Characterisation of three-dimensional dendritic morphology and orientation selection of α-Mg in Mg-Ca alloy using synchrotron X-ray tomography

被引：23

作者：

Shuai, Sansan ^{[1
]}

Guo, Enyu ^{[1
,2
]}

Zheng, Qiwei ^{[1
]}

Wang, Mingyue ^{[3
]}

Jing, Tao ^{[1
]}

机构：

[1] Tsinghua Univ, Key Lab Adv Mat Proc Technol, Sch Mat Sci & Engn, Minist Educ, Beijing 100084, Peoples R China

[2] Arizona State Univ, Sch Engn Matter Transport & Energy, Mat Sci & Engn, Tempe, AZ 85287 USA

[3] Beihang Univ, Int Res Inst Multidisciplinary Sci, Beijing 100191, Peoples R China

来源：

MATERIALS CHARACTERIZATION | 2016年 / 111卷

基金：

美国国家科学基金会;

关键词：

Dendritic morphology; Growth orientation; X-ray tomography; Mg-Ca alloy; Branching structure; PHASE-FIELD SIMULATIONS; IN-SITU OBSERVATIONS; SHORT FATIGUE-CRACK; DIRECTIONAL SOLIDIFICATION; MECHANICAL-PROPERTIES; CORROSION PROPERTIES; GRAIN-REFINEMENT; MAGNESIUM; GROWTH; MICROSTRUCTURE;

D O I：

10.1016/j.matchar.2015.12.003

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The dendritic morphology and branching structure of alpha-Mg dendrites were investigated in both columnar and equiaxed growth Mg-9 wt.%Ca alloys. Using synchrotron X-ray tomography, dendrite morphologies were observed in Mg-Ca alloys from columnar and equiaxed growth, revealing 5, 4 and 3 side arms growing around the primary trunk. The crystallographic growth directions of the main trunk and branch arms were determined, through the topological analysis of the dendritic branching structure, as well as the computed angles between them. The results clearly showed that the preferential crystallographic orientations of primary a-Mg dendrites in Mg-Ca alloy are dominated by <11<(2)over bar>0> and <22<(4)over bar>5> orientations. (C) 2015 Elsevier Inc. All rights reserved.

引用

页码：170 / 176

页数：7

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