Evolution of shear bands and fatigue striations in a bulk metallic glass during fatigue

G. Y. Wang; P. K. Liaw; Y. Yokoyama; A. Inoue

doi:10.1016/j.intermet.2011.12.018

Evolution of shear bands and fatigue striations in a bulk metallic glass during fatigue

G. Y. Wang, P. K. Liaw, Y. Yokoyama, A. Inoue

Institute for Materials Research (IMR)

Research output: Contribution to journal › Article

9 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	96-100
Number of pages	5
Journal	Intermetallics
Volume	23
DOIs	https://doi.org/10.1016/j.intermet.2011.12.018
Publication status	Published - 2012 Apr 1

Keywords

B. Fatigue resistance and crack growth
B. Glasses, metallic
F. Mechanical testing

ASJC Scopus subject areas

Chemistry(all)
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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Wang, G. Y., Liaw, P. K., Yokoyama, Y., & Inoue, A. (2012). Evolution of shear bands and fatigue striations in a bulk metallic glass during fatigue. Intermetallics, 23, 96-100. https://doi.org/10.1016/j.intermet.2011.12.018

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title = "Evolution of shear bands and fatigue striations in a bulk metallic glass during fatigue",

abstract = "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.",

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author = "Wang, {G. Y.} and Liaw, {P. K.} and Y. Yokoyama and A. Inoue",

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AU - Wang, G. Y.

AU - Liaw, P. K.

AU - Yokoyama, Y.

AU - Inoue, A.

PY - 2012/4/1

Y1 - 2012/4/1

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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