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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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


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