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HomeMaterials Science ForumMaterials Science Forum Vol. 856Constitutive Modeling of Near-Equiatomic NiTi...

Constitutive Modeling of Near-Equiatomic NiTi Shape Memory Alloys Considering Composition and Heat Treatment

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Abstract:

A predictive microscale-informed model that takes into account the precipitate–shape memory performance relations and allows for the evaluation of the effective thermomechanical response of precipitated Ni-rich NiTi shape memory alloys on the basis of composition and heat treatment is presented. The model considers the structural effect of the precipitates (coherency stresses due to the lattice mismatch between the precipitates and the matrix material and precipitate volume fraction), as well as the effect of the Ni-concentration gradient in the matrix, resulting from Ni-depletion during precipitate growth. The predictive capability of the model is tested against experimental data obtained fromNi₅₀.₇Ti (at. %) that has been heat treated under different conditions and good agreement is shown.

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Periodical:

Materials Science Forum (Volume 856)

Pages:

78-84

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.856.78

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Online since:

May 2016

Authors:

Austin Cox, Theocharis Baxevanis*, Dimitris C. Lagoudas

Keywords:

Finite Elements, Micromechanics, Ni-Depletion, Ni-Rich NiTi, Representative Volume Element, Shape Memory Alloys

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© 2016 Trans Tech Publications Ltd. All Rights Reserved

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