Stress corrosion cracking of a Zr-based bulk metallic glass

The stress corrosion cracking behaviour of the bulk glassy Zr52.5Cu17.9Al10Ni14.6Ti5 alloy (Vitreloy 105) in 0.01M Na2SO4+0.01M NaCl electrolyte was investigated under static three-point bending and anodic potentiostatic control by means of in situ stress and current measurements and subsequent frac...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2015-07, Vol.639, p.681-690
Main Authors: Gostin, Petre Flaviu, Eigel, Dimitri, Grell, Daniel, Uhlemann, Margitta, Kerscher, Eberhard, Eckert, Jürgen, Gebert, Annett
Format: Article
Language:English
Subjects:
Anodic dissolution
Bulk amorphous alloys
Casting
Cracking (fracturing)
fracture
Fracture mechanics
Mechanical characterisation
Metallic glasses
Pitting (corrosion)
Shear bands
Slip bands
Stress corrosion cracking
Zirconium base alloys
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Summary:The stress corrosion cracking behaviour of the bulk glassy Zr52.5Cu17.9Al10Ni14.6Ti5 alloy (Vitreloy 105) in 0.01M Na2SO4+0.01M NaCl electrolyte was investigated under static three-point bending and anodic potentiostatic control by means of in situ stress and current measurements and subsequent fractography analysis. Pitting takes place preferentially at edges of flat rectangular samples and those pits act as precursors to cracking. Features corresponding to shear banding, mechanical brittle cracking and anodic dissolution assisted cracking were found on the fracture surface. The presence of striations indicates a discontinuous step-wise crack propagation mode. A mechanism is proposed in which crack tip blunting is attributed to shear banding and re-sharpening is attributed to preferential anodic dissolution along shear bands.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2015.05.049