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首页> 外文会议>2006 BIMW >Study on Microstructural Evolution and Age Hardening in High-purity Al-Cu-Mg-Ag Alloy
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Study on Microstructural Evolution and Age Hardening in High-purity Al-Cu-Mg-Ag Alloy

机译：高纯Al-Cu-Mg-Ag合金的组织演变和时效强化研究

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摘要

By tensile test and transmission electron microscopy analysis, microstructural evolution and age hardening in an experimental high-purity Al-Cu-Mg-Ag alloy were investigated during a long period of ageing time. The results show that the experimental alloy has strong age-hardening response that the alloy strength rapidly increases to almost peak-aged condition after aged for only 2 hours. Ω phase and θ' phase control the hardening effects and grow independently as the ageing time prolonged. At the same time, fine secondary-precipitated θ' phase nucleates and grows near dislocations at fine laths of Ω phase which is resulted from the high misfit strain near Ω/α interface. These new hardening precipitates compensate the strength loss due to the primary-precipitated Ω phase and θ' phase coarsening. Thus the alloy strength is only a little decrease after ageing for 50 hours at elevated temperature.
机译：通过拉伸试验和透射电子显微镜分析，研究了在高时效时间段内实验性高纯度Al-Cu-Mg-Ag合金的组织演变和时效硬化。结果表明，实验合金具有很强的时效硬化反应，仅时效2小时后，合金强度迅速提高到接近峰值时效状态。 Ω相和θ'相控制淬火效果，并随着时效时间的延长而独立增长。同时，细的二次析出的θ'相成核并在Ω相的细条形位错附近生长，这是由于Ω/α界面附近的高失配应变导致的。这些新的硬化沉淀物补偿了由于初次沉淀的Ω相和θ'相变粗造成的强度损失。因此，在高温下老化50小时后，合金强度仅略微降低。

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