基于JmatPro对Al-Mg-Si-Cu-La合金析出相及性能的研究

Study on the Precipitated Phase and Properties of Al-Mg-Si-Cu-La Alloy Based on JmatPro

为了进一步探究Cu含量对Al-Mg-Si-Cu-La合金析出相及性能影响,利用材料相图及性能模拟软件JMatPro对Al-Mg-Si-Cu-La合金进行热力学模拟计算,得到不同Cu添加量下的平衡相和亚稳相的含量。结果表明:随着Cu含量的增加,室温下合金的强化β(Mg_(2)Si)相和Q(Al_(5)Cu_(2)Mg_(8)Si_(6))相的含量基本没有变化,θ(Al_(2)Cu)相的含量逐渐增多,亚稳相β′(Mg_(9)Si_(5))相的含量越来越少,θ′(Al_(2)Cu)相和GP区的含量逐渐增多,Q′(Al_(3.8)Mg_(8.6)Si_(7)Cu)相含量先增后减少。合金的力学性能模型表明,增加Cu含量会提高合金的力学性能,当Cu含量为4wt.%时,合金的抗拉强度和硬度均达到最大,但当Cu含量为5wt.%时合金抗拉强度和硬度开始下降。

In order to further explore the influence of Cu content on the precipitated phase and properties of Al-Mg-Si-Cu-La alloy,thermodynamic simulation of Al-Mg-Si-Cu-La alloy was carried out by using material phase diagram and property simulation software JMatPro,and the contents of equilibrium phase and metastable phase were obtained under different Cu addition levels.The results showed that with the increase of Cu content,the content of enhanced β(Mg_(2)Si)phase and Q(Al_(5)Cu_(2)Mg_(8)Si_(6))phase had no change at room temperature,the content of θ(Al_(2)Cu)phase increased gradually,the content of metastable β′(Mg_(9)Si_(5))phase decreased gradually,and the content ofθ′(Al_(2)Cu)phase and GP zone increased gradually.Q′(Al_(3.8)Mg_(8.6)Si_(7)Cu)phase content increased first and then decreased.The mechanical property model of the alloy showed that increasing the Cu content would improve the mechanical properties of the alloy.When the Cu content was 4wt.%,the tensile strength(Rm)and hardness(HV)of the alloy reached the maximum,but when the Cu content was 5wt.%,the tensile strength and hardness of the alloy began to decrease.