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基于相图计算的新型 Al-Mg-Si-Cu-Mn合金设计
Novel Al-Mg-Si-Cu-Mn Alloy Design Based on Phase Diagram Calculations
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- DOI:
- 作者:
- 高辰祺，田璐莎，李建平
GAO Chenqi, TIAN Lusha, LI Jianping
- 作者单位:
- 西安工业大学 材料与化工学院，陕西 西安 710021
School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China
- 关键词:
- 相图计算；铝合金；力学性能；显微组织
phase diagram calculation; aluminium alloy; mechanical properties; microstructure
- 摘要:
- 以相图热力学计算相关原理为基础，计算 了 新 型 Al-Mg-Si-Cu-Mn 合金在 不 同 Mg 含量、不同 Mg/Si 质量比下的相组成 ， 并对合金在铸态下的力学性能进行了模拟 ， 得 到 成 分 为 Al-1.5Mg-1.1Si-0.8Cu-0.2Mn (简记为1.5Mg-1.1Si)和 Al-1.0Mg-1.0Si-0.8Cu-0.2Mn(简记为 1.5Mg-1.1Si)两种铝合金。 采用光学金相显微镜、扫描电镜以及室温拉伸试验，对上述两种不同成分的铝合金进行了显微组织观察和力学性能测试。 结果表明，随着 Mg 含量、Mg/Si 质量比的同时增大，1.5Mg-1.1Si 合金的平均晶粒尺寸为 81.10 μm ，比 1.0Mg-1.0Si 的平均晶粒尺寸减小了 18.5%；1.5Mg-1.1Si合金的最大抗拉强度达到了 177 MPa,相比于 1.0Mg-1.0Si 合金平均提高了 12.5%。 整体上 1.5Mg-1.1Si 合金的力学性能和显微组织得到了一定程度的优化与提高。 同时，模拟计算结果与实验结果得到了相互映证，可以说明相图热力学计算软件 JMatPro 有利于提高合金成分设计的效率。
On the basis of thermodynamic calculations of phase diagrams, the phase composition of a new type ofAl-Mg-Si-Cu-Mn alloy was calculated under different Mg contents and Mg/Si mass ratios, and the mechanical properties ofthe alloy in the as-cast state were simulated. Two aluminium alloys with compositions of Al-1.5Mg-1.1Si-0.8Cu-0.2Mn andAl-1.0Mg-1.0Si-0.8Cu-0.2Mn were obtained. The microstructures and mechanical properties of the two alloys with differentcompositions were observed and tested via optical metallographic microscopy, scanning electron microscopy and roomtemperature tensile tests. The results show that with increasing Mg content and Mg/Si mass ratio, the average grain size ofthe as-cast Al-1.5Mg-1.1Si-0.8Cu-0.2Mn alloy is reduced by 30% compared with that of the as-cast Al-1.0Mg-1.0Si-0.8Cu0.2Mn alloy; the maximum tensile strength of the as-cast Al-1.5Mg-1.1Si-0.8Cu-0.2Mn alloy reaches 177 MPa, which is12.5% greater on average than that of the as-cast Al-1.0Mg-1.0Si-0.8Cu-0.2Mn alloy. Overall, the mechanical propertiesand microstructure of the as-cast Al-1.5Mg-1.1Si-0.8Cu-0.2Mn alloy were optimized and improved to a certain extent.Moreover, the simulation results are consistent with the experimental results, which indicates that the phase diagramthermodynamic calculation software JMatPro is beneficial for improving the efficiency of alloy composition design.