Experimentally quantifying critical stresses associated with basal slip and twinning in magnesium using micropillars

被引：96
作者：
Liu, Y. [1 ]
Li, N. [2 ]
Kumar, M. Arul [1 ]
Pathak, S. [2 ,3 ]
Wang, J. [4 ]
McCabe, R. J. [1 ]
Mara, N. A. [2 ,5 ]
Tome, C. N. [1 ]
机构：
[1] Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87545 USA
[2] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA
[3] Univ Nevada, Chem & Mat Engn, Reno, NV 89512 USA
[4] Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68583 USA
[5] Los Alamos Natl Lab, Inst Mat Sci, Los Alamos, NM 87545 USA
来源：
ACTA MATERIALIA | 2017年 / 135卷
基金：
美国国家科学基金会;
关键词：
Magnesium; Micropillar compression; Basal slip; Twin; CLOSE-PACKED METALS; SINGLE-CRYSTAL; HCP METALS; DEFORMATION MECHANISMS; STRAIN GRADIENTS; SHAPE-MEMORY; SCALE; COMPRESSION; PLASTICITY; NUCLEATION;
D O I：
10.1016/j.actamat.2017.06.008
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Basal slip and (01 (1) over bar2) twinning are two major plastic deformation mechanisms in hexagonal closed packed magnesium. Here we quantify the critical stresses associated with basal slip and twinning in single-crystal and bi-crystal magnesium samples by performing in situ compression of micropillars with different diameters in a scanning electron microscope. The micropillars are designed to favor either slip or twinning under uniaxial compression. Compression tests imply a negligible size effect related to basal slip and twinning as pillar diameter is greater than 10 mu m. The critical resolved shear stresses are deduced to be 29 MPa for twinning and 6 MPa for basal slip from a series of micropillar compression tests. Employing full-field elasto-visco-plastic simulations, we further interpret the experimental observations in terms of the local stress distribution associated with multiple twinning, twin nucleation, and twin growth. Our simulation results suggest that the twinning features being studied should not be close to the top surface of the micropillar because of local stress perturbations induced by the hard indenter. Published by Elsevier Ltd on behalf of Acta Materialia Inc.
引用
收藏
页码：411 / 421
页数：11
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