NiTiAl Intermetallic Alloys Strengthened by Mo Replacement

查看全文 作　　者：Song [1,2]Xiaoyun Li [1,2]Yan Zhang [1,2]Fei Li [1,2]Shusuo

机构地区：[1]School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;[2]Key Laboratory of Aerospace Materials and Performance (Ministry of Education), Beijing University of Aeronautics and Astronautics, Bering 100191, China

出　　处：《Chinese Journal of Aeronautics》索引2010年第23卷第6期,共5页

基　　金：New Century Program for Excellent Talents of Ministry of Education of China (NCET-09-0024) 摘　　要：NiTiAl based alloys have attracted attention as potential high temperature structural materials.Alloying is an effective way to improve their mechanical properties.The microstructures and mechanical properties of Ni50Ti44?xAl6Mox(x = 0,0.5,1,1.5,3) alloys have been investigated by X-ray diffraction(XRD),scanning electron microscope(SEM),transmission electron microscope(TEM) and compressive tests.It is found that Ni50Ti44?xAl6Mox alloy is composed of NiTi(B2) and Ti2Ni(FCC) phases when Mo content is no more than 1 at%.The effect of Mo solid solution hardening at room temperature has been indicated by the rise of yield strength and the fall of plasticity with increasing Mo content.For Ni50Ti42.5Al6Mo1.5 and Ni50Ti41Al6Mo3 alloys,a Mo solid solution appears and increases the yield strength by precipitation strengthening.The maximum yield strength at 600 °C and elevated temperatures is presented in Ni50Ti43Al6Mo1 alloy not in alloys with a higher Mo content,which is possibly due to the softness of Mo-Ti-Ni solid solution phase. 关键词：TIAL基合金钼化合物扫描电子显微镜透射电子显微镜加固高温结构材料机械性能屈服强度

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NiTiAl Intermetallic Alloys Strengthened by Mo Replacement

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