The nano-eutectic in the microstructure of semisolid Mg–6Zn–1Y alloy

The nano-eutectic in the microstructure of semisolid Mg–6Zn–1Y alloy
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半固态Mg-6Zn-1Y合金显微组织中的纳米共晶

DOI:
10.1016/j.matlet.2015.12.070
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发表时间:
2016-03
期刊:
影响因子:
3
通讯作者:
Yingbo Zhang
Yingbo Zhang
中科院分区:
材料科学3区
文献类型:
--
作者:
D;an Yao;Yingbo Zhang

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摘要研究了Mg-6 Zn-1 Y(at%)合金在540° C半固态下分别在20° C水和20° C空气中冷却后的显微组织。在水冷试样中发现了(α-Mg+ I相)纳米共晶。在TEM下研究了纳米共晶的细节。与慢冷凝固的面心二十面体I相相比,快冷凝固的二十面体I相是原始的。研究了纳米共晶中{01 1 <$1 $>} Mg <${τ 10} I−相和{10 1 <$0} Mg <$2 f I−相的取向关系。不同晶格结构的两相以半共格的方式匹配,表明界面处于低能状态。
Abstract The microstructures of Mg–6Zn–1Y (at%) alloys cooling in the 20° C water and 20° C air respectively from semisolid state at 540° C were investigated in this work. An (α-Mg+ I-phase) nano-eutectic was discovered in the water-cooled samples. The details of the nano-eutectic were investigated under TEM. Compared with the face-centered icosahedral I-phase solidified at slow cooling rate, the icosahedral type of I-phase solidified at fast cooling rate is primitive. The orientation relationship of the two phase in the nano-eutectic was also studied, namely {01 1 ̅ 1 ̅} Mg∥{τ 10} I− phase and {10 1 ̅ 0} Mg∥ 2 f I− phase. The two phases with different lattice structure matched as semi-coherent, which indicated that the interface was in a low energy state.
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