Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 493, Issue 1-2, Pages 123-129Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2007.11.074
Keywords
copper alloys; ductility; high-pressure torsion; severe plastic deformation; stacking fault energy
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Bulk ultrafine-grained (UFG) materials produced by severe plastic deformation (SPD) often have low ductility. A previous study demonstrated the possibility of lowering the stacking fault energy to simultaneously increase the strength and ductility. This paper demonstrates, there exists an optimal stacking fault energy for the best ductility in UFG Cu-Zn alloys processed by the same SPD processing. When the stacking fault energy is too low, the grain size lies below 15 run after SPD processing and the stacking faults are saturated so that it is difficult to accumulate dislocations and deformation twins during the subsequent tensile testing. These results provide significant guidance for the future design of UFG and nanocrystalline alloys for achieving high ductilities. (c) 2007 Elsevier B.V. All rights reserved.
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