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Tuning the glass forming ability and mechanical properties of Ti-based bulk metallic glasses by Ga additions

Bera, Supriya ; Ramasamy, Parthiban ; Sopu, Daniel ; Sarac, Baran ; Zálešák, Jakub ; Gammer, Christoph ; Stoica, Mihai ; Calin, Mariana ; Eckert, Jürgen (2019):
Tuning the glass forming ability and mechanical properties of Ti-based bulk metallic glasses by Ga additions.
793, In: Journal of Alloys and Compounds, 2019, pp. 552-563. ISSN 09258388,
DOI: 10.1016/j.jallcom.2019.04.173,
[Article]

Abstract

A new series of Ti_40Zr_10Cu_36−xPd_14Ga_x (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 Ti_40Zr_10Cu_36−xPd_14Ga_x 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. Ti_40Zr_10Cu_34Pd_14Ga_2 BMG shows the best combination of compressive global strain and maximum compressive strength of ∼4.5% and ∼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.

Item Type: Article
Erschienen: 2019
Creators: Bera, Supriya ; Ramasamy, Parthiban ; Sopu, Daniel ; Sarac, Baran ; Zálešák, Jakub ; Gammer, Christoph ; Stoica, Mihai ; Calin, Mariana ; Eckert, Jürgen
Title: Tuning the glass forming ability and mechanical properties of Ti-based bulk metallic glasses by Ga additions
Language: English
Abstract:

A new series of Ti_40Zr_10Cu_36−xPd_14Ga_x (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 Ti_40Zr_10Cu_36−xPd_14Ga_x 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. Ti_40Zr_10Cu_34Pd_14Ga_2 BMG shows the best combination of compressive global strain and maximum compressive strength of ∼4.5% and ∼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.

Journal or Publication Title: Journal of Alloys and Compounds
Volume: 793
Journal volume: 2019
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
Date Deposited: 28 Jan 2020 07:28
DOI: 10.1016/j.jallcom.2019.04.173
Official URL: https://doi.org/10.1016/j.jallcom.2019.04.173
Projects: SO 1518/1-1 (DFG)
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