Dab tsi yog 7075 Aluminium Alloy yog
7075 yog lub tshav kub- kho tau Al-Zn-Mg-Cu alloy tsim rau cov qauv hauv dav hlau qhov twg lub zog, qhov hnyav thiab kev ntseeg tau raug txiav txim siab ua ke. Zinc yog lub ntsiab alloying, kev txhawb nqa los ntawm magnesium thiab tooj liab, thiab kev sib xyaw ua ke yog dab tsi cais 7075 los ntawm cov khoom siv dav hlau xws li 5052 lossis 6061.
Cov hlau yog muab los ua ntawv, phaj, extruded bar thiab forging Tshuag. Phaj yog ib txwm dov thiab tom qab ntawd kev ntxhov siab-txuag, thaum bar thiab extrusion ua raws li lawv tus kheej txoj kev npau taws. Qhov ceev yog li ntawm 2.81 g / cm³, kwv yees li ib feem peb ntawm cov hlau, thiab qhov sib piv yog vim li cas cov hlau raug xaiv txawm tias qhov muaj zog tsis yog tib qho kev ntsuas.
Yog vim li cas lub zog mus txog Steel
Lub zog siab ntawm 7075 los ntawm nag lossis daus hardening, tsis yog los ntawm alloying ib leeg. Tom qab cov kev kho cua sov kho cov hlau yog quenched los tuav zinc, magnesium thiab tooj liab nyob rau hauv supersaturated solid tov, ces artificially aged kom zoo intermetallic precipitates, chiefly MgZn₂, tsim nyob rau hauv lub txhuas matrix.
Cov precipitates block dislocation txav, thiab dislocation txav yog lub ntsiab mechanism ntawm yas deformation nyob rau hauv hlau. Thaiv nws tsa ob qho kev ntxhov siab xav tau los pib tawm thiab qhov kev ntxhov siab xav tau los txuas ntxiv deformation, uas yog raws nraim li cov qauv hlau yuav tsum ua.
| Khoom, 7075-T6 | Yam nqi |
|---|---|
| Lub zog tensile | 540-570 MPa |
| Yield zog | 480-500 MPa |
| Elongation | 5-11% nyob ntawm daim ntawv khoom |
| Qhov ntom | 2.81 g / cm³ |
| Modulus ntawm elasticity | 71.7 gvp |
| Hom qauv steel rau kev sib piv | 400-550 MPa tensile, ceev 7.85 g / cm³ |
Lub zog ntawm lub siab - lub zog hlau tseem tuaj yeem siab dua, tab sis lub zog tshwj xeeb yog qhov twg 7075 yeej. Tawm tsam ib tug 400 MPa steel alloy muab piv load peev xwm ntawm kwv yees li ib feem peb ntawm qhov hnyav, uas yog vim li cas nws dominates tis daim tawv nqaij, tav, spars, tsaws - iav Cheebtsam thiab siab - load tooling daim hlau.
T6 thiab T651: Dab tsi ntxiv Stretching Kauj Ruam Ua
Qhov sib txawv ntawm 7075-T6 thiab 7075-T651 tsis yog tshuaj lom neeg muaj pes tsawg leeg tab sis tswj kev ntxhov siab thaum kho cua sov.
T6: kev kho cua sov kho, quenched thiab artificially hnub nyoog.
T651: tib T6 ntu ua raws li kev tswj kev ncab ntawm 1-3% txhawm rau txo qis kev ntxhov siab.
Cov kauj ruam ncab ua rau txo qis cov kev ntxhov siab seem, uas ua rau muaj kev ruaj ntseg zoo dua, tsis muaj zog thaum lub tshuab ua haujlwm thiab txhim kho kev qaug zog thiab kev ntxhov siab corrosion. Rau cov phaj tuab, sib sib zog nqus hnab tshos thiab nruj- qhov ntev, T651 yog qhov kev nyab xeeb dua; T6 tseem tsim nyog qhov twg tus nqi thiab lub zog siab tshaj plaws tswj hwm thiab machining distortion tsis tseem ceeb.
Kev xav txog kev tsim qauv dhau lub zog
Kev nyuaj siab corrosion cracking: 7075-T6 yog rhiab heev nyob rau hauv lub luv-transverse kev taw qhia, yog li cov seem tuab raug rau cov loads ruaj khov feem ntau teev nyob rau hauv T73 los yog T7351 overaged tempers.
Vuam: fusion vuam ntawm 7075 tsis pom zoo rau cov qauv pob qij txha vim tias nws degrades cov nag lossis daus -hardened microstructure; mechanical fastening thiab adhesive bonding yog nyiam.
Machining: ntse tooling, dav nti clearance thiab kev ntxhov siab-relieved Tshuag khaws distortion kwv yees.
Kev tiv thaiv corrosion: liab qab alloy ua tau zoo nyob rau hauv huab cua tab sis tau txais txiaj ntsig los ntawm anodising lossis txheej tiv thaiv nyob rau hauv ib puag ncig hnyav.
Specification: daim ntawv thiab phaj rau ASTM B209, extruded khoom rau ASTM B221, nrog kev kho cua sov tswj rau AMS 2772.
Nyeem ua ke, lub alloy yog qhov zoo tshaj plaws to taub raws li ib tug engineered system: kev kho cua sov ua rau lub zog, lub stretching kauj ruam tiv thaiv lub geometry, thiab temper xaiv txiav txim seb qhov sib npaug ntawm ob qho tib si rau ib feem.
Cov lus nug nquag
Q: Puas yog 7075 txhuas muaj zog dua hlau?
Nws yog piv rau ntau yam steels nyob rau hauv tensile lub zog ntawm 540-570 MPa, thiab deb zog nyob rau hauv ib chav tsev ntawm qhov hnyav vim hais tias nws qhov ceev tsuas yog ib feem peb ntawm cov hlau.
Q: Vim li cas 7075 muaj zog dua 6061?
7075 yog hardened los ntawm zinc, magnesium thiab tooj liab precipitates, feem ntau yog MgZn₂, uas thaiv kev txav txav deb tshaj li cov magnesium -silicide precipitates uas ntxiv dag zog rau 6061.
Q: Qhov txawv ntawm 7075-T6 thiab 7075-T651 yog dab tsi?
T651 ntxiv qhov tswj tau 1-3% ncab tom qab T6 sib lawv liag kom txo tau cov kev ntxhov siab uas seem. Geometry nyob ruaj khov dua thaum lub sij hawm machining thiab qaug zog tus cwj pwm txhim kho.
Q: Puas tuaj yeem 7075 aluminium welded?
Fusion vuam tsis pom zoo rau cov pob qij txha. Cov cua sov ua rau cov nag lossis daus- cov qauv tawv tawv hauv thaj chaw vuam, yog li siv cov khoom siv sib txuas thiab kev sib txuas.
Q: Puas yog 7075 aluminium corrode?
Bare alloy resists atmospheric corrosion zoo. Nws yog rhiab heev rau kev ntxhov siab corrosion tawg nyob rau hauv luv luv -transverse kev taw qhia, yog li T73 los yog T7351 tempers yog teev rau loaded tuab seem.
Q: Dab tsi yog 7075 txhuas siv rau?
Aerospace tis daim tawv nqaij, tav, spars thiab fittings, siab -load tooling thiab pwm daim hlau, thauj cov qauv thiab txhua daim ntawv thov qhov twg lub zog rau ib chav tsev qhov hnyav txiav txim qhov tsim.
