(1. 蘇州有色金屬研究院 材料工藝研究所, 蘇州 215026;
2. 中南大學(xué) 材料科學(xué)與工程學(xué)院, 長沙 410083)
摘 要: 利用Jmat-Pro熱力學(xué)相圖計算軟件模擬Al-Zn-Mg-Cu合金的凝固路徑以及該合金中MgZn2、Al2CuMg、Al2Cu和Al2Mg3Zn3相生成數(shù)量和生成溫度隨Zn、Mg和Cu含量變化的關(guān)系曲線；分析實驗合金的微觀組織。檢測結(jié)果與熱力學(xué)計算結(jié)果一致。熱力學(xué)計算結(jié)果表明，在7150合金的成分優(yōu)化過程中，當Zn、Mg和Cu元素的質(zhì)量分數(shù)分別為6.4%~6.9%、2.3%~2.5%和2.0%~2.2%時，合金凝固組織中MgZn2相的生成數(shù)量可達4.5%~6.0%，同時，Al2CuMg相的生成數(shù)量可控制在0.5%以下。
關(guān)鍵字: Al-Zn-Mg-Cu合金；熱力學(xué)計算；成分優(yōu)化；微觀組織
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
