Thermodynamics Analysis of Microstructure of AlSi7Mg Alloy

Wan Nong~1 Dong Jianxin~2 Xie Xishan~2

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Thermodynamics Analysis of Microstructure of AlSi7Mg Alloy
Issue 6, Pages: 378-380(2005)
Published： 2005 ，
DOI：

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[1]宛农,董建新,谢锡善.AlSi7 Mg系铝合金组织的热力学分析[J].特种铸造及有色合金,2005(06):378-380+320.

Wan Nong~1 Dong Jianxin~2 Xie Xishan~2. Thermodynamics Analysis of Microstructure of AlSi7Mg Alloy. [J]. Special Casting & Nonferrous Alloys (6):378-380(2005)
[1]宛农,董建新,谢锡善.AlSi7 Mg系铝合金组织的热力学分析[J].特种铸造及有色合金,2005(06):378-380+320. DOI：

Wan Nong~1 Dong Jianxin~2 Xie Xishan~2. Thermodynamics Analysis of Microstructure of AlSi7Mg Alloy. [J]. Special Casting & Nonferrous Alloys (6):378-380(2005) DOI：

摘要

运用Thermo Calc热力学软件对平衡条件下AlSi7Mg系铝合金组织进行了定量计算

研究了化学成分和温度两因素的影响规律。结果表明

AlSi7Mg系铝合金中Mg2Si强化相开始析出温度及数量主要取决于镁含量

增加镁含量可以提高Mg2Si强化相数量及其析出温度;200℃温度以上时效会导致Mg2Si强化相数量急剧下降及其强化效应的衰退

热力学计算确定的最佳固溶温度和时效温度分别在525～550℃和150～200℃之间

其结果与现有试验数据基本上相符。

Abstract

Quantitative calculation for microstructure of AlSi7Mg alloy under conservation condition was conducted by a thermo-calc thermodynamic software.Effects of chemical composition and temperature on the microstructure of the alloy were researched.The results showed that increase of Mg content can improve the amount and precipitated temperature of Mg

Si enhancement phase due to the fact that the precipitated temperature and amounts of Mg

Si enhancement phase are mainly dependent on Mg content.Amounts and enhanced effects of Mg

Si enhancement phase can be remarkably decreased with aging at over 200 ℃.The optimized solid solution temperature and aging temperature are 525～550 ℃ and 150～200 ℃ respectively through the thermo-calc software calculation

which is well in agreement with the existing experimental data.