Abstract
The present study emphasizes the importance of the direct evaluation of the athermal strength of structural materials, which is the time-independent material strength that corresponds to the basic capability to bear stresses caused by external forces permanently, and we call it the “permanent strength.” The present experimental study, taking FCC metals processed by severe plastic deformation (SPD), shows that the permanent strength is unexpectedly much lower than the flow stress temporally observed in a standard tensile test. More than half of the observed flow stress corresponds to the time-dependent thermal strength. Furthermore, the grain refinement associated with SPD processing never contributes to the augmentation of the permanent strength, i.e., the Hall–Petch relation is not applicable to as-SPDed materials. In contrast to aluminum, for copper, the low permanent strength produced by SPD is never revived by subsequent annealing. These observations elicit the general view that we should know the permanent strength of structural materials, not limited to SPD-processed metals, because we must confirm that the permanent strength is higher than the allowable stress in structural design to ensure the use of the structure within its elastic range in normal environments.
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The authors are grateful for the support provided by JSPS KAKENHI Grant Number 19K04066.
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Koizumi, T., Ogoda, K. & Kuroda, M. Permanent Strength of Metals: A Case Study on FCC Metals Processed by Severe Plastic Deformation. Metall Mater Trans A 53, 2004–2017 (2022). https://doi.org/10.1007/s11661-022-06641-1
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DOI: https://doi.org/10.1007/s11661-022-06641-1