Solute strengthening of prismatic slip, basal slip and {1 0 (1)over-bar 2} twinning in Mg and Mg-Zn binary alloys
Solute strengthening of prismatic slip, basal slip and {1 0 (1)over-bar 2} twinning in Mg and Mg-Zn binary alloys
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DOI：
10.1016/j.ijplas.2013.01.012
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发表时间：
2013-08-01
影响因子：
9.8
通讯作者：
Barnett, M. R.
中科院分区：
文献类型：
--
作者：
Stanford, N.;Barnett, M. R.
制备了Zn浓度在0 ~ 2.8 wt%之间的Mg-Zn二元合金，并通过热轧和退火制备了具有强基底织构和晶粒尺寸范围的试样。它们在三种不同的应变路径下变形：拉伸、压缩和剪切，以促进棱柱滑移、{10(1)优于杆体2}孪晶和基底滑移的优势。该实验数据已用于创建每种变形模式的Hall-Petch图。研究发现，柱状滑移系统在30 μ m以上的霍尔-皮切图中有一个平台，并且发现柱状滑移系统的溶质软化只在50 μ m以上的晶粒尺寸上起作用。在压缩中，激活孪晶所需的应力对Zn浓度不敏感。本文认为，在粗晶材料中，横滑应力占主导地位的条件下，可以理解棱柱滑移的溶质软化和异常霍尔-佩奇行为。还讨论了晶粒尺寸对基滑移、棱柱滑移和{10(1)/杆2}孪晶相对强度的影响。(c) 2013 Elsevier Ltd.版权所有。
Mg-Zn binary alloys with concentrations between 0 and 2.8 wt% Zn have been prepared and processed via hot rolling and annealing to produce specimens with a strong basal texture and a range of grain sizes. These have been deformed in three different strain paths: tension, compression and shear, in order to promote the dominance of prismatic slip, {1 0 (1) over bar 2} twinning and basal slip, respectively. This experimental data has been used to create Hall-Petch plots for each deformation mode. It has been found that the prismatic slip system has a plateau in its Hall-Petch plot above grain sizes of 30 mu m, and solute softening of the prismatic system was found to be operative only at grain sizes above similar to 50 mu m. In compression, the stress required to activate twinning was found to be insensitive to Zn concentration. It is proposed that solute softening and anomalous Hall-Petch behaviour of prismatic slip be understood in terms of the dominance of the cross-slip stress in coarse grained materials. The effect of grain size on the relative strength of basal slip, prismatic slip and {1 0 (1) over bar 2} twinning is also discussed. (c) 2013 Elsevier Ltd. All rights reserved.