Rare Metals

, 30:522 | Cite as

Effect of Zr addition on microstructures and mechanical properties of Ni-46Ti-4Al alloy

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Abstract

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.

Keywords

intermetallics zirconium microstructure mechanical properties 
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Copyright information

© The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringBeihang UniversityBeijingChina
  2. 2.Key Laboratory of Aerospace Materials and Performance (Ministry of Education of China)Beihang UniversityBeijingChina

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