% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@PHDTHESIS{Wiese:393654,
      author       = {Wiese, Bjoern},
      othercontributors = {Schmid-Fetzer, Rainer},
      title        = {{T}he effect of {C}a{O} on magnesium and magnesium calcium
                      alloys},
      school       = {Technical University Clausthal},
      type         = {Dissertation},
      reportid     = {PUBDB-2017-11597},
      pages        = {126},
      year         = {2016},
      note         = {Dissertation, Technical University Clausthal, 2016},
      abstract     = {CaO is used as a cheap replacement for Ca addition to
                      addition in Mg. CaO as an alloying element are used in the
                      ECO-Mg (Environment COnscious magnesium) alloys. The
                      CaOdissociation in Mg is reported in literature, but with
                      out a theory that can which explain the dissociation of CaO
                      in Mg alloys. The effect of Ca on the oxidation resistance
                      was known for long time and also observed from ECO-Mg.
                      However an explanation on how Ca or CaO is incorporated into
                      the oxide layer of Mg-Ca has not been clarified.This thesis
                      investigate the hypothesis that the stability of CaO and MgO
                      in the commonly used Ellingham diagram is not accurately
                      described. The in situ synchrotron radiation iffraction
                      experimental investigation of the melting and solidification
                      and thermodynamic calculation show, that the change of Gibbs
                      free energy ∆G must be considered for the en-tire Mg-Ca-O
                      system and not only the stoichiometric reactions. This
                      investigation shows that Mg reduces CaO even in solid state,
                      which is the opposite of the commonly ascribed view. The in
                      situ experiments were performed on the Mg-xCaO and
                      Mg-xCa-6CaO systems. It was possible to follower the
                      dissociation of the phases during melting and thephase
                      formation during the solidification. The experimental
                      results from the solidification sequence were used to
                      validate the thermodynamic calculations. A number of
                      different literature values of the thermodynamic data of CaO
                      and MgO were used to calculate the ternary phase diagram
                      Mg-Ca-O. Based on the thermodynamic calculations a theory
                      was developed, on how Ca is incorporated in the oxide layer.
                      The theory used the idea of a Pilling–Bedworth ratio (PBR)
                      for CaO on pure Mg (PBR > 1) and the MgO on pure Mg (PBR <
                      1). At a volume fraction of CaO higher as 0.49 in the oxide
                      layer forms with a PBR of > 1.},
      cin          = {HZG},
      cid          = {I:(DE-H253)HZG-20120731},
      pnm          = {6G3 - PETRA III (POF3-622)},
      pid          = {G:(DE-HGF)POF3-6G3},
      experiment   = {EXP:(DE-H253)P-P07-20150101},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.3204/PUBDB-2017-11597},
      url          = {https://bib-pubdb1.desy.de/record/393654},
}