首页|Al?Si?Mg?Er合金的热稳定性和析出相的显微组织

Al?Si?Mg?Er合金的热稳定性和析出相的显微组织

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采用显微硬度计和透射电镜研究Er元素对热处理Al−Si−Mg合金显微硬度和析出行为的影响.作为对照,同时研究人工时效前引入自然时效对合金硬度和析出行为的影响.研究结果表明,过时效Al−Si−Mg−Er合金的热稳定性与析出相的平均尺寸密切相关.未引入自然时效时,Al−Si−Mg−Er合金中 β'相的平均尺寸小于Al−Si−Mg合金中 β'相的平均尺寸,且其尺寸分布更加集中.然而,当在人工时效之前引入自然时效时,Al−Si−Mg−Er合金中析出相的平均尺寸和分布均与Al−Si−Mg合金的类似.此时,两种合金具有相似的力学性能.此外,详细讨论Er对合金中析出相析出动力学的影响,来解释上述现象.
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 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.

Al−Si−Mg alloyErnatural agingprecipitatethermal stability

何忆、席海辉、明文全、邵秦秦、沈若涵、赖玉香、伍翠兰、陈江华

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湖南大学材料科学与工程学院,长沙 410082

Al−Si−Mg合金 Er 自然时效 析出相 热稳定性

National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

2016YFB03008011190409351831004516710825147106711427806

2021

10.1016/S1003-6326(20)65474-7

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(1)
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