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Open Access Nano Express

Martensitic transformation of FeNi nanofilm induced by interfacial stress generated in FeNi/V nanomultilayered structure

Wei Li*, Ping Liu, Ke Zhang, Fengcang Ma, Xinkuan Liu, Xiaohong Chen and Daihua He

Author Affiliations

School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

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Nanoscale Research Letters 2014, 9:440  doi:10.1186/1556-276X-9-440

Published: 27 August 2014

Abstract

FeNi/V nanomultilayered films with different V layer thicknesses were synthesized by magnetron sputtering. By adjusting the thickness of the V layer, different interfacial compressive stress were imposed on FeNi layers and the effect of interfacial stress on martensitic transformation of the FeNi film was investigated. Without insertion of V layers, the FeNi film exhibits a face-centered cubic (fcc) structure. With the thickness of V inserted layers up to 1.5 nm, under the coherent growth structure in FeNi/V nanomultilayered films, FeNi layers bear interfacial compressive stress due to the larger lattice parameter relative to V, which induces the martensitic transformation of the FeNi film. As the V layer thickness increases to 2.0 nm, V layers cannot keep the coherent growth structure with FeNi layers, leading to the disappearance of interfacial compressive stress and termination of the martensitic transformation in the FeNi film. The interfacial compressive stress-induced martensitic transformation of the FeNi nanofilm is verified through experiment. The method of imposing and modulating the interfacial stress through the epitaxial growth structure in the nanomultilayered films should be noticed and utilized.

Keywords:
FeNi alloy; Multilayer thin films; Martensitic phase transformation; Interfacial stress; Epitaxial growth