【摘要】：采用金相顯微鏡、SEM及能譜分析、萬能拉伸試驗機和顯微硬度計等手段,研究了固溶溫度和固溶時間對7075鋁合金組織及力學(xué)性能的影響。結(jié)果表明,隨固溶溫度(450~490℃)的升高和固溶時間(20~120min)的延長,組織中粗大第二相以AlZnMgCuFe相和Si-O相為主,且數(shù)量和尺寸均逐漸減少;合金的抗拉強度、屈服強度、伸長率和顯微硬度均呈現(xiàn)先增大后減小的趨勢。固溶溫度過低或時間太短均會導(dǎo)致固溶不充分;固溶溫度過高或時間過長,晶粒不僅產(chǎn)生長大現(xiàn)象,甚至可能發(fā)生過燒。7075鋁合金的固溶處理工藝為(470±5)℃×60min時,抗拉強度、屈服強度、伸長率和顯微硬度(HV)分別達到635 MPa、560 MPa、13.5%和205.6,綜合性能較好。
[Abstract]:The effects of solution temperature and time on microstructure and mechanical properties of 7075 aluminum alloy were studied by means of metalloscope, SEM and energy spectrum analysis, universal tensile testing machine and microhardness tester. The results showed that with the increase of solution temperature (450 鈩，

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