Microstructure of triple-beam ion irradiated Fe and Fe-Cr alloys
The development of defect structures in Fe-10% Cr, triple-beam (He/sup +/, D/sub 2//sup +/ and 4 MeV Fe/sup + +/) ion irradiated to 10 dpa at temperatures from 725 to 950 K has been studied. Limited cavity formation was observed. Peak swelling of approx. 0.02% occurred at irradiation temperatures of approx. 850 K. Similar irradiations at this temperature led to approx. 0.22% swelling in iron, while no cavities were observed in Fe-5% Cr. Calculations have shown that cavities formed at 875 K and above are more bubble-like than those at lower temperatures. Dislocation structures varied from interstitial dislocation loops with b = a<100> at low temperatures to a coarse dislocation network at 850 K. Large dislocation loops had a convoluted shape which suggested that loop growth had occurred preferentially in <110> directions. The results are discussed and related to current swelling suppression mechanisms for ferritic steels.
- Research Organization:
- Oak Ridge National Lab., TN (USA); Virginia Univ., Charlottesville (USA). Dept. of Materials Science
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6303585
- Report Number(s):
- CONF-810831-32; ON: DE81028347
- Country of Publication:
- United States
- Language:
- English
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ALLOYS
CHARGED PARTICLES
CHROMIUM ALLOYS
CRYSTAL STRUCTURE
DEFECTS
DEUTERIUM IONS
ELEMENTS
HELIUM IONS
IONS
IRON
IRON ALLOYS
METALS
MICROSTRUCTURE
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
SWELLING
TRANSITION ELEMENTS