微量铈对7085铝合金组织和性能影响

发布时间：2018-07-01 11:56

本文选题：铝合金 + 稀土　；参考：《中国稀土学报》2017年04期

【摘要】：将微量Ce添加到7085铝合金中,采用金相分析、硬度测试、力学性能拉伸、断口扫描、能谱分析等手段,研究了添加Ce后对7085铝合金铸态组织及力学性能的影响。结果表明:添加Ce后,Ce元素在固液界面前沿富集,出现成分过冷,使二次枝晶间距缩小,细化铸态结晶组织;Ce的添加,Zn和Mg元素在晶界偏聚情况不再明显,由晶界向基体转移,使基体中合金元素增多,造成畸变能和应变能增加,为弥散相析出提供了能量条件;添加Ce后,合金抗拉强度变化不大,塑性明显提高,提高了7085铝合金的综合性能。
[Abstract]:The effect of ce addition on the as-cast microstructure and mechanical properties of 7085 aluminum alloy was studied by means of metallographic analysis, hardness test, tensile strength, fracture scanning and energy spectrum analysis. The results show that after the addition of ce, the element of ce is enriched at the front of solid-liquid interface, the composition is supercooled, the secondary dendrite spacing is reduced, and the addition of Zn and mg elements to refine the as-cast crystal structure is no longer obvious at the grain boundary, but is transferred from the grain boundary to the matrix. With the addition of ce, the tensile strength of the alloy increases little and the plasticity of the alloy increases obviously, and the comprehensive properties of 7085 aluminum alloy are improved.
【作者单位】：烟台南山学院工学院材料系;山东南山铝业股份有限公司国家铝合金压力加工工程技术研究中心;
【基金】：山东省科技发展计划项目(2014GGX102006) 山东省高等学校科研计划项目(J16LA56) 山东省高等学校优势学科人才团队培育计划资助
【分类号】：TG146.21

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