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Mechanical Anisotropy in Austenitic NiMnGa Alloy: Nanoindentation Studies

Jayaraman, Ashwin and Kiran, M S R N and Ramamurty, Upadrasta (2017) Mechanical Anisotropy in Austenitic NiMnGa Alloy: Nanoindentation Studies. In: CRYSTALS, 7 (8).

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Official URL: http://doi.org/10.3390/cryst7080254


Mechanical anisotropy in an austenitic ferromagnetic shape memory alloy (SMA), Ni50Mn26.25Ga23.75, is investigated along (010), (1) over bar 20, (1) over bar 21, 23 (1) over bar and (232) using nanoindentation. While (010) exhibits the highest reduced modulus, Er, and hardness, H, (232) shows the lowest amongst the grain orientations examined in this study. The significant elastic anisotropy measured is attributed to differences in planar packing density and number of in-plane Ni-Mn and Ni-Ga bonds, whereas the plastic anisotropy is due to the differences in the onset of slip, which is rationalized by recourse to Schmid factor calculations. This would help determine the grain orientations in austenitic NiMnGa which exhibit better mechanical properties for SMA applications such as improving vibration damping characteristics of the alloy.

Item Type: Journal Article
Publication: CRYSTALS
Additional Information: Copy right for this article belongs to the MDPI AG, ST ALBAN-ANLAGE 66, CH-4052 BASEL, SWITZERLAND
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 16 Sep 2017 05:55
Last Modified: 16 Sep 2017 05:55
URI: http://eprints.iisc.ac.in/id/eprint/57830

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