Hauptseite > Publikationsdatenbank > Columnar grain boundaries are the weakest link in hard coatings: insights from micro-cantilever testing > print

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082 _ _ |a 670
100 1 _ |a Zhang, Yinxia
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245 _ _ |a Columnar grain boundaries are the weakest link in hard coatings: insights from micro-cantilever testing
260 _ _ |a London [u.a.]
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520 _ _ |a 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.
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700 1 _ |a Bartosik, Matthias
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700 1 _ |a Brinckmann, Steffen
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700 1 _ |a Bansal, Ujjval
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700 1 _ |a Lee, Subin
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700 1 _ |a Kirchlechner, Christoph
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773 _ _ |a 10.1080/21663831.2025.2560526
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