A new approach predicting the evolution of laminated nanostructures - Martensite in NiTi as an example

Author(s)
Manuel Petersmann, Thomas Antretter, T. Waitz, F. D. Fischer
Abstract

A model for laminated nanostructures, combining classical energy minimization with full-field finite element calculations in a computationally fully automated manner, is set up and used to quantitatively analyse the interaction of grains via self-accommodation of their transformation strains. The well known Koistinenwell established B2-B19' martensitic phase transformation in nanocrystalline NiTi is treated as an exemplary case to demonstrate our new framework. A systematic search for an optimal energy minimizing transformation path is employed within a full-field model, including crystallographic transformation strains and fully anisotropic elastic constants, by using the Python scripting language. The microstructure is updated based on previous calculation results. The underlying incremental free energy minimization criterion naturally reproduces the transformation kinetics. The sequence of grains subjected to transformation as well as the selection of martensitic variants within the grains are obtained yielding the evolution of the total interface energy as well as the strain energy, dominating our approach.

Organisation(s)
Physics of Nanostructured Materials
External organisation(s)
Montanuniversit├Ąt Leoben
Journal
Modelling and Simulation in Materials Science and Engineering
Volume
25
No. of pages
17
ISSN
0965-0393
DOI
https://doi.org/10.1088/1361-651X/aa5ab4
Publication date
02-2017
Peer reviewed
Yes
Austrian Fields of Science 2012
103018 Materials physics, 103035 Theoretical mechanics
Keywords
ASJC Scopus subject areas
Modelling and Simulation, Materials Science(all), Condensed Matter Physics, Mechanics of Materials, Computer Science Applications
Portal url
https://ucris.univie.ac.at/portal/en/publications/a-new-approach-predicting-the-evolution-of-laminated-nanostructures--martensite-in-niti-as-an-example(94227001-176f-43d8-be3c-933b2f53ca39).html