The effect of rare earth element segregation on grain boundary energy and mobility in magnesium and ensuing texture weakening
The effect of rare earth element segregation on grain boundary energy and mobility in magnesium and ensuing texture weakening
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DOI：
10.1016/j.scriptamat.2017.11.004
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发表时间：
2018-03-15
影响因子：
6
通讯作者：
El Kadiri, Haitham
中科院分区：
文献类型：
--
作者：
Barrett, Christopher D.;Imandoust, Aidin;El Kadiri, Haitham
本文阐明了与织构随机化有关的一个关键问题--稀土对晶界的影响.我们使用电子背散射衍射和分子动力学比较纯镁和含钇合金之间的再结晶。该合金的织构组分最初相似，但纯Mg中的大（a）纤维晶粒超过所有其他组分。Y偏聚使（a）纤维晶界的能量均匀化，减少了传统的再结晶。晶界迁移率降低成比例的能量稳定，减少挤压织构的优势< 1010 >。这允许其他晶粒取向稳定，从而产生更随机的织构。(C)2017 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
This paper elucidates a key puzzle related to texture randomization - effect of rare earth on grain boundaries. We use electron back-scatter diffraction and molecular dynamics to compare recrystallization between pure Mg and a Y-containing alloy. The alloy's texture components were initially similar, but the large (a) fiber grains in pure Mg overtook all other components. Y segregation homogenized the energies of (a) fiber grain boundaries, curtailing conventional recrystallization. Grain boundary mobilities were reduced proportionally to the energy stabilization, reducing the dominance of < 1010 > extrusion texture. This allows other grain orientations to stabilize thus producing a more randomize texture. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.