Different aging behaviors at surface layer and central region of a die-casting A380 alloy during heat treatment

Zi-hao Yuan; Zhi-peng Guo; Shou-mei Xiong

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Different aging behaviors at surface layer and central region of a die-casting A380 alloy during heat treatment

机译：压铸A380合金在热处理过程中在表面层和中心区域的不同时效行为

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Microstructural and hardness evolutions of a vacuum-assistant die-cast A380 (Al-8.67wt.%Si-3.27wt.%Cu) alloy during heat treatment were investigated. Isothermal DSC test at 200 °C revealed that the precipitation reaction in the surface layer was faster than that in the central region. This corresponded with the hardness evolution that the surface layer hardened faster. The hardness increment in the surface layer was higher than that in the central region. Further experimental evidences indicated that the differences were due to the different amounts of heterogeneous nucleation sites for precipitation in the two parts. The influence of the characteristic as-cast microstructure on the artificial aging process is analyzed and discussed in detail.

机译：研究了真空辅助压铸A380（Al-8.67wt。％Si-3.27wt。％Cu）合金在热处理过程中的组织和硬度变化。在200°C下的等温DSC测试表明，表层的沉淀反应比中心区域的沉淀反应快。这与表面层硬化较快的硬度演变相对应。表层的硬度增量高于中心区域的硬度增量。进一步的实验证据表明，差异是由于两部分沉淀的异质成核位点数量不同所致。分析并讨论了特征铸态显微组织对人工时效过程的影响。

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《China Foundry》 |2017年第6期|共页
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Zi-hao Yuan; Zhi-peng Guo; Shou-mei Xiong;
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Different aging behaviors at surface layer and central region of a die-casting A380 alloy during heat treatment

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