Accession Number : AD0737558

Title :   Lattice Thermal Conductivity of a Neutron-Irradiated Copper-Aluminum Alloy,

Corporate Author : CONNECTICUT UNIV STORRS DEPT OF PHYSICS

Personal Author(s) : Friedman,A. J. ; Chu,T. K. ; Klemens,P. G. ; Reynolds,C. A.

Report Date : JAN 1972

Pagination or Media Count : 28

Abstract : Low temperature thermal conductivity results are presented on two Cu + 9 at % Al polycrystals which show that fast-neutron irradiation has two effects on a cold-worked sample of this alloy. In the well-annealed specimen, irradiation produced defects which scatter long wavelength phonons, giving a well-defined 1/(T squared) contribution to the lattice thermal resistivity. Observations by other authors using electron microscopy suggest that the defects are planar vacancy generated dislocation loops 75-100A in diameter. The loop density is calculated from the thermal resistivity, and found to be in reasonable agreement with the electron microscopy results. In the second sample, deformed in tension at room temperature and then annealed at 573K prior to irradiation, the same irradiation treatment produced a contribution to the lattice resistivity which was similar in temperature dependence but larger, by a factor of three, than that produced in the well annealed specimen. A model for this effect is suggested. (Author)

Descriptors :   (*COPPER ALLOYS, THERMAL CONDUCTIVITY), ALUMINUM ALLOYS, CRYSTAL LATTICES, NEUTRON REACTIONS, DAMAGE, RADIATION EFFECTS, CRYSTAL DEFECTS, ELECTRICAL CONDUCTIVITY, DISLOCATIONS, DEFORMATION, ANNEALING, CRYOGENICS

Subject Categories : Metallurgy and Metallography
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE