Microstructure evolution during high-strain-rate superplastic flow in Al-Ni-misch metal alloy produced from amorphous powders

被引：0
|
作者：
Umakoshi, Y [1 ]
Fujitani, W [1 ]
Nakano, T [1 ]
Inoue, A [1 ]
Ohtera, K [1 ]
Mukai, T [1 ]
Higashi, K [1 ]
机构：
[1] Osaka Univ, Fac Engn, Dept Mat Sci & Engn, Suita, Osaka 565, Japan
来源：
THERMEC '97 - INTERNATIONAL CONFERENCE ON THERMOMECHANICAL PROCESSING OF STEELS AND OTHER MATERIALS, VOLS I-II | 1997年
关键词：
D O I：
暂无
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Changes in microstructure and deformation substructure in Al-14mass%Ni-14mass%misch metal alloy produced from amorphous powders were investigated during superplastic deformation at a high-strain-rate of 1s(-1) at 873K. Grain refinement occurred and the frequency of small angle boundaries increased in superplastically deformed specimens. Dynamic recovery and recrystallization occurred. Dislocations were observed in grains and were annihilated at grain boundaries during superplastic deformation. High-strain-rate superplasticity was mainly controlled by grain boundary sliding. Dislocations played an important role in the accommodation of residual stress induced by the grain boundary sliding. Small precipitates of Al(3)Mm and Al3Ni effectivaly suppressed the grain growth during annealing and acted as nucleation and/or annihilation sites of dislocations.
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页码：1983 / 1989
页数：7
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