Crystallization and nanoindentation behavior of a bulk Zr–Al–Ti–Cu–Ni amorphous alloy

• Published in: Journal of materials research Vol. 15; no. 3; pp. 798 - 807
• Main Authors: Wang, J. G., Choi, B. W., Nieh, T. G., Liu, C. T.
• Format: Journal Article
• Language: English
• Published: New York, USA Cambridge University Press 01.03.2000
• Subjects: ALUMINIUM ALLOYS; ANNEALING; COPPER ALLOYS; CRYSTALLIZATION; EXPERIMENTAL DATA; MATERIALS SCIENCE; MECHANICAL PROPERTIES; METALLIC GLASSES; MICROSTRUCTURE; NICKEL ALLOYS; TITANIUM ALLOYS; ZIRCONIUM ALLOYS
• ISSN: 0884-2914; 2044-5326
• DOI: 10.1557/JMR.2000.0114

The crystallization and nanoindentation behavior of a Zr–10Al–5Ti–17.9Cu–14.6Ni (at.%) bulk amorphous alloy (BAA) were studied. Resulting from the kinetic nature of phase transformation in multicomponent alloys, the crystallization path is complex. Despite the complexity of different crystallization paths, the main final crystallized product in the Zr-based BAA is Zr2Cu. Young's modulus and hardness of the BAA were found to increase with an increase in annealing temperature. The observed mechanical properties were correlated with the microstructure of the material. Also, in the present paper, both the observed crystallization and nanoindentation behavior are compared with existing data. Zr-based BAAs exhibit a ratio of hardness to Young's modulus (H/E ratio) of about 1/10, suggesting the interatomic bonding in the alloys is close to being covalent.