Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 20    No. 12    December 2010

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Microstructural evolution and mechanical properties of
new multi-phase NiAl-based alloy during heat treatments
XIE Yi(谢 亿)1, 2, GUO Jian-ting(郭建亭)2, ZHOU Lan-zhang(周兰章)2,
CHEN Hong-dong(陈红冬)1, LONG Yi(龙 毅)1

1. Hunan Electric Power Test and Research Institute, Changsha 410007, China;
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Abstract:Microstructural evolution and the relationship between microstructure and property during heat treatments in a new NiAl-based alloy (Ni-26.6Al-13.4Cr-8.1Co-4.3Ti-1.3W-0.9Mo, molar fraction, %)) were investigated. The as-cast alloy is composed of NiAl matrix and Cr3Ni2 phase with poor ductility. The Cr3Ni2 phase is distributed as a network along the NiAl grain boundaries. Subsequent heat treatment (1 523 K, 20 h, air cooling+1 123 K, 16 h, furnace cooling) leads to the dissolution of Cr3Ni2 phase and the precipitation of lath-shaped Ni3Al phase and α-Cr particles, resulting in the improvement of compressive properties and fracture toughness at room temperature. Followed by long-term thermal exposure (1 173 K, 8 500 h), it is found that the residual Cr3Ni2 phase keeps stable while the α-Cr particles coarsen and a great mass of lath-shaped Ni3Al precipitates are degenerated, which compromises most of the above improvements of mechanical properties through heat treatment.


Key words: NiAl-based alloy; heat treatment; microstructure; mechanical properties

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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