SHEAR FAILURE OF AMORPHOUS ALLOY AT NANOINDENTATION

The amorphous alloy with nominal composition Fe40Ni40BB 20 (at. %) was studied by nanoindentation method with cube corner indenter at different loading rates from 0.05 to 100 mN.s . At certain loading rates discontinuities (pop-ins) were observed on the nanoindentation curves. The shear band density...

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Bibliographic Details
Published in:Powder Metallurgy Progress 2015-01, Vol.15, p.105-109
Main Authors: Hurakova, M, Csach, K, Miskuf, J, Jurikova, A, Demcak, S, Ocelik, V, De Hosson, J Th M
Format: Article
Language:English
Subjects:
Amorphous alloys
Failure
Loading rate
Metallic glasses
Nanoindentation
Plastic deformation
Shear
Slip bands
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Summary:The amorphous alloy with nominal composition Fe40Ni40BB 20 (at. %) was studied by nanoindentation method with cube corner indenter at different loading rates from 0.05 to 100 mN.s . At certain loading rates discontinuities (pop-ins) were observed on the nanoindentation curves. The shear band density was compared with the pop-in presence on the loading parts of nanoindentation curve. After the initial stage of the indentation the distance of observed shear bands increases until reaches its maximal value and subsequently decreases. During nanoindentation the stepwise plastic deformation occurs and the catastrophic failure is suppressed. Using scanning electron microscopy the shear band pattern on the indent region was observed.
ISSN:1335-8987