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Abstract:
This work focuses on the anisotropic deformation and fracture mechanisms of a typical physical vapor deposited TiN/ZrN multilayer, employing novel nanoindentation and micropillar compression techniques. The results highlight a stronger nanoindentation response of the multilayer when loaded perpendicular (90 degrees) to the layer orientation, and the deformation was mainly controlled by the plasticity of ZrN layers. In comparison, at parallel (0 degrees) orientation, the kink banding and the induced cracking may weaken the constraint beneath the indenter, thus leading to degraded hardness. By considering the anisotropic deformation mechanisms, nanoindentation finite element modeling was further performed to give reliable predictions on the strength at the inclined orientation. The modeling results suggest a dominant deformation mechanism that occurred mainly in the ZrN layers, with minor contribution from the stiff TiN layers. As a result, a minimized hardness was predicted at 45 degrees loading direction with respect to layer orientation. Finally, the micropillar compressions show a brittle nature of both 90 degrees and 0 degrees oriented micropillars, and a higher fracture strain was obtained at 90 degrees, due to the observed crack termination mechanism at this orientation.
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CERAMICS INTERNATIONAL
ISSN: 0272-8842
Year: 2020
Issue: 10
Volume: 46
Page: 15502-15509
4 . 5 2 7
JCR@2020
4 . 5 2 7
JCR@2020
ESI Discipline: MATERIALS SCIENCE;
ESI HC Threshold:84
JCR Journal Grade:2
CAS Journal Grade:1
Cited Count:
WoS CC Cited Count: 7
SCOPUS Cited Count: 13
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 1
Affiliated Colleges: