期刊
ACTA MATERIALIA
卷 135, 期 -, 页码 411-421出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2017.06.008
关键词
Magnesium; Micropillar compression; Basal slip; Twin
资金
- Office of Basic Energy Sciences under US DOE [FWP 06SCPE401, W-7405-ENG-36]
- US National Science Foundation (NSF-CMMI) [1661686]
- University of Nevada, Reno, under Contract FEIN [886000024]
- National Nuclear Security Administration of the U.S. Department of Energy [DE-AC52-06NA25396]
- National Science Foundation [ECCS: 1542182]
- Nebraska Research Initiative
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1661686] Funding Source: National Science Foundation
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.
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