Radiation induced collapse of the crystalline structure. [NiTi and Zr/sub 3/Al]
Conference
·
OSTI ID:6047713
A theory of irradiation-induced amorphization of ordered intermetallic compounds, based on the destabilization of the crystalline structure by excess defect accumulation, has been developed recently. The theory is reviewed starting with its phenomenological basis, where the microstructural evolution of intermetallic compounds that are turned amorphous by irradiation is emphasized. Next, the analysis of defect buildup that suggests the formation of a stable complex defect consisting of a vacancy-interstitial pair, called a complex, is reviewed. The possibility of a radiation induced microstructure such as interstitial clusters, in addition to complexes, in intermetallics that undergo the crystalline-to-amorphous transition is incorporated into the theory. A comparison of radiation effects in NiTi and in Zr/sub 3/Al is made using a rate theory approach. In the case of the aluminide, it is found that cluster development can hinder the amorphous transition when the material is irradiated with electrons. On the other hand, enhancement of complex production in the collision cascade, explains the occurrence of the transition during ion bombardment. 15 refs., 2 figs., 1 tab.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6047713
- Report Number(s):
- CONF-8708104-2; ON: DE87014407
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360106* -- Metals & Alloys-- Radiation Effects
ALLOYS
ALUMINIUM ALLOYS
AMORPHOUS STATE
COLLISIONS
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
DIFFUSION
ENERGY
FREE ENERGY
INTERSTITIALS
ION COLLISIONS
MATHEMATICAL MODELS
NICKEL ALLOYS
ORDER-DISORDER TRANSFORMATIONS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
POINT DEFECTS
RADIATION EFFECTS
THERMODYNAMIC PROPERTIES
TITANIUM ALLOYS
VACANCIES
ZIRCONIUM ALLOYS
360102 -- Metals & Alloys-- Structure & Phase Studies
360106* -- Metals & Alloys-- Radiation Effects
ALLOYS
ALUMINIUM ALLOYS
AMORPHOUS STATE
COLLISIONS
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
DIFFUSION
ENERGY
FREE ENERGY
INTERSTITIALS
ION COLLISIONS
MATHEMATICAL MODELS
NICKEL ALLOYS
ORDER-DISORDER TRANSFORMATIONS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
POINT DEFECTS
RADIATION EFFECTS
THERMODYNAMIC PROPERTIES
TITANIUM ALLOYS
VACANCIES
ZIRCONIUM ALLOYS