【摘要】：采用Gleeble-1500對(duì)ZK60合金進(jìn)行鍛造模擬,分析了合金高應(yīng)變速率可鍛性;并采用空氣錘對(duì)合金成功地進(jìn)行高應(yīng)變速率多向鍛造,研究了其組織演變和力學(xué)性能。結(jié)果表明:高應(yīng)變速率(≥10 s-1)鍛造成形時(shí),孿生和動(dòng)態(tài)再結(jié)晶對(duì)變形儲(chǔ)能的消耗以及變形溫升對(duì)散熱造成的塑性下降的彌補(bǔ),可防止合金在高應(yīng)變速率鍛造時(shí)產(chǎn)生裂紋。此外,由于再結(jié)晶同時(shí)在晶界和孿晶上產(chǎn)生,獲得了比低應(yīng)變速率鍛造成形更為均勻的再結(jié)晶組織,因此高應(yīng)變速率鍛造成形是一種高效可行的鎂合金塑性加工工藝。經(jīng)高應(yīng)變速率多向鍛造成形后,可形成殼狀粗晶和核狀細(xì)晶構(gòu)成的雙峰晶粒組織,應(yīng)變∑Δε=2.64時(shí),粗晶和細(xì)晶組織的平均晶粒尺寸分別為10μm和1μm。由于雙峰晶粒組織的形成,合金表現(xiàn)出良好的綜合力學(xué)性能,抗拉強(qiáng)度和延伸率分別達(dá)到330.2 MPa、24.8%,表明高應(yīng)變速率多向鍛造成形是制備高性能鎂合金的有效途徑。
[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，

本文編號(hào)：2161663