Transition in the deformation mode of nanocrystalline tantalum processed by high-pressure torsion

被引：20
作者：
Ligda, J. P. [1 ]
Schuster, B. E. [2 ]
Wei, Q. [3 ]
机构：
[1] Univ N Carolina, PhD Program Nanoscale Sci & Technol, Charlotte, NC 28223 USA
[2] USA, Res Lab, Aberdeen Proving Ground, MD 21005 USA
[3] Univ N Carolina, Dept Mech Engn, Charlotte, NC 28223 USA
来源：
SCRIPTA MATERIALIA | 2012年 / 67卷 / 03期
关键词：
Nanoindentation; Nanocrystalline metal; Shear bands; Microcompression; Severe plastic deformation; ULTRAFINE GRAIN SIZES; MECHANICAL-PROPERTIES; ELASTIC-MODULUS; SHEAR BANDS; BEHAVIOR; MICROSTRUCTURE; INDENTATION; COMPRESSION; IRON; METHODOLOGY;
D O I：
10.1016/j.scriptamat.2012.04.031
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We present quasi-static room temperature compression and nanoindentation data for nanocrystalline and ultrafine grained tantalum processed by high-pressure torsion. Because bulk samples possess an inherent gradient in properties, microstructures were characterized using site-specific transmission electron microscopy and synchrotron X-ray diffraction. Nanocrystalline Ta shows appreciable homogeneous plastic deformation in compression; however, specimens with the smallest grain sizes exhibit localized plastic deformation via shear bands. Microstructural changes associated with this transition in deformation mode are discussed. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：253 / 256
页数：4
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