摘要
在一定组织形态和外界条件下,单相或多相的镍铝金属间化合物及其合金表现出超塑性变形行为,其中多相挤压态NiAl合金及单相Ni3Al合金的超塑性变形机制是晶界滑移(动态回复和再结晶协调变形);单相NiAl的超塑性变形则来自于变形过程中发生动态回复和再结晶;而定向凝固多相NiAl合金的超塑性则是在拉伸过程中动态再结晶与应变硬化平衡的结果。超塑性变形机制多样性源于镍铝金属间化合物晶体结构独特的物理性质。
The superplasticity in multi- and single-phase nickle-aluminides is reviewed. The superplasticity of these intermetallic compound possess all characteristics of conventional superplastic materials. The superplasticity of multiphase and part of single-phase nickle-aluminides is stemmed from the grain boundary sliding, and that of directionally solidified nickle-aluminides is come from the balance between strain hard （movement of dislocation） and strain soft （the dynamic recovery and recrystallization）, while the dynamic recovery and recrystallization are the superplastic deforming mechanism for NiAl in single-phase. The multi-mechanism of superplasticity arises from the microstructure and dislocation characteristics of the ordered intermetallic compound.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2006年第F05期446-449,共4页
Materials Reports
基金
国家自然科学基金重大项目(59895152)
"863"高技术项目(863-715-005-0030)资助
