Achieving ultra-large elastic strains in Nb thin films on NiTi phase-transforming substrate by the principle of lattice strain matching

Fakhrodin Motazedian; Junsong Zhang; Zhigang Wu; Daqiang Jiang; Satyajit Sarkar; Mariusz Martyniuk; Cheng Yan; Yinong Liu; Hong Yang

Materials & Design (Jan 2021)

Achieving ultra-large elastic strains in Nb thin films on NiTi phase-transforming substrate by the principle of lattice strain matching

Fakhrodin Motazedian,
Junsong Zhang,
Zhigang Wu,
Daqiang Jiang,
Satyajit Sarkar,
Mariusz Martyniuk,
Cheng Yan,
Yinong Liu,
Hong Yang

Affiliations

Fakhrodin Motazedian: Department of Mechanical Engineering, The University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia
Junsong Zhang: Department of Mechanical Engineering, The University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia
Zhigang Wu: School of Civil Engineering, Guangzhou University, Guangzhou 510006, China
Daqiang Jiang: Department of Materials Science and Engineering, China University of Petroleum-Beijing, Changping, Beijing 102249, China
Satyajit Sarkar: Department of Mechanical Engineering, The University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia
Mariusz Martyniuk: Department of Electrical, Electronic and Computer Engineering, The University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia
Cheng Yan: School of Mechanical, Medical and Process Engineering, Science and Engineering Faculty, Queensland University of Technology, Brisbane, QLD 4001, Australia
Yinong Liu: Department of Mechanical Engineering, The University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia
Hong Yang: Department of Mechanical Engineering, The University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia; Corresponding author.

Journal volume & issue: Vol. 197
p. 109257

Abstract

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Two-dimensional nanomaterials are able to sustain ultra-large elastic strains, which in turn hold potential to alter the many functional properties. However, to achieve such large elastic strains in macro-forms suitable for applications has been a challenge. This paper reports an innovative approach to overcome this challenge by using a martensitic transforming substrate to induce ultra-large elastic lattice strains in metallic thin films deposited on it, as demonstrated in a Nb film-on-NiTi substrate system. This design is based on a novel concept of “lattice strain matching” between the uniform elastic lattice strain of the Nb film and the uniform crystallographic lattice strain of the martensitic transformation of the NiTi substrate. By this principle, the Nb film was able to exhibit reversible elastic lattice strains between −3.66% in compression and+3.74% in tension, for a total elastic strain span of +7.40% (the maximum in one loading deformation) by mechanical deformation of the substrate. These elastic lattice strains are 10–20 times of what are possible for bulk Nb or metallic thin films on conventional substrates. The findings of this work offer a unique opportunity to use ultra-large elastic strains as a means to engineer and improve functional properties of thin film materials.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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