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曹卉,芮执元,冯瑞成,陈文科,冯玉玺,剡昌锋.Al含量对TiAl合金力学性能的影响[J].稀有金属材料与工程(英文),2019,48(4):1102~1108.[Cao Hui,Rui Zhiyuan,Feng Ruicheng,Chen Wenke,Feng Yuxi and Yan Changfeng.Effects of Al content on the mechanical properties of single crystal TiAl alloy[J].Rare Metal Materials and Engineering,2019,48(4):1102~1108.]
Effects of Al content on the mechanical properties of single crystal TiAl alloy
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Received:October 31, 2017  Revised:December 18, 2017
DOI:
Key words: TiAl specimen  Al content  molecular dynamics  plasticity  crack propagation
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Cao Hui,Rui Zhiyuan,Feng Ruicheng,Chen Wenke,Feng Yuxi and Yan Changfeng  
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Abstract:
      TiAl alloy has been widely used in the aerospace and automotive industry because of its excellent properties, but the shortcomings such as brittleness and fracture toughness are still significant at room temperature, which limits its applications. The purpose of this paper is to explain the effects of Al content on the mechanical properties and to discuss the crack propagation mechanism of single crystal TiAl using molecular dynamics simulation. The stress–strain curves and evolution process of the defects were obtained under different Al contents. The results confirmed that the Al content would affect the elastic modulus and the strength of the TiAl alloy. Because of defects, such as stacking faults, dislocations and vacancies, and their migrations result in the plasticity of TiAl tended to be better when the Al content below 45at%. And the specimen implies brittleness with the Al content greater than 45at% obviously. Furthermore, the plasticity deformation dominated the main mode in the low content, while the crack fracture presented brittleness when the Al content is high. Al contents would affect the mechanical proprieties of TiAl alloy and the plasticity of TiAl would increase with decreasing Al content. In addition, the mechanism of crack propagation would vary with the change of Al content.