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Influence of solid solution strengthening on the local mechanical properties of single crystal and ultrafine-grained binary Cu-AlX solid solutions

Maier-Kiener, V. and An, X. and Li, L. and Zhang, Z. and Pippan, R. and Durst, Karsten (2017):
Influence of solid solution strengthening on the local mechanical properties of single crystal and ultrafine-grained binary Cu-AlX solid solutions.
In: Journal of Materials Research, Cambridge University Press, pp. 4583-4591, 32, (24), ISSN 0884-2914,
[Online-Edition: https://doi.org/10.1557/jmr.2017.320],
[Article]

Abstract

In this work, the influence of Al-solutes on the mechanical behavior of Cu–AlX solid solutions has been studied using indentation strain rate jump tests for single crystalline and ultrafine-grained (UFG) microstructures from high pressure torsion (HPT) processing. Al-solutes in Cu classically lead to a solid solution strengthening, coupled with a decrease in stacking fault energy, which influences also the grain size after HPT processing. For all alloys, a higher hardness is found at lower indentation depths, which can be nicely described by a modified Nix/Gao model down to 100 nm indentation depth. Among the single crystals, the largest size effects are found for the higher solute contents, indicating a stronger work hardening at small length scales for the solid solutions. The dilute UFG solid solutions showed a strong softening after a strain rate reduction test, with a pronounced transient region. Cu–Al15 is, however, quite stable, showing abrupt changes in hardness without strong transients. This indicates that solute solution strengthening does not only influence the indentation size effect and structure formation during HPT processing but also stabilizes the grain structure during subsequent deformation.

Item Type: Article
Erschienen: 2017
Creators: Maier-Kiener, V. and An, X. and Li, L. and Zhang, Z. and Pippan, R. and Durst, Karsten
Title: Influence of solid solution strengthening on the local mechanical properties of single crystal and ultrafine-grained binary Cu-AlX solid solutions
Language: English
Abstract:

In this work, the influence of Al-solutes on the mechanical behavior of Cu–AlX solid solutions has been studied using indentation strain rate jump tests for single crystalline and ultrafine-grained (UFG) microstructures from high pressure torsion (HPT) processing. Al-solutes in Cu classically lead to a solid solution strengthening, coupled with a decrease in stacking fault energy, which influences also the grain size after HPT processing. For all alloys, a higher hardness is found at lower indentation depths, which can be nicely described by a modified Nix/Gao model down to 100 nm indentation depth. Among the single crystals, the largest size effects are found for the higher solute contents, indicating a stronger work hardening at small length scales for the solid solutions. The dilute UFG solid solutions showed a strong softening after a strain rate reduction test, with a pronounced transient region. Cu–Al15 is, however, quite stable, showing abrupt changes in hardness without strong transients. This indicates that solute solution strengthening does not only influence the indentation size effect and structure formation during HPT processing but also stabilizes the grain structure during subsequent deformation.

Journal or Publication Title: Journal of Materials Research
Volume: 32
Number: 24
Publisher: Cambridge University Press
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy
Date Deposited: 18 Jul 2018 14:18
Official URL: https://doi.org/10.1557/jmr.2017.320
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