Critical Strengths for Slip Events in Nanocrystalline Metals: Predictions of Quantized Crystal Plasticity Simulations

被引:0
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作者
Lin Li
Myoung-Gyu Lee
Peter M. Anderson
机构
[1] The Ohio State University,Department of Materials Science and Engineering
[2] Pohang University of Science and Technology,Graduate Institute of Ferrous Technology
来源
Metallurgical and Materials Transactions A | 2011年 / 42卷
关键词
Residual Stress; Slip System; Critical Strength; Critical Resolve Shear Stress; Slip Event;
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摘要
This article studies how the monotonic and cyclic stress-strain response of nanocrystalline (NC) metals is affected by the grain-to-grain distribution of critical strengths (τc) for slip events, as well as plastic predeformation (εprep). This is accomplished via finite element simulations that capture large jumps in plastic strain from dislocation slip events—a process referred to as quantized crystal plasticity (QCP).[1] The QCP simulations show that τc and εprep significantly alter the monotonic and cyclic response at small strain, but only τc affects the response at large strain. These features are exploited to systematically infer the τc and εprep characteristics that best fit experimental data for electrodeposited (ED) NC Ni. Key outcomes are the following: (1) the τc distribution is truncated, with an abrupt onset of slip events at a critical stress; (2) εprep = −0.4 pct, signifying precompression; (3) there is reverse slip bias, meaning that reverse slip events are easier than forward events; and (4) highly inhomogeneous residual stress states can be enhanced or reduced by tensile deformation, depending on εprep.
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页码:3875 / 3882
页数:7
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