Fracture characteristics of a notched investment cast TiAl alloy through in situ SEM observation
Gamma TiAl alloys have been widely regarded as a very demanding material for a wide range of potential applications in the aerospace system and automotive industry.Investment casting of TiAl alloys has become the most promising cost-effective technology for the manufacturing of TiAl components.The understanding of fracture behavior will provide a useful insight into the failure mechanism of investment cast TiAl alloys.The present work mainly focuses on the fracture characteristics and crack propagation of a notched investment cast TiAl alloy in tension under incremental loading conditions through in situ SEM observation.The results show that the fracture mechanism was sensitive to not only the microcracks near the notched area but also lamellar orientation to loading axis.The high tensile stress component then propagates the nucleated microcracks to failure with local stress intensity reaching the toughness of the material.Thus,both plasticity and high tensile stress are required to cause notched TiAl failure.
TiAl alloys investment cast fracture characteristics in situ SEM observation
Chen Yanfei Zheng Shunqi Tu Jiangping Xiao Shulong Tian Jing Xu Lijuan Chen Yuyong
Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China; Ningbo Ningbo Sub-academy of the National Weapons Science Research Academy, Ningbo 315103, China Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
国际会议
上海
英文
257-257
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）