Effect of Crystal Orientation and Temperature on Fracture Behaviour of Single Crystal TiAl-Nb Alloys with Void
KOU Peipei1,2, FENG Ruicheng1,2, LI Haiyan1,2, LI Longlong3
1 School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2 Key Laboratory of Digital Manufacturing Technology and Application, The Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China 3 Jinchuan Group Co., Ltd. Third Mining Area, Jinchuan 737100, China
Abstract: The effects of crystal orientation and temperature on the fracture behaviour of single crystal TiAl-Nb alloys with void were studied by molecular dynamics method. The mechanical properties and internal micro-defect evolution of TiAl-Nb alloys under different conditions were analyzed. The results show that, the crystal orientation has a significant effect on the mechanical properties of TiAll-Nb alloys with voids, but has little effect on the fracture behaviour of it, which is maybe due to the reason that the solid solution strengthening effect is greater than that of dislocation because of the addition of Nb element. The higher the temperature lead to the smaller yield stress, yield strain and Young's modulus of TiAl-Nb alloys, the time is earlier when the dislocations first nucleate at the void, the fewer number and type of dislocations, as well as the time of the material failure is earlier.
寇佩佩, 冯瑞成, 李海燕, 李龙龙. 晶向和温度对含孔洞单晶TiAl-Nb合金断裂行为的影响[J]. 材料导报, 2021, 35(10): 10114-10119.
KOU Peipei, FENG Ruicheng, LI Haiyan, LI Longlong. Effect of Crystal Orientation and Temperature on Fracture Behaviour of Single Crystal TiAl-Nb Alloys with Void. Materials Reports, 2021, 35(10): 10114-10119.
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2021, Vol. 35 
