Q1: Dab tsi yog cov khoom tseem ceeb ntawm cov khoom sib txawv ntawm 2024, 6061 ,, 7075 txhuas alloys rau cov dav hlau ua haujlwm?
A1:
Peb lub alloy nthuav qhia cov yam ntxwv sib txawv:
2024-T3: Tawm lub zog 345 MPa, qaug zog lub neej 10⁷ mus txog ntawm 120 MPa (faa ac {{3} b)
6061-T6: QUAT LUB ZOG (276 MPA tawm tswv yim) tab sis Superior corrosion Kuj (Astm G67 Loj Poob<15 mg/cm²)
7075-T6: Lub zog ncov (503 mpa kom meej) tab sis raug rau kev ntxhov siab corrosion (SCC)
Boeing 787 siv 2024 rau cov tawv nqaij tawv ncauj ({mm thickness) vim tias nws cov neeg qaug zog tickness) vim tias nws cov neeg nkees tawm tsam qhov twg lub zog outweighs SCC kev txhawj xeeb. 6061 tshwm sim nyob rau hauv tsis yog-tseem ceeb cheebtsam zoo li sab hauv vaj huam sib luag.
Q2: Yuav ua li cas thiaj li aerospace aluminium alloys sib piv hauv kev ua phem thiab tus nqi tshaj tawm?
A2:
Kev nkees nkees txoj kev loj hlob (FCG) Kev kuaj ib astm E647 qhia:
2024-T3: Ntaj \/ dn=2 × 10⁻⁴ mm \/ kev voj voog ntawm δk {2}} mpaology (zoo tshaj plaws ntawm allots)
7075-T73: Txhim Kho Scc Kuj Tab sis 40% Sai FCG ntau dua 2024
2524-T3(Tshiab variant): 25% qeeb qeeb FCG tshaj tus qauv 2024
Airbus A350 ntiav 2524 rau cov tawv nqaij qis, ua tiav 90 3}} ya davhlau veycles ua ntej 60, {kycles nrog tsoos 2024.
Q3: Muaj dab tsi advanced aluminium alleizs yog hloov cov phiaj xwm Aerospace?
A3:
Thib peb-li alloys muaj:
2099-T83: 5% kev txo qis txo, 12% nruj zog ntxiv (siv hauv f {2}}} bulkheads)
2195: 30% muaj zog dua 2219 ntawm Cryo Temps (chaw nyab tab thiab kev hloov pauv)
2050-T84: Sib koom ua ke 2024 lub neej qaug zog nrog 7075 lub zog
NASA's SLS Cov Ntsiab Tseem Ceeb Siv 1,200 M² ntawm 2195 cov paib, txuag 7,700 {}} degree rau 175 degree ua haujlwm.
Q4: Yuav ua li cas Thermal conductivity txawv txav ntawm aerospace aluminium alloys thiab kev cuam tshuam cov cua sov tiv thaiv cov tshuab?
A4:
Condesity Ranges (25 degree, Astm E1461):
Ntshiab Al (1050): 229 W/m·K
2024: 151 W/m·K
7075: 130 W/m·K
Hypersonic cov tsheb zoo li sr -72}}}}} · k cong 2219 (188 W \/Th-High High High High High High Hights-} (-· k) Thermal finite elate tsom qhia pom 35% tshav kub zoo dua li monolithic tsim.
Q5: Yuav ua li cas tawm cov kev kho cov kev kho cov kev txhim kho sab laj txhim kho corrosion tsis muaj kev ua kom qaug zog ua haujlwm?
A5:
Peb lub tshuab tawg thev naus laus zis:
Ntshav hluav taws xob elecma electrolytic oxidation (PEO): 50μm ci ci tiv taus withstand 3, {2}}} hrs ntsev tsuag (Astm B117)
Cov tshuaj tsuag txias al-Ce alloys: Kho thaj ua rau thaj nrog 95% cov hlau ua haujlwm
Nanostructured anodizing: Ntaus cov tsho tiv thaiv iib txo qis kev ua kom lub zog qaug zog los ntawm 20% rau<5%
Lockheed Martin's F -35}} ion vapor tso (IVD) txhuas ntawm 70} -83488 kuaj.
