Combined effect of pre-aging and Ag/Cu addition on the natural aging and bake hardening in Al-Mg-Si alloys
Combined effect of pre-aging and Ag/Cu addition on the natural aging and bake hardening in Al-Mg-Si alloys
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DOI：
10.1016/j.pnsc.2018.04.007
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
Y. Weng;Z. Jia;L. Ding;Man Liu;Xiaozhi Wu;Qing Liu
中科院分区：
文献类型：
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作者：
Y. Weng;Z. Jia;L. Ding;Man Liu;Xiaozhi Wu;Qing Liu
采用维氏硬度计、拉伸试验、原子探针和透射电镜研究了预时效和Ag/Cu对Al-Mg-Si合金自然时效和烘烤硬化的联合作用。结果表明，Ag和Cu的加入可进一步增强预时效对Al-Mg-Si合金烘烤硬化的促进作用。虽然单独添加Ag/Cu的预时效合金具有较高的烤漆硬度，但由于预时效期间有效地形成簇（2），T4 P回火的硬度相对较高。而预时效加Ag-Cu合金具有较低的T4 P回火硬度和较高的烘烤硬化响应。Ag/Cu原子和Mg原子之间的强相互作用能是促进团簇和沉淀过程的原因。烤漆处理后，大部分Ag原子优先聚集在β″/α-Al基体界面，而Cu原子进入β″内部，导致析出相内部结构无序。
The combined effect of pre-aging and Ag/Cu addition on natural aging and bake hardening in Al-Mg-Si alloys were studied by Vickers microhardness measurement, tensile test, atom probe tomography and transmission electron microscopy. The results showed that Ag and/or Cu addition could further enhance the positive effect of pre-aging on bake hardening for Al-Mg-Si alloys. Although the pre-aged alloys with individual Ag/Cu addition had higher paint bake hardness, the hardness in T4P temper was relatively high due to effectively forming of Cluster(2) during pre-aging. While the pre-aged Ag-Cu-added alloy had low T4P temper hardness and higher bake hardening response. The strong interaction energies between Ag/Cu atoms and Mg atoms were responsible for the facilitated clustering and precipitation processes. After paint bake treatment, most of Ag atoms accumulated preferentially at β″/α-Al matrix interface, while Cu atoms entered into the interior of β″resulting in disordered structure within the precipitate.