Effect of magnesium on dispersoid strengthening of Al-Mn-Mg-Si(3xxx) alloys  

镁对Al-Mn-Mg-Si(3xxx)合金弥散相强化作用的影响（英文）

作　　者：李震 张展 X-Grant GHEN 

机构地区：[1]Department of Applied Sciences, University of Québec at Chicoutimi, 555 boul. de l’Université

出　　处：《Transactions of Nonferrous Metals Society of China》2016年第11期2793-2799,共7页中国有色金属学报（英文版）

基　　金：the financial support of the Natural Sciences and Engineering Research Council of Canada (NSERC);Rio Tinto Aluminum through the NSERC Industry Research Chair in the Metallurgy of Aluminum Transformation at University of Quebec at Chicoutimi

摘　　要：The effects of magnesium addition on the dispersoid precipitation as well as mechanical properties of 3xxx alloys wereinvestigated. The microstructures in as-cast and heat-treated conditions were evaluated by optical microscopy and transmissionelectron microscopy. The results reveal that Mg has a strong influence on the distribution and volume fraction of dispersoids duringprecipitation heat treatment. The microhardness and yield strength at ambient temperature increase with increasing Mg content. Thesolid solution and dispersoid strengthening mechanisms of materials after heat treatment are quantitatively analyzed. Dispersoidstrengthening for the alloys is the predominant strengthening mechanism after precipitation heat treatment. An analytical model isintroduced to predict the evolution of ambient-temperature yield strength.研究3xxx系合金中Mg对弥散相析出行为和力学性能的影响。通过光学显微镜和透射电子显微镜对铸造组织和热处理后的材料组织进行系统分析。结果显示:在弥散相析出过程中,合金中镁含量对弥散相的分布和体积分数有很大影响。室温下显微硬度和屈服强度随着镁含量的增加而增加。对热处理后的材料固溶强化机制和弥散强化机制进行量化分析。在经过热处理后的合金中,弥散相强化为主要的强化机制。提出了一个数学模型对材料在室温下的屈服强度进行预测。

关 键 词：aluminum alloy Mg dispersoid strengthening solid solution strengthening microstructure characterization mechanicalproperties 

分 类 号：TG146.21[一般工业技术—材料科学与工程]