PSI - Issue 28

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2020) 000–000

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ScienceDirect

Procedia Structural Integrity 28 (2020) 1644–1649

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Abstract Nanocrystalline metals have attracted a considerable attention over the past two decades due to their increased tensile strength. The difficulty in producing large quantities of nanocrystalline materials has imposed the use of characterization methods involving small volume samples such as the nanoindentation method. In the present work, the nanoindentation behavior of Tungsten – Copper nanocrystalline alloys was characterized by tests conducted according to ISO 14577 standard and simulated using a finite element model developed in the Abaqus FE code. Tungsten - Copper alloys of coarse-grained and nanocrystalline microstructures were tested and modeled. Using the model, the effects of sharpness of the Berkovich indenter was studied. The experimental results show a superiority of the nanocrystalline material, which is explained by the Hall-Petch effect. Between the model and the tests a good convergence is achieved. The convergence is better for the rounded tip of the indenter. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Keywords: Nano-crystalline materials; Finite Element Analysis; Nanoindentation tests 1. Introduction Materials with nano-scale microstructure (nanocrystalline materials) are becoming increasingly popular due to their high yield strength (Pachla et al., 2017). The enhancement in strength by decreasing grain size is described by the Hall–Petch equation (Petch, 1987). Despite the significant progress in manufacturing of nanocrystalline materials, 1st Virtual European Conference on Fracture Nanoindentation testing and simulation of nanocrystalline materials Konstantinos Tserpes a *, Panagiotis Bazios a , Spiros Pantelakis a and Nikolaos Michailidis b a Laboratory of Technology and Strength of Materials, Department of Mechanical Engineering and Aeronautics, University of Patras, 26500 Rion, Greece b Physical Metallurgy Laboratory, Mechanical Engineering Department, School of Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece

* Corresponding author. Tel.: +30-2610-969439; fax: +30-2610-969439. E-mail address: kitserpes@upatras.gr

2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.10.136