Possible local superplasticity of amorphous metallic alloys in the catastrophic shear band under low temperature ductile shear failure

摘要: The vein pattern (VP) formation on the failure surfaces is a characteristic feature of low temperature ductile shear amorphous alloys. Argon and Salama proposed meniscus instability in thin liquid-like layer (layer with viscosity) as mechanism VP formation. real instant plasticity material can be estimated from plastic deformation localized single veins. In this work authors have observed magnitude these protruding This estimation has been realized by fractographic analysis fractured for various Failure after (0.5--300 K) were using TESLA BS-300 scanning electron microscope alloys deformed under uniaxial tension (Fe{sub 84}B{sub 16} Fe{sub 80}B{sub 20} ribbons cross sections 6.0 {times} 0.03 mm{sup 2}, Pd{sub 84.5}Si{sub 15.5} ribbon section 2 2}) compression (Cu{sub 50}Zr{sub 35}Ti{sub 8}Hf{sub 5}Ni{sub 2} rod 3 mm diameter).