不同尺寸粒子对Al-Mg-Si-Cu系合金组织、织构和力学性能的影响

发布时间：2018-03-27 17:04

本文选题：Al-Mg-Si-Cu合金　切入点：粒子　出处：《金属学报》2015年02期

【摘要】：通过拉伸实验,OM,SEM,TEM观察以及EBSD测试等手段研究了不同尺寸粒子对Al-Mg-Si-Cu系合金板材力学性能、组织和织构的影响规律.结果表明,随着溶质元素浓度的增加,合金屈服强度和抗拉强度均不断增加,但是延伸率却略有降低,且3个方向存在一定差异.此外,合金的平均塑性应变比rˉ也随溶质元素浓度增加而增加.3种合金基体内的不同尺寸粒子主要为Mg2Si,Al15Mn3Si2和a-Al(Fe,Mn)Si富铁相,这些粒子尺寸和浓度搭配合理不仅可以诱发粒子刺激形核效应(particle stimulated nucleation,简称PSN),而且可有效抑制晶粒长大,最终使得合金固溶时形成大量细小再结晶晶粒,而织构组分以旋转立方织构CubeND18,Goss织构{011}100,P{011}122和Cu{112}111为主.此外,根据合金成分、热加工工艺以及显微组织间的定量关系提出了不同尺寸粒子影响再结晶形核和长大过程的模型示意图.
[Abstract]:The effects of particles of different sizes on the mechanical properties, microstructure and texture of Al-Mg-Si-Cu alloy sheet were studied by means of TEM observation and EBSD test. The results showed that with the increase of the concentration of solute elements, the mechanical properties, microstructure and texture of Al-Mg-Si-Cu alloy plates were studied. The yield strength and tensile strength of the alloy are both increasing, but the elongation of the alloy decreases slightly, and there are some differences in the three directions. The average plastic strain ratio (r) of the alloy also increases with the increase of solute concentration. 3 kinds of particles of different sizes in the alloy matrix are mainly Mg2Si-Al15Mn3Si2 and a-Al-FeMn-Si-rich iron phase. The reasonable size and concentration of these particles can not only induce particle nucleation and particle stimulated nucleation, but also inhibit grain growth effectively, resulting in the formation of a large number of fine recrystallized grains when the alloy is dissolved in solid solution. The main texture components are rotational cubic texture CubeND18 Goss texture {011} 100p {011} 122 and Cu {112} 111. In addition, according to the quantitative relationship among alloy composition, hot working technology and microstructure, a model diagram of the effect of different sizes of particles on recrystallization nucleation and growth process is presented.
【作者单位】：北京科技大学新金属材料国家重点实验室;
【基金】：国家高技术研究发展计划项目2013AA032403 国家自然科学基金项目51301016 北京市青年“英才”计划项目YETP0409资助~~
【分类号】：TG146.21

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