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@ARTICLE{Kmmel:480795,
      author       = {Kümmel, Frank and Fritton, Massimo and Solís, Cecilia and
                      Kriele, Armin and Stark, Andreas and Gilles, Ralph},
      title        = {{N}ear-{S}urface and {B}ulk {D}issolution {B}ehavior of
                      $γ′$ {P}recipitates in {N}ickel-{B}ased {VDM}$^®$
                      {A}lloy 780 {S}tudied with {I}n-{S}itu {L}ab-{S}ource and
                      {S}ynchrotron {X}-ray {D}iffraction},
      journal      = {Metals},
      volume       = {12},
      number       = {7},
      issn         = {2075-4701},
      address      = {Basel},
      publisher    = {MDPI},
      reportid     = {PUBDB-2022-03968},
      pages        = {1067},
      year         = {2022},
      abstract     = {The dissolution of nano-sized Ni3Al-based $γ′$
                      precipitates was investigated in the newly developed
                      polycrystalline nickel-based VDM$^®$ Alloy 780 at the
                      surface and in the bulk region with in-situ lab-source and
                      synchrotron X-ray diffraction. These studies are important
                      in obtaining a deeper understanding of the strengthening
                      mechanism responsible for the stability and long service
                      lives of such superalloys. We found that the dissolution
                      behavior of the $γ′$ phase is very similar at the surface
                      and in the bulk region, but small deviations were detected.
                      The dissolution of $γ′$ starts at around 800 °C and no
                      $γ′$ was found at temperatures exceeding 970 °C. As a
                      result, the elements Al and Nb, which were bound in the
                      $γ′$ phase, dissolved into the $γ$ matrix and strongly
                      increased the $γ$ lattice parameter, as their atomic size
                      is larger than the $γ$-forming elements Ni, Co, and Cr.
                      However, this effect was suppressed in the surface area. A
                      second matrix $γ$ phase was detected at the same
                      temperature range as that of the dissolution of the $γ′$
                      phase in the lab-source XRD measurements. The newly formed
                      $γ$-2 phase had a smaller lattice parameter than that of
                      the initial $γ$ matrix. We propose that the $γ$-2 matrix
                      phase is a result of high-temperature surface oxidation,
                      which consumes, among other elements, Al and Nb and,
                      therefore, leads to the smaller $γ$ lattice parameter.},
      cin          = {DOOR ; HAS-User / TUM / Hereon},
      ddc          = {530},
      cid          = {I:(DE-H253)HAS-User-20120731 / I:(DE-588b)36241-4 /
                      I:(DE-H253)Hereon-20210428},
      pnm          = {6G3 - PETRA III (DESY) (POF4-6G3)},
      pid          = {G:(DE-HGF)POF4-6G3},
      experiment   = {EXP:(DE-H253)P-P07-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000834415900001},
      doi          = {10.3390/met12071067},
      url          = {https://bib-pubdb1.desy.de/record/480795},
}