Autor: |
Jakob Schwiedrzik, Rajaprakash Ramachandramoorthy, Thomas E.J. Edwards, Patrik Schürch, Daniele Casari, Maria J. Duarte, Gaurav Mohanty, Gerhard Dehm, Xavier Maeder, Laetitia Philippe, Jean-Marc Breguet, Johann Michler |
Jazyk: |
angličtina |
Rok vydání: |
2022 |
Předmět: |
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Zdroj: |
Materials & Design, Vol 220, Iss , Pp 110836- (2022) |
Druh dokumentu: |
article |
ISSN: |
0264-1275 |
DOI: |
10.1016/j.matdes.2022.110836 |
Popis: |
Template-assisted electrodeposition is a promising microscale additive manufacturing technique allowing to deposit pure metals with high resolution. To allow the application-relevant design of metamaterials, it is necessary to establish microstructure-mechanical property relationships under extreme conditions. In this work, a novel process based on two-photon lithography was used to synthesize arrays of nanocrystalline nickel micropillars and complex microlattices. This allowed high throughput mechanical testing using a newly developed in situ nanoindenter at unprecedented combination of cryogenic temperatures (160 to 300 K) and strain rates (0.001 to 500 s−1). Strain rate sensitivity was found to increase from ∼ 0.004 at 300 K to ∼ 0.008 at 160 K. Thermal activation analysis showed a decrease in activation volume from 122b3 at 300 K to 45b3 at 160 K and an activation energy of 0.59 eV in line with collective dislocation nucleation as the rate limiting mechanism. Transmission Kikuchi Diffraction allowed quantifying microstructural changes during deformation. As such, a deformation map along with the responsible deformation mechanisms has been ascertained for additively micromanufactured nanocrystalline nickel at unique combinations of extreme temperatures and strain rates. Further, rate-dependent compression of microlattices and complementary finite element simulations using the results from micropillars as constitutive models exemplified the promise of such metal microarchitectures in space and aviation applications. |
Databáze: |
Directory of Open Access Journals |
Externí odkaz: |
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