Effect of Zr addition on microstructures and mechanical properties of Ni-46Ti-4Al alloy
来源期刊：Rare Metals2011年第5期
论文作者：LI Yan a, b , YU Kaiyuan a , SONG Xiaoyun a, b , and ZHANG Fei a a School of Materials Science and Engineering, Beihang University, Beijing , China b Key Laboratory of Aerospace Materials and Performance (Ministry of Education of China), Beihang University, Beijing , China
文章页码：522 - 526
摘 要：The microstructures and mechanical properties of Ni-（46-x）Ti-4Al-xZr （x = 0-8, at.%） alloys have been investigated by scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, and mechanical tests. The results show that the Ni-Ti-Al-Zr alloys are composed of TiNi and （Ti, Al） 2 Ni with Zr as a solid solution element in both phases, and the third phase, （Zr, Ti, Al） 2 Ni, appears in Ni-40Ti-4Al-6Zr and Ni-38Ti-4Al-8Zr alloys. The compressive yield strength at room temperature increases with the increase of Zr content due to the solid-solution strengthening of Zr and precipitation strengthening of （Ti, Al, Zr） 2 Ni phase. However, the Ni-42Ti-4Al-4Zr alloy exhibits the maximum compressive yield strength at 873 and 973 K because of the softening of （Zr, Ti, Al） 2 Ni phase in the alloys with more Zr addition. The tensile stress-strain tests and the SEM fracture surface observations show that the brittle to ductile transition temperature of Ni-42Ti-4Al-4Zr alloy is between 873 and 923 K.
摘要：The microstructures and mechanical properties of Ni-（46-x）Ti-4Al-xZr （x = 0-8, at.%） alloys have been investigated by scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, and mechanical tests. The results show that the Ni-Ti-Al-Zr alloys are composed of TiNi and （Ti, Al） 2 Ni with Zr as a solid solution element in both phases, and the third phase, （Zr, Ti, Al） 2 Ni, appears in Ni-40Ti-4Al-6Zr and Ni-38Ti-4Al-8Zr alloys. The compressive yield strength at room temperature increases with the increase of Zr content due to the solid-solution strengthening of Zr and precipitation strengthening of （Ti, Al, Zr） 2 Ni phase. However, the Ni-42Ti-4Al-4Zr alloy exhibits the maximum compressive yield strength at 873 and 973 K because of the softening of （Zr, Ti, Al） 2 Ni phase in the alloys with more Zr addition. The tensile stress-strain tests and the SEM fracture surface observations show that the brittle to ductile transition temperature of Ni-42Ti-4Al-4Zr alloy is between 873 and 923 K.
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