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:
- USDOE; 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
- Resource Relation:
- Conference: Conference on computer simulations of radiation effects in solids, Berlin (Germany), 23-28 Aug 1992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM ALLOYS
PHYSICAL RADIATION EFFECTS
COPPER
COPPER ALLOYS
GOLD ALLOYS
NICKEL ALLOYS
SILVER
COMPUTERIZED SIMULATION
CRYSTAL DEFECTS
DISPLACEMENT RATES
INTERMETALLIC COMPOUNDS
INTERSTITIALS
RECOILS
VACANCIES
ALLOYS
CRYSTAL STRUCTURE
ELEMENTS
METALS
POINT DEFECTS
RADIATION EFFECTS
SIMULATION
TRANSITION ELEMENTS
360106* - Metals & Alloys- Radiation Effects