论文部分内容阅读
本文研究了晶粒尺寸对Zn-0.4%Al合金在超塑性变形条件下的力学特性、宏观变形行为及微观变形机构的影响。结果表明:1.Zn-0.4%Al合金的晶粒尺寸在100微米到10微米范围内,在给定试验条件下,σ-d~(1/2)‘关系符合Hall-Petch公式,晶粒尺寸≥35微米时变形机构以孪生为主,20～10微米时以滑移为主;2.晶粒尺寸小于10微米时,Hall-Petch关系式已不适用,随晶粒细化应力下降;3.晶粒尺寸小于5微米时属于超塑性变形区,其中晶粒尺寸为1微米时,晶界滑移在变形中起主导作用,同时结晶学滑移也有重要贡献。
In this paper, the effects of grain size on the mechanical properties, macroscopic deformation behavior and microstructure of Zn-0.4% Al alloy under superplastic deformation were investigated. The results show that: 1.Zn-0.4% Al alloy grain size in the range of 100 microns to 10 microns, under the given test conditions, σ-d ~ (1/2) ’relationship with the Hall-Petch formula, the grain When the size is greater than 35μm, the deformation mechanism is dominated by twins, and the slip is dominated at 20 ~ 10μm. (2) The Hall-Petch relation is not suitable when the grain size is less than 10μm, When the grain size is less than 5 microns, it belongs to the superplastic deformation zone. When the grain size is 1 micron, the grain boundary slip plays a leading role in the deformation and the crystallographic slip also contributes significantly.