Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 810, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.151909
Keywords
Magnesium; High entropy alloy; Recrystallization; Mechanical properties; Yield asymmetry
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Funding
- Ministry of Education Academic Research Funding [R-265-000-586-114]
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This work presents the use of equiatomic high entropy alloy (HEA) particles as unconventional reinforcement phase in Mg matrix. Mg-HEA composites were fabricated by powder metallurgy method incorporating microwave sintering and hot extrusion. Recrystallized fine grains (similar to 50% reduction) were observed in all the composites due to the capability of HEA particles to serve as nucleation sites and for grain boundary pinning following extrusion. Grain refinement coupled with intrinsic high hardness of HEA particles led to an improvement in hardness of 47%, 51% and 54% in Mg-2.5wt% HEA, Mg-5 wt.% HEA and Mg-7.5 wt% HEA composites, respectively. In comparison with traditional micron size reinforced composites, Mg-HEA composites displayed superior hardness improvement. In addition, HEA reinforcement particles also enhanced both tensile and compressive strengths of magnesium with marginally compromised tensile ductility and marginally enhanced compressive ductility. Relatively strong fiber texture of extruded pure Mg was weakened in the composites due to the presence of HEA particles effectively reducing the yield asymmetry to near unity in Mg-5 wt.% HEA and Mg-7.5wt% HEA composites. (C) 2019 Elsevier B.V. All rights reserved.
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