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Crystals 2017, 7(8), 254;

Mechanical Anisotropy in Austenitic NiMnGa Alloy: Nanoindentation Studies

Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
Harvard John A. Paulson School of Engineering and Applied Sciences, Cambridge, MA 02138, USA
SRM Research Institute and Department of Physics and Nanotechnology, SRM University, Kattankulathur, Chennai 603203, India
Author to whom correspondence should be addressed.
Academic Editor: Ronald W. Armstrong
Received: 23 June 2017 / Revised: 14 August 2017 / Accepted: 15 August 2017 / Published: 17 August 2017
(This article belongs to the Special Issue Crystal Indentation Hardness)
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Abstract: Mechanical anisotropy in an austenitic ferromagnetic shape memory alloy (SMA), Ni50Mn26.25Ga23.75, is investigated along (010), (120), (121), (231) 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. View Full-Text
Keywords: NiMnGa; mechanical anisotropy; nanoindentation; hardness; modulus NiMnGa; mechanical anisotropy; nanoindentation; hardness; modulus

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Jayaraman, A.; Kiran, M.S.R.N.; Ramamurty, U. Mechanical Anisotropy in Austenitic NiMnGa Alloy: Nanoindentation Studies. Crystals 2017, 7, 254.

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