Microstructure and mechanical properties of Ti44Al6Nb1Cr2V alloy after gaseous hydrogen charging at 1373-1693 K  

作　　者：Teng-Fei Ma Rui-Run Chen De-Shuang Zheng Jing-Jie Guo Hong-Sheng Ding Yan-Qing Su Heng-Zhi Fu 

机构地区：[1]School of Materials Science and Engineering,Harbin Institute of Technology,Harbin,150001,China

出　　处：《Rare Metals》2023年第2期664-671,共8页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.51274076);the National Science Fund for Distinguished Young Scholars(No.NSFC51425402)。

摘　　要：The hydrogenation behavior of Ti44A16Nb1Cr2V(at%)alloy at temperature range of 1373-1693 K and its effect on microstructure and room-temperature mechanical properties were studied systematically in this study.The results show that hydrogen content increases with the increase in temperature,and the maximum hydrogen content is 0.126 wt%at 1693 K.The heat of solution of hydrogen is calculated as 82.9 kJ·mol^(-1)by curve fitting,indicating that hydrogen absorptionin TiAl alloys is endothermic.Hydrogen promotes the lamellar colony size because hydrogen promotes the diffusion of elements.Hydrogen stabilizes B2phase during hydrogenation resulting in more residual B2phase in the hydrogenated alloy.The nanohardness and elastic modulus decrease after hydrogenation due to that hydrogen weakens the bonds.The Ti44A16Nb1Cr2V alloy exhibits higher plasticity and lower flow stress hydrogenation with 0.039 wt%H,and the ultimate compressive strength decreases from 1220 to 1130 MPa,while the fracture strain is enhanced by 26%.

关 键 词：TiAl alloys HYDROGENATION Hydrogen content Nanohardness Compressive property 

分 类 号：TG146.23[一般工业技术—材料科学与工程]