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Anisotropic dynamic compression response of a directionally-cast silver–copper eutectic alloy

Kingstedt, O. T. and Eftink, B. P. and Robertson, I. M. and Lambros, J. (2016) Anisotropic dynamic compression response of a directionally-cast silver–copper eutectic alloy. Acta Materialia, 105 . pp. 273-283. ISSN 1359-6454. doi:10.1016/j.actamat.2015.12.024.

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At the eutectic composition, the silver–copper bi-phase system can be produced such that the Cu phase forms as discontinuous reinforcements within a silver matrix. The reinforcements and matrix have a 101 growth direction along the axial direction of the produced material. This work examines the compressive deformation response of four such unidirectional Ag–Cu materials with nominal, bilayer thickness of 3.6 μm, 2.2 μm, 1.1 μm and 500 nm. From the cast material, specimens were machined to investigate the material response parallel (0°) to the 〈101〉〈101〉 growth direction, 45° to the growth direction, and perpendicular (90°) to the growth direction. Specimens were loaded dynamically under compression using a split-Hopkinson pressure bar. The strength response of the unidirectional material was found to increase as the bilayer thickness decreased with the 0° orientation having the greatest strength followed by the 90° orientation then the 45° orientation. Deformation mechanisms were examined using postmortem microscopy. The orientation dependent strength and strain hardening are attributed to slip system orientations, deformation twinning, and the Ag–Cu interface structure.

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Additional Information:© 2015 Acta Materialia Inc. Published by Elsevier Ltd. Received 23 October 2015. Received in revised form 5 December 2015. Accepted 13 December 2015. Available online 9 January 2016. This work was supported by a grant from the National Nuclear Security Administration of the Department of Energy (DE-FG52-09NA29463). Scanning Electron Microscopy imaging was carried out in part in the Frederick Seitz Materials Research Laboratory Central Facilities, University of Illinois. Casting of the material was done with the assistance of Dr. Doug Safarik at Los Alamos National Laboratory.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG52-09NA29463
Subject Keywords:Eutectic; Ag–Cu; Dynamic plastic deformation; Interface structure
Record Number:CaltechAUTHORS:20160201-141050536
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Official Citation:O.T. Kingstedt, B.P. Eftink, I.M. Robertson, J. Lambros, Anisotropic dynamic compression response of a directionally-cast silver–copper eutectic alloy, Acta Materialia, Volume 105, 15 February 2016, Pages 273-283, ISSN 1359-6454, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64134
Deposited By: Ruth Sustaita
Deposited On:01 Feb 2016 23:37
Last Modified:10 Nov 2021 23:26

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