Mechanical behaviors of NiAl-Cr(Mo)-based near eutectic alloy with Ti, Hf, Nb and W additions

被引：19

作者：

Tang Lin-zhi ^{[1
]}

Zhang Zhi-gang ^{[1
]}

Li Shu-suo ^{[1
]}

Gong Sheng-kai ^{[1
]}

机构：

[1] Beijing Univ Aeronaut & Astronaut, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2010年 / 20卷 / 02期

关键词：

NiAl-Cr(Mo)-based alloy; Heusler phase; Cr(Mo; W) solid solution; mechanical properties; MICROSTRUCTURE; DEFORMATION;

D O I：

10.1016/S1003-6326(09)60123-0

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Effects of Ti, Hf, Nb and W alloying elements addition on the microstructure and the mechanical behaviors of NiAl-Cr(Mo) intermetallic alloy were investigated by means of XRD, SEM, EDX and compression tests. The results show that Ni-31Al-30Cr-4Mo-2(Ti, Hf, Nb, W) alloy consists of four phases: NiAl, alpha-Cr solid solution, Cr2Nb and Ni2Al(Ti, Hf). The mechanical properties are improved significantly compared with the base alloy. The compression yield strength at 1 373 K is 467 MPa and the room temperature compression ductility is 17.87% under the strain rate of 5.56 x 10(-3) s(-1), due to the existence of Cr2Nb and Ni2Al( Ti, Hf) phases for strengthening and Ti solid solution in NiAl matrix and coarse Cr(Mo, W) solid solution phase at cellular boundaries for ductility. The elevated temperature compression deformation behavior of the alloy can be properly described by power-law equation: (epsilon) over dot = 0.898 sigma(8.47)exp[-615/(RT)].

引用

页码：212 / 216

页数：5

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