The martensitic transformation in In-Tl alloys revisited.
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Date
2019-02-05
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Australian Institute of Physics
Abstract
The traditional view for the martensitic transformation in In-xat%Tl alloys, for 15.5 ≤ 𝑥 ≤ 30.5 was via a double shear such as: (101) [101]; (011) [011], on the basis of optical microscopy observations and measurements of the (𝑐11 - 𝑐12)/2 elastic constant. However, this model was called into question following recent low-ζ measurements of the [ζζ0][ζζ0] phonons. An alternative model for the formation of coherent nuclei and growth along conjugate {111} planes was once proposed by Geisler. This model is consistent with some electron diffuse scattering data as well as yielding identical x-ray pole figure results as those for the double-shear mechanism. Appropriate nuclei could be generated by 〈111〉 〈112〉 atomic displacements. To test such an idea we have measured the [ζζζ]T phonon branch for a good quality In-Tl crystal in a recent experiment using the cold-triple axis facility, SIKA, at the OPAL Research Reactor. These results will be reported and compared with the predictions of a model for the dynamical behaviour of coherent interfaces and modulated structures based on topological solitons, first introduced by Barsch and Krumhansl and applied to the twins accompanying martensitic transformations.
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Keywords
Alloys, Australia, OPAL Reactor, Coherent scattering, Diffraction, Scattering, Iron alloys, Iron base alloys, Martensitic steels
Citation
Finlayson, T. R., McIntyre, G. J., Rule, K. C., & Saxena, A. (2019). The martensitic transformation in In-Tl alloys revisited. Poster presented to the 43rd Annual Condensed Matter and Materials Meeting, Charles Sturt University, Wagga Wagga, NSW, 5th February - 8th February, 2019, (pp. 67). Retrieved from: https://physics.org.au/wp-content/uploads/cmm/2019/Wagga_2019_Conference_Handbook.pdf