Grain-boundary strengthening in nanocrystalline chromium and the Hall-Petch coefficient of body-centered cubic metals

被引：214

作者：

Wu, D. ^{[1
]}

Zhang, Junyan ^{[2
]}

Huang, J. C. ^{[3
]}

Bei, H. ^{[4
]}

Nieh, T. G. ^{[1
]}

机构：

[1] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[2] Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China

[3] Natl Sun Yat Sen Univ, Dept Mat & Optoelect Sci, Kaohsiung 804, Taiwan

[4] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

来源：

SCRIPTA MATERIALIA | 2013年 / 68卷 / 02期

基金：

美国国家科学基金会;

关键词：

Grain boundaries; Nanocrystalline metal; Nanoindentation; Hall-Petch effect; STRAIN-RATE SENSITIVITY; MECHANICAL-PROPERTIES; SINGLE-CRYSTALS; FLOW-STRESS; TEMPERATURE-DEPENDENCE; PLASTIC-DEFORMATION; THIN-FILMS; SIZE; BEHAVIOR; IRON;

D O I：

10.1016/j.scriptamat.2012.09.025

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Nanocrystalline Cr (nc-Cr) was synthesized by electrodeposition. Samples with various grain sizes (19-57 nm) were prepared by annealing the as-deposited sample. Microstructures were examined using X-ray and electron microscopy, and the mechanical properties were evaluated using nanoindentation. The strength of nc-Cr samples apparently obeyed the classical Hall-Petch relationship. It was found that hardening potency caused by grain refinement was generally higher in body-centered cubic metals than that in face-centered cubic and hexagonal close-packed metals. A possible explanation was offered. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：118 / 121

页数：4

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