TY - JOUR
T1 - Evolution of shear bands and fatigue striations in a bulk metallic glass during fatigue
AU - Wang, G. Y.
AU - Liaw, P. K.
AU - Yokoyama, Y.
AU - Inoue, A.
N1 - Funding Information:
The present work is supported by the National Science Foundation (NSF), the Combined Research-Curriculum Development (CRCD) Program, under EEC-9527527 and EEC-0203415, the Integrative Graduate Education and Research Training (IGERT) Program, under DGE-9987548, the International Materials Institutes (IMI) Program, under DMR-0231320, the Major Research Instrumentation (MRI) Program, under DMR-0421219, the Division of Civil, Mechanical, Manufacture, and Innovation Program, under CMMI-0900271, and the Materials World Network Program, under DMR-0909037, with Ms. M. Poats, and Drs. C. V. Hartesveldt, D. Dutta, P. W. Jennings, L. S. Goldberg, L. Clesceri, C. Huber, C. E. Bouldin, Dr. C. V. Cooper, and Dr. A. Ardell as contract monitors.
PY - 2012/4
Y1 - 2012/4
N2 - Four-point-bend fatigue experiments are conducted on rectangular beam samples of a Zr 50Cu 37Al 10Pd 3 (in atomic percent) bulk metallic glass (BMG). In general, a fatigue crack initiates from the corner of the beam sample at the tensile stress surface and subsequently grows inside during cyclic loading. As a result, many shear bands form around the crack growth path due to the plastic deformation at the crack tip. Moreover, the size of the shear-band zone shows a good relationship with the stress intensity factor range, which is similar to the plastic zone in the crystalline alloys. Moreover, the shear-band spacing is consistent with the coarse fatigue striation spacing, which implies that the fatigue-crack growth in BMGs is related to the formation of shear bands. A reasonable mechanism is proposed to understand the fatigue-crack-growth behavior in BMGs.
AB - Four-point-bend fatigue experiments are conducted on rectangular beam samples of a Zr 50Cu 37Al 10Pd 3 (in atomic percent) bulk metallic glass (BMG). In general, a fatigue crack initiates from the corner of the beam sample at the tensile stress surface and subsequently grows inside during cyclic loading. As a result, many shear bands form around the crack growth path due to the plastic deformation at the crack tip. Moreover, the size of the shear-band zone shows a good relationship with the stress intensity factor range, which is similar to the plastic zone in the crystalline alloys. Moreover, the shear-band spacing is consistent with the coarse fatigue striation spacing, which implies that the fatigue-crack growth in BMGs is related to the formation of shear bands. A reasonable mechanism is proposed to understand the fatigue-crack-growth behavior in BMGs.
KW - B. Fatigue resistance and crack growth
KW - B. Glasses, metallic
KW - F. Mechanical testing
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U2 - 10.1016/j.intermet.2011.12.018
DO - 10.1016/j.intermet.2011.12.018
M3 - Article
AN - SCOPUS:84862805568
VL - 23
SP - 96
EP - 100
JO - Intermetallics
JF - Intermetallics
SN - 0966-9795
ER -