Journal
INTERNATIONAL JOURNAL OF MATERIALS RESEARCH
Volume 104, Issue 1, Pages 3-10Publisher
CARL HANSER VERLAG
DOI: 10.3139/146.110833
Keywords
Aluminium alloy; ECAP; Microstructure; Superplasticity; Deformation mechanism
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Funding
- Grant Agency of Czech Republic [106/07/0303]
- Ministry of Education [MSM 0021620834]
- French government
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An AA 7075 aluminium alloy with an ultra-fine grained structure was prepared through equal channel angular pressing (ECAP) at pressing temperatures T-ECAP of 120, 170, and 220 degrees C. A decrease in T-ECAP from 220 to 120 degrees C was found to lead to a more pronounced refinement of the microstructure and to worse stability of the microstructure -the onset of grain coarsening was displaced to lower temperatures. The material pressed with the highest T-ECAP exhibited superplastic behaviour at temperatures close to 400 C and grain boundary sliding was identified as the dominant operating deformation mechanism. The materials prepared with both of the lower T-ECAP exhibited only enhanced ductility of about 200%, however this behaviour was observed at temperatures as low as 200 degrees C. It was found that this low temperature superplasticity resulted from a combined operation of grain boundary sliding at selected grain boundaries and glide of lattice dislocations.
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