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

Bera, Supriya and Ramasamy, Parthiban and Sopu, Daniel and Sarac, Baran and Zálešák, Jakub and Gammer, Christoph and Stoica, Mihai and Calin, Mariana and Eckert, Jürgen (2019):
Tuning the glass forming ability and mechanical properties of Ti-based bulk metallic glasses by Ga additions.
In: Journal of Alloys and Compounds, 7932019. pp. 552-563, ISSN 09258388,
DOI: 10.1016/j.jallcom.2019.04.173,
[Online-Edition: https://doi.org/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 and Ramasamy, Parthiban and Sopu, Daniel and Sarac, Baran and Zálešák, Jakub and Gammer, Christoph and Stoica, Mihai and Calin, Mariana and 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
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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