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

Journal Article · · Acta Materialia

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.

Research Organization:
Los Alamos National Laboratory (LANL)
Sponsoring Organization:
USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
Grant/Contract Number:
AC52-06NA25396; W-7405-ENG-36
OSTI ID:
1364544
Report Number(s):
LA-UR-16-27007
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Vol. 135; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Three-dimensional character of the deformation twin in magnesium journal July 2019
Microbending Experiments on Pure Magnesium with Nonbasal Slip Orientation journal August 2018
Processing of Dilute Mg–Zn–Mn–Ca Alloy/Nb Multilayers by Accumulative Roll Bonding journal August 2019
Three-dimensional character of the deformation twin in magnesium journal July 2019
Study of basal < a > and pyramidal < c + a > slips in Mg-Y alloys using micro-pillar compression journal February 2020

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