工业纯铝微塑性变形行为研究

Microplastic Deformation Behaviour of Annealed Commercial Pare Aluminium

本文通过微塑性变形的测试与位错结构的微观分析,研究了退火态工业纯铝的微塑性变形规律与机理。结果表明,微塑性变形Ⅰ阶段具有相当低的硬化指数,它对应于晶界对位错的吸收及晶内位错的单滑移;Ⅱ阶段具有高的硬化指数,是整个晶粒多滑移的结果,同时晶界对位错的吸收影响着此阶段硬化程度的强弱。

By means of measurement of microplastic deformation behaviour and microscopic analysis of dislocation structure, the regularity and mechanism of the microplastic deformation of annealed commercial pure aluminium were investigated. The results show that stage I of microplastic deformation, with rather low hardening exponent, corresponds to dislocation annihilation in grain boundary and single glide within grains, and stage Ⅱ, with high hardening exponent, is the result of multiple glide in whole grain. In addition, dislocation annihilation in grain boundary affects the hardening degree of this stage.