Variant selection during secondary twinning in Mg-3%Al
Variant selection during secondary twinning in Mg-3%Al
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DOI：
10.1016/j.actamat.2010.03.027
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发表时间：
2010-06-01
期刊：
影响因子：
9.4
通讯作者：
Jonas, J. J.
中科院分区：
文献类型：
--
作者：
Martin, E.;Capolungo, L.;Jonas, J. J.
用电子背散射衍射技术研究了Mg-3.4%Al-0.33%Mn合金拉伸变形过程中二次孪晶的形成。这被用来识别在每一粒中形成的特定变体。为此目的，变种的特点是相对于母晶粒的方向，而不是其主机初级孪晶。这一办法导致将36个可能的变式重新组合成四组，即S-A、S-B、S-C和S-D，其中包括几何上相等的变式。统计分析表明，所观察到的次级双胞胎几乎全部为S-A和S-D型（取向差分别为37.5度和69.9度）。前一个变种被证明需要最少的住宿在母体粮食应变，并具有最大的增长潜力。相反，S-D变体的形成可以归因于其受到最高分辨剪切应力的青睐，即，它服从施密德定律。(C)2010 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Secondary twin formation during the tensile deformation of Mg-3.4%Al-0.33%Mn was studied by means of the electron backscatter diffraction technique. This was employed to identify the particular variants that formed in each grain. For this purpose, the variants were characterized with respect to the orientation of the parent grain rather than that of its host primary twin. This approach led to a regrouping of the 36 possible variants into four sets, namely S-A, S-B, S-C and S-D, consisting of variants that are geometrically equivalent. A statistical analysis revealed that the observed secondary twins were almost entirely of S-A and S-D type (misorientations of 37.5 degrees and 69.9 degrees, respectively). The former variant is shown to require the least accommodation strain within the parent grain and to have the greatest potential for growth. Formation of the S-D variant, in contrast, can be attributed to its being favored by the highest resolved shear stresses, i.e., it obeys Schmid's law. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.