置氢处理对铸态TiZrAlV合金高温变形行为及显微组织的影响  

Effect of Hydrogenated Treatment on High-Temperature Deformation Behavior and Microstructure of As-cast TiZrAlV Alloy

作　　者：唐敏 陈莉君 王轩 栾佰峰[1] 刘庆[1] Tang Min;Chen Lijun;Wang Xuan;Luan Baifeng;Liu Qing(Chongqing Key Laboratory for Light Metals,International Joint Laboratory for Light Alloys,Ministry of Education,College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学材料科学与工程学院教育部轻合金材料国际联合实验室轻金属科学与技术重庆市重点实验室,重庆400044

出　　处：《稀有金属材料与工程》2021年第2期568-574,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51531005,51421001,51901029)。

摘　　要：为了探究置氢处理对45Ti-47Zr-5Al-3V合金高温变形行为及显微组织的影响,利用动态热模拟试验机,对置氢与未置氢的铸态合金在不同变形条件下进行热压缩,并构建了本构方程及热加工图。结果表明,加入适量的氢可以显著降低TiZrAlV合金的流变应力和变形激活能,计算得到未置氢合金热压缩变形激活能为339.7 kJ/mol,而置氢后的激活能为286.5 kJ/mol,适宜的加工参数为650~900℃,0.01~1 s^(-1)。OM和EBSD微观组织观察表明,置氢能细化铸态组织,增加β相含量,促进动态再结晶,从而显著降低了合金的流变抗力,扩大了热加工窗口,提高了热加工性能。In order to study the influence of hydrogenation on the high temperature deformation behavior and microstructure evolution of 45 Ti-47 Zr-5 Al-3 V alloy, a dynamic thermal simulation machine was used to hot compress the as-cast alloy with and without hydrogenation under different deformation conditions. The constitutive equation and hot working maps of the TiZrAlV alloy were established. The results show that the flow stress and deformation activation energy of TiZrAlV alloy can be significantly reduced by adding proper amount of hydrogen. The activation energy of unhydrogenated and hydrogenated alloy is 339.7 and 286.5 kJ/mol, respectively. Meanwhile, the optimum thermal processing parameters are 700~900 ℃, 0.01~1 s^(-1). The OM and EBSD microstructure observations show that adding hydrogen can refine the as-cast structure, increase the β-phase content and promote dynamic recrystallization, thus significantly reducing the flow resistance of the alloy, expanding the hot processing window and improving the thermal processing performance.

关 键 词：置氢 TiZrAlV合金 本构方程 动态再结晶 

分 类 号：TG146.23[一般工业技术—材料科学与工程]