Ageing Behavior of Al8Si0.4Mg Cast Alloy

Wang Guiqing

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Ageing Behavior of Al8Si0.4Mg Cast Alloy
Issue 2, Pages: 1-4(2004)
Published： 2004 ，
DOI：

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[1]王桂青,,,,,,,,,边秀房.铸造Al8Si0.4Mg合金时效行为研究[J].特种铸造及有色合金,2004(02):1-4+1.

Wang Guiqing. Ageing Behavior of Al8Si0.4Mg Cast Alloy. [J]. Special Casting & Nonferrous Alloys (2):1-4(2004)
[1]王桂青,,,,,,,,,边秀房.铸造Al8Si0.4Mg合金时效行为研究[J].特种铸造及有色合金,2004(02):1-4+1. DOI：

Wang Guiqing. Ageing Behavior of Al8Si0.4Mg Cast Alloy. [J]. Special Casting & Nonferrous Alloys (2):1-4(2004) DOI：

摘要

利用硬度测定、差热扫描量热分析（DSC）、电子探针微区成分分析和透射电子显微分析（TEM）技术研究了铸造Al8Si0 .4Mg合金的铸态时效及固溶淬火时效（T6）行为。硬度测定结果表明 :Al8Si0 .4Mg合金具有明显的铸态时效硬化效果

其铸态时效峰值硬度仅比T6状态硬度值低 6HV。冷却速度对合金时效没有明显的影响。DSC和TEM分析结果表明 :两种时效状态下合金的时效硬化均是过渡相 β″和 β′相析出对基体的强化。对合金在两种时效状态下析出相的分布及硬度均匀化系数进行了分析讨论

Abstract

The age behavior of both as-cast and solid solution tr eated （T6） Al8Si0.4Mg alloys was studied by hardness measurement

differential s canning calorimetry （DSC）

electron probe micro analysis and TEM. Hardness measu rement indicated that as-cast alloy exhibited remarkable age harderning effect

having microhardness peak value lower than T6 treated alloy only by 6 HV. No ob vious effect of cooling rate on age hardening appeared. DSC and TEM analysis results showed that the age hardening for both alloys was attributed to the precipitatio n of metastable β″ and β′phases to strengthen the matrix. The distribution o f precipitated phases and the homogeneity coefficient of mciro-hardnessg for bo th alloys have been discussed.