Mohamed Farghalli A
Department of Chemical Engineering and Materials Science, University of California, Irvine, CA 92697, USA.
Materials (Basel). 2011 Jul 1;4(7):1194-1223. doi: 10.3390/ma4061194.
Micrograin Superplasticity refers to the ability of fine-grained materials (1 µm < d < 10 μm, where d is the grain size) to exhibit extensive neck-free elongations during deformation at elevated temperatures. Over the past three decades, good progress has been made in rationalizing this phenomenon. The present paper provides a brief review on this progress in several areas that have been related to: (a) the mechanical characteristics of micrograin superplasticity and their origin; (b) the effect of impurity content and type on deformation behavior, boundary sliding, and cavitation during superplastic deformation;
微晶超塑性是指细晶材料（1μm＜d＜10μm，其中d为晶粒尺寸）在高温变形过程中表现出无明显缩颈的大伸长率的能力。在过去三十年里，在合理解释这一现象方面取得了显著进展。本文简要综述了在以下几个相关领域取得的进展：（a）微晶超塑性的力学特性及其起源；（b）杂质含量和类型对超塑性变形过程中的变形行为、晶界滑动和空化的影响。
