Crystallographic Analysis of Nucleation at Hardness Indentations in High-Purity Aluminum

被引:0
|
作者
Chaoling Xu
Yubin Zhang
Fengxiang Lin
Guilin Wu
Qing Liu
Dorte Juul Jensen
机构
[1] Chongqing University,College of Materials Science and Engineering
[2] Technical University of Denmark,Section for Materials Science and Advanced Characterization, Department of Wind Energy
来源
Metallurgical and Materials Transactions A | 2016年 / 47卷
关键词
Orientation Relationship; Crystallographic Orientation; Grain Orientation; Misorientation Angle; Nucleation Mechanism;
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中图分类号
学科分类号
摘要
Nucleation at Vickers hardness indentations has been studied in high-purity aluminum cold-rolled 12 pct. Electron channeling contrast was used to measure the size of the indentations and to detect nuclei, while electron backscattering diffraction was used to determine crystallographic orientations. It is found that indentations are preferential nucleation sites. The crystallographic orientations of the deformed grains affect the hardness and the nucleation potentials at the indentations. Higher hardness gives increased nucleation probabilities. Orientation relationships between nuclei developed at different indentations within one original grain are analyzed and it is found that the orientation distribution of the nuclei is far from random. It is suggested that it relates to the orientations present near the indentation tips which in turn depend on the orientation of the selected grain in which they form. Finally, possible nucleation mechanisms are briefly discussed.
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页码:5863 / 5870
页数:7
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