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《Materials for Mechanical Engineering》 2013-10
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Fracture Mechanism of Tensile Fatigue for TiAl Based Alloys

LIN You-zhi;ZHOU Shao-qiu;CAO Rui;CHEN Jian-hong;Ningde Vocational and Technical College;State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials,Lanzhou University of Technology;  
TiAl based alloys were tested in tensile fatigue experiment,and their facture morphology was observed to study the facture mechanism of tensile fatigue.The results show that there were orientations of river pattern and sole crack initiation origin on the fracture of the alloy.The fracture surface was composed of a lot of inter-lamellas which were dominant and little trans-lamellas.The crack initiation origin was located at the corner of fracture surface,and the cracks propagated along different orientations to the edges of the specimen,then the specimen fractured.The fracture mechanism is described as following:several interlamellar cracks successively initiate under tensile fatigue loading at a highly stressed site,then the fatigue crack extends continuously by the cycling of fatigue stress.When the length of fatigue crack reaches the critical crack length matching to the loading stress,which means the Griffiths condition,the cleavage fracture of specimen will take place.
【Fund】: 国家自然科学基金资助项目(50471109);; 宁德市科学技术计划项目(20100012)
【CateGory Index】: TG146.23
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【Co-citations】
Chinese Journal Full-text Database 1 Hits
1 Wang Mengguang,Sun Jianke,Chen Zhiqiang(Luoyang Ship Material Research Institute,Luoyang 471309,China);Current Status on Melting and Casting Process of Gamma TiAl Based Alloys[J];Titanium Industry Progress;2010-04
【Secondary Citations】
Chinese Journal Full-text Database 3 Hits
1 ZHANG Ji,ZHONG Zengyong(High Temperature Materials Division,China Iron and Steel Research Institute Group,Beijing 100081,China);Research and Development of TiAl Intermetallics-Based Alloys[J];Materials China;2010-02
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3 Li Lei1,Cao Rui1,Zhang Ji2,Chen Jianhong1,Zhang Junfeng1 (1.State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials,Lanzhou University of Technology,Lanzhou 730050,China;2.High Temperature Material Research Division,Central Iron and Steel Research Institute,Beijing 100081,China);Study on Compressive Fracture Behaviors of TiAl-Based Alloys at Different Strain Rates[J];Chinese Journal of Rare Metals;2008-04
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