Abstract
Crack-propagation tests on a bulk metallic glass (BMG), Zr55Cu30Ni5Al10, were conducted either in aqueous sodium chloride (NaCl) solutions or in high-purity water under sinusoidal cyclic loading or sustained loading. Although the crack growth rate in high-purity water was almost identical to that in air, the rate in the NaCl solution was much higher than that in air, even in a very low concentration of NaCl such as 0.01 mass pct. In a 3.5 mass pct NaCl solution, the time-based crack growth rate during cyclic loading, da/dt, was determined by the maximum stress-intensity factor, K max, but was almost independent of the loading frequency and the stress ratio, and the rate was close to that of stress corrosion cracking (SCC) under a sustained loading.
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Acknowledgments
The authors gratefully acknowledge the support for this work provided by the Grant-in-Aid for Scientific Research on Priority Areas “Materials Science of Bulk Metallic Glasses,” Ministry of Education, Culture, Sports, Science, and Technology (Tokyo, Japan) (head investigator: Dr. A. Inoue, President of Tohoku University, Sendai, Japan) and the Kansai Research Foundation for Technology Promotion (Osaka, Japan) (head investigator: Professor Y. Nakai, Kobe University).
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This article is based on a presentation given in the symposium “Bulk Metallic Glasses VI,” which occurred during the TMS Annual Meeting, February 15–19, 2009, in San Francisco, CA, under the auspices of TMS, the TMS Structural Materials Division, TMS/ASM: Mechanical Behavior of Materials Committee.
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Nakai, Y., Yoshioka, Y. Stress Corrosion and Corrosion Fatigue Crack Growth of Zr-Based Bulk Metallic Glass in Aqueous Solutions. Metall Mater Trans A 41, 1792–1798 (2010). https://doi.org/10.1007/s11661-009-9945-7
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DOI: https://doi.org/10.1007/s11661-009-9945-7