Abstract
We have used the fusible tin coating method to detect shear band heating in amorphous Zr57Ti5Cu20Ni8Al10 loaded under quasi-static uniaxial compression. High-rate load data allowed a precise determination of the duration of shearing events and final fracture. When loading was halted prior to fracture we saw no evidence of melted tin despite the presence of shear offsets up to 6 μm on some shear bands. Samples loaded to fracture showed evidence of tin melting near the fracture surface. We attribute the difference to the duration of the events, which is much longer for shear banding (milliseconds) than for fracture (microseconds).
Highlights
From the earliest investigations of metallic glasses the observation of apparently molten patterns on metallic glass fracture surfaces suggested that high temperatures could be achieved during fracture,[1] a view corroborated by measurement of the temperature of particles ejected during fracture of a Zr-based glass.[2]
If the shear band thickness in a bulk specimen was on the order of 10 μm temperature increases of several hundred kelvins would be possible,[7] and there is some evidence to suggest that fully developed shear bands in bulk specimens can be this thick.[8,9]
Direct infrared thermographic observations during plastic deformation of Zr-based glasses[10,11] show modest temperature increases (
Summary
From the earliest investigations of metallic glasses the observation of apparently molten patterns on metallic glass fracture surfaces suggested that high temperatures (exceeding the glass transition temperature) could be achieved during fracture,[1] a view corroborated by measurement of the temperature of particles ejected during fracture of a Zr-based glass.[2]. Published Online: 10 September 2014 Stephanie K.
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