Possible local superplasticity of amorphous metallic alloys in the catastrophic shear band under low temperature ductile shear failure
- Ukraine National Academy of Sciences, Kharkov (Ukraine). B. Verkin Inst. for Low Temperature Physics and Engineering
- Slovak Academy of Sciences, Kosice (Slovakia). Inst. of Experimental Physics
The vein pattern (VP) formation on the failure surfaces is a characteristic feature of the low temperature ductile shear failure of amorphous alloys. Argon and Salama proposed the meniscus instability in the thin liquid-like layer (layer with a low viscosity) as a mechanism of the VP formation. The real instant plasticity of the material in the liquid-like layer can be estimated from the plastic deformation localized in single veins. In this work the authors have observed and estimated the magnitude of the plastic deformation in these protruding veins. This estimation has been realized by the fractographic analysis of fractured surfaces for various amorphous alloys. Failure surfaces after the low temperature (0.5--300 K) shear failure were observed using a TESLA BS-300 scanning electron microscope for various amorphous alloys deformed under uniaxial tension (Fe{sub 84}B{sub 16} and Fe{sub 80}B{sub 20} amorphous ribbons with the cross sections of 6.0 {times} 0.03 mm{sup 2}, Pd{sub 84.5}Si{sub 15.5} amorphous ribbon with cross section of 2 {times} 0.03 mm{sup 2}) and under uniaxial compression (Cu{sub 50}Zr{sub 35}Ti{sub 8}Hf{sub 5}Ni{sub 2} amorphous rod with 3 mm diameter).
- OSTI ID:
- 382552
- Journal Information:
- Scripta Materialia, Vol. 35, Issue 6; Other Information: PBD: 15 Sep 1996
- Country of Publication:
- United States
- Language:
- English
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