TY - JOUR
T1 - Influence of grain size on the density of deformation twins in Cu-30%Zn alloy
AU - Li, Y.
AU - Zhao, Y. H.
AU - Liu, W.
AU - Xu, C.
AU - Horita, Z.
AU - Liao, X. Z.
AU - Zhu, Y. T.
AU - Langdon, T. G.
AU - Lavernia, E. J.
N1 - Funding Information:
The authors would like to acknowledge financial supports from the Office of Naval Research (Grant number N00014-08-1-0405 ).
PY - 2010/6
Y1 - 2010/6
N2 - Mechanical properties of nanostructured (NS) materials are significantly affected by both grain size and twin density, and the twin density has a close relationship with the grain size. Therefore, it is fundamentally important to understand the influence of grain size on the density of deformation twins in NS materials. In this study, we selected Cu-30%Zn alloy as a model material to study this phenomenon, because it has low stacking fault energy of 7mJm-2 and twinning is its dominant deformation mechanism. High-pressure torsion (HPT), equal channel pressing (ECAP) and ECAP followed by rolling were used to achieve a wide range of grain size from about 3μm to 70nm. It is found that, with decreasing grain size, the average distance between deformation twins decreases gradually from 177nm to 24nm, while the density of deformation twins (the length of twin boundary in unit area) exhibit a maximum value at ECAP+95% rolling sample with average grain size of 110nm. Careful statistics analysis reveals two optimum grain size ranges 60-80nm and 40-50nm for maximum twin density values for ECAP+95% rolling and HPT Cu-30%Zn samples, respectively. The underlying mechanisms governing the influence of grain size on twinning is discussed.
AB - Mechanical properties of nanostructured (NS) materials are significantly affected by both grain size and twin density, and the twin density has a close relationship with the grain size. Therefore, it is fundamentally important to understand the influence of grain size on the density of deformation twins in NS materials. In this study, we selected Cu-30%Zn alloy as a model material to study this phenomenon, because it has low stacking fault energy of 7mJm-2 and twinning is its dominant deformation mechanism. High-pressure torsion (HPT), equal channel pressing (ECAP) and ECAP followed by rolling were used to achieve a wide range of grain size from about 3μm to 70nm. It is found that, with decreasing grain size, the average distance between deformation twins decreases gradually from 177nm to 24nm, while the density of deformation twins (the length of twin boundary in unit area) exhibit a maximum value at ECAP+95% rolling sample with average grain size of 110nm. Careful statistics analysis reveals two optimum grain size ranges 60-80nm and 40-50nm for maximum twin density values for ECAP+95% rolling and HPT Cu-30%Zn samples, respectively. The underlying mechanisms governing the influence of grain size on twinning is discussed.
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U2 - 10.1016/j.msea.2010.02.076
DO - 10.1016/j.msea.2010.02.076
M3 - Article
AN - SCOPUS:77952878254
SN - 0921-5093
VL - 527
SP - 3942
EP - 3948
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
IS - 16-17
ER -