About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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Heterostructured and Gradient Materials (HGM IV): Tailoring Heterogeneity for Superior Properties
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Presentation Title |
Effect of Layer Spacing and Elastic-plastic Mismatch on Fracture Toughness of Ti-TiN Multilayers |
Author(s) |
Ashwini Kumar Mishra, Hariprasad Gopalan, Marcus Hans, Christoph Kirchlechner, Jochen M. Schneider, Gerhard Dehm , Nagamani Jaya Balila |
On-Site Speaker (Planned) |
Ashwini Kumar Mishra |
Abstract Scope |
TiN is a hard protective coating that suffers from extreme brittleness. The present study explores if multilayering it with an elastically and plastically soft Ti layer can help improve its damage tolerance. Ti-TiN multilayers with different layer spacings and volume fractions are modeled using finite element simulations to derive their stress intensity factor solutions since a homogeneous assumption does not hold true. They are subsequently deposited by physical vapor deposition and their fracture behavior studied through micro-cantilever fracture tests. These values are compared to monolithic TiN. It is seen that multilayers with finer layer spacing lead to high fracture toughness. This phenomenon can be explained based on the stress distributions in individual layers. A secondary aspect of test geometry in achieving stable crack growth in multilayers is also discussed as a means of studying its R-curve behavior. |
Proceedings Inclusion? |
Planned: |