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。
The effects of magnesium addition on the dispersoid precipitation as well as mechanical properties of 3xxx alloys were investigated. The microstructures in as-cast and heat-treated conditions were evaluated by optical microscopy and transmission electron microscopy. The results reveal that Mg has a strong influence on the distribution and volume fraction of dispersoids during precipitation heat treatment. The microhardness and yield strength at ambient temperature increase with increasing Mg content. The solid solution and dispersoid strengthening mechanisms of materials after heat treatment are quantitatively analyzed. Dispersoid strengthening for the alloys is the predominant strengthening mechanism after precipitation heat treatment. An analytical model is introduced to predict the evolution of ambient-temperature yield strength.
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