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arXiv · 1005.4873

Correlation between Local Structure Distortions and Martensitic Transformation in Ni-Mn-In alloys

D. N. Lobo·K. R. Priolkar·P. A. Bhobe·D. Krishnamurthy·S. Emura
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Abstract

The local structural distortions arising as a consequence of increasing Mn content in Ni_2Mn_1+xIn_1-x (x=0, 0.3, 0.4, 0.5 and 0.6) and its effect on martensitic transformation have been studied using Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy. Using the room temperature EXAFS at the Ni and Mn K-edges in the above compositions, the changes associated with respect to the local structure of these absorbing atoms are compared. It is seen that in the alloys exhibiting martensitic transformation ($x \ge 0.4$) there is a significant difference between the Ni-In and Ni-Mn bond lengths even in the austenitic phase indicating atomic volume to be the main factor in inducing martensitic transformation in Ni-Mn-In Heusler alloys.

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D. N. Lobo, K. R. Priolkar, P. A. Bhobe, D. Krishnamurthy, S. Emura. 2010-05-26. Correlation between Local Structure Distortions and Martensitic Transformation in Ni-Mn-In alloys. https://doi.org/10.1063/1.3454277

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