Effects of Voids on Mechanical Property of Single Crystal γ-TiAl Alloys Containing Nb
KOU Peipei1, 2, FENG Ruicheng1, 2, LI Haiyan1, 2, LI Longlong1, 2, WANG Maomao1, 2, QI Yongnian1, 2
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
Abstract: The effects of void size, number and position on the mechanical properties of single crystal γ-TiAl alloys containing Nb were studied by mole-cular dynamics method. The relationship between the micro-defect evolution inside the material and the change of the mechanical properties of the material was analyzed. The results indicate that the yield strength and elastic modulus of single crystal γ-TiAl alloys are increased with the addition of Nb element. With the increase of void size and number, the yield strength of single crystal γ-TiAl alloys containing Nb decreases in sequence, which is mainly due to the voids as a dislocation source in the stretching process, which provides conditions for the nucleation and emission of dislocations. When several voids are distributed parallel to the tensile direction, the yield stress of the material is the largest. And when the distribution of the voids perpendicular to the tensile direction, the yield stress of the material is the smallest, which is the most likely to lead to the failure of the material.
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2020, Vol. 34 
