Document Type
Article
Publication Date
8-17-2007
Journal or Book Title
Physical Review B
Volume
76
Issue
5
First Page
054305
DOI
10.1103/PhysRevB.76.054305
Abstract
Ti50Pd50−xCrx is a high-temperature shape-memory alloy with a martensitic transformation temperature strongly dependent on the Cr composition. Prior to the transformation, a premartensitic phase is present with an incommensurate modulated cubic lattice with wave vector of q0=(0.22,0.22,0). The temperature dependence of the diffuse scattering in the cubic phase is measured as a function temperature for x=6.5, 8.5, and 10 at. %. The lattice dynamics has been studied and reveals anomalous temperature andq dependences of the [110]-TA2 transverse phonon branch. The phonon linewidth is broad over the entire Brillouin zone and increases with decreasing temperature, contrary to the behavior expected for anharmonicity. No anomaly is observed at q0. The results are compared with first principles calculation of the phonon structure.
Copyright Owner
American Physical Society
Copyright Date
2008
Language
en
File Format
application/pdf
Recommended Citation
Shapiro, S. M.; Xu, Guangyong; Schlagel, Deborah L.; Lograsso, Thomas A.; and Erwin, R., "Anomalous phonon behavior in the high-temperature shape-memory alloy Ti50Pd50−xCrx" (2007). Ames Laboratory Publications. 78.
https://lib.dr.iastate.edu/ameslab_pubs/78
Comments
This article is from Physical Review B 76 (2007): 054305, doi:10.1103/PhysRevB.76.054305.