Journal
ACTA MATERIALIA
Volume 159, Issue -, Pages 31-45Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2018.08.013
Keywords
Mg-Gd-Y alloy; Strain rate; Room-temperature ductility; Slip traces analysis
Funding
- National Key Research and Development Program of China [2016YFB0301104]
- National Natural Science Foundation of China [51531002, 51301173, 51601193, 51701218]
- National Science and Technology Major Project of China [2017ZX04014001]
- National Basic Research Program of China (973 Program) [2013CB632202]
Ask authors/readers for more resources
The loading rate significantly affects the mechanical properties of Mg alloys. However, the effects of strain rate on newly developed Mg-Gd-Y alloys at room temperature (RT) have rarely been investigated. Here, uniaxial tensile tests were conducted on a cast Mg-10Gd-3Y-0.52r (wt. %) alloy (GW103) in both as-aged and as-solutionized states with different grains sizes at RT and various strain rates. The results showed an anomalous positive strain-rate dependence of elongation in all the GW103 alloys investigated from 1 x 10(-5) to 1 x 10(-1) s(-1). Careful microstructural characterization by slip trace analysis revealed that the exclusive deformation mechanism of pyramidal slip, non-Schmid behavior of basal slip, and slip transfer at 1 x 10(-1) s(-1); these induced the high RT ductility. The occurrence of pyramidal slip activity at high strain rates was suggested to be associated with rare earth solutes, fine precipitates, and local high stresses at grain boundaries due to dislocation pile-up. It was proposed that the increasing strain rate was approximately equivalent to decreases in grain size, enabling the generation of local stresses at grain boundaries, thus causing this anomalous phenomenon. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available