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

Xiaobin Feng; James Utama Surjadi; Yang Lu

doi:10.1016/j.matlet.2020.128097

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

Xiaobin Feng
, James Utama Surjadi
, Yang Lu^*

^*Corresponding author for this work

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

23 Citations (Scopus)

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.

Original language	English
Article number	128097
Journal	Materials Letters
Volume	275
Online published	5 Jun 2020
DOIs	https://doi.org/10.1016/j.matlet.2020.128097
Publication status	Published - 15 Sept 2020

Research Keywords

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

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10.1016/j.matlet.2020.128097

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@article{f17bc6c8354c4e3f8d06c0c73882320a,

title = "Annealing-induced abnormal hardening in nanocrystalline NbMoTaW high-entropy alloy thin films",

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.",

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

author = "Xiaobin Feng and Surjadi, \{James Utama\} and Yang Lu",

year = "2020",

month = sep,

day = "15",

doi = "10.1016/j.matlet.2020.128097",

language = "English",

volume = "275",

journal = "Materials Letters",

issn = "0167-577X",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Annealing-induced abnormal hardening in nanocrystalline NbMoTaW high-entropy alloy thin films

AU - Feng, Xiaobin

AU - Surjadi, James Utama

AU - Lu, Yang

PY - 2020/9/15

Y1 - 2020/9/15

N2 - 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.

AB - 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.

KW - High-entropy alloy (HEA)

KW - Thin film

KW - Thermal properties

KW - Nanocrystalline

KW - Mechanical properties

KW - Grain boundary

UR - https://www.scopus.com/pages/publications/85086140261

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85086140261&origin=recordpage

U2 - 10.1016/j.matlet.2020.128097

DO - 10.1016/j.matlet.2020.128097

M3 - RGC 21 - Publication in refereed journal

SN - 0167-577X

VL - 275

JO - Materials Letters

JF - Materials Letters

M1 - 128097

ER -

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

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

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Research Keywords

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CRF: Three-dimensional (3D) Atom Probe Facility for Characterization of Advanced Materials Research at Atomic- and Nano-scales

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