Journal
MATERIALS LETTERS
Volume 237, Issue -, Pages 65-68Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2018.11.080
Keywords
Wrought Mg alloy; Grain size; Segregations; Recrystallization; Strength properties
Funding
- National Key Research and Development Program of China [2016YFB0701200]
- National Natural Science Foundation of China [51525101, U1610253, 51501032, 51701033]
- State Key Laboratory of Solidification Processing in NWPU [SKLSP201738]
- Open Research Subject of Key Laboratory (Research Base) [szjj2017-018]
- Fundamental Research Funds for the Central Universities [N170204011]
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We reported that the Mg-Ca dilute alloys can exhibit ultra-fine grain size (less than 1 um) and the exceptionally high yield strength, e.g., similar to 290 MPa in the Mg-0.1 wt% Ca alloy and similar to 377 MPa in Mg-1.0 wt% Ca alloy, achieved by conventional one-step extrusion. Both increased activations of non-basal slips due to Ca addition and the dynamic partitioning of Ca atoms during extrusion are believed to play the critical role in facilitating formation of the submicron matrix grains. Multi-scale substructures, including the ultrafine recrystallized grains, the mono-dispersive Mg-2 Ca nano-phases, residual dislocations and Ca enriched sub-grain boundaries contribute to the high strength. (C) 2018 Elsevier B.V. All rights reserved.
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