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《Journal of University of Science and Technology Beijing》 2009-02
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Effect of Mn content on the microstructure and mechanical properties of cast high Nb containing TiAl alloys

WANG Yan-li,LI Shi-lei,PENG Ling-jian,LIN Jun-pin,CHEN Guo-liang State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China  
The microstructure and mechanical properties of two high Nb containing TiAl alloys with different Mn contents,Ti46Al8Nb2Mn0.2B and Ti46Al8Nb1.3Mn0.2B,were studied.XRD and SEM results show that the Ti46Al8Nb2Mn0.2B alloy obtains duplex microstructure with a few brittle β phases after hot isostatic pressing(HIP)and cyclic heat treatment.By thermostatic treatment in two-phase area for long time after HIP,no β phases were found in the microstructure of the Ti46Al8Nb1.3Mn0.2B alloy.Tensile test shows that the mechanical properties improve with decreasing Mn content,and the elongation,yield strength and breaking strength of the Ti46Al8Nb1.3Mn0.2B alloy are 2.4%,548 MPa and 660 MPa,respectively.The fracture morphologies indicate that the fracture of the two alloys at room temperature belongs to brittle cleavage fracture.
【Fund】: 国家自然科学基金资助项目(No.123456789)
【CateGory Index】: TG136.1
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