Fabrication and characterization of nanostructured immiscible Cu–Ta alloys processed by high-pressure torsion

Tayebeh Mousavi , Jiaoyan Dai , Piotr Bazarnik , Pedro Henrique R. Pereira , Yi Huang , Małgorzata Lewandowska , Terence G. Langdon

Abstract

Nanostructured CueTa alloys show great potential as high strength nanocrystalline materials due to their excellent mechanical properties and limited grain growth at high temperatures. This report describes the fabrication of nanostructured immiscible CueTa alloys in bulk by high-pressure torsion (HPT) using a stack of Cu/Ta/Cu discs at room temperature. A microstructural study after HPT processing showed that the internal Ta layer breaks into small individual flakes which distribute uniformly over the Cu matrix through increases in the numbers of HPT turns. There is solid-state diffusion between the Cu and Ta when the HPT processing increases to 100 turns due to microstructural refinement and increasing crystalline defects. After processing through 150 turns, a composite microstructure of two phases is formed including supersaturated CueTa solid solutions (Cu81Ta19 and Ta78Cu22 alloys) with a crystallite size of ~35e45 nm. This fine microstructure produces exceptional mechanical properties including a high hardness of over 350 Hv corresponding to ~3.43 GPa, a tensile strength of ~1300 MPa and a tensile elongation of about 40%.
Author Tayebeh Mousavi - University of Oxford (UO)
Tayebeh Mousavi,,
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, Jiaoyan Dai - Ningbo University of Technology
Jiaoyan Dai,,
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, Piotr Bazarnik (FMSE / DMD)
Piotr Bazarnik,,
- Division of Materials Design
, Pedro Henrique R. Pereira - Universidade Federal de Minas Gerais
Pedro Henrique R. Pereira,,
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, Yi Huang - Bournemouth University, Poole
Yi Huang,,
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, Małgorzata Lewandowska (FMSE / DMD)
Małgorzata Lewandowska,,
- Division of Materials Design
, Terence G. Langdon - University of Southampton
Terence G. Langdon,,
-
Journal seriesJournal of Alloys and Compounds, ISSN 0925-8388, e-ISSN 1873-4669
Issue year2020
Vol832
Pages1-8
Publication size in sheets7750.35
Keywords in EnglishCu-Ta alloys; High-pressure torsion; Nanostructured materials; Immiscible solid solution; Severe plastic deformation
ASJC Classification2210 Mechanical Engineering; 2211 Mechanics of Materials; 2505 Materials Chemistry; 2506 Metals and Alloys
DOIDOI:10.1016/j.jallcom.2020.155007
URL https://www.x-mol.com/paper/1247285977489018880
Languageen angielski
File
2020 JALCOM Cu-Ta.pdf 2 MB
Score (nominal)100
Score sourcejournalList
ScoreMinisterial score = 100.0, 09-06-2020, ArticleFromJournal
Publication indicators Scopus Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.386; WoS Impact Factor: 2018 = 4.175 (2) - 2018=3.624 (5)
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