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

O. T. Kingstedt, B. P. Eftink, I. M. Robertson, J. Lambros

Research output: Contribution to journalArticle

Abstract

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) 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.

Original languageEnglish (US)
Pages (from-to)273-283
Number of pages11
JournalActa Materialia
Volume105
DOIs
StatePublished - Feb 15 2016

Keywords

  • Ag-Cu
  • Dynamic plastic deformation
  • Eutectic
  • Interface structure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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