Crystal defect studies using x-ray diffuse scattering
Microscopic lattice defects such as point (single atom) defects, dislocation loops, and solute precipitates are characterized by local electronic density changes at the defect sites and by distortions of the lattice structure surrounding the defects. The effect of these interruptions of the crystal lattice on the scattering of x-rays is considered in this paper, and examples are presented of the use of the diffuse scattering to study the defects. X-ray studies of self-interstitials in electron irradiated aluminum and copper are discussed in terms of the identification of the interstitial configuration. Methods for detecting the onset of point defect aggregation into dislocation loops are considered and new techniques for the determination of separate size distributions for vacancy loops and interstitial loops are presented. Direct comparisons of dislocation loop measurements by x-rays with existing electron microscopy studies of dislocation loops indicate agreement for larger size loops, but x-ray measurements report higher concentrations in the smaller loop range. Methods for distinguishing between loops and three-dimensional precipitates are discussed and possibilities for detailed studies considered. A comparison of dislocation loop size distributions obtained from integral diffuse scattering measurements with those from TEM show a discrepancy in the smaller sizes similar to that described above.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 5453441
- Report Number(s):
- CONF-800205-7; TRN: 80-008251
- Resource Relation:
- Conference: American Institute of Metallurgical Engineers meeting, Las Vegas, NV, USA, Feb 1980
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
ALUMINIUM
CRYSTAL DEFECTS
PHYSICAL RADIATION EFFECTS
COPPER
X-RAY DIFFRACTION
CRYSTAL LATTICES
ELECTRONS
INTERSTITIALS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
LEPTONS
METALS
POINT DEFECTS
RADIATION EFFECTS
SCATTERING
TRANSITION ELEMENTS
654001* - Radiation & Shielding Physics- Radiation Physics
Shielding Calculations & Experiments
360106 - Metals & Alloys- Radiation Effects