Triggering rare earth texture modification in magnesium alloys by addition of zinc and zirconium
Triggering rare earth texture modification in magnesium alloys by addition of zinc and zirconium
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DOI：
10.1016/j.actamat.2013.12.015
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发表时间：
2014-04-01
期刊：
影响因子：
9.4
通讯作者：
Al-Samman, T.
中科院分区：
文献类型：
--
作者：
Basu, I.;Al-Samman, T.
两种镁合金，Mg-1Zn-1Ce-0.6Zr和Mg-1Zn-1Gd-0.6Zr（wt. %），进行大应变热轧处理，然后在不同温度下退火。在剪切带内部和颗粒附近开始再结晶的形核，导致具有不同储能的取向的全景。再结晶导致新的、更软的取向（就滑动而言）的演变，并伴随着显着的纹理弱化。在与它们各自的二元对应物的比较中，四元化合物确立了由非稀土（非RE）元素（Zn，Zr）的额外存在在增强RE织构改性效果中所发挥的显著作用。与Mg-lCe相反，Mg-1Zn-0. 6Zr-lCe中的形变/再结晶织构改性由沉淀物再溶解和偏析事件之间的复杂相互作用控制。与Mg-1Gd合金相比，Mg-1Zn-0.6Zr-1Gd合金在较低的退火温度下发生形变/再结晶织构转变。这种行为是由于在后者的RE非RE溶质配对/集群的趋势增加，从而放大溶质阻力和放大选择性生长事件。退火后进行的拉伸试验表明，显着的延展性改善，在四元合金超过其二元等价物。(C)2013 Acta Materialia Inc.由Elsevier Ltd.出版。保留所有权利。
Two Mg alloys, Mg-1Zn lCe-0.6Zr and Mg-1Zn-1Gd-0.6Zr (wt.%), were subjected to large strain hot rolling treatment, followed by annealing at different temperatures. Nucleation of recrystallization initiated inside shear bands and in the vicinity of particles, resulting in a panorama of orientations with varying stored energies. Recrystallization resulted in the evolution of new, softer orientations, in terms of slip, accompanied by significant texture weakening. On comparison with their respective binary counterparts, the quaternaries established the significant role played by the additional presence of non-rare earth (non-RE) elements (Zn, Zr) in augmenting the RE texture modification effect. Contrary to Mg-lCe, deformation/recrystallization texture modification in Mg-1Zn-0.6Zr-lCe was governed by a complex interplay between precipitate redissolution and segregation events. Moreover, compared to Mg-1Gd, the Mg-1Zn-0.6Zr-1Gd alloy revealed deformation/recrystallization texture transition at lower annealing temperature. Such a behavior was attributed to an increased tendency of RE non-RE solute-pairing/clustering in the latter, thereby amplifying solute drag and magnifying selective growth events. Tensile tests conducted post-annealing revealed remarkable ductility improvement in the quaternary alloys over their binary equivalents. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.