Thermal stability and precipitate microstructures of Al−Si−Mg−Er alloy

The effect of Er on the microhardness and precipitation behavior of the heat-treated Al−Si−Mg alloy was investigated by microhardness tester and TEM. As a comparison, the influence of natural aging was also studied. It is shown that the thermal stability of the over-aged Al−Si−Mg−Er alloy is highly...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2021-01, Vol.31 (1), p.1-10
Main Authors: HE, Yi, XI, Hai-hui, MING, Wen-quan, SHAO, Qin-qin, SHEN, Ruo-han, LAI, Yu-xiang, WU, Cui-lan, CHEN, Jiang-hua
Format: Article
Language:English
Subjects:
Al−Si−Mg alloy
natural aging
precipitate
thermal stability
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Summary:The effect of Er on the microhardness and precipitation behavior of the heat-treated Al−Si−Mg alloy was investigated by microhardness tester and TEM. As a comparison, the influence of natural aging was also studied. It is shown that the thermal stability of the over-aged Al−Si−Mg−Er alloy is highly related to the average size of the precipitates. The average size of β’’ precipitates in Al−Si−Mg−Er alloy is smaller than that in Al−Si−Mg alloy, and the distribution is more localized under condition of without introducing natural aging. However, when natural aging is introduced before artificial aging, the Al−Si−Mg−Er alloy has similar average size and distribution of precipitates with the Al−Si−Mg alloy, resulting in similar mechanical properties. The effect of Er on the precipitation kinetics in the alloy was also discussed in detail to explain these phenomena.
ISSN:1003-6326
DOI:10.1016/S1003-6326(20)65474-7