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Title: Nanoscale mechanical surface properties of single crystalline martensitic Ni-Mn-Ga ferromagnetic shape memory alloys
Authors: Jakob, A.M.Müller, M.Rauschenbach, B.Mayr, S.G.
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Issue Date: 2012
Published in: New Journal of Physics Vol. 14 (2012)
Publisher: Bristol : IOP
Abstract: Located beyond the resolution limit of nanoindentation, contact resonance atomic force microscopy (CR-AFM) is employed for nano-mechanical surface characterization of single crystalline 14M modulated martensitic Ni-Mn-Ga (NMG) thin films grown by magnetron sputter deposition on (001) MgO substrates. Comparing experimental indentation moduli-obtained with CR-AFM-with theoretical predictions based on density functional theory (DFT) indicates the central role of pseudo plasticity and inter-martensitic phase transitions. Spatially highly resolved mechanical imaging enables the visualization of twin boundaries and allows for the assessment of their impact on mechanical behavior at the nanoscale. The CR-AFM technique is also briefly reviewed. Its advantages and drawbacks are carefully addressed.
Keywords: Contact resonance; Density functional theories (DFT); Ferromagnetic shape memory alloy; Magnetron sputter deposition; Mechanical behavior; Mechanical imaging; Mechanical surface; MgO substrate; Nano scale; Ni-Mn-Ga; Pseudoplasticity; Resolution limits; Single-crystalline; Surface characterization; Theoretical prediction; Twin boundaries; Atomic force microscopy; Crystalline materials; Gallium; Gallium alloys; Manganese; Nanoindentation; Nanotechnology; Surface properties; Visualization; Mechanical properties
DDC: 530
License: CC BY-NC-SA 3.0 Unported
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Appears in Collections:Physik

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