{"id":6813,"date":"2024-11-06T03:57:56","date_gmt":"2024-11-06T03:57:56","guid":{"rendered":"https:\/\/premiumalu.com\/mastering-7075-t651-aluminum-alloy-a-comprehensive-guide\/"},"modified":"2026-09-13T06:59:18","modified_gmt":"2026-09-13T06:59:18","slug":"zvladnuti-hlinikove-slitiny-7075-t651-komplexni-pruvodce","status":"publish","type":"post","link":"https:\/\/premiumalu.com\/cs\/mastering-7075-t651-aluminum-alloy-a-comprehensive-guide\/","title":{"rendered":"Komplexn\u00ed pr\u016fvodce hlin\u00edkovou slitinou 7075-T651"},"content":{"rendered":"

7075-T651 je temper 7075 s vrcholovou pevnost\u00ed a odstran\u011bn\u00fdm pnut\u00edm \u2014 jakost hlin\u00edku, po kter\u00e9 s\u00e1hnou konstrukt\u00e9\u0159i, kdy\u017e mus\u00ed d\u00edl n\u00e9st zat\u00ed\u017een\u00ed srovnateln\u00e9 s ocel\u00ed p\u0159i zlomku hmotnosti. Tato p\u0159\u00edru\u010dka pokr\u00fdv\u00e1, co ozna\u010den\u00ed T651 znamen\u00e1, skute\u010dn\u00e9 hodnoty, jak se srovn\u00e1v\u00e1 s T6 a temperami odoln\u00fdmi proti korozi, a kde se jeho pevnost vyplat\u00ed \u2014 abyste mohli rozhodnout, zda vrcholov\u00e1 pevnost a obrobitelnost T651 stoj\u00ed za jeho limity v oblasti koroze a spojov\u00e1n\u00ed.<\/p>\n\n\n\n

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

Cenou za tuto pevnost je \u00fazk\u00e9 procesn\u00ed okno: 7075 mus\u00ed b\u00fdt chr\u00e1n\u011bn p\u0159ed koroz\u00ed a spojov\u00e1n mechanick\u00fdm upevn\u011bn\u00edm, nikoli sva\u0159ov\u00e1n\u00edm, a zvolen\u00fd temper ur\u010duje, jak velk\u00e9 zbytkov\u00e9 pnut\u00ed obroben\u00fd d\u00edl ponese. Pr\u00e1v\u011b ot\u00e1zka zbytkov\u00e9ho pnut\u00ed \u2014 a zda v\u00e1\u0161 d\u00edl vy\u017eaduje t\u011bsnou rozm\u011brovou stabilitu po t\u011b\u017ek\u00e9m obr\u00e1b\u011bn\u00ed \u2014 \u010din\u00ed z temperu T651 v\u00fdchoz\u00ed volbu pro p\u0159esnou pr\u00e1ci, co\u017e vysv\u011btluje n\u00e1sleduj\u00edc\u00ed \u010d\u00e1st.<\/p>\n\n\n\n

Porozum\u011bn\u00ed temperu T651<\/h2>\n\n\n\n

\u201cT651\u201d znamen\u00e1, \u017ee materi\u00e1l je rozpou\u0161t\u011bc\u00edm \u017e\u00edh\u00e1n\u00edm tepeln\u011b zpracov\u00e1n, zakalen, zbaven pnut\u00ed ta\u017een\u00edm a pot\u00e9 um\u011ble st\u00e1rnut. Slitina je zah\u0159\u00e1ta, aby se Zn\/Mg\/Cu rozpustily do tuh\u00e9ho roztoku, zakalena, aby je zachytila v p\u0159esycen\u00e9m stavu, ta\u017eena o 1\u20133 % pro uvoln\u011bn\u00ed z\u00e1kalov\u00fdch pnut\u00ed uzam\u010den\u00fdch v desce, a pot\u00e9 dr\u017eena p\u0159i st\u00e1rnouc\u00ed teplot\u011b, aby precipit\u00e1ty MgZn\u2082 dos\u00e1hly vrcholov\u00e9 pevnosti. Ta\u017een\u00ed je krok, kter\u00fd odli\u0161uje T651 od prost\u00e9ho T6.<\/p>\n\n\n\n

Toto ta\u017een\u00ed pln\u00ed jeden \u00fakol, kter\u00fd je d\u016fle\u017eit\u00fd pro ka\u017ed\u00e9ho obr\u00e1b\u011b\u010de: odstra\u0148uje zbytkov\u00e9 pnut\u00ed, kter\u00e9 by jinak zp\u016fsobilo, \u017ee se d\u00edl vymkne toleranci v okam\u017eiku, kdy je odebr\u00e1n materi\u00e1l. V siln\u00e9 desce 7075 zanech\u00e1v\u00e1 zakalen\u00ed vnit\u0159n\u00ed pnut\u00ed dostate\u010dn\u011b vysok\u00e9 na to, aby zkroutilo hotovou sou\u010d\u00e1st b\u011bhem CNC obr\u00e1b\u011bn\u00ed; T651 je uvol\u0148uje p\u0159edem, tak\u017ee d\u00edl si po obroben\u00ed udr\u017e\u00ed tvar. Leteck\u00e9 specifikace pro siln\u00e9 obroben\u00e9 desky proto vy\u017eaduj\u00ed T651 nam\u00edsto T6.<\/p>\n\n\n\n

Chemie 7075 je d\u016fvodem, pro\u010d se T651 umis\u0165uje na vrcholu tabulky pevnosti hlin\u00edku \u2014 zinek (5,1\u20136,1 %) je prim\u00e1rn\u00edm zpev\u0148uj\u00edc\u00edm prvkem, ho\u0159\u010d\u00edk umo\u017e\u0148uje precipita\u010dn\u00ed reakci a m\u011b\u010f p\u0159id\u00e1v\u00e1 tvrdost, zat\u00edmco chrom (0,18\u20130,28 %) zlep\u0161uje odolnost proti korozn\u00edmu prask\u00e1n\u00ed za nap\u011bt\u00ed. Nic z toho nen\u00ed zdarma: m\u011b\u010f tak\u00e9 sni\u017euje korozn\u00ed chov\u00e1n\u00ed ve srovn\u00e1n\u00ed se slitinami 6xxx, co\u017e je omezen\u00ed, kolem kter\u00e9ho mus\u00ed b\u00fdt navr\u017eena ka\u017ed\u00e1 aplikace 7075.<\/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

Jak se T651 li\u0161\u00ed od T6<\/h3>\n\n\n\n
\"\"<\/figure>\n\n\n\n

T6 a T651 dosahuj\u00ed v podstat\u011b stejn\u00e9 vrcholov\u00e9 pevnosti \u2014 ta\u017een\u00ed T651 prob\u00edh\u00e1 po zakalen\u00ed a p\u0159ed st\u00e1rnut\u00edm, tak\u017ee nem\u011bn\u00ed kone\u010dnou tvrdost ani mez kluzu. Co se m\u011bn\u00ed, je zbytkov\u00e9 pnut\u00ed: T651 nese mnohem m\u00e9n\u011b, tak\u017ee siln\u011b obroben\u00e1 deska z\u016fst\u00e1v\u00e1 ploch\u00e1 a rozm\u011brov\u011b stabiln\u00ed, zat\u00edmco T6 se m\u016f\u017ee deformovat, jak se vnit\u0159n\u00ed pnut\u00ed uvol\u0148uje odb\u011brem materi\u00e1lu. Pro tenk\u00e9 pr\u016f\u0159ezy a d\u00edly s lehk\u00fdm obr\u00e1b\u011bn\u00edm sta\u010d\u00ed T6 a je o n\u011bco levn\u011bj\u0161\u00ed; pro siln\u00e9 desky, p\u0159\u00edpravky a jak\u00fdkoli d\u00edl dr\u017een\u00fd v t\u011bsn\u00fdch toleranc\u00edch po CNC pr\u00e1ci je T651 bezpe\u010dn\u011bj\u0161\u00ed specifikac\u00ed. \u00dapln\u00e9 srovn\u00e1n\u00ed T651 vs. T6 a vs. T73 je v porovn\u00e1vac\u00ed tabulce n\u00ed\u017ee a alternativa zam\u011b\u0159en\u00e1 na korozi je pops\u00e1na v na\u0161em pr\u016fvodce vlastnostmi 7075-T73<\/a>.<\/p>\n\n\n\n

Mechanick\u00e9 vlastnosti 7075-T651<\/h2>\n\n\n\n
\"\"<\/figure>\n\n\n\n

7075-T651 je nejpevn\u011bj\u0161\u00ed b\u011b\u017en\u011b skladovan\u00fd temper hlin\u00edku \u2014 hodnoty n\u00ed\u017ee jsou typick\u00e9 pro desku, ty\u010d a blok.<\/p>\n\n\n\n

Majetek<\/th>Typick\u00e1 hodnota (7075-T651)<\/th><\/tr><\/thead>
Hustota<\/td>2,81 g\/cm\u00b3<\/td><\/tr>
Pevnost v tahu<\/td>~572 MPa (83 ksi)<\/td><\/tr>
Mez kluzu (0,2 % offset)<\/td>~503 MPa (73 ksi)<\/td><\/tr>
Ta\u017enost p\u0159i p\u0159etr\u017een\u00ed<\/td>11%<\/td><\/tr>
\u00danavov\u00e1 pevnost<\/td>~160 MPa<\/td><\/tr>
Tvrdost podle Brinella<\/td>~150 HB<\/td><\/tr>
Modul pru\u017enosti (Young\u016fv modul)<\/td>~71,7 GPa<\/td><\/tr>
Pevnost ve smyku<\/td>~331 MPa<\/td><\/tr>
Tepeln\u00e1 vodivost<\/td>~130 W\/m-K<\/td><\/tr>
Elektrick\u00e1 vodivost<\/td>~33 % IACS<\/td><\/tr>
Sou\u010dinitel tepeln\u00e9 rozta\u017enosti<\/td>23 \u00b5m\/m\u00b7K<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Mez kluzu ~503 MPa je hodnota, kter\u00e1 je nejd\u016fle\u017eit\u011bj\u0161\u00ed: p\u0159ibli\u017en\u011b 1,8\u00d7 mez kluzu 6061-T6 a asi o 55 % vy\u0161\u0161\u00ed ne\u017e 2024-T3, co\u017e je d\u016fvod, pro\u010d 7075 nahrazuje ocel v drakov\u00fdch konstrukc\u00edch a n\u00e1stroj\u00edch. Co tato pevnost stoj\u00ed, je chov\u00e1n\u00ed p\u0159i korozi a spojov\u00e1n\u00ed \u2014 7075 nen\u00ed sva\u0159iteln\u00fd taven\u00edm a vy\u017eaduje povrchovou ochranu v jak\u00e9mkoli vlhk\u00e9m nebo chloridov\u00e9m prost\u0159ed\u00ed. \u00danavov\u00e1 pevnost ~160 MPa st\u00e1le dob\u0159e podporuje cyklick\u00e9 zat\u00ed\u017een\u00ed, ale slitina je p\u0159ibli\u017en\u011b stejn\u011b tuh\u00e1 jako 6061 (modul ~71,7 GPa), tak\u017ee 7075 v\u00edt\u011bz\u00ed v pom\u011bru pevnosti k hmotnosti, nikoli v tuhosti. Pro celkov\u00fd obraz mezi slitinami viz n\u00e1\u0161 srovn\u00e1vac\u00ed pr\u016fvodce 6061 vs 7075<\/a>.<\/p>\n\n\n\n

Kde se 7075-T651 pou\u017e\u00edv\u00e1<\/h2>\n\n\n\n
\"\"<\/figure>\n\n\n\n

7075-T651 si vydob\u00fdv\u00e1 sv\u00e9 m\u00edsto v\u0161ude tam, kde o konstrukci rozhoduje vrcholov\u00e1 pevnost a t\u011bsn\u00e9 tolerance po obr\u00e1b\u011bn\u00ed a kde u\u017eivatel m\u016f\u017ee d\u00edl chr\u00e1nit p\u0159ed koroz\u00ed a spojovat jej mechanick\u00fdm upevn\u011bn\u00edm. Vlastn\u00ed vysoce zat\u00ed\u017een\u00fd, p\u0159esn\u011b obr\u00e1b\u011bn\u00fd konec sortimentu hlin\u00edku, kter\u00fd 6061 a 6063 p\u0159enech\u00e1vaj\u00ed v\u0161estrannosti a cen\u011b.<\/p>\n\n\n\n

Leteck\u00e9 a p\u0159esn\u011b obr\u00e1b\u011bn\u00e9 konstrukce<\/h3>\n\n\n\n

Nosn\u00edky k\u0159\u00eddel, r\u00e1my trupu, p\u0159ep\u00e1\u017eky, sou\u010d\u00e1sti podvozku a obroben\u00e9 spojovac\u00ed d\u00edly pou\u017e\u00edvaj\u00ed T651, proto\u017ee deska se odstran\u011bn\u00fdm pnut\u00edm udr\u017e\u00ed toleranci p\u0159i hlubok\u00e9m kapsov\u00e9m fr\u00e9zov\u00e1n\u00ed. V\u00fdrobci forem a n\u00e1stroj\u016f tak\u00e9 sahaj\u00ed po desce T651: obr\u00e1b\u00ed se do \u010dist\u00e9ho povrchu, le\u0161t\u00ed se pro kr\u00e1tkos\u00e9riov\u00e9 vst\u0159ikovac\u00ed nebo vyfukovac\u00ed formy a z\u016fst\u00e1v\u00e1 rozm\u011brov\u011b stabiln\u00ed po odebr\u00e1n\u00ed materi\u00e1lu. To jsou such\u00e1, chr\u00e1n\u011bn\u00e1 prost\u0159ed\u00ed kritick\u00e1 na pevnost \u2014 p\u0159esn\u011b tam, kde je vrcholov\u00e1 pevnost T651 spr\u00e1vn\u00fdm n\u00e1strojem a jeho citlivost na korozi je \u0159\u00edzena povlakem, nikoli volbou slitiny.<\/p>\n\n\n\n

Vysoce v\u00fdkonn\u00e1 automobilov\u00e1 technika, obrana a n\u00e1stroje<\/h3>\n\n\n\n

Z\u00e1vodn\u00ed ramena zav\u011b\u0161en\u00ed, desky podvozku, sk\u0159\u00edn\u011b p\u0159evodovek a r\u00e1my j\u00edzdn\u00edch kol pou\u017e\u00edvaj\u00ed T651 ke sn\u00ed\u017een\u00ed hmotnosti p\u0159i maxim\u00e1ln\u00edm zat\u00ed\u017een\u00ed. Obran\u00e9 a panc\u00e9\u0159ov\u00e9 aplikace vyu\u017e\u00edvaj\u00ed stejnou v\u00fdhodu pom\u011bru pevnosti k hmotnosti. Spole\u010dn\u00fdm poj\u00edtkem je d\u00edl, kter\u00fd je obr\u00e1b\u011bn, \u0161roubov\u00e1n nebo lepen \u2014 nikoli sva\u0159ov\u00e1n \u2014 a provozov\u00e1n ve vzduchu, nikoli v soln\u00e9 mlze. Vyhn\u011bte se T651 pro jakoukoli sou\u010d\u00e1st vystavenou trval\u00e9 vlhkosti, mo\u0159sk\u00e9mu prost\u0159ed\u00ed nebo chloridov\u00fdm prost\u0159ed\u00edm; pro ty p\u0159ejd\u011bte na p\u0159est\u00e1rnut\u00e9 tempery 7075-T73\/T7351<\/a> nebo jakost 5xxx\/6xxx.<\/p>\n\n\n\n

T651 vs. jin\u00e9 tempery 7075 \u2014 jak volit<\/h2>\n\n\n\n
\"\"<\/figure>\n\n\n\n

7075-T651 je mo\u017enost s vrcholovou pevnost\u00ed a odstran\u011bn\u00fdm pnut\u00edm; ostatn\u00ed tempery vym\u011b\u0148uj\u00ed pevnost za odolnost proti korozi 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>
T651<\/td>Rozpou\u0161t\u011bc\u00ed \u017e\u00edh\u00e1n\u00ed + ta\u017een\u00ed + st\u00e1rnut\u00ed<\/td>~572<\/td>~503<\/td>M\u00edrn\u00e1<\/td>P\u0159esn\u011b obr\u00e1b\u011bn\u00e1 deska, p\u0159\u00edpravky, konstrukce v such\u00e9m vzduchu<\/td>Vlhkost, mo\u0159sk\u00e9 prost\u0159ed\u00ed nebo expozice chlorid\u016fm<\/td><\/tr>
T6<\/td>Roztok + st\u00e1rnut\u00ed<\/td>~572<\/td>~503<\/td>M\u00edrn\u00e1<\/td>Obecn\u00e9 vysokopevnostn\u00ed, tenk\u00e9 pr\u016f\u0159ezy<\/td>Siln\u00e1 deska obr\u00e1b\u011bn\u00e1 v t\u011bsn\u00fdch toleranc\u00edch<\/td><\/tr>
T73 \/ 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>Vlhkost\/slan\u00e9 leteck\u00e9, mo\u0159sky p\u0159ilehl\u00e9 d\u00edly<\/td>Je po\u017eadov\u00e1na \u0161pi\u010dkov\u00e1 pevnost<\/td><\/tr>
T76 \/ T7651<\/td>Rozpou\u0161t\u011bc\u00ed \u017e\u00edh\u00e1n\u00ed + ta\u017een\u00ed + vyv\u00e1\u017een\u00e9 p\u0159est\u00e1rnut\u00ed<\/td>~510<\/td>~420<\/td>Dobr\u00fd<\/td>Polovystaven\u00e9 potahy, vyv\u00e1\u017een\u00e9 zat\u00ed\u017een\u00ed + koroze<\/td>Je vy\u017eadov\u00e1na maxim\u00e1ln\u00ed pevnost<\/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 T651 spr\u00e1vnou volbou<\/h3>\n\n\n\n

Zvolte T651, kdy\u017e je d\u00edl obr\u00e1b\u011bn ze siln\u00e9 desky nebo mus\u00ed udr\u017eet t\u011bsn\u00e9 tolerance po t\u011b\u017ek\u00e9m odb\u011bru materi\u00e1lu \u2014 krok ta\u017een\u00ed je to, co mu br\u00e1n\u00ed v deformaci. Zvolte T651, kdy\u017e d\u00edl \u017eije v such\u00e9m, chr\u00e1n\u011bn\u00e9m prost\u0159ed\u00ed kritick\u00e9m na pevnost (vnit\u0159n\u00ed konstrukce draku, n\u00e1stroje, z\u00e1vodn\u00ed komponenty), kde je koroze \u0159\u00edzena povlakem, nikoli substituc\u00ed slitiny.<\/p>\n\n\n\n

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

P\u0159ejd\u011bte na T73 nebo T7351, 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 \u2014 vym\u011bn\u00edte ~12\u201315 % meze kluzu za odolnost proti SCC, kter\u00e1 je o \u0159\u00e1dy lep\u0161\u00ed. S\u00e1hn\u011bte po T76\/T7651, kdy\u017e pot\u0159ebujete jak slu\u0161nou pevnost, tak zlep\u0161enou korozn\u00ed odolnost u polovystaven\u00fdch konstrukc\u00ed. Pro jak\u00fdkoli d\u00edl, kter\u00fd mus\u00ed b\u00fdt sva\u0159ov\u00e1n taven\u00edm nebo tvarov\u00e1n s t\u011bsn\u00fdmi polom\u011bry, opus\u0165te 7075 zcela: 6061-T6 se sva\u0159uje a tvaruje 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-T651 \u2014 co pot\u0159ebujete v\u011bd\u011bt<\/h2>\n\n\n\n
    \n
  • Obr\u00e1b\u011bn\u00ed.<\/strong> T651 se vynikaj\u00edc\u00edm zp\u016fsobem obr\u00e1b\u00ed \u2014 \u0159e\u017ee se p\u0159i vysok\u00e9 rychlosti, tvo\u0159\u00ed kr\u00e1tk\u00e9 lomen\u00e9 t\u0159\u00edsky a udr\u017euje toleranci, proto\u017ee krok ta\u017een\u00ed ji\u017e odstranil zbytkov\u00e9 pnut\u00ed. To je d\u016fvod, pro\u010d je 7075 obl\u00edben\u00fd pro CNC desky a pr\u00e1ci s formami; pou\u017e\u00edvejte ostr\u00e9 karbidov\u00e9 n\u00e1stroje a dobr\u00fd pr\u016ftok chladic\u00ed kapaliny a o\u010dek\u00e1vejte lep\u0161\u00ed povrch ne\u017e u 6061 p\u0159i vy\u0161\u0161\u00edch posuvech.<\/li>\n\n\n\n
  • Sva\u0159ov\u00e1n\u00ed.<\/strong> 7075 se nedoporu\u010duje pro sva\u0159ov\u00e1n\u00ed taven\u00edm \u2014 obloukov\u00e9 procesy zp\u016fsobuj\u00ed hork\u00e9 prask\u00e1n\u00ed, zm\u011bk\u010duj\u00ed tepeln\u011b ovlivn\u011bnou z\u00f3nu o 40\u201350 % a zanech\u00e1vaj\u00ed zbytkov\u00e9 pnut\u00ed, kter\u00e9 zve k korozn\u00edmu prask\u00e1n\u00ed za nap\u011bt\u00ed v provozu. Pro konstruk\u010dn\u00ed spoje navrhujte n\u00fdtov\u00e1n\u00ed, \u0161roubov\u00e1n\u00ed nebo lepen\u00ed; kde je sva\u0159ov\u00e1n\u00ed nevyhnuteln\u00e9, sva\u0159ov\u00e1n\u00ed t\u0159en\u00edm s prom\u00edch\u00e1v\u00e1n\u00edm (FSW) zachov\u00e1v\u00e1 p\u0159es 90 % pevnosti z\u00e1kladn\u00edho materi\u00e1lu, ale tavn\u00e1 oprava nosn\u00e9 dr\u00e1hy 7075 by se nem\u011bla vr\u00e1tit do provozu.<\/li>\n\n\n\n
  • Protikorozn\u00ed ochrana.<\/strong> T651 m\u00e1 pouze m\u00edrnou odolnost proti korozi a je citliv\u00fd na SCC ve stavu s vrcholov\u00fdm st\u00e1rnut\u00edm, proto chra\u0148te exponovan\u00e9 povrchy: anodizace (Typ II nebo III), chrom\u00e1tov\u00fd konverzn\u00ed povlak (Alodine), pl\u00e1tov\u00e1n\u00ed nebo n\u00e1t\u011br. Pro cokoli v mo\u0159sk\u00e9m nebo chloridov\u00e9m provozu specifikujte T73\/T7351 nam\u00edsto spol\u00e9h\u00e1n\u00ed se pouze na povlak.<\/li>\n\n\n\n
  • Tv\u00e1\u0159itelnost.<\/strong> T651 m\u00e1 \u0161patnou tva\u0159itelnost a prask\u00e1 p\u0159i ohybech s t\u011bsn\u00fdm polom\u011brem; pou\u017e\u00edvejte velk\u00e9 polom\u011bry ohybu a po\u010d\u00edtejte s odpru\u017een\u00edm. Skute\u010dn\u00e9 tv\u00e1\u0159en\u00ed pat\u0159\u00ed do temperu O, p\u0159i\u010dem\u017e d\u00edl je po tvarov\u00e1n\u00ed tepeln\u011b zpracov\u00e1n na T6 nebo T73 \u2014 neo\u010dek\u00e1vejte, \u017ee budete tvarovat T651 p\u0159\u00edmo.<\/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>Nejvy\u0161\u0161\u00ed ze v\u0161ech b\u011b\u017en\u00fdch hlin\u00edk\u016f (~503 MPa mez kluzu)<\/td>Cena v\u00fdrazn\u011b nad jakostmi 6xxx<\/td><\/tr>
    Stabilita p\u0159i obr\u00e1b\u011bn\u00ed<\/td>T651 s odstran\u011bn\u00fdm pnut\u00edm, z\u016fst\u00e1v\u00e1 ploch\u00fd po CNC<\/td>T651 nese pr\u00e9mii za ta\u017een\u00ed\/zpracov\u00e1n\u00ed oproti T6<\/td><\/tr>
    \u00danava<\/td>~160 MPa podporuje cyklick\u00e9 leteck\u00e9 zat\u00ed\u017een\u00ed<\/td>Riziko SCC p\u0159i nam\u00e1h\u00e1n\u00ed v korozivn\u00edch prost\u0159ed\u00edch<\/td><\/tr>
    Koroze<\/td>Zvl\u00e1dnuteln\u00e9 povlakem v such\u00e9m provozu<\/td>V nejlep\u0161\u00edm p\u0159\u00edpad\u011b m\u00edrn\u00e1; vy\u017eaduje ochranu, na rozd\u00edl od 5xxx\/6xxx<\/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>Skladov\u00e1no jako deska, ty\u010d a blok<\/td>Tenkost\u011bnn\u00e9 a speci\u00e1ln\u00ed profily m\u00e9n\u011b b\u011b\u017en\u00e9<\/td><\/tr>
    Odolnost proti SCC<\/td>Dobr\u00fd v T651 pro such\u00e9, chr\u00e1n\u011bn\u00e9 d\u00edly<\/td>Tempery s vrcholov\u00fdm st\u00e1rnut\u00edm pot\u0159ebuj\u00ed T73\/T7351 ve vlhk\u00e9m provozu<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

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

    Kompromis je jasn\u00fd: 7075-T651 nab\u00edz\u00ed nejvy\u0161\u0161\u00ed pevnost, jakou m\u016f\u017ee jak\u00fdkoli b\u011b\u017en\u00fd hlin\u00edk poskytnout, plus obr\u00e1b\u011bc\u00ed stabilitu, kter\u00e1 udr\u017euje p\u0159esn\u00e9 d\u00edly v toleranci \u2014 ale vy\u017eaduje ochranu proti korozi a spojov\u00e1n\u00ed mechanick\u00fdmi spoji (ne sva\u0159ov\u00e1n\u00edm) a je nespr\u00e1vnou volbou v jak\u00e9mkoli vlhk\u00e9m prost\u0159ed\u00ed nebo prost\u0159ed\u00ed s chloridy. Zvolte jej, kdy\u017e je d\u00edl obr\u00e1b\u011bn\u00fd, kritick\u00fd z hlediska zat\u00ed\u017een\u00ed a chr\u00e1n\u011bn\u00fd; zvolte T73\/T7351, kdy\u017e je ve h\u0159e koroze, a 6061, kdy\u017e o konstrukci rozhoduje sva\u0159ov\u00e1n\u00ed nebo tv\u00e1\u0159en\u00ed.<\/p>\n\n\n\n

    Na adrese Hlin\u00edk Linsy<\/strong>, Skladujeme 7075-T651 v desk\u00e1ch, ty\u010d\u00edch, bloc\u00edch a trubk\u00e1ch, p\u0159i\u010dem\u017e dal\u0161\u00ed tvary kalen\u00ed 7075 (T6, T73\/T7351) jsou dostupn\u00e9 v r\u016fzn\u00fdch form\u00e1tech. Ka\u017ed\u00e1 objedn\u00e1vka je dod\u00e1v\u00e1na s hutn\u00edm atestem (Mill Test Certificate) a na vy\u017e\u00e1d\u00e1n\u00ed jsou k dispozici zpr\u00e1vy SGS o slo\u017een\u00ed, mechanick\u00fdch vlastnostech a ultrazvukov\u00e9 kontrole (tlust\u00e9 desky). N\u00e1\u0161 t\u00fdm posoud\u00ed v\u00e1\u0161 v\u00fdkres, doporu\u010d\u00ed spr\u00e1vn\u00e9 kalen\u00ed a rozm\u011br a upozorn\u00ed na riziko SCC d\u0159\u00edve, ne\u017e zbyte\u010dn\u011b p\u0159edimenzujete specifikaci. 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-T651 pevn\u011bj\u0161\u00ed ne\u017e 7075-T6?<\/h3>\n\n\n\n

    V podstat\u011b stejn\u00e9. Ob\u011b dosahuj\u00ed pevnosti v tahu ~572 MPa a meze kluzu ~503 MPa; prota\u017een\u00ed u T651 prob\u00edh\u00e1 p\u0159ed st\u00e1rnut\u00edm a nem\u011bn\u00ed kone\u010dnou pevnost. Skute\u010dn\u00fd rozd\u00edl je ve zbytkov\u00e9m nap\u011bt\u00ed \u2014 T651 z\u016fst\u00e1v\u00e1 rozm\u011brov\u011b stabiln\u00ed p\u0159i t\u011b\u017ek\u00e9m obr\u00e1b\u011bn\u00ed, zat\u00edmco T6 se m\u016f\u017ee deformovat p\u0159i uvol\u0148ov\u00e1n\u00ed nap\u011bt\u00ed, tak\u017ee T651 je specifikac\u00ed pro p\u0159esn\u011b obr\u00e1b\u011bn\u00e9 desky.<\/p>\n\n\n\n

    Lze slitinu 7075-T651 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

    M\u00e1m zvolit T651 nebo T73?<\/h3>\n\n\n\n

    Zvolte T651 pro such\u00e9, chr\u00e1n\u011bn\u00e9 d\u00edly kritick\u00e9 z hlediska pevnosti, kde je koroze \u0159\u00edzena povlakem. Zvolte T73 nebo T7351, kdy\u017e je d\u00edl vystaven trval\u00e9 vlhkosti, soln\u00e9 mlze nebo chlorid\u016fm \u2014 vzd\u00e1te se ~12\u201315% meze kluzu v\u00fdm\u011bnou za odolnost proti SCC, kter\u00e1 je o \u0159\u00e1dy lep\u0161\u00ed, co\u017e je d\u016fvod, pro\u010d leteck\u00e9 vn\u011bj\u0161\u00ed d\u00edly a d\u00edly v bl\u00edzkosti mo\u0159sk\u00e9ho prost\u0159ed\u00ed specifikuj\u00ed p\u0159est\u00e1rnut\u00e1 kalen\u00ed.<\/p>\n\n\n\n

    Je 7075-T651 vhodn\u00fd pro mo\u0159sk\u00e9 nebo venkovn\u00ed pou\u017eit\u00ed?<\/h3>\n\n\n\n

    Pouze se silnou ochranou, a i tak je T651 \u0161patnou v\u00fdchoz\u00ed volbou pro mo\u0159sk\u00e9 prost\u0159ed\u00ed, proto\u017ee 7075 v maxim\u00e1ln\u011b vytvrzen\u00e9m stavu je citliv\u00fd na SCC v chloridov\u00e9m prost\u0159ed\u00ed. Pro skute\u010dn\u00e9 mo\u0159sk\u00e9 nebo pob\u0159e\u017en\u00ed expozice specifikujte T73\/T7351 nebo p\u0159ejd\u011bte na t\u0159\u00eddu 5xxx; T651 pat\u0159\u00ed do such\u00fdch, povlakovan\u00fdch aplikac\u00ed, vnit\u0159n\u00edch \u010d\u00e1st\u00ed drak\u016f letadel nebo n\u00e1stroj\u016f.<\/p>\n\n\n\n

    M\u00e1 Linsy na sklad\u011b 7075-T651 a jak\u00e1 je dodac\u00ed lh\u016fta?<\/h3>\n\n\n\n

    Ano. Skladov\u00e9 desky, ty\u010de, bloky a trubky se expeduj\u00ed ze skladu; nestandardn\u00ed rozm\u011bry a kalen\u00ed 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\u011b dostupn\u00fdmi polo\u017ekami jen z\u0159\u00eddka zablokuj\u00ed projekt.<\/p>","protected":false},"excerpt":{"rendered":"

    7075-T651 is the peak-strength, stress-relieved temper of 7075 \u2014 the aluminum grade engineers reach for when the part must carry steel-like load at a fraction of the weight. This guide covers what the T651 designation means, the real numbers, how it compares to T6 and the corrosion-resistant tempers, and where its strength pays off \u2014 […]<\/p>\n","protected":false},"author":3,"featured_media":10516,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"7075-T651 Aluminum Alloy: Properties, T6 Comparison & Uses","_seopress_titles_desc":"Complete guide to 7075-T651 aluminum: mechanical properties, T651 vs T6 differences, stress-relief process, aerospace and automotive applications, machining and joining tips.","_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":[],"tags":[],"class_list":["post-6813","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/posts\/6813","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=6813"}],"version-history":[{"count":2,"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/posts\/6813\/revisions"}],"predecessor-version":[{"id":10522,"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/posts\/6813\/revisions\/10522"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/media\/10516"}],"wp:attachment":[{"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/media?parent=6813"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/categories?post=6813"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/premiumalu.com\/cs\/wp-json\/wp\/v2\/tags?post=6813"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}