Quantitative Landau potentials for the martensitic transformation in Ni-Al

Salje, E. K. H. and Zhang, H. L. and Schryvers, D. and Bartova, B. (2007) Quantitative Landau potentials for the martensitic transformation in Ni-Al. Applied Physics Letters, 90 (22). p. 221903. ISSN 0003-6951 DOI 10.1063/1.2743927

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Abstract

The martensitic phase transformation in Ni–Al (63.5 at. % Ni) is described by a Landau-type Gibbs free energy G(Q)=1/2AThetas(coth(Thetas/T)−coth(Thetas/TC))Q2+1/4BQ4+1/6CQ6, with A=5.6 J K−1 mol−1, B=−3493 J mol−1, C=4901 J mol−1, TC=86 K, and Thetas=257 K. The dispersion (Ginzburg) energy was estimated to be g=60 J mol−1 nm2. This potential was determined from high resolution diffraction data to determine the spontaneous strain as proxy for the order parameter Q and differential scanning calorimetry measurements for the calibration of the excess entropy of the martensitic phase transformation. The Gibbs free energy is compared with equivalent functions of Ni–Ti, quartz, KMnF3, BaTiO3, and SrTiO3.

Item Type: Article
Uncontrolled Keywords: 2007 AREP IA54 2007 P
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Applied Physics Letters
Volume: 90
Page Range: p. 221903
Identification Number: 10.1063/1.2743927
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:03
Last Modified: 23 Jul 2013 10:08
URI: http://eprints.esc.cam.ac.uk/id/eprint/649

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