Radiation effects in FCC metals and intermetallic compounds: A molecular dynamics computer simulation study. [Cu[sub 3]Au; Ni[sub 3]Al]
- Lawrence Livermore National Lab., CA (United States)
- Paul Scherrer Inst. (PSI), Villigen (Switzerland)
We review recent results on atomic mixing, radiation-induced disordering, and defect production and clustering induced by displacement cascades in Cu, Ag, Cu[sub 3]Au and Ni[sub 3]Al. We employ molecular dynamics computer simulation methods with isotropic many body potentials and recoil energies near subcascade formation regime up the locally molten cascade core in the pure metals and intermetallics. Disordering of intermetallics takes place in the cascade core, but because of the short lifetime of the displacement cascade, chemical short range order is preserved in molten zone. Results reveal very large vacancy and interstitial type defect clusters at high recoil energy and cascade energy density. Vacancies agglomerate and collapse into Frank dislocation loops in quenching of the cascade molten core. Large interstitial clusters are directly produced in cascades and form prismatic dislocation loops. Fraction of defects in clusters for low temperature cascades increases with recoil energy and approaches [approx] 70 and 60% for interstitials and vacancies, at recoil energies near threshold for subcascades. In the case of intermetallics the large energy required to produce and transport a superdislocation appears to inhibit interstitial prismatic loop punching and interstitials appear as isolated (100) dumbbells.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6623935
- Report Number(s):
- UCRL-JC-112059; CONF-9208146--2; ON: DE93009546
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360106* -- Metals & Alloys-- Radiation Effects
ALLOYS
ALUMINIUM ALLOYS
COMPUTERIZED SIMULATION
COPPER
COPPER ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISPLACEMENT RATES
ELEMENTS
GOLD ALLOYS
INTERMETALLIC COMPOUNDS
INTERSTITIALS
METALS
NICKEL ALLOYS
PHYSICAL RADIATION EFFECTS
POINT DEFECTS
RADIATION EFFECTS
RECOILS
SILVER
SIMULATION
TRANSITION ELEMENTS
VACANCIES