摘要
Aluminium alloy is one of the earliest and most widely used superplastic materials.The objective of this work is to review the scientific advances in superplastic Al alloys.Particularly,the emphasis is placed on the microstructural evolution and deformation mechanisms of Al alloys during superplastic deformation.The evolution of grain structure,texture,secondary phase,and cavities during superplastic flow in typical superplastic Al alloys is discussed in detail.The quantitative evaluation of different deformation mechanisms based on the focus ion beam(FIB)-assisted surface study provides new insights into the superplasticity of Al alloys.The main features,such as grain boundary sliding,intragranular dislocation slip,and diffusion creep can be observed intuitively and analyzed quantitatively.This study provides some reference for the research of superplastic deformation mechanism and the development of superplastic Al alloys.
铝合金是最早开始使用且应用最广泛的超塑性材料之一。综述了超塑性铝合金的研究进展,重点总结了铝合金在超塑性变形过程中的显微组织演变和变形机理,详细讨论了典型超塑性铝合金在超塑性变形过程中晶粒组织、织构、第二相和空洞的演变。基于聚焦离子束(FIB)的表面研究能为不同超塑性变形机制提供定量评估,从而为研究铝合金的超塑性提供新的思路。基于FIB的表面研究可以直观地观察到晶界滑移、晶内位错滑移和扩散蠕变等主要特征,并进行定量分析。本研究可为超塑性变形机理的研究和超塑性铝合金的发展提供一定的参考。
