Neutron scattering studies of premartensitic phenomena [electronic resource]
Saved in:
| Online Access: |
Online Access |
|---|---|
| Corporate Author: | |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C : Oak Ridge, Tenn. :
United States. Dept. of Energy. Office of Energy Research ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
1989.
|
| Subjects: |
| Abstract: | Elastic neutron diffraction and inelastic neutron scattering are ideal techniques for studying premartensitic behavior in metallic alloys. By necessity, real, bulk samples are probed replete with their intrinsic defects. Also, because of the properties of the neutron it is straightforward to probe the behavior of the phonon modes away from the zone center which is probed in the normal ultrasonic techniques. A wide variety of alloys exhibiting martensitic transformations have been studied. It will be shown that most systems undergoing diffusionless transformations exhibit premartensitic behavior in that precursor effects are seen at temperatures well above the martensitic transformation temperature, T{sub M}. This behavior manifests itself in an anomalous temperature dependence of the energy of a particular phonon mode as the temperature approaches T{sub M}. The wavevector of this mode is frequently away from the zone center (i.e., q ≠ O). This softening is nearly always accompanied by elastic diffuse scattering at the same wavevector. Particular examples to be discussed are the alkali metals, ω-phase materials and Ni-based alloys. 34 refs., 9 figs. |
|---|---|
| Item Description: | Published through the Information Bridge: DOE Scientific and Technical Information. 01/01/1989. "bnl-43179" " conf-8907114--2" "DE90000025" International conference on martensitic phase transformations (ICOMAT-89), Sydney (Australia), 3-7 Jul 1989. Shapiro, S.M. |
| Physical Description: | Pages: (13 p) : digital, PDF file. |