Martensitic transformation of a Ni-Al alloy. II. Theoretical treatments
- 1 December 1990
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 42 (16), 10405-10414
- https://doi.org/10.1103/physrevb.42.10405
Abstract
The seven-layered martensite structure of the Ni-Al alloy reported in the preceding paper is investigated on a theoretical basis. We have developed a treatment of the martensite phase transformation within a site-independent scheme describing atomic fluctuations in a highly anharmonic lattice. From a microscopic viewpoint a pseudospin variable is introduced which stands for the amplitude of the local vibrational mode called the embryonic mode, and the martensite transformation is discussed as the ordering process of the pseudospins. Through a coarse-graining procedure, a semimacroscopic view has also been developed within the Ginzburg-Landau formalism. The results have been applied to analyze the observed neutron-diffraction spectra. In particular, the anomalous incommensurability of the spectra is understood by considering that the order parameter takes on two different values alternatively in space, which is interpreted in terms of the theoretically predicted ‘‘crest-riding-periodon’’ phase.Keywords
This publication has 21 references indexed in Scilit:
- Martensitic transformation of a Ni-Al alloy. I. Experimental results and approximate structure of the seven-layered phasePhysical Review B, 1990
- Neutron Scattering Studies of Premartensitic PhenomenaMaterials Science Forum, 1990
- Structure Analysis of NiAl MartensiteMaterials Science Forum, 1990
- An Embryo-Phonon Coupling Model for Martensitic Phase Transformation in BCC-AlloysMaterials Science Forum, 1990
- Pseudospin-phonon coupling model for martensitic transformation in bcc-based alloysPhysical Review B, 1989
- Atomistic Study of Anomalous Self-Diffusion in bcc-TitaniumPhysical Review Letters, 1988
- Neutron scattering study of premartensitic behavior in Ni-Al alloysPhysical Review Letters, 1986
- A neutron scattering study of Au23Cu30Zn47above its martensitic transformationJournal of Physics F: Metal Physics, 1984
- Anomalous Inelastic Neutron Scattering in bcc Zr-Nb AlloysPhysical Review Letters, 1975
- Soft phonon mode at the martensitic phase transformation of AuCuZn2Solid State Communications, 1975