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A novel High-Entropy Alloy-based composite material / Sephira Riva, Adam Tudball, Shahin Mehraban, Nicholas Lavery, Stephen G.R. Brown, Kirill V. Yusenko, Steve Brown

Journal of Alloys and Compounds, Volume: 730, Pages: 544 - 551

Swansea University Authors: Nicholas Lavery, Steve Brown

Abstract

This study reports the results of the addition of different reinforcing agents (i.e. nano-diamonds, SiC, Sc2O3, h-BN, c-BN and CN) on the sintering process of the B2-structured Al2CoCrFeNi High-Entropy Alloy. The best candidate for further thermal, electrical and mechanical characterization was chos...

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Published in: Journal of Alloys and Compounds
ISSN: 0925-8388
Published: 2018
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa35713
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Abstract: This study reports the results of the addition of different reinforcing agents (i.e. nano-diamonds, SiC, Sc2O3, h-BN, c-BN and CN) on the sintering process of the B2-structured Al2CoCrFeNi High-Entropy Alloy. The best candidate for further thermal, electrical and mechanical characterization was chosen to be the alloy containing 2 wt% nano-diamonds. The composite was prepared using spark-plasma sintering of pre-alloyed powders and characterized with SEM-EDX, DSC, Laser Flash Analysis (LFA), electrical conductivity and Seebeck coefficient, dilatometry, Young's modulus, Vicker's hardness, 3-points flexural test. It shows unexpectedly low thermal expansion coefficient (from 3×10−6 to 17×10−6 K−1 between RT and 500 °C), high electrical resistivity and Seebeck coefficient and hardness comparable to the sintered blank Al2CoCrFeNi.
Keywords: High-entropy alloys; Metal matrix composites; Spark plasma sintering; Nano-diamonds composite; Thermo-electric properties
College: College of Engineering
Start Page: 544
End Page: 551