New perspectives on the grain-size dependent yield strength of polycrystalline metals

SCRIPTA MATERIALIA

卷:166

Article

Di Leo, Claudio V.¹  Rimoli, Julian J.¹ 

[1] Georgia Inst Technol, Sch Aerosp Engn, Atlanta, GA 30332 USA

关键词: Hall-fetch effect;    Plasticity;    Metal and alloys;    Microstructure;   

DOI  :  10.1016/j.scriptamat.2019.03.019

来源: Elsevier

【 摘 要 】

We formulate the grain-size dependent strengthening of polycrystalline metals as a multiplicative decomposition of the coarse-grain strength a o and a function depending on the grain size d normalized by a characteristic coarse-grain length scale L = b(G/sigma(0)), where G is the shear modulus, and b the magnitude of the Burgers vector. We show that this formulation leads to a collapse of all experimental data analyzed, making experimental results across different materials comparable. This suggests that the grain-size dependent strengthening of several materials can be characterized by a single function with different materials distinguished only by their coarse-grain strength. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free