热轧温度对Ti-Zr-V-Nb-Si合金微观组织和力学性能的影响  

Effect of Hot Rolling Temperature on Microstructure and Mechanical Properties of Ti-Zr-V-Nb-Si Alloy

作　　者：刘娅 张朝晖[1,2] 何杨宇 贾晓彤 王强 冯向向 程兴旺[1,2] LIU Ya;ZHANG Zhaohui;HE Yangyu;JIA Xiaotong;WANG Qiang;FENG Xiangxiang;CHENG Xingwang(School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China;Tangshan Key Laboratory of High-Performance Metals and Ceramics,Tangshan Research Institute BIT,Tangshan 063000,China)

机构地区：[1]北京理工大学材料学院,北京100081 [2]北京理工大学,唐山研究院唐山市特种金属与陶瓷材料重点实验室,唐山063000

出　　处：《真空科学与技术学报》2024年第10期863-870,共8页Chinese Journal of Vacuum Science and Technology

摘　　要：采用真空电弧熔炼制备了密度仅为6.1 g/cm^(3)的(TiZrV_(0.5)Nb_(0.5))_(99.4)Si_(0.6)轻质高熵合金,并分别选取900℃、1000℃和1100℃的热轧温度对合金进行轧制改性处理,探究了不同热轧温度对微观组织与力学性能的影响。结果表明:真空电弧熔炼制备的合金经轧制后强度和延伸率均得到提高,在900℃下热轧的合金具有的1164.5 MPa的拉伸断裂强度以及14.7%的延伸率,性能提升最佳,较铸态合金分别提高了13.9%和950%。随着热轧温度的进一步升高,合金平均晶粒尺寸变大、力学性能不断下降。900℃下热轧后合金优异的综合力学性能是位错增殖、固溶强化、第二相强化和晶粒细化四种强化机制共同作用的结果。Light weight high entropy alloy(TiZrV_(0.5)Nb_(0.5))_(99.4)Si_(0.6)with a density of 6.1 g/cm^(3)was prepared by vacuum arc melting.The effects of different hot-rolling temperatures(900℃,1000℃and 1100℃)on the microstructure and mechanical properties were investigated.The results show that after rolling,the strength and elongation are both improved.The tensile strength and elongation of the alloy with a rolling temperature of 900℃reached 1164.5 MPa and 14.7%,which was best and can surpass 13.9%and 950%than that of the as-cast alloy respectively.However,with the further increase of hot-rolling temperature,the grain size increases and the mechanical properties decline.The excellent mechanical properties of the alloy with a rolling temperature of 900℃are the result of dislocation,solid solution,second phase and grain refinement.

关 键 词：高熵合金 微观组织 力学性能 强化机制 真空电弧熔炼 

分 类 号：TG139[一般工业技术—材料科学与工程]