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研究双相Ni-31Al金属间化合物的高温变形行为。结果表明,该合金在950~1075℃温度范围,1.25×10-4~8×10-3s-1应变速率范围内呈超塑性变形。在温度为1000℃、应变速率为5×10-4s-1时,最大延伸率可达281.3%。显微结构分析表明,超塑性变形过程中两相具有很好的协调变形能力,超塑性变形后原始组织拉长、细化。双相Ni-31Al金属间化合物超塑性变形机制可能为连续动态回复与再结晶。
The study of high temperature deformation behavior of two-phase Ni-31Al intermetallics. The results show that the alloy is superplastically deformed in the temperature range of 950 ~ 1075 ℃ and in the strain rate range of 1.25 × 10-4 ~ 8 × 10-3s-1. At a temperature of 1000 ℃ and a strain rate of 5 × 10-4s-1, the maximum elongation reaches 281.3%. Microstructure analysis shows that the two phases in the superplastic deformation process have a good coordination and deformation ability, and the original tissue is elongated and refined after the superplastic deformation. The mechanism of superplastic deformation of biphasic Ni-31Al intermetallics may be continuous dynamic recovery and recrystallization.