Annealing-induced abnormal hardening in nanocrystalline NbMoTaW high-entropy alloy thin films

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

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Detail(s)

Original languageEnglish
Article number128097
Journal / PublicationMaterials Letters
Volume275
Online published5 Jun 2020
Publication statusPublished - 15 Sept 2020

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DOI

DOI
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Link to Scopus https://www.scopus.com/record/display.uri?eid=2-s2.0-85086140261&origin=recordpage
Permanent Link https://scholars.cityu.edu.hk/en/publications/publication(f17bc6c8-354c-4e3f-8d06-c0c73882320a).html

Abstract

High temperature annealing of high-entropy alloys (HEA) typically results in reduced hardness due to grain coarsening, limiting its potential for applications at elevated temperatures. However, in this work, our nanocrystalline NbMoTaW HEA thin film exhibits enhanced hardness up to ∼ 17.1 GPa after isothermal annealing at 800 °C for ∼ 6 h (hrs). This phenomenon can be explained mainly by the formation of amorphous intergranular films (AIFs). This work does not only demonstrate a high-performance HEA film for potential high-temperature applications, but also provides a practical approach to tailor mechanical properties of nanostructured HEAs.

Research Area(s)

  • High-entropy alloy (HEA), Thin film, Thermal properties, Nanocrystalline, Mechanical properties, Grain boundary

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Publication fingerprints text

100
Thin Films Material Science
100
Nanocrystalline Material Science
100
High Entropy Alloys Material Science
100
Annealing Keyphrases
100
High-entropy Alloy Keyphrases
100
NbMoTaW Keyphrases
100
alloys INIS
100
thin films INIS
100
annealing INIS
100
hardening INIS
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Citation Format(s)

[ RIS ] [ BibTeX ]
Annealing-induced abnormal hardening in nanocrystalline NbMoTaW high-entropy alloy thin films. / Feng, Xiaobin; Surjadi, James Utama; Lu, Yang.
In: Materials Letters, Vol. 275, 128097, 15.09.2020.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review