Grain boundary co-segregation in magnesium alloys with multiple substitutional elements
Grain boundary co-segregation in magnesium alloys with multiple substitutional elements
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DOI：
10.1016/j.actamat.2021.116749
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发表时间：
2021-02-26
期刊：
影响因子：
9.4
通讯作者：
Al-Samman, Talal
中科院分区：
文献类型：
--
作者：
Pei, Risheng;Zou, Yongchun;Al-Samman, Talal
在镁中添加合金元素可以根据其固溶度和析出行为改变再结晶过程中常见的基底织构。随着各种站得住脚的理论在文献中，一个更大的理解是需要如何限制增长，由于拖曳效应和退火织构形成的联系。本文研究了一种Mg-3Al-1 Zn-0.3Ca（wt.%）复合镁合金。具有多个替代元素的合金经受变形和退火处理的组合，以检查本体溶质浓度的变化如何影响其偏析和沉淀行为。这项工作特别侧重于溶质偏析到晶界，并表明偏析的类型和水平在控制生长行为中起着关键作用，这种方式限制了具有基底织构的晶粒的优先生长。在这一领域更深入的知识，可以预期推进当前的合金设计策略，通过调整固溶体中的溶质浓度，通过有针对性的热处理，以导致所需的量的第二相沉淀和晶界偏析。(C)2021 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Alloying additions in magnesium can modify common basal textures during recrystallization based on their solid solubility and precipitation behavior. With a variety of tenable theories in the literature, a far greater understanding is required of how restricted growth due to drag effects and annealing texture formation are linked. In the current work, a complex magnesium alloy Mg-3Al-1Zn-0.3Ca (wt.%) with multiple substitutional elements was subjected to a combination of deformation and annealing treatments in order to examine how a variation of bulk solute concentrations would influence its segregation and precipitation behavior. The work focuses in particular on solute segregation to grain boundaries and demonstrates that the type and level of segregation play a key role in controlling the growth behavior in such a way that restricts preferential growth of grains with a basal texture. Deeper knowledge in this area can be expected to advance current alloy design strategies by tweaking the solute concentration in the solid solution through targeted heat treatments to result in the required amounts of second phase precipitation and grain boundary segregation. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.