Micropillar compression deformation of single crystals of the intermetallic compound ζ-FeZn13
Micropillar compression deformation of single crystals of the intermetallic compound ζ-FeZn13
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DOI：
10.1016/j.actamat.2013.10.065
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发表时间：
2014-02-15
期刊：
影响因子：
9.4
通讯作者：
Inui, Haruyuki
中科院分区：
文献类型：
--
作者：
Okamoto, Norihiko L.;Inomoto, Masahiro;Inui, Haruyuki
用聚焦离子束法制备了13种不同晶向的单晶，在室温下用微柱压缩实验研究了Fe-Zn系Zeta相的变形行为。观测到了两个不同的滑移系统，{110}和(100)[001]。对于(100)[001]滑移，{110}<；1(1)滑移的临界分辨剪应力(CRSS)值比(100)[001]滑移的临界分辨剪应力(CRSS)值小三倍以上。根据这两个滑移系CRSS中的各向异性，预测了大多数晶体取向的{110}和lt；1(1)滑移，除了(100)[001]滑移在[(3)BAR 05]附近的一个狭窄取向区。在Bar2)滑移上，{110}和lt；1(1)的CRSS表现出与样品大小成反比的幂函数标度，指数为-0.517。考虑到CRSS的试件尺寸效应，{110}和lt；1(1)在Bar2)滑移上的整体CRSS值估计为62-76 Mpa。从晶体结构中原子键的性质，特别是铁心锌二十面体中的刚性原子键(滑移面的选择)，以及沿滑移方向的势垒高度和由此产生的可能的解离方案(滑移方向的选择)，讨论了选择具有较长Burgers矢(0.7700 nm)的滑移的最容易的滑移系的原因。根据所获得的结果，对如何改善镀锌钢织构涂层中Zeta相的变形能力提出了一些建议。(C)2013 Acta Materialia Inc.由Elsevier Ltd.出版。保留所有权利。
The deformation behavior of the zeta phase in the Fe-Zn system has been investigated by micropillar compression tests at room temperature with the use of single crystals with 13 different crystal orientations prepared by the focused ion beam method. Two different slip systems, {110}< 1 (1) over bar2) and (100)[001], are observed to operate. The critical resolved shear stresses (CRSS) value for {110}< 1 (1) over bar2) slip is more than three times smaller than that for (100)[001] slip. From the anisotropy in CRSS for these two slip systems, {110} < 1 (1) over bar2) slip is predicted to operate for most crystal orientations, except for a narrow orientation region around [(3) over bar 05] where (100)[001] slip operates. The CRSS for {110}< 1 (1) over bar2) slip shows an inverse power-law scaling against the specimen size with an exponent of -0.517. The bulk CRSS value for {110}< 1 (1) over bar2) slip is estimated to be 62-76 MPa by taking into account the specimen size effects of CRSS. The reasons why {110}< 1 (1) over bar2) slip with a rather long Burgers vector (0.7700 nm) is selected as the easiest slip system are discussed in terms of the nature of atomic bonding in the crystal structure, especially the rigid atomic bonding within an Fe-centered Zn-12 icosahedron (for slip plane selection), and the energetic barrier height along the slip direction and the resultant possible dissociation schemes (for slip direction selection). Some implications are made on how the deformability of the zeta phase can be improved in the textured coating layer in galvannealed steels based on the results obtained. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.