TY - JOUR
T1 - Effect of Zr addition on microstructures and mechanical properties of Ni-46Ti-4Al alloy
AU - Li, Yan
AU - Yu, Kaiyuan
AU - Song, Xiaoyun
AU - Zhang, Fei
PY - 2011/10
Y1 - 2011/10
N2 - 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.
AB - 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.
KW - intermetallics
KW - mechanical properties
KW - microstructure
KW - zirconium
UR - https://www.scopus.com/pages/publications/80054049894
U2 - 10.1007/s12598-011-0423-1
DO - 10.1007/s12598-011-0423-1
M3 - 文章
AN - SCOPUS:80054049894
SN - 1001-0521
VL - 30
SP - 522
EP - 526
JO - Rare Metals
JF - Rare Metals
IS - 5
ER -