NiTiAl Intermetallic Alloys Strengthened by Mo Replacement |
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Authors: | Song Xiaoyun Li Yan Zhang Fei Li Shusuo |
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Institution: | a School of Materials Science and Engineering, Beijing University of Aeronautics and Astronauticsb Key Laboratory of Aerospace Materials and Performance (Ministry of Education), Beijing University of Aeronautics and Astronautics |
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Abstract: | 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 mi-croscope (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 indi-cated 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 maxi-mum 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. |
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