A NEW MODEL FOR CAVITY NUCLEATION

来源期刊：中国有色金属学报(英文版)1997年第2期

论文作者：Liu Zhiyi

文章页码：146 - 149

Key words：cavity nucleation; superplastic deformation; dynamic recrystallization

Abstract: By correct evaluation of the action of interior stress in superplastic deformation, it was believed that interior stress was the driving force for voids aggregation when deformed at high temperature. Based on this principle, a new critical radius model for cavity nucleation was deduced, which points out that critical radius for cavity nucleation is function of exerted stress and grain diameter. The model can be successfully applied to explain the phenomenon that cavity diameter and fraction decreased with grains refining at initial stage in superplastic deformation of Al Li alloys whose grains refined by dynamic recrystallization.