In-situ X-ray radiography of twinned crystal growth of primary Al13Fe4
In-situ X-ray radiography of twinned crystal growth of primary Al13Fe4
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DOI：
10.1016/j.scriptamat.2020.04.010
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发表时间：
2020-07-15
影响因子：
6
通讯作者：
Grant, P. S.
中科院分区：
文献类型：
--
作者：
Feng, S.;Cui, Y.;Grant, P. S.
利用X射线原位照相技术研究了凝固Al-3Fe合金中初生Al-13 Fe-4金属间化合物的小面生长。显微孪晶中经常观察到的生长金属间化合物，并证实了凝固后的电子背散射衍射。提出了一种孪晶面内凹生长机制，重复形成内凹角有利于晶体沿沿着方向生长，形成细长板。相比之下，对于金属间化合物，这种优先生长受到周围晶体的约束，促进垂直于优先方向的层状孪晶的形成，并导致较低的纵横比，已知对拉伸性能的危害较小。(C)2020 Acta Materialia Inc.爱思唯尔有限公司出版
The faceted growth of primary Al13Fe4 intermetallic compounds was studied using in-situ X-ray radiography in a solidifying Al-3Fe alloy. Microscopic twins were frequently observed in the growing intermetallics and were confirmed by post-solidification electron backscatter diffraction. A twin plane reentrant growth mechanism was suggested, where repeated formation of re-entrant corners facilitated crystal growth along a preferential direction, forming elongated plates. In contrast, for intermetallics where this preferential growth was constrained by surrounding crystals, formation of layered twins perpendicular to the preferential direction was promoted and led to lower aspect ratios, known to be less deleterious to tensile properties. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd.