Journal article
Effect of Crystallization on the Mechanical Properties of Zr{sub 56.7}Cu{sub 15.3}Ni{sub 12.5}Nb{sub 5.0}Al{sub 10.0}Y{sub 0.5} Bulk Amorphous Alloy
Materials Science and Engineering. A. Structural Materials: Properties, Microstructure and Processing, Vol.394(1-2), pp.302-311
03/15/2005
Handle:
https://hdl.handle.net/2376/104246
Abstract
Effects of crystallization behavior on the mechanical properties of Zr{sub 56.7}Cu{sub 15.3}Ni{sub 12.5}Nb{sub 5.0}Al{sub 10.0}Y{sub 0.5} based bulk amorphous alloy (BAA) were studied. Differential scanning calorimetry (DSC) in Ar environment showed three-exothermic peaks at 395, 472 and 659.5 C and one-endothermic peak at 852 C. Following DSC study, as received BAA samples were heat-treated in vacuum at six different temperatures 300, 450, 600, 700, 800 and 850 C. Heat-treated samples were characterized using Vickers microhardness, X-ray diffraction (XRD), differential scanning calorimetry and field emission scanning electron microscopy (FESEM) to study crystallization behavior. It is found that samples heat-treated above the second (472 C) and third (659.5 C) exothermic peaks show high microhardness values compared to the as processed samples, and brittle cracking along the indent diagonal. As processed samples show clear evidence of shear banding. FESEM examination revealed existence of nano-scale precipitates for samples heat-treated at 600 and 700 C, while micro-scale precipitates for 850 C samples. Quasi-static compression tests showed compressive strain to failure decrease with heat-treated samples compared to as received ones. Fracture morphology of the compression test samples changes from vein pattern for as received to flat facets with multiple cracks for heat-treated samples. Indentation fracture toughness values decrease almost an order of magnitude for heat-treated samples compared to as received samples.
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Details
- Title
- Effect of Crystallization on the Mechanical Properties of Zr{sub 56.7}Cu{sub 15.3}Ni{sub 12.5}Nb{sub 5.0}Al{sub 10.0}Y{sub 0.5} Bulk Amorphous Alloy
- Creators
- Kakoli DasAmit BandyopadhyayYogendra M Gupta
- Publication Details
- Materials Science and Engineering. A. Structural Materials: Properties, Microstructure and Processing, Vol.394(1-2), pp.302-311
- Academic Unit
- Physics and Astronomy, Department of; Mechanical and Materials Engineering, School of
- Publisher
- United States
- Identifiers
- 99900546803301842
- Language
- English
- Resource Type
- Journal article