Benoit Malard

The scientific project of this thesis will be focused on the study of the mechanically induced martensite transformation in a copper based shape memory alloy. The aim is to relate the mechanical and metallurgical states of these SMAs on different length scales. The diffraction results obtained from the bulk will be compared to surface studies performed on the same type of alloy at the LPMM [1]. There will be three different steps in the process of the multi-scale analysis:

• The first step involves the analysis of small-grain alloys in order to obtain average data of the bulk volume for each phase (texture, strain distributions, evolution of the volume fractions).
• The second step takes us down to the scale of the grain aggregates, with a study of the strain state and volume fraction of each phase, using specimens identical in metallurgy but which have undergone thermal treatment increasing their grain size.
• In a third and final step, we will measure the martensite transformation on large-grain polycrystalline specimens and on single crystals, in order to determine both the local mechanical incompatibilities and the curvature and mosaic structure of the lattice.

Recent publications

• B. Malard, T. Pirling, K. Inal, E. Patoor, S. Berveiller
  Stress determination during the mechanically-induced martensite phase transformation in the superelastic alloy CuAlBe by neutron diffraction.
  Paper accepted to ECRS7 Berlin (2006).
• N. Ratel, D. J. Hughes, A. King, B. Malard, Z. Chen, P. Busby, P. J. Webster.
  Review of scientific instrument 76,1 (2005)
  Direct sample positioning and alignment methodology for strain measurement by diffraction.
• P. J. Webster, M. Neil James, S.-P. Ting, Z. Chen, D. Hughes, A. Steuwer, B. Malard, N. Ratel.
  ASME 2004 , USA, (2004)
  Engineering Applications of Synchrotron X-Rays and Neutrons and the FaME38 project.
• G. Bruno, C. Fanara, F. Guglielmetti, B. Malard
  Surface & Coatings Technology (2005)
  Characterization and residual stress analysis of wear resistant Mo thermal spray-coated steel gear wheels
• D. J. Hughes, P. J. Webster, B. Malard, N. Ratel, H. Sitepu and A. Dale.
  MECA-SENS2, Manchester, Sept. 2003.
  FaME38 : A New Approach to Materials Science at the ILL-ESRF.
• G. Bruno, B. Malard, N. Ratel, D. J. Hughes and T. Pirling.
  November 2003 (ICRS7)
  Application of advanced engineering tools for optimization of a residual stress beamline.
• B. Malard, D. J. Hughes.
  G.F.A.C 2002 de l'ENSAM Metz et Le colloque RX et Matière 2003 de l'INSA Strasbourg.
  FaME38, laboratoire dédié à l'ingénierie des matériaux.

More information

• Curriculum Vitae: French and English versions
• Implication associative:
  • Association des Petits Débrouillards: Ass. Française, Ass. Rhône-Alpes

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