Interface mediated deformation and fracture of an elastic–plastic bimaterial system resolved by in situ transmission scanning electron microscopy

Markus Alfreider, Glenn Balbus, Fulin Wang, Johannes Zechner, Daniel S. Gianola, Daniel Kiener

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

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Abstract

A wide variety of today’s engineering material systems consist of multiple layered constituents to satisfy varying demands, e.g. thermal barrier- or hard coatings, thermal- or electrical conduction or insulation layers, or diffusion barriers. However, these layers are commonly only of the order of a few hundred nanometers to microns thick, which renders conventional mechanical investigation of interfacial failure quite challenging, especially if plastically deforming constituents are involved. Herein, we present an in situ study of the mechanical deformation of a WTi-Cu model interface, commonly encountered in the microelectronics industry, utilizing transmission scanning electron microscopy. This approach elucidated the interplay between plastic deformation and fracture processes when loading either perpendicular (mode I) or parallel to the interface (mode II). Under mode I purely ductile failure in the Cu phase, exhibiting dislocation slip facilitated void nucleation and coalescence, was observed with an initiation value for dislocation propagation of Jdislocation≈15 J/m2. Mode II loading exhibited nucleation and propagation of an interface crack, with the initiation value for crack extension as Jcrack≈8.8 J/m2. The results are discussed with respect to the frameworks of classical fracture mechanics and dislocation plasticity, providing fundamental insight into the failure behaviour of elastic–plastic interfaces with respect to loading orientation.
OriginalspracheEnglisch
Aufsatznummer111136
Seitenumfang17
FachzeitschriftMaterials and Design
Jahrgang223.2022
AusgabenummerNovember
DOIs
PublikationsstatusElektronische Veröffentlichung vor Drucklegung. - 14 Sept. 2022

Bibliographische Notiz

Funding Information:
This study was conducted during a research stay at UCSB financed by an Austrian Marshall Plan Scholarship, which is gratefully acknowledged. Further financial support under the scope of the COMET program within the K2 Center “Integrated Computational Material, Process and Product Engineering, IC-MPPE” (Project 859480, A2.12) is also acknowledged. This program is supported by the Austrian Federal Ministries for Transport, Innovation and Technology (BMVIT) and for Digital and Economic Affairs (BMDW), represented by the Österreichische Forschungsförderungsgesellschaft (Funder ID: 10.13039/501100004955), and the federal states of Styria, Upper Austria, and Tyrol. This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant No. 771146 TOUGHIT). The authors also acknowledge partial support from the NSF MRSEC Program through DMR 1720256 (IRG-1). The research reported here made use of shared facilities of the UCSB MRSEC (NSF DMR 1720256), a member of the Materials Research Facilities Network (www.mrfn.org). GHB acknowledges support from the National Science Foundation Graduate Research Fellowship under Grant No. 1650114. The authors would also like to thank Aidan Taylor, Eric Yao, Jungho (Paul) Shin and Jean-Charles (JC) Stinvillle for support with the experimental setup as well as fruitful discussions. The raw/processed data required to reproduce these findings are available from the corresponding author upon reasonable request.

Funding Information:
This study was conducted during a research stay at UCSB financed by an Austrian Marshall Plan Scholarship, which is gratefully acknowledged. Further financial support under the scope of the COMET program within the K2 Center “Integrated Computational Material, Process and Product Engineering, IC-MPPE” (Project 859480, A2.12) is also acknowledged. This program is supported by the Austrian Federal Ministries for Transport, Innovation and Technology (BMVIT) and for Digital and Economic Affairs (BMDW), represented by the Österreichische Forschungsförderungsgesellschaft (Funder ID: 10.13039/501100004955), and the federal states of Styria, Upper Austria, and Tyrol. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant No. 771146 TOUGHIT). The authors also acknowledge partial support from the NSF MRSEC Program through DMR 1720256 (IRG-1). The research reported here made use of shared facilities of the UCSB MRSEC (NSF DMR 1720256), a member of the Materials Research Facilities Network (www.mrfn.org). GHB acknowledges support from the National Science Foundation Graduate Research Fellowship under Grant No. 1650114. The authors would also like to thank Aidan Taylor, Eric Yao, Jungho (Paul) Shin and Jean-Charles (JC) Stinvillle for support with the experimental setup as well as fruitful discussions.

Publisher Copyright:
© 2022 The Authors

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