摘要
本文从两种Al—zn—Mg—Zr准固溶体合金材料在超塑变形中的行为差异入手,采用光学金相分析、扫描电镜断口分析和透射电镜位错组态度观察相结合的研究手段,分析了材料中位错运动的难易程度和材料微观应变与应变强化平断能力的对应关系。本文的实验结果表明:晶内滑移是适应晶界滑动的重要微观机制之一,它与晶界扩散、晶粒旋转等微观适应机制相配合协调变形;m值的大小是衡量材料微观适应能力强弱的综合指标。
In this paper, the correlation between dislocation activities and equilibrium ability between microplastic strain and strain hardening of the materials hes been analysed with the help of metallographic examinations and observations of fracture surface and dislocation state through an electronscanning microscope according to the behavior differences between two Al-Zn-Mg-Zr quasi-solid solution alloys in superplastic flow. It is proven that slipping in grains is one of the improtant microaccomodarions, adapted to the grain boundary slipping. It together with the grain boundary diffusion and grain rotations are the microaccomodaror during the superplastic formation of Al-Zn-Mg-Zr alloys. Material's m is also a synthetic parameter dependent on the microaccomodation abilities.
关键词
金属材料
超塑性
晶内滑移
aluminium alloys
superplasticity
slipping in grains
