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@ARTICLE{Li:1045980,
      author       = {Li, Xi and Peter, Nicolas J. and Moreira de Lima, Marilaine
                      and Matthes, Sebastian and Schaaf, Peter and Schwaiger,
                      Ruth},
      title        = {{S}trengthening {M}echanism of {A}l/{N}i {M}ultilayers with
                      {N}egative {E}nthalpy of {M}ixing},
      journal      = {Nano letters},
      volume       = {25},
      number       = {34},
      issn         = {1530-6984},
      address      = {Washington, DC},
      publisher    = {ACS Publ.},
      reportid     = {FZJ-2025-03639},
      pages        = {12914 - 12920},
      year         = {2025},
      abstract     = {The interface strengthening effect in nanoscale metallic
                      multilayers is influenced by the enthalpy of mixing, which
                      governs the chemical distribution and interface
                      microstructure. In this study, Al/Ni multilayers were
                      fabricated by magnetron sputter deposition, exhibiting an
                      ultrahigh peak hardness of 9.5 GPa─the highest reported
                      for face-centered cubic multilayer systems. Advanced
                      electron microscopy revealed extensive interdiffusion at the
                      Al/Ni interfaces and the formation of intermetallic bonds at
                      both interfaces and grain boundaries. A modified confined
                      layer slip model is proposed, accounting for energy changes
                      associated with trailing dislocations propagating through
                      interfaces or grain boundaries due to intermetallic bond
                      formation. The model aligns closely with experimental data,
                      demonstrating that intermetallic bond formation in Al/Ni
                      multilayers significantly enhances interface strengthening,
                      counteracting the weakening effects of interface diffusion.
                      This mechanism may also account for the high peak hardness
                      observed in other multilayer systems with large negative
                      enthalpies of mixing.},
      cin          = {IMD-1},
      ddc          = {660},
      cid          = {I:(DE-Juel1)IMD-1-20101013},
      pnm          = {1241 - Gas turbines (POF4-124) / DFG project
                      G:(GEPRIS)426206394 - Thermomechanische Spannungs- und
                      Verformungseffekte in reaktiven Al/Ni-Multilagen für das
                      Entbonden (426206394)},
      pid          = {G:(DE-HGF)POF4-1241 / G:(GEPRIS)426206394},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1021/acs.nanolett.5c02939},
      url          = {https://juser.fz-juelich.de/record/1045980},
}