u201324 MPa\u00b7\u221am) a odolnost proti SCC, kter\u00e1 je vynikaj\u00edc\u00ed sp\u00ed\u0161e ne\u017e m\u00edrn\u00e1, tak\u017ee d\u00edl z T73 toleruje trhliny a korozi daleko l\u00e9pe ne\u017e T6. Hustota, modul a tepeln\u00e1 rozta\u017enost jsou vlastnosti na \u00farovni slitiny a identick\u00e9 u ka\u017ed\u00e9ho stavu 7075 \u2014 pouze pevnost a korozn\u00ed chov\u00e1n\u00ed se m\u011bn\u00ed s tepeln\u00fdm zpracov\u00e1n\u00edm. Pro mezi-slitinov\u00fd p\u0159ehled viz n\u00e1\u0161 srovn\u00e1vac\u00ed pr\u016fvodce 6061 vs 7075<\/a>.<\/p>\n\n\n\n

Kde se 7075-T73 pou\u017e\u00edv\u00e1<\/h2>\n\n\n\n
\"\"<\/figure>\n\n\n\n

7075-T73 si vydob\u00fdv\u00e1 sv\u00e9 m\u00edsto v\u0161ude tam, kde o konstrukci rozhoduje SCC, lomov\u00e1 hou\u017eevnatost nebo dlouh\u00e1 \u017eivotnost \u2014 a kde u\u017eivatel m\u016f\u017ee p\u0159ijmout o ~15 % ni\u017e\u0161\u00ed pevnost ne\u017e T6, aby toho dos\u00e1hl. Vlastn\u00ed korozn\u011b exponovan\u00fd, k po\u0161kozen\u00ed tolerantn\u00ed konec rozsahu 7075, kter\u00fd T6 a T651 p\u0159enech\u00e1vaj\u00ed such\u00fdm, chr\u00e1n\u011bn\u00fdm, na pevnost kritick\u00fdm rol\u00edm.<\/p>\n\n\n\n

Leteck\u00e9 konstrukce v korozn\u00edm nebo cyklick\u00e9m provozu<\/h3>\n\n\n\n

Potahy k\u0159\u00eddel a panely, r\u00e1my trupu, p\u0159ep\u00e1\u017eky, sou\u010d\u00e1sti podvozku a d\u00edly rotor\u016f vrtuln\u00edk\u016f pou\u017e\u00edvaj\u00ed T73, proto\u017ee p\u0159est\u00e1rnut\u00e1 struktura odol\u00e1v\u00e1 SCC a r\u016fstu trhlin po desetilet\u00ed letu. Jde o vysoce hodnotn\u00e9, obt\u00ed\u017en\u011b kontrolovateln\u00e9 konstrukce, kde je jedin\u00e1 koroz\u00ed poh\u00e1n\u011bn\u00e1 trhlina nep\u0159ijateln\u00e1, tak\u017ee hou\u017eevnatost a rezerva SCC u T73 maj\u00ed v\u011bt\u0161\u00ed hodnotu ne\u017e ztracen\u00e1 \u0161pi\u010dkov\u00e1 pevnost. Pro obr\u00e1b\u011bn\u00e9 siln\u00e9 desky v t\u011bchto rol\u00edch je obvyklou specifikac\u00ed T7351.<\/p>\n\n\n\n

Mo\u0159sk\u00fd, offshore a vlhkomiln\u00fd hardware<\/h3>\n\n\n\n

Konstrukce lod\u00ed a \u010dlun\u016f, konzoly offshore plo\u0161in, sou\u010d\u00e1sti n\u00e1mo\u0159n\u00edch letadel a pob\u0159e\u017en\u00ed infrastruktura pou\u017e\u00edvaj\u00ed T73, proto\u017ee vynikaj\u00edc\u00ed odolnost proti SCC a exfoliaci p\u0159e\u017eije vystaven\u00ed chlorid\u016fm, kter\u00e9 by popraskalo T6. T73 (nebo T7351 pro obr\u00e1b\u011bn\u00e9 d\u00edly) je volen p\u0159ed T6 pr\u00e1v\u011b proto, \u017ee prost\u0159ed\u00ed je mokr\u00e9 \u2014 pevnost, kterou T6 odevzd\u00e1v\u00e1, je cena za to, \u017ee z\u016fstane neporu\u0161en\u00fd. Krom\u011b letectv\u00ed a mo\u0159sk\u00e9ho prost\u0159ed\u00ed se T73 objevuje ve vysoce v\u00fdkonn\u00e9m sportovn\u00edm zbo\u017e\u00ed a automobilov\u00fdch d\u00edlech, kde je vy\u017eadov\u00e1na jak pevnost, tak odolnost proti korozi.<\/p>\n\n\n\n

T73 vs jin\u00e9 stavy 7075 \u2014 jak vybrat<\/h2>\n\n\n\n

7075-T73 je p\u0159est\u00e1rnut\u00e1, na korozi orientovan\u00e1 volba; ostatn\u00ed stavy vym\u011b\u0148uj\u00ed pevnost za r\u016fzn\u00e9 priority (stabilita obr\u00e1b\u011bn\u00ed, \u0161pi\u010dkov\u00e1 pevnost nebo tva\u0159itelnost).<\/p>\n\n\n\n

Temperament<\/th>Zpracov\u00e1n\u00ed<\/th>Mez pevnosti (MPa)<\/th>MS (MPa)<\/th>Odolnost proti SCC<\/th>Nejlep\u0161\u00ed pro<\/th>Vyhnout se, kdy\u017e<\/th><\/tr><\/thead>
T73<\/td>Rozpou\u0161t\u011bc\u00ed \u017e\u00edh\u00e1n\u00ed + p\u0159est\u00e1rnut\u00ed (bez prota\u017een\u00ed)<\/td>~505<\/td>~435<\/td>Vynikaj\u00edc\u00ed<\/td>Korozivn\u00ed, mo\u0159sk\u00e9, dlouhodob\u011b zat\u00ed\u017een\u00e9 konstrukce<\/td>Tlust\u00e1 deska obr\u00e1b\u011bn\u00e1 s \u00fazk\u00fdmi tolerancemi (bez \u017e\u00edh\u00e1n\u00ed na odstran\u011bn\u00ed pnut\u00ed)<\/td><\/tr>
T7351<\/td>Rozpou\u0161t\u011bc\u00ed \u017e\u00edh\u00e1n\u00ed + ta\u017een\u00ed + p\u0159est\u00e1rnut\u00ed<\/td>~505<\/td>~435<\/td>Vynikaj\u00edc\u00ed<\/td>Korozivn\u00ed + p\u0159esn\u011b obr\u00e1b\u011bn\u00e1 deska<\/td>Je po\u017eadov\u00e1na \u0161pi\u010dkov\u00e1 pevnost<\/td><\/tr>
T651<\/td>Rozpou\u0161t\u011bc\u00ed \u017e\u00edh\u00e1n\u00ed + ta\u017een\u00ed + \u0161pi\u010dkov\u00e9 st\u00e1rnut\u00ed<\/td>~572<\/td>~503<\/td>M\u00edrn\u00e1<\/td>Such\u00e1, chr\u00e1n\u011bn\u00e1, p\u0159esn\u011b obr\u00e1b\u011bn\u00e1 deska<\/td>Vlhkost, mo\u0159sk\u00e9 prost\u0159ed\u00ed nebo expozice chlorid\u016fm<\/td><\/tr>
T6<\/td>Rozpou\u0161t\u011bc\u00ed \u017e\u00edh\u00e1n\u00ed + \u0161pi\u010dkov\u00e9 st\u00e1rnut\u00ed<\/td>~572<\/td>~503<\/td>M\u00edrn\u00e1<\/td>Maxim\u00e1ln\u00ed pevnost, such\u00e9\/kontrolovan\u00e9 prost\u0159ed\u00ed<\/td>Korozn\u00ed nebo cyklick\u00e9 zat\u00ed\u017een\u00ed<\/td><\/tr>
O<\/td>\u017d\u00edhan\u00e9<\/td>~250<\/td>~110<\/td>Dobr\u00fd<\/td>Tv\u00e1\u0159en\u00ed, vyst\u0159ihov\u00e1n\u00ed, ostr\u00e9 ohyby<\/td>Jak\u00e9koli nosn\u00e9 pou\u017eit\u00ed<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Kdy je T73 spr\u00e1vnou volbou<\/h3>\n\n\n\n

Zvolte T73, kdy\u017e je d\u00edl vystaven trval\u00e9 vlhkosti, soln\u00e9 mlze nebo chlorid\u016fm a nem\u016f\u017ee b\u00fdt pln\u011b chr\u00e1n\u011bn povlakem \u2014 vym\u011bn\u00edte ~12\u201315 % meze kluzu za odolnost proti SCC, kter\u00e1 je o \u0159\u00e1dy lep\u0161\u00ed, a \u017eivotnost v soln\u00e9 mlze p\u0159ibli\u017en\u011b 2\u20133\u00d7 del\u0161\u00ed ne\u017e u T6. Zvolte T73, kdy\u017e d\u00edl p\u0159en\u00e1\u0161\u00ed cyklick\u00e9 zat\u00ed\u017een\u00ed nebo mus\u00ed tolerovat r\u016fst trhliny po dlouhou \u017eivotnost (trup letadla, podvozek) \u2014 vy\u0161\u0161\u00ed lomov\u00e1 hou\u017eevnatost a odolnost proti po\u0161kozen\u00ed jsou d\u016fle\u017eit\u011bj\u0161\u00ed ne\u017e \u0161pi\u010dkov\u00e1 pevnost.<\/p>\n\n\n\n

Kdy se hod\u00ed jin\u00e9 temperov\u00e1n\u00ed<\/h3>\n\n\n\n

P\u0159istupte k T7351, kdy\u017e je d\u00edl obr\u00e1b\u011bn z tlust\u00e9 desky a<\/strong> a \u010del\u00ed korozi \u2014 zachov\u00e1te odolnost T73 proti SCC plus krok ta\u017een\u00ed, kter\u00fd zabra\u0148uje deformaci b\u011bhem CNC obr\u00e1b\u011bn\u00ed. Zachovejte T6 nebo T651, kdy\u017e je prost\u0159ed\u00ed such\u00e9 a chr\u00e1n\u011bn\u00e9 a rozhoduj\u00edc\u00edm faktorem je pevnost nebo obr\u00e1b\u011bc\u00ed stabilita \u2014 T73 by v\u00e1s st\u00e1l pouze pevnost, kter\u00e9 se nemus\u00edte vzd\u00e1t. Pro jak\u00fdkoli d\u00edl, kter\u00fd mus\u00ed b\u00fdt tavn\u011b sva\u0159ov\u00e1n nebo tv\u00e1\u0159en s ostr\u00fdmi polom\u011bry, opus\u0165te 7075 zcela: 6061-T6 se sva\u0159uje a tv\u00e1\u0159\u00ed mnohem l\u00e9pe (viz n\u00e1\u0161 kompletn\u00ed pr\u016fvodce 6061-T6<\/a>) a stav O je jedin\u00fd stav 7075 vhodn\u00fd pro n\u00e1ro\u010dn\u00e9 tv\u00e1\u0159en\u00ed.<\/p>\n\n\n\n

Pr\u00e1ce s 7075-T73 \u2014 co pot\u0159ebujete v\u011bd\u011bt<\/h2>\n\n\n\n
\"\"<\/figure>\n\n\n\n
    \n
  • Obr\u00e1b\u011bn\u00ed.<\/strong> T73 se dob\u0159e obr\u00e1b\u00ed \u2014 jeho m\u00edrn\u011b m\u011bk\u010d\u00ed povrch znamen\u00e1 o n\u011bco men\u0161\u00ed opot\u0159eben\u00ed n\u00e1stroje ne\u017e u T6 a p\u0159est\u00e1rnut\u00ed sni\u017euje zbytkov\u00e9 pnut\u00ed, tak\u017ee udr\u017euje tolerance b\u011bhem \u0159ezu. Pou\u017e\u00edvejte ostr\u00e9 karbidov\u00e9 n\u00e1stroje a dobr\u00fd pr\u016ftok chladic\u00ed kapaliny; o\u010dek\u00e1vejte \u010dist\u00e9 povrchy pro formy, p\u0159\u00edpravky a pr\u00e1ce na trupu letadla, s lep\u0161\u00ed rozm\u011brovou stabilitou ne\u017e u T6 bez odstran\u011bn\u00ed pnut\u00ed.<\/li>\n\n\n\n
  • Sva\u0159ov\u00e1n\u00ed.<\/strong> 7075 se nedoporu\u010duje pro tavn\u00e9 sva\u0159ov\u00e1n\u00ed \u2014 obloukov\u00e9 procesy zp\u016fsobuj\u00ed hork\u00e9 prask\u00e1n\u00ed, zm\u011bk\u010duj\u00ed z\u00f3nu svaru o 40\u201350 % a zanech\u00e1vaj\u00ed zbytkov\u00e9 pnut\u00ed, kter\u00e9 zve SCC v provozu. Pro konstruk\u010dn\u00ed spoje navrhujte n\u00fdtov\u00e1n\u00ed, \u0161roubov\u00e1n\u00ed nebo lepen\u00ed; t\u0159en\u00ed sva\u0159ov\u00e1n\u00ed (FSW) m\u016f\u017ee zachovat v\u011bt\u0161inu z\u00e1kladn\u00ed pevnosti pro nekritick\u00e9 svary, ale tavn\u011b sva\u0159ovan\u00e1 zat\u011b\u017eovac\u00ed dr\u00e1ha z 7075 by nem\u011bla b\u00fdt vr\u00e1cena do provozu.<\/li>\n\n\n\n
  • Protikorozn\u00ed ochrana.<\/strong> T73 ji\u017e m\u00e1 vynikaj\u00edc\u00ed odolnost proti SCC a exfoliaci, tak\u017ee vy\u017eaduje m\u00e9n\u011b dopl\u0148kov\u00e9 ochrany ne\u017e T6 \u2014 ale v n\u00e1ro\u010dn\u00e9m mo\u0159sk\u00e9m provozu st\u00e1le specifikujte anodizaci (Typ II nebo III), chrom\u00e1tov\u00fd konverzn\u00ed povlak (Alodine), pl\u00e1tov\u00e1n\u00ed nebo n\u00e1t\u011br. T73 je stav, kter\u00fd zvolit, kdy\u017e samotn\u00fd povlak nem\u016f\u017ee b\u00fdt spolehliv\u011b pou\u017eit pro korozn\u00ed riziko.<\/li>\n\n\n\n
  • Tv\u00e1\u0159itelnost.<\/strong> T73 m\u00e1 \u0161patnou tva\u0159itelnost a prask\u00e1 p\u0159i ohybech s ostr\u00fdm polom\u011brem; tvarujte ve stavu O a pot\u00e9 tepeln\u011b zpracujte hotov\u00fd tvar na T73 po tvarov\u00e1n\u00ed \u2014 neo\u010dek\u00e1vejte, \u017ee budete tvarovat T73 p\u0159\u00edmo. P\u0159est\u00e1rnut\u00fd stav je stanoven tepeln\u00fdm zpracov\u00e1n\u00edm, nikoli za studena.<\/li>\n<\/ul>\n\n\n\n

    V\u00fdhody a omezen\u00ed na prvn\u00ed pohled<\/h2>\n\n\n\n
    Rozm\u011br<\/th>V\u00fdhoda<\/th>Omezen\u00ed<\/th><\/tr><\/thead>
    Pom\u011br pevnosti k hmotnosti<\/td>Vysok\u00e1 (~435 MPa mez kluzu, ~2,4\u00d7 6061-T6)<\/td>~15 % pod \u0161pi\u010dkou T6\/T651<\/td><\/tr>
    Odolnost proti SCC<\/td>Vynikaj\u00edc\u00ed (soln\u00ed mlha 1500\u20132000 h)<\/td>V extr\u00e9mn\u00edm mo\u0159sk\u00e9m prost\u0159ed\u00ed st\u00e1le vy\u017eaduje povlak<\/td><\/tr>
    Lomov\u00e1 hou\u017eevnatost<\/td>~28\u201333 MPa\u00b7\u221am, tolerantn\u00ed k trhlin\u00e1m<\/td>\u2014<\/td><\/tr>
    Obr\u00e1b\u011bn\u00ed<\/td>Dobr\u00e1; ni\u017e\u0161\u00ed zbytkov\u00e9 pnut\u00ed ne\u017e T6<\/td>Bez odstran\u011bn\u00ed pnut\u00ed, pokud nen\u00ed specifikov\u00e1no T7351<\/td><\/tr>
    Koroze<\/td>Vynikaj\u00edc\u00ed odolnost proti exfoliaci + SCC<\/td>Vzd\u00e1v\u00e1 se \u0161pi\u010dkov\u00e9 pevnosti, aby ji z\u00edskal<\/td><\/tr>
    Sva\u0159itelnost<\/td>FSW provediteln\u00e9 pro nekritick\u00e9 spoje<\/td>Tavn\u00e9 sva\u0159ov\u00e1n\u00ed se nedoporu\u010duje<\/td><\/tr>
    Dostupnost<\/td>Skladem jako deska, plech, ty\u010d, trubka<\/td>Tenkost\u011bnn\u00e9 a speci\u00e1ln\u00ed profily m\u00e9n\u011b b\u011b\u017en\u00e9<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    Z\u00e1v\u011br<\/h2>\n\n\n\n

    Kompromis je jasn\u00fd: 7075-T73 se vzd\u00e1v\u00e1 ~12\u201315 % \u0161pi\u010dkov\u00e9 pevnosti T6, aby poskytl vynikaj\u00edc\u00ed odolnost proti korozn\u00edmu prask\u00e1n\u00ed, vy\u0161\u0161\u00ed lomovou hou\u017eevnatost a lep\u0161\u00ed odolnost proti po\u0161kozen\u00ed \u2014 spr\u00e1vn\u00e1 volba v\u017edy, kdy\u017e o konstrukci rozhoduje koroze, cyklick\u00e9 zat\u00ed\u017een\u00ed nebo dlouh\u00e1 \u017eivotnost, a \u0161patn\u00e1 volba v such\u00fdch, na pevnost kritick\u00fdch rol\u00edch, kde vyhr\u00e1v\u00e1 T6 nebo T651. Zvolte T73 nebo T7351, kdy\u017e je ve h\u0159e chlorid nebo vlhkost; zvolte T6 nebo T651, kdy\u017e je prost\u0159ed\u00ed kontrolovan\u00e9 a rozhoduj\u00edc\u00edm faktorem je \u0161pi\u010dkov\u00e1 pevnost nebo obr\u00e1b\u011bc\u00ed stabilita.<\/p>\n\n\n\n

    Na adrese Hlin\u00edk Linsy<\/strong>, m\u00e1me 7075-T73 skladem v desk\u00e1ch, plech\u00e1ch, ty\u010d\u00edch a trubk\u00e1ch, s T7351 a dal\u0161\u00edmi stavy 7075 (T6, T651) dostupn\u00fdmi ve v\u0161ech form\u00e1ch. Ka\u017ed\u00e1 objedn\u00e1vka je dod\u00e1na s hutn\u00edm atestem a na vy\u017e\u00e1d\u00e1n\u00ed jsou k dispozici zpr\u00e1vy SGS o slo\u017een\u00ed, mechanick\u00fdch vlastnostech a ultrazvukov\u00e9m zkou\u0161en\u00ed (tlust\u00e9 desky). N\u00e1\u0161 t\u00fdm zkontroluje v\u00e1\u0161 v\u00fdkres, upozorn\u00ed na riziko SCC d\u0159\u00edve, ne\u017e p\u0159edimenzujete, a doporu\u010d\u00ed T73 versus T7351 na z\u00e1klad\u011b toho, zda je d\u00edl obr\u00e1b\u011bn. Po\u0161lete v\u00fdkres a po\u017eadavky a vr\u00e1t\u00edme v\u00e1m posouzen\u00ed vhodnosti materi\u00e1lu a cenovou nab\u00eddku.<\/strong><\/p>\n\n\n\n

    \u010casto kladen\u00e9 ot\u00e1zky<\/h2>\n\n\n\n

    Je 7075-T73 slab\u0161\u00ed ne\u017e T6?<\/h3>\n\n\n\n

    Ano, p\u0159ibli\u017en\u011b o 12\u201315 % \u2014 mez pevnosti kles\u00e1 z ~572 na ~505 MPa a mez kluzu z ~503 na ~435 MPa. Co z\u00edsk\u00e1te, je odolnost proti SCC (vynikaj\u00edc\u00ed versus st\u0159edn\u00ed), lomov\u00e1 hou\u017eevnatost (~28\u201333 versus ~20\u201324 MPa\u00b7\u221am) a lep\u0161\u00ed odolnost proti po\u0161kozen\u00ed, tak\u017ee pro jak\u00fdkoli korozivn\u00ed nebo dlouho\u017eivotnostn\u00ed d\u00edl je ni\u017e\u0161\u00ed pevnost spr\u00e1vnou volbou.<\/p>\n\n\n\n

    7075-T73 vs T7351: kter\u00fd bych m\u011bl zvolit?<\/h3>\n\n\n\n

    Oba maj\u00ed stejnou p\u0159est\u00e1rnutou korozn\u00ed odolnost; T7351 p\u0159id\u00e1v\u00e1 ta\u017een\u00ed pro odstran\u011bn\u00ed pnut\u00ed o 1,5\u20133 %. Zvolte T7351, kdy\u017e je d\u00edl CNC obr\u00e1b\u011bn z tlust\u00e9 desky, proto\u017ee ta\u017een\u00ed zabra\u0148uje deformaci p\u0159i odeb\u00edr\u00e1n\u00ed materi\u00e1lu. Zvolte prost\u00fd T73, kdy\u017e je tv\u00e1\u0159en\u00ed nebo dokon\u010dov\u00e1n\u00ed lehk\u00e9 a obr\u00e1b\u011bc\u00ed stabilita nen\u00ed rozhoduj\u00edc\u00edm faktorem.<\/p>\n\n\n\n

    Lze 7075-T73 sva\u0159ovat?<\/h3>\n\n\n\n

    Ne tavn\u00fdm sva\u0159ov\u00e1n\u00edm. Obloukov\u00e9 procesy zp\u016fsobuj\u00ed hork\u00e9 prask\u00e1n\u00ed, zm\u011bk\u010duj\u00ed z\u00f3nu svaru o 40\u201350 % a zanech\u00e1vaj\u00ed riziko SCC v provozu, tak\u017ee konstruk\u010dn\u00ed spoje z 7075 se n\u00fdtuj\u00ed, \u0161roubuj\u00ed nebo lep\u00ed. T\u0159en\u00ed sva\u0159ov\u00e1n\u00ed m\u016f\u017ee fungovat pro nekritick\u00e9 svary a zachov\u00e1v\u00e1 v\u011bt\u0161inu z\u00e1kladn\u00ed pevnosti, ale tavn\u011b sva\u0159ovan\u00e1 zat\u011b\u017eovac\u00ed dr\u00e1ha z 7075 by nem\u011bla b\u00fdt vr\u00e1cena do provozu.<\/p>\n\n\n\n

    Je 7075-T73 vhodn\u00fd pro mo\u0159sk\u00e9 nebo venkovn\u00ed pou\u017eit\u00ed?<\/h3>\n\n\n\n

    Ano \u2014 je preferovan\u00fdm stavem 7075 pro mo\u0159sk\u00e9, pob\u0159e\u017en\u00ed a offshore aplikace d\u00edky sv\u00e9 vynikaj\u00edc\u00ed odolnosti proti SCC a exfoliaci v chloridov\u00e9m prost\u0159ed\u00ed. V extr\u00e9mn\u00ed expozici st\u00e1le t\u011b\u017e\u00ed z anodizace, Alodine nebo n\u00e1t\u011bru, ale na rozd\u00edl od T6 je specifikov\u00e1n pr\u00e1v\u011b proto, \u017ee samotn\u00e9mu povlaku nelze spolehliv\u011b sv\u011b\u0159it riziko.<\/p>\n\n\n\n

    M\u00e1 Linsy 7075-T73 skladem a jak\u00e1 je dodac\u00ed lh\u016fta?<\/h3>\n\n\n\n

    Ano. Skladov\u00e9 desky, plechy, ty\u010de a trubky se expeduj\u00ed ze skladu; nestandardn\u00ed rozm\u011bry a stavy (v\u010detn\u011b T7351) se vyr\u00e1b\u011bj\u00ed na zak\u00e1zku s typickou dodac\u00ed lh\u016ftou 10\u201360 dn\u00ed v z\u00e1vislosti na slitin\u011b, rozm\u011brech a zpracov\u00e1n\u00ed. Linsy podporuje zak\u00e1zkovou v\u00fdrobu s n\u00edzk\u00fdm MOQ, tak\u017ee objedn\u00e1vky 7075 se sm\u00ed\u0161en\u00fdmi specifikacemi nebo obt\u00ed\u017en\u011bji dostupn\u00fdmi polo\u017ekami jen z\u0159\u00eddka blokuj\u00ed projekt.<\/p>","protected":false},"excerpt":{"rendered":"

    What Is 7075 Aluminum? 7075 is a 7xxx-series alloy built around zinc, magnesium, and copper, where the MgZn\u2082 precipitate is the main strengthening phase; it gains strength through precipitation hardening to a level no other common wrought aluminum matches, which puts it in a class of its own for high-load, weight-critical structures. That peak strength […]<\/p>\n","protected":false},"author":3,"featured_media":10524,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"7075-T73 Aluminum: Properties, T6 Comparison & Applications","_seopress_titles_desc":"Complete guide to 7075-T73 aluminum: mechanical properties, chemical composition, T73 vs T6 comparison, stress-corrosion cracking resistance, and aerospace applications.","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_seopress_analysis_target_kw":"","footnotes":""},"categories":[179],"tags":[],"class_list":["post-6729","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-7000-series-aluminum"],"_links":{"self":[{"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/posts\/6729","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/comments?post=6729"}],"version-history":[{"count":4,"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/posts\/6729\/revisions"}],"predecessor-version":[{"id":10527,"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/posts\/6729\/revisions\/10527"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/media\/10524"}],"wp:attachment":[{"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/media?parent=6729"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/categories?post=6729"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/tags?post=6729"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}