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Journal of Materials Science

, Volume 43, Issue 6, pp 1749–1756 | Cite as

Mechanical testing of titanium/aluminium–silicon interfaces by push-out

  • Olivier DezellusEmail author
  • Lucile Milani
  • Françoise Bosselet
  • Myriam Sacerdote-Peronnet
  • Dominique Rouby
  • Jean-Claude Viala
Article

Abstract

Mechanical properties of Ti/Al–7Si assemblies produced by insert moulding were studied with a classical push-out test and a variant that is the circular-bending test. Special care has been taken for controlling both the reactivity at the Ti/Al–7Si interface and the metallurgical health of the Al–7Si matrix. Mechanical tests until complete debonding have been completed with interrupted tests, metallographic characterizations and FEM analysis of elastic stress state. A mean shear strength of the interface of about 120 MPa was obtained. When the Ti insert is solely fretted in the matrix, without chemical interaction between Ti and the Al–7Si alloy, the mean shear strength is significantly lower (48 MPa). This result clearly shows that chemical interaction at the interface (formation of a thin TiSi layer at the Ti side and a thick Al3Ti(Si) layer at the Al–7Si alloy side) improves the mechanical properties of the assembly. It is also shown that the failure sequence is characterized both by crack propagation from bottom to top and matrix yielding from top to bottom. Actually, interface damaging begins by crack initiation at the specimen bottom face (not at the top face and under the indenter) in a nearly pure mode I solicitation at a radial tensile stress of about 100 MPa.

Keywords

Acoustic Emission Crack Initiation Al3Ti Acoustic Emission Event Pure Mode 

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Olivier Dezellus
    • 1
    Email author
  • Lucile Milani
    • 1
  • Françoise Bosselet
    • 1
  • Myriam Sacerdote-Peronnet
    • 1
  • Dominique Rouby
    • 2
  • Jean-Claude Viala
    • 1
  1. 1.Université Claude Bernard Lyon 1, LMI – UMR CNRS No 5615Villeurbanne CedexFrance
  2. 2.INSA-Lyon, GEMPPM – UMR CNRS No 5510Villeurbanne CedexFrance

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