skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Experimentally quantifying critical stresses associated with basal slip and twinning in magnesium using micro-pillars

Abstract

Basal slip and {01$$\bar{1}$$2} twinning are two major plastic deformation mechanisms in hexagonal closed-packed magnesium. Here in this paper, 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 μm. 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.

Authors:
 [1]; ORCiD logo [1];  [1];  [1];  [2]; ORCiD logo [1]; ORCiD logo [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of Nebraska, Lincoln, NE (United States). Dept. of Mechanical and Materials Engineering
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
OSTI Identifier:
1364544
Report Number(s):
LA-UR-16-27007
Journal ID: ISSN 1359-6454
Grant/Contract Number:  
AC52-06NA25396; W-7405-ENG-36
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 135; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Magnesium; Micropillar compression; Basal slip; Twin

Citation Formats

Liu, Yue, Li, Nan, Mariyappan, Arul Kumar, Pathak, Siddhartha, Wang, Jian, Mccabe, Rodney James, Mara, Nathan Allan, and Tome, Carlos N. Experimentally quantifying critical stresses associated with basal slip and twinning in magnesium using micro-pillars. United States: N. p., 2017. Web. doi:10.1016/j.actamat.2017.06.008.
Liu, Yue, Li, Nan, Mariyappan, Arul Kumar, Pathak, Siddhartha, Wang, Jian, Mccabe, Rodney James, Mara, Nathan Allan, & Tome, Carlos N. Experimentally quantifying critical stresses associated with basal slip and twinning in magnesium using micro-pillars. United States. doi:10.1016/j.actamat.2017.06.008.
Liu, Yue, Li, Nan, Mariyappan, Arul Kumar, Pathak, Siddhartha, Wang, Jian, Mccabe, Rodney James, Mara, Nathan Allan, and Tome, Carlos N. Wed . "Experimentally quantifying critical stresses associated with basal slip and twinning in magnesium using micro-pillars". United States. doi:10.1016/j.actamat.2017.06.008. https://www.osti.gov/servlets/purl/1364544.
@article{osti_1364544,
title = {Experimentally quantifying critical stresses associated with basal slip and twinning in magnesium using micro-pillars},
author = {Liu, Yue and Li, Nan and Mariyappan, Arul Kumar and Pathak, Siddhartha and Wang, Jian and Mccabe, Rodney James and Mara, Nathan Allan and Tome, Carlos N.},
abstractNote = {Basal slip and {01$\bar{1}$2} twinning are two major plastic deformation mechanisms in hexagonal closed-packed magnesium. Here in this paper, 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 μm. 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.},
doi = {10.1016/j.actamat.2017.06.008},
journal = {Acta Materialia},
number = ,
volume = 135,
place = {United States},
year = {Wed Jun 07 00:00:00 EDT 2017},
month = {Wed Jun 07 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

Save / Share: