Production and properties of multicomponent Zr-based bulk amorphous alloys. | [Proceedings 6th International Bhurban Conference on Applied Sciences and Technology • 2009]

Author(s):

1. M. Iqbal: Physics Division, Directorate of Science, PINSTECH, Islamabad, Pakistan

2. J. I. Akhter: Physics Division, Directorate of Science, PINSTECH, Islamabad, Pakistan

3. M. Ahmad: Physics Division, Directorate of Science, PINSTECH, Islamabad, Pakistan

4. H. F. Zhang: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, P.R. China

5. Z. Q. Hu: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, P.R. China

Abstract:

Multicomponent bulk amorphous alloys have wide range of applications in various fields due to their attractive physical, thermal and mechanical properties. However their design and synthesis required special considerations. In the present paper, the results on synthesis of bulk amorphous Zr-based alloys (ZrCuA1Ni), designed by following the Inoue`s rules for amorphous alloys, valence electron-atom ratio (e/a ratio) and average atomic size Ra is presented. Bulk ingots of various diameters were synthesized by arc-melting and final casting by Cu mold casting technique. Characterization of alloys was done by X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and field emission scanning electron microscopy (FESEM). Thermal parameters like supercooled liquid region ΔTx, reduced glass transition temperature Trg, g, d, b and w parameters were evaluated to determine the glass-forming ability (GFA). Activation energy for crystallization was calculated using Kissinger and Ozawa equations. Crystallization and phase transformations were studied and various phases were identified in annealed samples. Mechanical properties like Vicker hardness, elastic modulus and fracture strength of two Zr- based bulk metallic glasses (BMGs) were measured and correlated with the microstructure.

Page(s): 61-69

DOI: DOI not available

Published: Journal: Proceedings 6th International Bhurban Conference on Applied Sciences and Technology , Volume: 1, Issue: 0, Year: 2009

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