【摘 要】
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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),transmis
【机 构】
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School of Materials Science and Engineering,Key Laboratory of Aerospace Materials and Performance(Mi
论文部分内容阅读
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)2Ni with Zr as a solid solution element in both phases,and the third phase,(Zr,Ti,Al)2Ni,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)2Ni 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)2Ni 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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