Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 793, Issue -, Pages 552-563Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.04.173
Keywords
Bulk metallic glasses; Ti-alloys; Mechanical properties; Glass forming ability; Elastic softening; Viscosity
Categories
Funding
- European Commission [607080]
- European Research Council under the Advanced Grant INTELHYB e Next Generation of Complex Metallic Materials in Intelligent Hybrid Structures [ERC-2013-ADG-340025]
- CEITEC Nano Research Infrastructure, (MEYS CR, 2016-2019), CEITEC Brno University of Technology [LM2015041]
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A new series of Ti40Zr10Cu36-xPd14Gax (x = 2, 4, 8 and 10) alloys with improved plasticity and glass-forming ability (GFA) are produced. The strategy is to create local structural heterogeneity in Ti-based bulk metallic glasses (BMGs) by alloying with a soft element which has high negative enthalpy of mixing with Ti-atoms. The GFA of Ti40Zr10Cu36-xPd14Gax rods increases with increasing Ga content up to 4 at.%, and for more Ga it decreases. Minor addition of Ga (x = 2) is beneficial to improve the strength and ductility of the TiZrCuPd-based BMG due to the formation of local structural heterogeneities which facilitate the formation of a highly organized pattern of multiple shear bands under quasi-static compression. Ti40Zr10Cu34Pd14Ga2 BMG shows the best combination of compressive global strain and maximum compressive strength of similar to 4.5% and similar to 2000 MPa, respectively. Comparing the Young's modulus of Ga-containing alloys in amorphous and crystalline state we find that the amorphous state shows significant elastic softening (40-48% smaller) which is useful to reduce stress shielding effect for biomedical applications. The alloys show a remarkable thermoplastic formability as the viscosity decreases sharply by an order of magnitude in the supercooled liquid region. (C) 2019 Elsevier B.V. All rights reserved.
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