Microstructure Recrystallization and Mechanical Properties of a Cold-Rolled TiNbZrTaHf Refractory High-Entropy Alloy

作     者：Chuan Rong Jieren Yang Xiaoliang Zhao Ke Huang Ying Liu Xiaohong Wang Dongdong Zhu Ruirun Chen Chuan Rong;Jieren Yang;Xiaoliang Zhao;Ke Huang;Ying Liu;Xiaohong Wang;Dongdong Zhu;Ruirun Chen

作者机构：College of Materials Science and EngineeringSichuan UniversityChengdu610065China Key Laboratory of Air-Driven Equipment Technology of Zhejiang ProvinceQuzhou UniversityQuzhou324000China School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin150001China 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2024年第37卷第4期

页      面：633-647页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by the Key R&D Plan of Sichuan Province(23ZDYF0546 and SC2022A1C01J) China Nuclear Power Research and Design Institute-Sichuan University Joint Innovation Fund(HG2022173&JG2022311) the Natural Science Foundation of Zhejiang Province(LQ20E010003) 

主　　题：Refractory high entropy alloy Cold rolling Recrystallization Oxidation resistance Mechanical properties 

摘      要：The equiatomic TiNbZrTaHf alloy was successfully rolled at room temperature with the reduction of ~ 85%. The microstructure and tensile properties were investigated after cold working and annealing. It was determined that the recrystallization temperature of the TiNbZrTaHf alloy between 850 and 900 ℃. Complete recrystallization and normal grain growth occurred, the high stability of single phase was maintained after annealing at 1000, 1200, and 1400 ℃. But the precipitated phase appeared after long term annealing, as seen after 500 h at 1000 ℃. After cold working, the tensile strength and the elongation of TiNbZrTaHf were 1137 MPa and 25.1%, respectively. The annealed alloy has a high tensile strength (σ_(b )= 863 MPa) and ductility (ε_(e )= 28.5%). Moreover, the oxidation of TiNbZrTaHf alloy at elevated temperatures has a significant impact on its mechanical properties. The poor oxidation resistance of TiNbZrTaHf can accelerate tensile failure by inducing fractures at grain boundaries.