ZK60镁合金高应变速率锻造成形

发布时间：2018-08-03 11:54

【摘要】：采用Gleeble-1500对ZK60合金进行锻造模拟,分析了合金高应变速率可锻性;并采用空气锤对合金成功地进行高应变速率多向锻造,研究了其组织演变和力学性能。结果表明:高应变速率(≥10 s-1)锻造成形时,孪生和动态再结晶对变形储能的消耗以及变形温升对散热造成的塑性下降的弥补,可防止合金在高应变速率锻造时产生裂纹。此外,由于再结晶同时在晶界和孪晶上产生,获得了比低应变速率锻造成形更为均匀的再结晶组织,因此高应变速率锻造成形是一种高效可行的镁合金塑性加工工艺。经高应变速率多向锻造成形后,可形成壳状粗晶和核状细晶构成的双峰晶粒组织,应变∑Δε=2.64时,粗晶和细晶组织的平均晶粒尺寸分别为10μm和1μm。由于双峰晶粒组织的形成,合金表现出良好的综合力学性能,抗拉强度和延伸率分别达到330.2 MPa、24.8%,表明高应变速率多向锻造成形是制备高性能镁合金的有效途径。
[Abstract]:The forging simulation of ZK60 alloy was carried out by Gleeble-1500, the high strain rate forgability of the alloy was analyzed, and the microstructure evolution and mechanical properties of the alloy were studied by using air hammer to successfully carry out high strain rate multidirectional forging. The results show that during high strain rate (鈮，

本文编号：2161663