Hardening of pure metals by high pressure torsion: a physically-based model employing volume averaged defect evolutions
Hardening of pure metals by high pressure torsion: a physically-based model employing volume averaged defect evolutions
A physically based model to predict the increment of hardness and grain refinement of pure metals due to severe plastic deformation by high-pressure torsion (HPT) is proposed. The model incorporates volume-averaged thermally activated dislocation annihilation and grain boundary formation. Strengthening is caused by dislocations in the grain and by grain boundaries. The model is tested against a database containing all available reliable data on HPT-processed pure metals. It is shown that the model accurately predicts hardening and grain size of the pure metals, irrespective of crystal structure (face-centred cubic, body-centred cubic and hexagonal close packed). Measured dislocation densities also show good correlation with predictions. The influence of stacking fault energy on hardening is very weak (of the order of ?0.03 GPa per 100 J mol?1).
dislocations, metals, pure metals, bcc, fcc, hpt, aluminium, titatium, iron, zinv, tantalum, magnesium, niobium, strengthening, HPT, deformation, SPD, shear modulus, grain size, grain refinement
183-192
Starink, Marco J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Cheng, Xiaoyu
9f6337a6-c459-4b47-87fb-3adf0d981ef6
Yang, Shoufeng
e0018adf-8123-4a54-b8dd-306c10ca48f1
January 2013
Starink, Marco J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Cheng, Xiaoyu
9f6337a6-c459-4b47-87fb-3adf0d981ef6
Yang, Shoufeng
e0018adf-8123-4a54-b8dd-306c10ca48f1
Starink, Marco J., Cheng, Xiaoyu and Yang, Shoufeng
(2013)
Hardening of pure metals by high pressure torsion: a physically-based model employing volume averaged defect evolutions.
Acta Materialia, 61 (1), .
(doi:10.1016/j.actamat.2012.09.048).
Abstract
A physically based model to predict the increment of hardness and grain refinement of pure metals due to severe plastic deformation by high-pressure torsion (HPT) is proposed. The model incorporates volume-averaged thermally activated dislocation annihilation and grain boundary formation. Strengthening is caused by dislocations in the grain and by grain boundaries. The model is tested against a database containing all available reliable data on HPT-processed pure metals. It is shown that the model accurately predicts hardening and grain size of the pure metals, irrespective of crystal structure (face-centred cubic, body-centred cubic and hexagonal close packed). Measured dislocation densities also show good correlation with predictions. The influence of stacking fault energy on hardening is very weak (of the order of ?0.03 GPa per 100 J mol?1).
Text
Starink et al 2013 Hardening of pure metals by HPT.pdf
- Author's Original
More information
e-pub ahead of print date: 12 October 2012
Published date: January 2013
Keywords:
dislocations, metals, pure metals, bcc, fcc, hpt, aluminium, titatium, iron, zinv, tantalum, magnesium, niobium, strengthening, HPT, deformation, SPD, shear modulus, grain size, grain refinement
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 343292
URI: http://eprints.soton.ac.uk/id/eprint/343292
ISSN: 1359-6454
PURE UUID: 2bda25ad-c6c7-415b-9695-588c12434d55
Catalogue record
Date deposited: 03 Oct 2012 10:06
Last modified: 14 Mar 2024 12:02
Export record
Altmetrics
Contributors
Author:
Xiaoyu Cheng
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics
