Additive manufacturing of an aluminum matrix composite reinforced with nanocrystalline high-entropy alloy particles

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 679; pp. 193 - 203
• Main Authors: Karthik, G.M., Panikar, Santhanu, Ram, G.D. Janaki, Kottada, Ravi Sankar
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 02.01.2017; Elsevier BV
• Subjects: Additive manufacturing; Additives; Alloys; Aluminum base alloys; Aluminum matrix composites; Ceramic matrix composites; Entropy; Friction; Friction deposition; High entropy alloys; High-entropy alloy; Magnesium base alloys; Metal matrix composite; Metal matrix composites; Nanocrystals; Particulate composites; Reinforcement; Friction deposition; Additive manufacturing; Metal matrix composite; High-entropy alloy
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2016.10.038

In the present work, a metal-metal composite consisting of aluminum-magnesium alloy AA5083 matrix and nanocrystalline CoCrFeNi high-entropy alloy reinforcement particles in 12vol% was successfully friction deposited in multiple layers. The layer interfaces or the reinforcement/matrix interfaces showed no brittle intermetallic formation – thanks to the inert nature as well as the high strength and hardness of the high-entropy alloy reinforcement particles. The composite showed significantly higher tensile and compressive strengths as compared to standard wrought-processed alloy AA5083-H112 and offered a much better combination of strength and ductility when compared to conventional aluminum matrix composites reinforced with ceramic particles. The current study establishes friction deposition as a viable technique for additive manufacturing of novel high-performance composite materials.