Power law scaled hardness of Mn strengthened nanocrystalline Al-Mn non-equilibrium solid solutions

SCRIPTA MATERIALIA

卷:120

Article

Wang, William Yi^1,2  Darling, Kristopher A.³  Wang, Yi¹  Shang, Shun-Li¹  Kecskes, Laszlo J.³  Hui, Xi Dong⁴  Liu, Zi-Kui¹ 

[1] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

[2] Northwestern Polytech Univ, Sch Mat Sci & Engn, Xian 710072, Shanxi Province, Peoples R China

[3] US Army Res Lab, Weap & Mat Res Directorate, RDRL WMM F, Aberdeen Proving Ground, MD 21005 USA

[4] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

关键词: Bonding charge density;    Electron work function;    Solid-solution hardening;    Grain refinement strengthening;   

DOI  :  10.1016/j.scriptamat.2016.04.003

来源: Elsevier

【 摘 要 】

In this work, the effects of Mn on lattice parameter, electron work function (EWF), bonding charge density, and hardness of nanocrystalline Al-Mn non-equilibrium solid solutions are investigated. We show how the enhancement of the EWF contributes to the observed improvement of the hardness of Al-Mn solid solutions. It is understood that the physical mechanisms responsible in our model, using the EWF coupled with a power law scaled hardness, are attributed to the redistribution of electrons caused by the presence of Mn solute atoms, supporting an atomic and electronic basis for the coupling of solid solution and grain refinement strengthening mechanisms. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

Free