Ag对Al-5.3Cu-0.8Mg合金铸态组织与时效硬化行为的影响

发布时间：2018-06-21 15:11

本文选题：Al-Cu-Mg-Ag合金 + Ag添加　；参考：《材料热处理学报》2015年12期

【摘要】：采用金相显微分析技术、布氏硬度、XRD分析、室温与高温拉伸性能测试等方法,研究了Ag对Al-5.3Cu-0.8Mg合金铸态组织与时效硬化行为的影响。研究表明:Ag对合金铸态组织有细化作用,随着Ag含量的增加,枝晶得到细化;Ag添加缩短了合金的峰时效时间,其原因在于Ag原子提高了合金析出相的形核速率,进而加速了析出相的形成;随着Ag含量的增加,合金的硬度先增加后降低,含0.8%Ag的合金峰时效硬度最大;适量的Ag可以促进合金中Ω相的形成,过量的Ag将会抑制Ω相的形成;随着Ag含量的增加,合金的强度和热稳定性先升高后降低,当Ag含量为0.8%时,其强度和热稳定性均达到峰值;Ag提高合金强度与热稳定性的原因在于析出了热稳定性和强化作用比θ'、S'相更强的Ω相。
[Abstract]:The effect of Ag on the as-cast microstructure and aging hardening behavior of Al-5.3Cu-0.8Mg alloy was studied by means of metallographic microanalysis, Brinell hardness XRD analysis and tensile test at room and high temperature. The results show that the as-cast microstructure of the alloy is refined with the increase of Ag content. With the increase of Ag content, the peak aging time of the alloy can be shortened with the addition of silver. The reason is that the Ag atom increases the nucleation rate of the precipitated phase of the alloy. With the increase of Ag content, the hardness of alloy increases first and then decreases, and the peak aging hardness of alloy containing 0.8%Ag is the largest, the formation of 惟 phase in alloy can be promoted by appropriate amount of Ag, and the formation of 惟 phase will be inhibited by excessive Ag. With the increase of Ag content, the strength and thermal stability of the alloy first increased and then decreased. The reason that the strength and thermal stability of the alloy reach the peak value of Ag is that the 惟 phase with stronger thermal stability and strengthening effect is precipitated.
【作者单位】：辽宁工业大学材料科学与工程学院;
【基金】：辽宁省教育厅科学研究项目(L2015234)
【分类号】：TG146.21

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