摘要
采用真空电弧熔炼制备了Al_(0.5)Nb_(1.5)TiV_(2)Zr_(0.5)高熵合金,并研究了其微观组织、密度及力学性能。结果表明,Al_(0.5)Nb_(1.5)TiV_(2)Zr_(0.5)合金由为90.6%(体积分数)的体心立方相和9.4%(体积分数)的C14-Laves第二相组成。合金基体相富含Ti和V,第二相富含Al和Zr。合金的密度为6284 kg/m3,维氏硬度为5197.9 MPa。合金的屈服强度随温度升高而降低,由室温下1082.9 MPa降低到1073 K下的645.0MPa。压缩应变由室温下的27.20%降低到873 K下的14.94%,这与合金中原子间的相互作用力随温度升高而降低有关。在1073 K时合金应变超过50%,表现出良好的塑性而未发生断裂。压缩测试结果表明,合金韧脆转变温度在873~1073 K之间。
The Al_(0.5)Nb_(1.5)TiV_(2)Zr_(0.5)high entropy alloy was prepared by vacuum arc melting,and its microstructure,density,and mechanical properties were investigated.Results show that Al_(0.5)Nb_(1.5)TiV_(2)Zr_(0.5)alloy consists of 90.6vol%body-centered cubic phase and 9.4vol%C14-Laves secondary phase.The matrix phase of the alloy is rich in Ti and V,and the secondary phase is rich in Al and Zr.The alloy has a low density of 6284 kg/m3 and Vickers hardness of 5197.9 MPa.The yield strength of alloy is decreased with increasing the temperature:it decreases from 1082.9 MPa at room temperature to 645.0 MPa at 1073 K.The compressive strain decreases from 27.20%at room temperature to 14.94%at 873 K,which is related to the decrease in atomic interaction force when the temperature rises.At 1073 K,the compressive strain of alloy exceeds 50%,indicating the good plasticity without fracture.The results of compression tests show that the ductile-brittle transition temperature ranges from 873 K to 1073 K.
作者
蒋文韬
王晔
姜博
王晓红
马腾飞
朱冬冬
Jiang Wentao;Wang Ye;Jiang Bo;Wang Xiaohong;Ma Tengfei;Zhu Dongdong(School of Materials Science and Chemical Engineering,Harbin University of Science and Technology,Harbin 150040,China;Key Laboratory of Air-Driven Equipment Technology of Zhejiang Province,Quzhou University,Quzhou 324000,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2023年第3期846-851,共6页
Rare Metal Materials and Engineering
基金
National Natural Science Foundation of China(52171113)。
