原始组织对TA15钛合金α+β相区塑性流动行为的影响  

Effects of Original Structure on Plastic Flow of TA15 Titanium Alloy in Alpha and Beta Phase Field

作　　者：马小涵[1] 董显娟[1] 徐勇[2] 连鑫[1] 彭文涛[1] 

机构地区：[1]南昌航空大学航空制造工程学院 [2]南昌航空大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2013年第9期868-871,共4页Special Casting & Nonferrous Alloys

基　　金：江西省自然科学基金资助项目(20122BAB216015);江西省教育厅青年科学基金资助项目(GJJ11160);南昌航空大学博士启动基金资助项目(EA201103316)

摘　　要：采用THERMECMASTOR-Z型热加工模拟试验机对魏氏和网篮组织两种TA15钛合金在α＋β两相区温度750～950℃、应变速率为0.001～10s^-1范围进行等温恒应变速率压缩试验，研究了原始组织对合金塑性流动行为的影响。结果表明，两种片状组织TA15钛合金的真应力一真应变曲线均呈“应变软化”型，变形温度越低、应变速率越高，流动软化程度越大，流动软化主要是片状α相的等轴化引起的。热变形参数相同时，网篮组织TA15钛合金对应的流动软化程度更大，这与两种组织热变形激活能不同造成α相的等轴化百分比不同有关。The isothermal constant strain rate compression tests of TA15 titanium alloy with Widmanstatten and basketweave microstructure were carried out by THERMECMASTOR-Z hot working simulator testing machine in the range of 750℃～950℃ and strain rate range of 0.001 s^-1～10s^-1 in alpha and beta phase Zone. Effect of original structure on plastic flow behavior were appraoched. The results indicate that the stress-strain curves of TA15 titanium alloy are characterized by strain-softening types. The flow softening resulted from the spheroidization of lamellar alpha phase is increased with decreasing in deformation temperature and increasing in strain rate. The degree of flow softening of basketweave microstructure is greater than that of Widmanstatten microstructure at the same hot deformation parameter, which is attributed to the different spheroidization percentage of alpha phase caused by different hot deformation activation energy.

关 键 词：TA15钛合金 片状组织 流动软化 变形激活能 等轴化 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG115.21[金属学及工艺—金属材料]