Processing and characterization of TiB 2 ‐TiNiFeCrCoAl high‐entropy alloy composite

Fu, Zhezhen; Koc, Rasit

doi:10.1111/jace.14814

Processing and characterization of TiB ₂ ‐TiNiFeCrCoAl high‐entropy alloy composite

Journal Article · Mon Apr 03 00:00:00 EDT 2017 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/jace.14814· OSTI ID:1401776

Fu, Zhezhen ^[1]; Koc, Rasit ^[1]

Department of Mechanical Engineering and Energy Processes Southern Illinois University Carbondale Illinois

Abstract

A series of TiB ₂ ‐TiNiFeCrCoAl high‐entropy alloy ( HEA ) composites with HEA contents of 5, 10, and 20 wt.% were fabricated to a relative density of above 95% without applied external pressure at 1550°C in flowing argon. Research indicates (i) the formation of liquid HEA is promoted with the assistance of an optimized ball mill process, which facilitates the sintering through a liquid phase sintering mechanism, and (ii) HEA can react with the oxide impurities in TiB ₂ and can consequently enhance the densification. Continual observations on microstructures and properties indicate that the sintered composites have a submicronmeter grain size of 0.90±0.11, 0.79±0.09, and 0.74±0.07 μm; a high hardness of 23.3±0.9, 21.6±1.0, and 17.5±1.2 GPa; and a high indentation fracture toughness of 8.7±0.4, 11.1±0.6, and 12.8±0.6 MPa·m ^1/2 , respectively, for samples with 5, 10, and 20 wt.% HEA . The addition of HEA to TiB ₂ can significantly enhance the densification, results in fine microstructures, and improve the mechanical performance.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FE0008864

OSTI ID:: 1401776

Alternate ID(s):: OSTI ID: 1536752

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 7 Vol. 100; ISSN 0002-7820

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United States

Language:: English

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