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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Double-peak ageing behavior of Mg-2Dy-0.5Zn alloy
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Double-peak ageing behavior of Mg-2Dy-0.5Zn alloy

机译：Mg-2Dy-0.5Zn合金的双峰时效行为

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摘要

Ageing behavior of Mg-2Dy-0.5Zn alloy was investigated during isothermal ageing at 180 °C. Two significant ageing peaks were observed at 36 h and 80 h, respectively. Examination of microstructure evolution during ageing revealed that 14H long period stacking ordered (LPSO) phase forms in the a-Mg matrix and its volume fraction increases, (Mg, Zn)_xDy particle phases precipitate and their size, distribution and amount vary, as ageing time increases. The LPSO strengthening and the precipitation strengthening are two main mechanisms responsible for the double-peak ageing behavior observed for the Mg-2Dy-0.5Zn alloy. The first ageing peak is mainly attributed to the precipitation strengthening of a large amount of the fine (Mg, Zn)_xDy particle phases. The second ageing peak arises mainly from the LPSO strengthening of a high volume fraction of the 14H LPSO phase.
机译：研究了Mg-2Dy-0.5Zn合金在180°C等温时效的时效行为。在36小时和80小时分别观察到两个明显的老化峰。老化过程中微观结构演变的研究表明，α-Mg基质中14H长期堆积有序（LPSO）相形成，其体积分数增加，（Mg，Zn）_xDy颗粒相沉淀，并且其尺寸，分布和数量随老化而变化时间增加了。 LPSO强化和沉淀强化是造成Mg-2Dy-0.5Zn合金双峰时效行为的两个主要机理。第一老化峰主要归因于大量的（Mg，Zn）_xDy细颗粒相的沉淀强化。第二个老化峰主要来自14H LPSO相的高体积分数的LPSO强化。

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