粗晶铝合金超塑性变形机理的研究现状

Research status of superplastic deformation mechanism of coarse-grained aluminum alloys

介绍了国内外粗晶铝合金超塑性的基本研究情况。对粗晶铝合金超塑性变形机理的研究进行归类总结,主要包括:扩散蠕变机理、伴随扩散蠕变的晶界滑移机理、位错蠕变/滑移机理、液相协调机理、动态再结晶机理、晶粒群滑移机理和空洞连接协调机制。并针对低成本发展铝合金超塑性研究的迫切性,展望了粗晶材料的应用前景。指出了除大晶粒外,高应变速率和低温条件下的超塑性也是目前铝合金变形研究的方向。

Basic characteristics of superplasticity of coarse-grained aluminum alloys at home and abroad were described.The superplastic deformation mechanism of coarse-grained aluminum alloy was classified and summarized,which mainly included diffusional creep mechanism,grain boundary slip mechanism with diffusion creep,dislocation slip/creep mechanism,liquid phase regulation mechanism,dynamic recrystallization mechanism,cooperative grain boundary sliding mechanism and cavities growth mechanism.In view of urgency of developing superplasticity of aluminum alloy at low cost,application of coarse-grained materials was forecasted.It was pointed out that in addition to large grains,superplasticity under high strain rate and low temperature condition was also the current research direction of aluminum alloy deformation.