Abstract
The present study reports the development of new magnesium composites containing complex composition alloy (CCA) particles. Materials were synthesized using a powder metallurgy route incorporating hybrid microwave sintering and hot extrusion. The presence and variation in the amount of ball-milled CCA particles (2.5 wt %, 5 wt %, and 7.5 wt %) in a magnesium matrix and their effect on the microstructure and mechanical properties of Mg-CCA composites were investigated. The use of CCA particle reinforcement effectively led to a significant matrix grain refinement. Uniformly distributed CCA particles were observed in the microstructure of the composites. The refined microstructure coupled with the intrinsically high hardness of CCA particles (406 HV) contributed to the superior mechanical properties of the Mg-CCA composites. A microhardness of 80 HV was achieved in a Mg-7.5HEA (high entropy alloy) composite, which is 1.7 times higher than that of pure Mg. A significant improvement in compressive yield strength (63%) and ultimate compressive strength (79%) in the Mg-7.5CCA composite was achieved when compared to that of pure Mg while maintaining the same ductility level. When compared to ball-milled amorphous particle-reinforced and ceramic-particle-reinforced Mg composites, higher yield and compressive strengths in Mg-CCA composites were achieved at a similar ductility level.
Highlights
Magnesium (Mg) is the lightest of all structural metals and possesses the highest strength-to-density ratio
Based on on the the interrelation interrelation between between the the microstructural microstructural evolution evolution and and mechanical mechanical properties properties of of the composites developed in this work, conclusions are drawn as follows: the Mg-complex composition alloy (CCA) composites developed in this work, conclusions are drawn as follows: 1
The addition of ball-milled CCA reinforcement particles assisted in a significant refinement of
Summary
Magnesium (Mg) is the lightest of all structural metals and possesses the highest strength-to-density ratio. Magnesium (Mg) is the lightest of all structural metals and possesses the highest strength-to. Magnesium is the designers’ choice for possible production of lightweight vehicles to meet the demand of reducing greenhouse emissions [1,2,3]. Magnesium is mostly used in the form of alloys in commercial applications [4,5]. With the advent of composite technology, research interest has been placed on the development of high-performance magnesium composites. By a careful selection of matrix and reinforcing phases, newly formed composite materials with significant improvements in elastic modulus, strength, ductility, and coefficient of thermal expansion can be fabricated. Composite materials are attractive because they offer the possibility for combining useful engineering properties of individual elements, which is otherwise not possible from monolithic materials. The attractive physical and mechanical properties obtained from metal
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