蠕变时效制度对回归态Al-Zn-Mg-Cu合金析出相的影响（英文）

发布时间：2018-02-14 05:50

本文关键词： 应力时效回归处理析出相 Al-Zn-Mg-Cu合金　出处：《稀有金属材料与工程》2017年02期 　论文类型：期刊论文

【摘要】：基于回归再时效(RRA)工艺,提出一种新的回归-应力时效制度(RSA)用于Al-Zn-Mg-Cu合金。系统研究了应力时效制度(时效时间和应力)对回归态Al-Zn-Mg-Cu合金析出相的影响。透射电镜(TEM)观察结果表明:在回归处理后,合金内部存在大量的基体析出相(MPts)和轻微不连续的晶界析出相(GBPsi时效时间和应力对回归态合金析出相的影响十分显著。随着时间和应力的增加,基体析出相的尺寸增加而密度减少;同时,晶界析出相的尺寸、间距和无沉淀的宽度也增加。相比于回归再时效工艺,回归-应力时效工艺使得晶内析出相尺寸增加,无沉淀析出带变窄且晶界析出相更不连续。
[Abstract]:Based on the regression reaging (RRA) process, A new regression stress aging system (rsa) was proposed for Al-Zn-Mg-Cu alloys. The effect of stress aging (aging time and stress) on precipitated phase of Al-Zn-Mg-Cu alloy was studied systematically. The results of transmission electron microscopy (TEM) showed that: after regression treatment, the precipitation phase of Al-Zn-Mg-Cu alloy was studied. There are a large number of matrix precipitated phases (MPtss) and slightly discontinuous grain boundary precipitates in the alloy. The aging time and stress of GBPsi have a significant effect on the precipitated phase of the regress alloy with the increase of time and stress. At the same time, the size, spacing and width of precipitated phase at grain boundary also increased. Compared with the process of regression reaging, the size of precipitated phase increased by the process of regression stress aging. The precipitation band without precipitation becomes narrower and the precipitate phase at grain boundary is more discontinuous.
【作者单位】：中南大学;高性能复杂制造国家重点实验室;有色金属先进结构材料与制造协同创新中心;
【基金】：National Natural Science Foundation of China(51235010) National Key Basic Research Development Program of China(“973”Project)(2014CB046600)
【分类号】：TG146.21

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