Low-alloy-correlated reversal of the precipitation sequence in Al-Mg-Si alloys
Low-alloy-correlated reversal of the precipitation sequence in Al-Mg-Si alloys
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Al-Mg-Si 合金中与低合金相关的沉淀顺序反转
DOI：
10.1016/j.jallcom.2017.01.095
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发表时间：
2017
影响因子：
6.2
通讯作者：
Chen J. H.
中科院分区：
文献类型：
--
作者：
Lai Y. X.;Jiang B. C.;Liu C. H.;Chen Z. K.;Wu C. L.;Chen J. H.
众所周知，在180 °C或更高温度下时效时，Al-Mg-Si合金中的沉淀顺序应（大致）如下：过饱和固溶体→ β″→ β ′（/B ′/U 2），其中β″-沉淀之后形成β ′-沉淀。本文报道了贫Al-Mg-Si合金在180° C时效后立即形成β'（/B'/U2）相。然而，应用自然时效可以逐渐恢复沉淀序列，并且最终β″-沉淀物变得比β ′-沉淀物占优势。这表明沉淀序列与合金含量和自然时效簇密切相关。
As commonly known, upon ageing at 180 °C or above, the precipitation sequence in Al-Mg-Si alloys shall be (roughly) as follows: supersaturated solid solution→ β″→ β' (/B'/U2), where the β'-precipitates form after the β″-precipitates. Here we report that in a lean Al-Mg-Si alloy the β' (/B'/U2)-precipitates can form immediately upon 180°C-ageing. Nevertheless, applying natural ageing can gradually recover the precipitation sequence and eventually the β″-precipitates become dominant over β'-precipitates. This indicates that the precipitation sequence is strongly correlated with alloy-content and natural-ageing clusters.