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@ARTICLE{Wu:620142,
      author       = {Wu, Chengguang and Aota, Leonardo Shoji and Rao, Jing and
                      Zhang, Xukai and Perrière, Loïc and Duarte, Maria Jazmin
                      and Raabe, Dierk and Ma, Yan},
      title        = {{H}ydrogen-assisted spinodal decomposition in a
                      {T}i{N}b{Z}r{H}f{T}a complex concentrated alloy},
      journal      = {Acta materialia},
      volume       = {285},
      issn         = {1359-6454},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {PUBDB-2025-00059},
      pages        = {120707},
      year         = {2025},
      abstract     = {Understanding hydrogen-metal interactions is critical for
                      developing refractory complex concentrated alloys (CCAs),
                      applicable to the hydrogen economy. In this study, we
                      revealed a hydrogen-assisted spinodal decomposition
                      phenomenon at the nanoscale in an equiatomic TiNbZrHfTa CCA
                      upon its exposure to H$_2$ at 500 °C. Such a decomposition
                      pathway was characterized by a periodic compositional
                      modulation with an up-hill diffusion behavior of the
                      principal metallic elements, particularly Zr, over an
                      extended treatment period (from 0.5 h to 2 h) in an H$_2$
                      atmosphere, probed by three-dimensional atom probe
                      tomography. Consequently, the decomposed alloy consisted of
                      a needle-shaped phase enriched in Zr and Ti and a phase
                      enriched in Nb and Ta. Crystallographically, the spinodal
                      features aligned preferentially along 〈001〉 directions
                      of the matrix phase to minimize elastic strain energy. To
                      better understand the role of hydrogen in spinodal
                      decomposition, a statistical thermodynamic model was further
                      developed by incorporating hydrogen to predict the phase
                      stability of the TiNbZrHfTa-H system. This analysis
                      suggested that hydrogen destabilizes the single
                      solid-solution phase by expanding the spinodal region. Such
                      nanoscale spinodal decomposition enhanced the hardness and
                      anti-abrasive properties of the investigated alloy. Thus,
                      this study not only provides fundamental insights into the
                      effect of hydrogen on phase stability, but also demonstrates
                      a novel alloy design strategy by introducing hydrogen as an
                      interstitial alloying element to tailor the microstructure.},
      cin          = {FS DOOR-User},
      ddc          = {670},
      cid          = {$I:(DE-H253)FS_DOOR-User-20241023$},
      pnm          = {6G3 - PETRA III (DESY) (POF4-6G3) / DFG project
                      G:(GEPRIS)388544551 - Design und mechanische Eigenschaften
                      chemisch-komplexer Legierungen: von Zwillings-induzierter
                      Plastizität zu bidirektionaler transformations-induzierter
                      Plastizität (MULTI-TRIP CCAs) (388544551) / FS-Proposal:
                      I-20230183 (I-20230183) / FS-Proposal: I-20231121
                      (I-20231121)},
      pid          = {G:(DE-HGF)POF4-6G3 / G:(GEPRIS)388544551 /
                      G:(DE-H253)I-20230183 / G:(DE-H253)I-20231121},
      experiment   = {EXP:(DE-H253)P-P02.1-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001407775900001},
      doi          = {10.1016/j.actamat.2024.120707},
      url          = {https://bib-pubdb1.desy.de/record/620142},
}