Fatigue properties of a medium-strength γ-TiAl alloy with different surface conditions

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• 作者：Zhen-Jun Yang ; Hong-Liang Sun ; Ze-Wen Huang ; Xiao-Song Jiang ; Song Chen
• 关键词：γ ; TiAl alloy ; Fatigue property ; Surface condition ; Notch sensitivity ; Microstructure
• 刊名：Rare Metals
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：35
• 期：1
• 页码：93-99
• 全文大小：1,066 KB
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• 作者单位：Zhen-Jun Yang (1)
  Hong-Liang Sun (1)
  Ze-Wen Huang (1)
  Xiao-Song Jiang (1)
  Song Chen (1)
  
  1. Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Metallic Materials
  Chinese Library of Science
  
• 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
• ISSN：1867-7185

文摘

Effects of surface condition on fatigue properties of a medium-strength γ-TiAl alloy Ti–45Al–5Nb–1W (at%) were investigated. It is found that the maximum stresses of fatigue samples are lower than the yield stresses of the medium-strength γ-TiAl alloy. Meanwhile, the local plastic deformation is unconspicuous to occur at the crack tip. In this case, the fatigue strength is mainly decided by surface conditions of maximum-stressed surface, but compressive stress and deformation especially resulted from shot peening play an important role in the improvement of the condition fatigue strength. The affecting depth of shot peening is about 250 μm. As a result, the relatively weak microstructures and phases become the preferential initiation sites and propagation routes. They are observed to be equiaxed γ grains, B2 + ω grains, and α₂-γ lamellar interface in soft orientations. The existence of V-notch can significantly reduce the fatigue properties of the samples.