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Superplasticity of single-phase Ni―45Al intermetallics with large grains

机译:大晶粒单相Ni―45Al金属间化合物的超塑性

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摘要

Superplasticity was found in single-phase Ni-45A1 alloy with initial grain size of 270μm. A maximum elongation of 245% was obtained. The grains refined after superplastic deformation. TEM observation showed that an unstable subgrain boundary network formed during superplastic deformation. The subgrain boundaries were transformed into low- and high-angle grain boundaries by absorbing gliding dislocations. The large-grained superplastic phenomenon could be explained by continuous recovery and recrystallization.
机译:在单相Ni-45A1合金中发现了超塑性,初始晶粒尺寸为270μm。获得的最大伸长率为245%。超塑性变形后,晶粒细化。透射电镜观察表明,超塑性变形过程中形成了不稳定的亚晶界网络。通过吸收滑动位错,将亚晶界转变为低角度和高角度晶界。大晶粒超塑性现象可以用连续恢复和再结晶来解释。

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