Climb and Glide Dislocation Sources in Quenched Aluminum Alloys
- Lawrence Berkeley Laboratory (LBL), Berkeley, CA (United States)
Concentric dislocation loops are observed frequently in slowly quenched aluminum alloys (for a review see 1). In Al-Cu alloys containing Si as an impurity the loops are found to lie in {111} planes in configurations that have been inferred to arise from the operation of Frank-Read glide sources. On the other hand, in Al-Mg and Al-Si alloys detailed analysis has shown that the loops form by dislocation climb in the manner proposed by Bardeen and Herring. Recent work has shown that all multiple loop configurations in A1 and its alloys have a common origin, and result from dislocation nucleation and/or vacancy condensation in the vicinity of inclusion particles (2). These processes occur to relieve the large compressive strains which are generated in the lattice around the misfitting particle. It is not clear, however, under what specific conditions the various processes, i.e. vacancy condensation, glide or climb loop generation, will operate. In the present paper it is shown that in Al-Si both climb and glide loops can be produced concurrently.
- Research Organization:
- University of California, Berkeley, CA (United States); Lawrence Berkeley Laboratory (LBL), Berkeley, CA (United States)
- Sponsoring Organization:
- US Energy Research and Development Administration (ERDA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 7273941
- Report Number(s):
- LBL--4963; CONF-760803-3
- Country of Publication:
- United States
- Language:
- English
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