A model of creep at intermediate temperatures in aluminium
- 1 January 1985
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine A
- Vol. 51 (1) , 157-174
- https://doi.org/10.1080/01418618508245275
Abstract
A new model of creep at intermediate temperatures in Al is presented, based on a set of previous results of in situ experiments. This model explains the origin of the high forward stresses necessary to extract dislocations from sub-boundaries, and the strong correlation between the speed of sub-boundary migration and the creep rate, asevidenced at different temperatures and by means of in situ strain-rate jumps. High stresses originate from incompatibilities of glide which occur during migration. Under such conditions, it is shown that the creep rate is controlled by a geometrically necessary glide of screw dislocation segments in {100} planes, i.e. by nucleation and propagation of kinks in these non-compact. As the kink energy is estimated from an experimental determination of the ‘dissociation’ energy in Al, all the parameters of the creep law are in good agreement with experimental values.Keywords
This publication has 15 references indexed in Scilit:
- In situ creep experiments in weak beam conditions, in al at intermediate temperature interaction of dislocations with subboundariesActa Metallurgica, 1984
- Evolution of internal stresses and substructure during creep at intermediate temperaturesActa Metallurgica, 1984
- Recovery in deformed copper and nickel single crystalsJournal of Materials Science, 1983
- Microstructure of aluminium during creep at intermediate temperatures—III. The rate controlling processActa Metallurgica, 1983
- Dynamic recrystallization and dynamic recovery in single crystals of nickel and copperActa Metallurgica, 1983
- Microstructure of aluminium during creep at intermediate temperature—II. In situ study of subboundary propertiesActa Metallurgica, 1982
- Cross-slip on {110} planes in aluminum single crystals compressed along 〈100〉 axisActa Metallurgica, 1975
- On the Energy of the Hexagonal Frank Loop in Face Centred Cubic MetalsPhysica Status Solidi (b), 1972
- L'activation thermique des déviations sous faibles contraintes dans les structures h.c. et c.c. ParPhysica Status Solidi (b), 1968
- Interaction of nonparallel, noncoplanar dislocationsActa Metallurgica, 1965