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冯瑞成,卢建涛,曹 卉,李海燕,闫 峰,司皇腾.不同应变比下γ-TiAl合金疲劳裂纹扩展机理的研究[J].稀有金属材料与工程(英文),2018,47(9):2821~2826.[Feng Ruicheng,lujiantao,Cao Hui,Li Haiyan,Yan Feng and Si Huangteng.The Study on Fatigue Crack Propagation Mechanism of γ-TiAlAlloy under Different Strain Ratio[J].Rare Metal Materials and Engineering,2018,47(9):2821~2826.]
The Study on Fatigue Crack Propagation Mechanism of γ-TiAlAlloy under Different Strain Ratio
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Received:September 30, 2016  Revised:April 19, 2017
DOI:
Key words: strain ratio  fatigue crack propagation  γ-TiAl alloy  stacking fault  molecular dynamics
Foundation item:教育部“创新团队发展计划”(IRT_15R30);甘肃省自然科学基金(148RJZA008);甘肃省高校科研项目(2014A-033);国家自然科学基金(51665030)
Author NameAffiliation
Feng Ruicheng,lujiantao,Cao Hui,Li Haiyan,Yan Feng and Si Huangteng  
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Abstract:
      The mechanism of fatigue crack propagation of γ-TiAl alloy under different strain ratios is studied using the molecular dynamics method. The results show that fatigue crack propagates in the manner of cleavage firstly, and then propagates through disordered region by driving force. Finally, it changes into sub-main crack mechanisms. The difference is that the change in the mode of crack propagation occurs at different times under different strain ratios. At the stage of plastic deformation, dislocations emit at different times and glide at different planes due to different strain ratios. Defects, such as vacancies, divacancies, trivacancies, etc are generated during dislocation gliding. Meanwhile stacking faults are generated along the different close-packed planes under different strain ratios.