Fracture Stress of Ultrahigh Strength Ribbons Determined by Microhardness

Kornel Csach; Jozef Miškuf; Alena Juríková

doi:10.4028/www.scientific.net/KEM.586.108

Paper Titles

Change in Mechanical Properties of Weld Claddings after Cyclic Thermal Loading
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Digital Image Correlation Based Method of Crack Growth Rate and Fracture Toughness Measurements on Mini-Samples
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Microstructure and Local Mechanical Properties of Cu-Co Alloys after Severe Plastic Deformation
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Fatigue Cracking Processes of a Thick-Walled Component of a Chemical Pipeline
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Fracture Stress of Ultrahigh Strength Ribbons Determined by Microhardness
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Nanoindentation-Induced Phase Transformation in Silicon Thin Films
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Local Tribological Characteristics of Steel Sheets for Microforming
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Micro-Mechanical Testing of Metal Foam Cell Walls Using Miniature Three-Point Bending
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Comparison of the Natural Ageing Behaviour of EN AW 6082 and Lead Free EN AW 6023 Aluminium Alloys
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HomeKey Engineering MaterialsKey Engineering Materials Vol. 586Fracture Stress of Ultrahigh Strength Ribbons...

Fracture Stress of Ultrahigh Strength Ribbons Determined by Microhardness

Abstract:

Ultrahigh strength amorphous alloys Fe65.9Cr11.6Si7.5B15 and Co43Ta5.5Fe20B31.5 prepared by rapid quenching have the form of ribbons with thickness of about 40 micrometers with some imperfections in the sample width and the cross section. Fractographic analysis of Co- and Fe-based high strength soft magnetic materials showed the high localization of the plastic deformation and the ductility in narrow shear bands. To estimate the fracture stress, the Vickers microhardness and the average width of dimples (or the wavelength of the vein features) on the fracture surface were used. Based on the microhardness, the tensile yield strength was calculated as 4 and 5 GPa for Fe-based and Co-based glass, respectively. We estimated the fracture toughness from the measured mean value of the dimple size.