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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 16    No. 2    April 2006

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Influence of recrystallization and environment on tensile behavior of cold-rolled Ni3Al(Zr) alloys
LI Yu-fang(李玉芳)1, GUO Jian-ting(郭建亭)2, SHEN Yi-fu(沈以赴)1

1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics,Nanjing 210016, China;
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Abstract:The effects of recrystallization and environment (vacuum versus air) on tensile properties of B-free Ni3Al (Zr) alloys were investigated. The results indicate that the incompletely recrystallized and stress-relieved specimens show the most desirable ductility and ultimate tensile strength, and that the recrystallization treatment promotes susceptibility to the test environment of the alloys. It is found that the amount of ductile fracture is reduced by air for completely recrystallized specimens. The Auger analyses show that Zr atoms do not segregate to the grain boundaries(GBs) for specimens heat-treated at 1 100 ℃, however Zr atoms segregate to the GBs for specimens heat-treated at 900 ℃. These results imply that Zr-doping cannot suppress environmental embrittlement.

 

Key words: Ni3Al; Ni3Al(Zr); Zr-doping; recrystallization; tensile properties; environmental embrittlement

ISSN 1672-7029
CN 43-1423/U

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