固溶处理对7075铝合金组织和力学性能的影响

发布时间：2019-03-11 14:43

【摘要】：采用金相显微镜、SEM及能谱分析、万能拉伸试验机和显微硬度计等手段,研究了固溶温度和固溶时间对7075铝合金组织及力学性能的影响。结果表明,随固溶温度(450~490℃)的升高和固溶时间(20~120min)的延长,组织中粗大第二相以AlZnMgCuFe相和Si-O相为主,且数量和尺寸均逐渐减少;合金的抗拉强度、屈服强度、伸长率和显微硬度均呈现先增大后减小的趋势。固溶温度过低或时间太短均会导致固溶不充分;固溶温度过高或时间过长,晶粒不仅产生长大现象,甚至可能发生过烧。7075铝合金的固溶处理工艺为(470±5)℃×60min时,抗拉强度、屈服强度、伸长率和显微硬度(HV)分别达到635 MPa、560 MPa、13.5%和205.6,综合性能较好。
[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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