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@ARTICLE{Campbell:848066,
      author       = {Campbell, J. E. and Kalfhaus, T. and Vassen, R. and
                      Thompson, R. P. and Dean, J. and Clyne, T. W.},
      title        = {{M}echanical properties of sprayed overlayers on superalloy
                      substrates, obtained via indentation testing},
      journal      = {Acta materialia},
      volume       = {154},
      issn         = {1359-6454},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2018-03349},
      pages        = {237 - 245},
      year         = {2018},
      abstract     = {This paper concerns the use of a recently-developed
                      methodology for inferring stress-strain curves from
                      indentation data, based on iterative FEM simulation of the
                      procedure. A relatively large indenter (2 mm diameter) is
                      used, with deep penetration (to about $25\%$ of the indenter
                      radius). This has been carried out on (polished) free
                      surfaces of sprayed superalloy overlayers on single crystal
                      superalloy substrates. Both load-displacement data and
                      residual indent profiles were obtained, with the overlayers
                      being in two different conditions (as-sprayed and annealed).
                      The overlayers were relatively thick (∼2.5 mm), so it
                      was also possible to carry out uniaxial compression tests on
                      them (in the through-thickness direction). The inferred
                      stress-strain curves were similar in each case when derived
                      from load-displacement data and indent profiles, and also
                      close to the plots obtained by conventional uniaxial
                      testing. The yield stress levels in both cases were around
                      1000 MPa, but the work hardening rate was significantly
                      higher for the as-sprayed material. This kind of information
                      is of considerable potential value when attempting to
                      optimize the properties of such overlayers. The procedure
                      can be employed, with some confidence, to cases for which
                      uniaxial testing is difficult or impossible.},
      cin          = {IEK-1},
      ddc          = {670},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113)},
      pid          = {G:(DE-HGF)POF3-113},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000437968900023},
      doi          = {10.1016/j.actamat.2018.05.043},
      url          = {https://juser.fz-juelich.de/record/848066},
}