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Effects of free surface and heterogeneous residual internal stress on stress-driven grain growth in nanocrystalline metals

  • By reevaluating the experimental study of Zhang et al. (2005), here we demonstrate that the extent of grain growth, previously proposed to be solely driven by external stress, may have been significantly overestimated. A new physical mechanism, termed as free surface assisted stress-driven grain growth (or self-mechanical annealing), is proposed and discussed in detail. Representing the cooperative effect of free surface and heterogeneous residual internal stress, the proposed mechanism is consideredmore favorable than the traditional pure stress-driven mechanism for interpreting the abnormal grain growth widely observed in deforming nanocrystalline metals at room temperature.

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Document Type:Article
Author:F. Wang, J. Zhao, P. Huang, Andreas S. Schneider, T. J. Lu, K. W. Xu
Parent Title (English):Journal of Nanomaterials
First Page:934986
Year of first Publication:2013
Release Date:2022/11/18
Impact:01.611 (2013)
Funding Information:National Basic Research Program of China (2010CB631002, 2011CB610306,), the National Natural Science Foundation of China (51171141, 50701034), Program for New Century Excellent Talents in University (NCET-11-0431), Research Fund for the Doctoral Program of Higher Education of China (20120201110001), and the Fundamental Research Funds for the Central Universities.
Open Access:Open Access
Signature:INM 2013/106
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International