On the crystallographic features of Mn precipitates in a Mg–Sn–Mn alloy

On the crystallographic features of Mn precipitates in a Mg–Sn–Mn alloy
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Mg-Sn-Mn合金中Mn析出相的晶体学特征

DOI:
10.1016/j.jallcom.2015.02.026
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发表时间:
2015-06
影响因子:
6.2
通讯作者:
Weigang Huang
Weigang Huang
中科院分区:
材料科学2区
文献类型:
--
作者:
Xuefei Huang;Hongjia Li;Wupeng Cai;Weigang Huang

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用透射电子显微镜研究了一种镁锡锰合金中锰析出物的结晶学特征。所有的锰析出物都被鉴定为α-Mn。析出物具有两种不同的形态,其特征是与镁基体的取向关系(OR)不同。一种是生长方向为<1 1 1>Mn//[0 0 0 1]mg的α-Mn棒材,其OR表示为<1 1 0>Mn//<1 0 1‘0>mg,{1 1 1}mN//(0 0 1)mg,这与二元镁锰合金中报道的结果一致。另一种是块状α-Mn,其习性平面为{1‘1 0}mN//(0 0 0 1)mg,对应的OR是新的,描述为<1 1 3>mN//<1 0 1’0>mg,{1‘1 0}mN//(0 0 1)mg。在[0 0 0 1]镁棒与镁基质之间观察到原子平坦且几乎完全共格的晶格面,这解释了它们的较好的形貌。并从界面晶格失配的角度讨论了不同OR值的α-Mn析出物的择优取向。
The crystallographic features of the Mn precipitates in a Mg–Sn–Mn alloy have been investigated using transmission electron microscopy (TEM). All the Mn precipitates are identified as α-Mn. The precipitates have two different morphologies characterized by their different orientation relationships (OR) with the Mg matrix. One is the α-Mn rod with a growth direction of< 1 1 1> Mn//[0 0 0 1] Mg, and the OR for this type of α-Mn is expressed as< 1 1 0> Mn//< 1 0 1¯ 0> Mg,{1 1 1} Mn//(0 0 0 1) Mg, which is consistent with that reported in binary Mg–Mn alloys. The other is the blocky α-Mn with a habit plane of {1¯ 1 0} Mn//(0 0 0 1) Mg, and the corresponding OR is novel, which is described as< 1 1 3> Mn//< 1 0 1¯ 0> Mg,{1¯ 1 0} Mn//(0 0 0 1) Mg. An atomically flat and nearly fully coherent lattice planes between the [0 0 0 1] Mg rods and Mg matrix was observed, which account for their preferred morphology. The preferences of the α-Mn precipitates with different ORs have also been discussed in terms of the lattice misfit in interfaces.
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