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

作     者：Z.M. Song L.M. Lei B. Zhang X. Huang G.R Zhang 

作者机构：Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of SciencesShenyang 110016 China AVIC Commercial Aircraft Engine Co. Ltd. Shanghai 200241 China Titanium Alloys Laboratory Beijing Institute of Aeronautical Materials Beijing 100095 China Key Laboratory for Anisotropy and Texture of Materials of Ministry of Education School of Materials and MetallurgyNortheastern University Shenyang 110819 China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2012年第28卷第7期

页      面：614-621页

核心收录：

学科分类：08[工学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 081402[工学-结构工程] 081304[工学-建筑技术科学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0813[工学-建筑学] 0814[工学-土木工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported by the National Basic Research Program of China (No. 2007CB613803) the National Natural Science Foundation of China (No.51071158) the Fundamental Research Funds for the Central Universities (No. N100702001) 

主　　题：Ti alloy Fatigue crack initiation Crack propagation Microstructure 

摘      要：Fatigue cracking behavior from a notch was investigated at room temperature for ***-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.