Simultaneous amorphous and nanocrystalline surface layers formation in tantalum by high-temperature ultrasonic nanocrystal surface modification treatment

A. Amanov

doi:10.1016/j.matlet.2026.141166

Simultaneous amorphous and nanocrystalline surface layers formation in tantalum by high-temperature ultrasonic nanocrystal surface modification treatment

A. Amanov

Materials Science and Environmental Engineering

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Abstract

High-temperature ultrasonic nanocrystal surface modification (HT-UNSM) at 450 °C was applied to tantalum (Ta) to induce severe surface plastic deformation (S²PD), producing a simultaneous amorphous/nanocrystalline layer confirmed by transmission electron microscopy (TEM) and fast Fourier transform (FFT) diffraction analysis. X-ray diffraction (XRD) further confirmed nanocrystallization of the α-Ta phase and complete elimination of the metastable β-Ta phase. The duplex architecture is attributed to extreme contact-pressure-driven amorphization at the surface and thermally-assisted dynamic nanocrystallization in the subsurface, demonstrating HT-UNSM as an effective strategy for tailoring near-surface microstructure and mechanical performance.

Original language	English
Article number	141166
Journal	Materials Letters
Volume	420
DOIs	https://doi.org/10.1016/j.matlet.2026.141166
Publication status	E-pub ahead of print - 25 Jun 2026
Publication type	A1 Journal article-refereed

Keywords

Amorphization
High-temperature UNSM
Nanocrystallization
SPD
Tantalum

Publication forum classification

Publication forum level 1

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.matlet.2026.141166Licence: CC BY

Simultaneous amorphous and nanocrystalline surface layers formation in tantalum by high-temperature ultrasonic nanocrystal surface modification treatmentFinal published version, 882 KBLicence: CC BY

https://urn.fi/URN:NBN:fi:tuni-202607288538Licence: CC BY

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title = "Simultaneous amorphous and nanocrystalline surface layers formation in tantalum by high-temperature ultrasonic nanocrystal surface modification treatment",

abstract = "High-temperature ultrasonic nanocrystal surface modification (HT-UNSM) at 450 °C was applied to tantalum (Ta) to induce severe surface plastic deformation (S2PD), producing a simultaneous amorphous/nanocrystalline layer confirmed by transmission electron microscopy (TEM) and fast Fourier transform (FFT) diffraction analysis. X-ray diffraction (XRD) further confirmed nanocrystallization of the α-Ta phase and complete elimination of the metastable β-Ta phase. The duplex architecture is attributed to extreme contact-pressure-driven amorphization at the surface and thermally-assisted dynamic nanocrystallization in the subsurface, demonstrating HT-UNSM as an effective strategy for tailoring near-surface microstructure and mechanical performance.",

keywords = "Amorphization, High-temperature UNSM, Nanocrystallization, SPD, Tantalum",

author = "A. Amanov",

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doi = "10.1016/j.matlet.2026.141166",

language = "English",

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T1 - Simultaneous amorphous and nanocrystalline surface layers formation in tantalum by high-temperature ultrasonic nanocrystal surface modification treatment

AU - Amanov, A.

PY - 2026/6/25

Y1 - 2026/6/25

N2 - High-temperature ultrasonic nanocrystal surface modification (HT-UNSM) at 450 °C was applied to tantalum (Ta) to induce severe surface plastic deformation (S2PD), producing a simultaneous amorphous/nanocrystalline layer confirmed by transmission electron microscopy (TEM) and fast Fourier transform (FFT) diffraction analysis. X-ray diffraction (XRD) further confirmed nanocrystallization of the α-Ta phase and complete elimination of the metastable β-Ta phase. The duplex architecture is attributed to extreme contact-pressure-driven amorphization at the surface and thermally-assisted dynamic nanocrystallization in the subsurface, demonstrating HT-UNSM as an effective strategy for tailoring near-surface microstructure and mechanical performance.

AB - High-temperature ultrasonic nanocrystal surface modification (HT-UNSM) at 450 °C was applied to tantalum (Ta) to induce severe surface plastic deformation (S2PD), producing a simultaneous amorphous/nanocrystalline layer confirmed by transmission electron microscopy (TEM) and fast Fourier transform (FFT) diffraction analysis. X-ray diffraction (XRD) further confirmed nanocrystallization of the α-Ta phase and complete elimination of the metastable β-Ta phase. The duplex architecture is attributed to extreme contact-pressure-driven amorphization at the surface and thermally-assisted dynamic nanocrystallization in the subsurface, demonstrating HT-UNSM as an effective strategy for tailoring near-surface microstructure and mechanical performance.

KW - Amorphization

KW - High-temperature UNSM

KW - Nanocrystallization

KW - SPD

KW - Tantalum

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DO - 10.1016/j.matlet.2026.141166

M3 - Article

AN - SCOPUS:105042775883

SN - 0167-577X

VL - 420

JO - Materials Letters

JF - Materials Letters

M1 - 141166

ER -

Simultaneous amorphous and nanocrystalline surface layers formation in tantalum by high-temperature ultrasonic nanocrystal surface modification treatment

Abstract

Keywords

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