Microstructure Dependent Fatigue Cracking Resistance of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Alloy

材料科学技术（英文）, 2012, 28(7): 614-621.

Microstructure Dependent Fatigue Cracking Resistance of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Alloy

^1, , ^2, , ^3, , ^4, , ^5,

1.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110016, China

2.AVIC Commercial Aircraft Engine Co., Ltd., Shanghai 200241, China／Titanium Alloys Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China

3.Key Laboratory for Anisotropy and Texture of Materials of Ministry of Education, School of Materials and Metallurgy,Northeastern University, Shenyang 110819, China

4.Titanium Alloys Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China

5.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110016, China

基金项目: the Fundamental Research Funds for the Central Universities(NI00702001) the National Basic Research Program of China(2007CB613803) the National Natural Science Foundation of China(51071158)

关键词：疲劳破坏 , 微观结构 , 合金 , 结构相关 , 开裂行为 , 缺口疲劳 , 疲劳裂纹 , 层状结构

Microstructure Dependent Fatigue Cracking Resistance of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Alloy

Keywords： Ti alloy , Fatigue crack initiation , Crack propagation , Microstructure ,

Fatigue cracking behavior from a notch was investigated at room temperature for Ti-6.SAI-3.5Mo-1.5Zr- 0.3Si （TClI） alloys with four different microstructures obtained at different cooling rates from the β transus temperature. It was found that the alloy with lamellar structures consisting of α/β lamellae or acicular α＇ martensite laths had a higher fatigue crack initiation threshold from the notch, while the bimodal structure with coarse a grain had a lower fatigue cracking resistance. The alloy with α/β lamellar structure showed a higher fatigue crack growth resistance. The length scales of the microstructures were characterized to correlate with fatigue cracking behavior. Fatigue cracking mechanism related to microstructures was discussed.

参考文献

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材料期刊网

Microstructure Dependent Fatigue Cracking Resistance of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Alloy

Microstructure Dependent Fatigue Cracking Resistance of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si Alloy

参考文献