Climb of prismatic loops in Cu--Al alloys during irradiation in the HVEM

Conference · Wed Oct 01 04:00:00 EDT 1975

OSTI ID:4087157

Kosel, T; Washburn, J

Nucleation and growth of prismatic interstitial loops was observed during irradiation in the HVEM at different temperatures and damage rates. The loops remained rhombus shaped throughout growth, with sides lying on (111) planes, suggesting low jog densities. Weak-beam electron micrographs showed that the loops were dissociated on the (111) planes containing the loop sides. A minimum damage rate, PHI/sub min/, was found to be necessary to induce growth at measurable rates. This, together with the low jog densities observed, was taken to indicate that the climb rate was affected by the rate of jog nucleation, rather than controlled entirely by the rate of diffusion of point defects to the dislocations. PHI/sub min/ was found to be smaller for alloys of higher stacking fault energies, probably due to the influence of stacking fault energy on the energy of jog formation on an extended dislocation. The growth rate was found to be constant for individual loops observed over a large size range, suggesting that jog nucleation occurred preferentially at loop corners. (auth)

• Research Organization: California Univ., Berkeley (USA). Lawrence Berkeley Lab.
• DOE Contract Number: W-7405-ENG-48
• NSA Number: NSA-33-020837
• OSTI ID: 4087157
• Report Number(s): LBL--3922; CONF-751006--25
• Country of Publication: United States
• Language: English

Related Subjects

*ALUMINIUM ALLOYS-- PHYSICAL RADIATION EFFECTS
*COPPER ALLOYS-- PHYSICAL RADIATION EFFECTS
360106* --Materials--Metals & Alloys--Radiation Effects
DISLOCATIONS
ELECTRON BEAMS
ELECTRON MICROSCOPY
INTERSTITIALS
N50240* --Metals
Ceramics
& Other Materials--Metals & Alloys--Radiation Effects