Notched Fatigue of Zr-Based Bulk Metallic Glass

Nakai, Yoshikazu; Sei, Naoki; Kim, Bok Key

doi:10.4028/www.scientific.net/KEM.345-346.259

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HomeKey Engineering MaterialsThe Mechanical Behavior of Materials XNotched Fatigue of Zr-Based Bulk Metallic Glass

Notched Fatigue of Zr-Based Bulk Metallic Glass

Abstract:

In the present study, fatigue tests of sharp-notched Zr-based bulk metallic glass (BGM), were conducted under fully reversed cyclic bending, and the fatigue crack initiation mechanisms were clarified by using AFM. The fracture surface was also observed to examine the crack propagation mechanism. The fatigue notch factor was 2.0, while the elastic stress concentration factor is 2.7. From the macroscopic observations of fractured specimen, either tension mode or shear mode fracture morphologies were observed. Either in smooth specimens or notched specimens, no prodigious sign of crack initiation were observed, i.e., fatigue cracks were initiated from shear bands those were formed just before the crack initiation.

Info:

Periodical:

Key Engineering Materials (Volumes 345-346)

Main Theme:

The Mechanical Behavior of Materials X

Edited by:

S.W. Nam, Y.W. Chang, S.B. Lee and N.J. Kim

Pages:

259-262

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.345-346.259

Citation:

Y. Nakai et al., "Notched Fatigue of Zr-Based Bulk Metallic Glass", Key Engineering Materials, Vols. 345-346, pp. 259-262, 2007

Online since:

August 2007

Authors:

Yoshikazu Nakai, Naoki Sei, Bok Key Kim

Keywords:

Amorphous Alloy, Bulk Amorphous Alloy, Fatigue Crack Initiation, Notched Fatigue

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$38.00

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1043

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Abstract: In this research, corrosion fatigue tests using tensile strength of 490MPa TMCP steel were performed in synthetic seawater condition to investigate the corrosion fatigue crack propagation characteristics. The influence of cathodic protection at -800mV vs. SCE on the corrosion fatigue crack propagation behavior was investigated. Relationships between da/dN versus ΔK for the material were obtained by two types of test specimens. In the present study, F(α,β) versus α(= 2a/W) relationship for the CCT specimen was calculated by J integral approach, while that for the CT specimen was determined from ASTM E647. It is found that the fatigue crack propagation rate of TMCP steel in synthetic seawater condition is faster than that in air condition at least twice. Also, it is observed that the fatigue crack propagation rate of steel with cathodic protection is in between those of seawater condition without cathodic protection and air condition.

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