In-situ cyclic stress experiment at the Clinton P. Anderson Meson Physics Facility (LAMPF) for determining the effect of dislocation vibration on void growth in metals during irradiation. [Protons at LAMPF]
Experience is reported with the first in-situ cyclic-stress irradiation at LAMPF. A proton beam ion current of 3 to 6 ..mu..A of 800 MeV protons was utilized for 24 days irradiation. Radiation damage effects of 800 MeV protons incident on a 1-cm thick Cu target were calculated using the nucleon-meson transport code to determine the nuclear reactions produced by the protons, the theory of Lindhard to evaluate the resultant damage energy deposited in the target. These calculations have been extended to Al. Damage effects were nearly uniform through a 1-cm target thickness, and the results obtained can be expressed in cross section form. The calculation yielded a damage energy cross section of about 63 barn-keV, a nuclear transmutation cross section of 0.44 barns, and indicated copious hydrogen, helium, and neutron production. Analysis of the effect of dislocation vibration on the efficiency of a dislocation line as a sink for point defects predicted that dislocation vibration should suppress void growth. The effect results from the fact that the dislocation will sweep up vacancies, which diffuse less rapidly than interstitials. The growth rate of voids in Al under simultaneous proton irradiation and cyclic stressing are compared to that of samples irradiated at the same time but without any stressing. The samples are placed one behind the other along the proton path so that identical irradiation histories can be achieved. The temperature of the samples is controlled, known and uniform. The initial preirradiation state is a prestrained state of a few hundred stress cycles. The samples are irradiated without stress through the incubation period for void nucleation before the cyclic stress is applied.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6005509
- Report Number(s):
- LA-UR-79-1204; CONF-790555-1; TRN: 79-015805
- Resource Relation:
- Conference: International conference on fundamental mechanisms of radiation-Induced creep and growth, Chalk River, Canada, 8 May 1979
- Country of Publication:
- United States
- Language:
- English
Similar Records
Calculation of Radiation Damage in SLAC Targets
LAMPF (1975--1976) research highlights at the Clinton P. Anderson Meson Physics Facility
Related Subjects
ALUMINIUM
PHYSICAL RADIATION EFFECTS
COPPER
CREEP
DISLOCATIONS
LAMPF LINAC
MECHANICAL VIBRATIONS
PROTONS
STRESSES
VOIDS
ACCELERATORS
BARYONS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
HADRONS
LINE DEFECTS
LINEAR ACCELERATORS
MECHANICAL PROPERTIES
MESON FACTORIES
METALS
NUCLEONS
RADIATION EFFECTS
TRANSITION ELEMENTS
360106* - Metals & Alloys- Radiation Effects