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Study of slip activity in a Mg-Y alloy by in situ high energy X-ray diffraction microscopy and elastic viscoplastic self-consistent modeling

Journal Article · · Acta Materialia
 [1];  [2];  [2];  [2];  [3];  [4];  [5];  [3];  [6]
  1. Helmholtz-Zentrum Geesthact (Germany); Shanghai Jiao Tong Univ. (China)
  2. Shanghai Jiao Tong Univ. (China)
  3. Helmholtz-Zentrum Geesthacht (Germany)
  4. Argonne National Lab. (ANL), Lemont, IL (United States)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Shanghai Jiao Tong Univ. (China); Shanghai Innovation Inst. for Materials, Shanghai (China)
+ Show Author Affiliations

Slip activity from various slip modes largely determines the yield strength and ductility of Mg alloys. Solid solution elements in Mg can change the slip activity dramatically. In this paper, far-field high energy X-ray diffraction microscopy (FF-HEDM) is employed to study slip activity in a Mg-3wt%Y alloy during an in situ tensile experiment. The specimen was incrementally loaded up to 3% engineering strain along the rolling direction. At each load step, FF-HEDM data were collected to track the crystallographic orientation, center of mass, and stress tensor changes of nearly 1000 grains in the probed volume. By analyzing the change in orientation and stress tensor of individual grains at different load steps, it is possible to identify the activated slip systems and measure their critical resolved shear stress (CRSS) values. Prismatic slip and pyramidal I slip are found to be very active in this alloy. The estimated CRSS values for basal slip, prismatic slip and pyramidal I slip are 12 MPa, 38 MPa, and 36 MPa, respectively. These CRSS values were applied in a dislocation-based elastic viscoplastic self-consistent (EVPSC) model that successfully simulated the tensile stress-strain curve from the FF-HEDM experiment. The model also qualitatively predicted the crystal rotation in most of the selected grains, though it underestimated the internal stress and the magnitude of crystal rotation in these grains. Influence of solute Y on the strength and ductility of Mg alloys is discussed.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science; National Science Foundation of China; Alexander von Humboldt Foundation
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1465754
Alternate ID(s):
OSTI ID: 22744716
OSTI ID: 1582808
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 155; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Three-dimensional character of the deformation twin in magnesium journal July 2019
On the High Formability of AZ31-0.5Ca Magnesium Alloy journal November 2018
Study of basal < a > and pyramidal < c + a > slips in Mg-Y alloys using micro-pillar compression journal February 2020

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