TY - JOUR
T1 - Determining the optimal stacking fault energy for achieving high ductility in ultrafine-grained Cu-Zn alloys
AU - Zhao, Y. H.
AU - Liao, X. Z.
AU - Horita, Z.
AU - Langdon, T. G.
AU - Zhu, Y. T.
PY - 2008/10/15
Y1 - 2008/10/15
N2 - 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 nm 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. © 2007 Elsevier B.V. All rights reserved.
AB - 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 nm 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. © 2007 Elsevier B.V. All rights reserved.
KW - Copper alloys
KW - Ductility
KW - High-pressure torsion
KW - Severe plastic deformation
KW - Stacking fault energy
KW - Copper alloys
KW - Ductility
KW - High-pressure torsion
KW - Severe plastic deformation
KW - Stacking fault energy
KW - Copper alloys
KW - Ductility
KW - High-pressure torsion
KW - Severe plastic deformation
KW - Stacking fault energy
UR - http://www.scopus.com/inward/record.url?scp=49849099839&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-49849099839&origin=recordpage
U2 - 10.1016/j.msea.2007.11.074
DO - 10.1016/j.msea.2007.11.074
M3 - RGC 21 - Publication in refereed journal
SN - 0921-5093
VL - 493
SP - 123
EP - 129
JO - Materials Science and Engineering A
JF - Materials Science and Engineering A
IS - 1-2
ER -