(1. 苏州有色金属研究院 材料工艺研究所, 苏州 215026;
2. 中南大学 材料科学与工程学院, 长沙 410083)
摘 要: 利用Jmat-Pro热力学相图计算软件模拟Al-Zn-Mg-Cu合金的凝固路径以及该合金中MgZn2、Al2CuMg、Al2Cu和Al2Mg3Zn3相生成数量和生成温度随Zn、Mg和Cu含量变化的关系曲线；分析实验合金的微观组织。检测结果与热力学计算结果一致。热力学计算结果表明，在7150合金的成分优化过程中，当Zn、Mg和Cu元素的质量分数分别为6.4%~6.9%、2.3%~2.5%和2.0%~2.2%时，合金凝固组织中MgZn2相的生成数量可达4.5%~6.0%，同时，Al2CuMg相的生成数量可控制在0.5%以下。
关键字: Al-Zn-Mg-Cu合金；热力学计算；成分优化；微观组织
thermodynamic calculation method
（1. Institute of Materials Science and Engineering, Suzhou Institute Limited for Nonferrous Metals, Suzhou 215026, China;
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The solidification paths of Al-Zn-Mg-Cu alloy and variation of MgZn2, Al2CuMg, Al2Cu, Al2Mg3Zn3 phases amount and crystallization temperatures with Zn, Mg and Cu contents were studied by thermodynamic calculation software Jmat-Pro. The microstructures of the experimental alloy were analyzed, which show that the microstructural analysis is in agreement with the thermodynamic prediction. The thermodynamic calculation results indicate that, in the mass fraction ranges of Zn of 6.4−6.9%, Mg of 2.3%−2.5%, Cu of 2.0−2.2%, the content of MgZn2 phase can be up to 4.5%−6.0% and that of Al2CuMg phase can be lower than 0.5% during the constituent optimization of 7150 alloy.
Key words: Al-Zn-Mg-Cu alloy; thermodynamic calculation; constituent optimization; microstructure
