Enhancing Aluminum Matrix Composites With High‐Entropy Alloys: A Study of Mechanical, Thermal, and Electrical Properties via Powder Metallurgy

Abstract

ABSTRACT This study investigates the incorporation of high‐entropy alloys (HEAs) into aluminum matrix composites (AMCs) via powder metallurgy to improve their mechanical, thermal, and electrical properties. Significant improvements in mechanical performance were observed by systematically varying HEA content from 0% to 30%. At 30 wt.% HEA, the composite exhibited a 37.95% increase in bulk modulus and a 33.57% rise in Young's modulus compared to pure aluminum. Microhardness improved by approximately 60%, attributed to interfacial bonding, dispersion strengthening, and grain refinement. However, increased HEA content led to higher porosity, which slightly diminished physical transport properties such as electrical and thermal conductivity, decreasing by 16.9% and 33.3%, respectively. Thermal expansion was reduced with increasing entropy content, indicating enhanced dimensional stability. Advanced sintering techniques under argon atmosphere helped mitigate porosity and improve interfacial interactions. These findings highlight the potential of HEA‐reinforced AMCs as lightweight, high‐performance materials for aerospace, automotive, and high‐temperature applications where mechanical strength and stability are critical.