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001047160 1001_ $$0P:(DE-HGF)0$$aZhang, Yinxia$$b0
001047160 245__ $$aColumnar grain boundaries are the weakest link in hard coatings: insights from micro-cantilever testing
001047160 260__ $$aLondon [u.a.]$$bTaylor & Francis$$c2025
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001047160 520__ $$aThe 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.
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001047160 7001_ $$0P:(DE-HGF)0$$aBartosik, Matthias$$b1
001047160 7001_ $$0P:(DE-Juel1)164854$$aBrinckmann, Steffen$$b2$$ufzj
001047160 7001_ $$0P:(DE-HGF)0$$aBansal, Ujjval$$b3
001047160 7001_ $$0P:(DE-HGF)0$$aLee, Subin$$b4$$eCorresponding author
001047160 7001_ $$0P:(DE-HGF)0$$aKirchlechner, Christoph$$b5
001047160 773__ $$0PERI:(DE-600)2703730-7$$a10.1080/21663831.2025.2560526$$gp. 1 - 9$$n11$$p1099-1107$$tMaterials Research Letters$$v13$$x2166-3831$$y2025
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