Effect of Zn on the microstructure evolution of extruded Mg-3Nd (-Zn)-Zr (wt.%) alloys
Effect of Zn on the microstructure evolution of extruded Mg-3Nd (-Zn)-Zr (wt.%) alloys
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DOI：
10.1016/j.msea.2012.02.030
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发表时间：
2012-05-01
期刊：
影响因子：
6.4
通讯作者：
Ding, Wenjiang
中科院分区：
文献类型：
--
作者：
Ma, Lan;Mishra, Raja K.;Ding, Wenjiang
本文介绍了挤压Mg-Nd-Zn合金的显微组织的透射电子显微镜研究的结果，表现出改善的强度，使其成为潜在的候选人的保险杠梁的应用。制备三组具有0%、0.2%和0.5%Zn添加的挤压棒，以检查Zn对挤压态和时效条件下的析出物的影响。至少有五种不同的沉淀相具有不同的结构，形态和分布被确定和相关的机械性能。锌被认为是没有影响富钕相的沉淀顺序，但似乎控制这些阶段的增长。结果表明，微量Zn的加入，由于合金中Zn与Nd之间的亲和力较强，导致析出相性质发生剧烈变化，形成Mg-Nd-Zn金属间化合物，影响合金的强度和塑性。控制Nd和Zn含量对于利用Nd诱导的“稀土织构”来改善延展性和当存在Zn时通过Mg-Nd-Zn金属间化合物的沉淀强化是必要的。(C)2012爱思唯尔有限公司版权所有。
This paper presents the results of a transmission electron microscopy study of the microstructure of extruded Mg-Nd-Zn alloys that exhibit improvement in strength, making them potential candidates for bumper beam applications. Three sets of extruded rods with 0%, 0.2% and 0.5% Zn addition are prepared to examine the effect of Zn on the precipitates in the as-extruded and aged condition. At least five different precipitate phases with different structures, morphologies and distributions were identified and correlated with the mechanical properties. Zn is seen to have no effect on the precipitation sequence of Nd-rich phases but seems to control the growth of those phases. It is found that small amount of Zn can lead to drastic changes in the nature of the precipitate phase due to the strong affinity between Zn and Nd in the alloy to form Mg-Nd-Zn intermetallics, affecting the strength and ductility. Control of both the Nd and Zn content are necessary to take advantage of the "rare earth texture" induced by Nd to improve ductility and precipitation strengthening by the Mg-Nd-Zn intermetallics when Zn is present. (C) 2012 Elsevier B.V. All rights reserved.