Microstructure Evolution and Mechanical Properties of New Ti-Al-Fe-B Titanium Alloy with High Strength and Ductility

被引：0

作者：

Liu, Chang ^{[1
,2
,3
]}

Dong, Yuecheng ^{[1
,4
]}

Fang, Zhigang ^{[4
]}

Wang, Ying ^{[2
]}

Guo, Yanhua ^{[1
]}

Chang, Hui ^{[1
,3
]}

Zhou, Lian ^{[1
]}

机构：

[1] College of Materials Science and Engineering, Tech Institute for Advanced Materials, Nanjing Tech University, Nanjing,211800, China

[2] State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan,114000, China

[3] Center of Jiangsu Advanced Inorganic Functional Composites Co-innovation, Nanjing,211899, China

[4] Naval Research Institute, Beijing,100000, China

来源：

Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | 2020年 / 49卷 / 05期

关键词：

Heat treatment - Aluminum - Elongation - Iron alloys - Tensile strength - Aluminum alloys - Grain size and shape - Yield stress - Textures;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Effect of Al element addition (1wt%~3wt%) and heat treatment on microstructure evolution and mechanical property of a new alloy Ti-xAl-3.5Fe-0.1B was studied. Results indicate that Ti-xAl-3.5Fe-0.1B is α+β two-phase titanium alloy. Yield strength of the alloy increased from 590 MPa to 900 MPa and tensile strength increased from 808 MPa to 1074 MPa with the variation of Al element from 1% to 3% due to solid solution strengthening effect; at the same time, the elongation decreased to 15.4%. Microstructure observation reveals that the thickness of the lamellar primary α phase was reduced and the grain size was remarkably refined with the increasing Al element content. Meanwhile, it is found that yield strength continuously increased to 1000 MPa, tensile strength increased to 1144 MPa and the elongation increased to 17.5% after double annealing, which indicates unique mechanical property. The metastable β phase formed in the microstructure was decomposed to secondary α phase with fine grain size during the double annealing in the alloy, which blocked the movement of dislocation and induced enhancement of strength. At the same time, the dispersion of secondary α phase on β substrate was also beneficial to the strength. On the other hand, the presence of equiaxed α phase was considered favorable to the improvement of elongation. © 2020, Science Press. All right reserved.

引用

页码：1607 / 1613