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首页> 外文期刊>Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing >Precipitates in a Mg-Zn-Y alloy reinforced by an icosahedral quasicrystalline phase
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Precipitates in a Mg-Zn-Y alloy reinforced by an icosahedral quasicrystalline phase

机译：二十面体准晶相增强的Mg-Zn-Y合金中的沉淀

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摘要

The precipitation behavior under various heat treatment conditions in the as-cast and hot-rolled Mg-Zn-Y alloy has been investigated. While MgZn_2 precipitates are distributed in the alpha-Mg matrix at 190 deg C, in the temperature range of 350-420 deg C, polygon-shaped icosahedral phase (I-phase) precipitates are mainly formed. The precipitated I-phase is mostly found to be localized near the eutectic region in the as-cast ingot, but it is randomly distributed throughout the refined alpha-Mg grains formed by dynamic recrystallization during the hot-rolling processes in the sheet. The I-phase precipitates have no specific orientation relationship with the alpha-Mg matrix and do not coarsen at high temperatures. An increase of the hardness value by I-phase precipitates is less significant than that by MgZn_2 precipitates due to their relatively low number density and near-spherical morphology.
机译：研究了铸态和热轧Mg-Zn-Y合金在各种热处理条件下的析出行为。 MgZn_2析出物在190℃分布在α-Mg基质中，而在350-420℃的温度范围内，主要形成了多边形的二十面体相（I相）析出物。析出的I相主要位于铸锭中的共晶区域附近，但它在板坯热轧过程中通过动态再结晶形成的精制α-Mg晶粒中随机分布。 I相沉淀物与α-Mg基质没有特定的取向关系，并且在高温下不会粗化。 I相沉淀物的硬度值增加不及MgZn_2沉淀物的硬度值增加显着，这是因为它们的数字密度相对较低且接近球形。

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