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International Journal for Multiscale Computational Engineering
Fator do impacto: 1.016 FI de cinco anos: 1.194 SJR: 0.554 SNIP: 0.68 CiteScore™: 1.18

ISSN Imprimir: 1543-1649
ISSN On-line: 1940-4352

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.v4.i1.120
pages 183-196

Nonuniformity Effect of Surface-Nanocrystalline Materials in Nanoindentation Test

Yueguang Wei
LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China
Xiaoliang Chen
LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China
Siqi Shu
LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China
Chen Zhu
LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China

RESUMO

In the present research, microstructures of the surface-nanocrystalline Al alloy material are observed and measured based on the transmission electron microscopy (TEM) technique, and the corresponding mechanical behaviors are investigated experimentally and theoretically. In the experimental research, the nanoindentation test method is used, and the load and microhardness curves are measured, which strongly depend on the grain size and grain size nonuniformity. Two kinds of the nanoindentation test methods are adopted: the randomly selected loading point method and the continuous stiffness method. In the theoretical modeling, based on the microstructure characteristics of the surface-nanocrystalline Al alloy material, a dislocation pile-up model considering the grain size effect and based on the Mott theory is presented and used. The hardness-indent depth curves are predicted and modeled.