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@ARTICLE{Zhang:1047160,
      author       = {Zhang, Yinxia and Bartosik, Matthias and Brinckmann,
                      Steffen and Bansal, Ujjval and Lee, Subin and Kirchlechner,
                      Christoph},
      title        = {{C}olumnar grain boundaries are the weakest link in hard
                      coatings: insights from micro-cantilever testing},
      journal      = {Materials Research Letters},
      volume       = {13},
      number       = {11},
      issn         = {2166-3831},
      address      = {London [u.a.]},
      publisher    = {Taylor $\&$ Francis},
      reportid     = {FZJ-2025-04117},
      pages        = {1099-1107},
      year         = {2025},
      abstract     = {The effect of columnar grain boundaries (GBs) on the
                      fracture toughness was investigated using micro-cantilever
                      fracture testing in a hard coating featuring two distinct
                      microstructures within a single sample: a columnar-grained
                      top and an epitaxial bottom region. Bridge-notch fracture
                      initiated more readily in the columnar-grained region,
                      indicating reduced toughness. Furthermore, quantitative
                      analysis of the load drops at bridge-failure confirmed a
                      $∼30\%$ decrease in fracture toughness due to GBs: from
                      4.1 to 3.0 MPa m1/2. These results reveal the detrimental
                      role of GBs in fracture toughness and highlight the
                      importance of microstructural design for improving the
                      mechanical performance of hard coatings.},
      cin          = {IMD-1},
      ddc          = {670},
      cid          = {I:(DE-Juel1)IMD-1-20101013},
      pnm          = {1241 - Gas turbines (POF4-124)},
      pid          = {G:(DE-HGF)POF4-1241},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1080/21663831.2025.2560526},
      url          = {https://juser.fz-juelich.de/record/1047160},
}