Phase evolution and mechanical properties of low-activation refractory high-entropy alloy Ti_(1.5)ZrV_(0.5)Ta_(0.5)  

作　　者：Yuxiang Chen Ningyu Li Yijie Wang Kang Liu Yongqin Chang Mingyang Li 

机构地区：[1]School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]Xi’an Rare Metal Materials Institute Co.Ltd,Xi’an 710016,China

出　　处：《Journal of Materials Science & Technology》2024年第7期145-156,共12页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.51971021 and 11775017);the National Magnetic Confinement Fusion Program of China(No.2019YFE03130002).

摘　　要：A novel low-activation Ti_(1.5)ZrV_(0.5)Ta_(0.5)refractory high-entropy alloy(RHEA)was designed as a potential candidate for nuclear reactor application.At room temperature,it had an elongation of 8.4%and a yield strength of 1096 MPa.The phase evolution of this alloy and its effect on properties was investigated.At 400℃,the solid solution bcc 1 transformed into the fcc phase and bcc 2 phase,and theωphase andαphase also appeared.At 600℃,theωphase andαphase disappeared,and the microstructure of the alloy was composed of the fcc phase and bcc 2 phase.When the temperature was up to 1200℃,the fcc phase and bcc 2 phase re-transformed into solid solution bcc 1 phase.The precipitation ofωphase andαphase caused a sharp increase in strength and a decrease in plasticity.Meanwhile,the appearance of the fcc phase led to a simultaneous decrease in strength and ductility,due to larger stress concentrations at the fcc/bcc interface.Besides,the formation mechanism of each phase in the alloy was discussed in detail.

关 键 词：Low-activation Refractory high-entropy alloy Phase evolution Phase formation mechanism Strengthening mechanism 

分 类 号：TG132.32[一般工业技术—材料科学与工程]