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

  • Symposium: Micromechanics of Advanced Materials III in Honor of J.C.M. Li
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Abstract

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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Acknowledgments

All authors gratefully acknowledge the support from the Danish National Research Foundation (Grant No. DNRF86-5) and the NSFC of China (Grant No. 51261130091) to the Danish-Chinese Center for Nanometals. Valuable assistance in data analysis from Andy Godfrey, Xuehao Zhen, and Jun Sun is highly appreciated.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, P.R. China

    Chaoling Xu (Joint PhD Student), Guilin Wu (Researcher) & Qing Liu (Professor)

  2. Section for Materials Science and Advanced Characterization, Department of Wind Energy, Technical University of Denmark, Risø Campus, 4000, Roskilde, Denmark

    Chaoling Xu (Joint PhD Student), Yubin Zhang (Senior Scientist), Fengxiang Lin (Postdoctoral Fellow) & Dorte Juul Jensen (Professor)

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  1. Chaoling Xu
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  2. Yubin Zhang
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  3. Fengxiang Lin
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  4. Guilin Wu
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  5. Qing Liu
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  6. Dorte Juul Jensen
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Correspondence to Chaoling Xu.

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Manuscript submitted November 2, 2015.

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Xu, C., Zhang, Y., Lin, F. et al. Crystallographic Analysis of Nucleation at Hardness Indentations in High-Purity Aluminum. Metall Mater Trans A 47, 5863–5870 (2016). https://doi.org/10.1007/s11661-016-3704-3

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