摘要
本文研究了Ni-30Al-5Mo-0.5Hf金属间化合物的显微组织及其超塑性变形行为.该合金是由NiAl/Ni3Al/Mo三相组成,在NiAl中分散着大量的条状Ni3Al.在1050-1100℃,应变速率为5.2X10-4-6.24X10-3s-1拉伸变形时,合金呈现超塑性行为;1050℃,5.2X10-4s-1时的最大延伸率达160％,此时对应的应变速率敏感指数为0.46.超塑性变形的机理主要是由于变形过程中的动态回复和再结晶,同时合金中的NiAl和Ni3Al两相在高温下可以协调变形.
The microstructure of NiAl-based multiphase alloy Ni-30Al-5Mo-0.5Hf has been investigated, which consists of NiAl, Ni3Al and Mo, and there also existed large amount of strip Ni3Al in the NiAl. The alloy exhibits superplastic behavior over a narrow temperature ranges from 1050 to 1100 degreesC at the strain rate range of 5.2x10(-4) s(-1) - 6.24x10(-3) s(-1). A maximum tensile elongation of 160% was obtained at 1050 degreesC with the strain rate sensitivity up to 0.46. The mechanism for superplastic is a process of dynamic recovery and recrystalline.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第7期679-683,共5页
Acta Metallurgica Sinica
基金
国家自然科学基金重大项目 59895152
863高技术项目 715-005-0030资助
关键词
NIAL
超塑性
动态回复
再结晶
NiAl
superplastic
dynamic recovery and recrystalline
