Effect of boron on microstructure and mechanical properties of cast Ti-44Al6-Nb ingots  

作　　者：Jian-chong Li Rui-run Chen Zhi-kun Ma Xiao-yu Chen Hong-sheng Ding Jing-jie Guo 

机构地区：[1]AVIC Beijing Institute of Aeronautical Materials [2]School of Materials Science and Engineering,Harbin Institute of Technology [3]Department of Tank Repair, People's Liberation Army Armored Force Engineering Institute

出　　处：《China Foundry》2015年第1期9-14,共6页中国铸造（英文版）

基　　金：supported by the Program of New Century Excellent Talents in University(NCET-12-0153);National Natural Science of Foundation of China(51274076);National Basic Research Program of China(2011CB605504)

摘　　要：In order to improve the mechanical properties of Ti Al alloys, especially the ductility at room temperature, and to study the effect of boron(B) on Ti Al alloys, different contents(0, 0.1, 0.3, 0.6, 0.9, 1.2, at.%) of B were added into Ti-44Al-6Nb alloys to prepare ingots. The surface quality, macrostructure, microstructure, compressive properties and fracture surface of the ingots were studied. The results show that B has little influence on the surface quality except that there are some dark spots on the surface when the content of B is 0.9%. B can refine the grains. The average grain size decrease from about 0.8 mm to 0.088 mm with increasing B content. Meanwhile, the grain morphology of these ingots changes from big equiaxed grains with lamellars to fine equiaxed grains. When the content of B is 1.2%, the primary Ti B2 phase forms in the liquid phase and increases the nucleation rate, leading to further refinement of the grains. The compressive testing results show that B can increase the strength and the ductility, the compressive strength and compressibility can reach 2,037.8 MPa and 26.7% from 1,156.2 MPa and 10.2% when the boron content is 0.6%, which is resulted from grain refining and grain boundary strengthening. It is found that the compressive strength and the compressibility are relatively stable when the B content is more than 0.3%.In order to improve the mechanical properties of Ti Al alloys, especially the ductility at room temperature, and to study the effect of boron（B） on Ti Al alloys, different contents（0, 0.1, 0.3, 0.6, 0.9, 1.2, at.%） of B were added into Ti-44Al-6Nb alloys to prepare ingots. The surface quality, macrostructure, microstructure, compressive properties and fracture surface of the ingots were studied. The results show that B has little influence on the surface quality except that there are some dark spots on the surface when the content of B is 0.9%. B can refine the grains. The average grain size decrease from about 0.8 mm to 0.088 mm with increasing B content. Meanwhile, the grain morphology of these ingots changes from big equiaxed grains with lamellars to fine equiaxed grains. When the content of B is 1.2%, the primary Ti B2 phase forms in the liquid phase and increases the nucleation rate, leading to further refinement of the grains. The compressive testing results show that B can increase the strength and the ductility, the compressive strength and compressibility can reach 2,037.8 MPa and 26.7% from 1,156.2 MPa and 10.2% when the boron content is 0.6%, which is resulted from grain refining and grain boundary strengthening. It is found that the compressive strength and the compressibility are relatively stable when the B content is more than 0.3%.

关 键 词：BORON TiAl alloy compressive property grain refining 

分 类 号：TG146.23[一般工业技术—材料科学与工程]