Tuning the glass forming ability and mechanical properties of Ti-based bulk metallic glasses by Ga additions
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in: Journal of alloys and compounds, Jahrgang 793.2019, Nr. 15 July, 15.07.2019, S. 552-563.
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
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TY - JOUR
T1 - Tuning the glass forming ability and mechanical properties of Ti-based bulk metallic glasses by Ga additions
AU - Bera, Supriya
AU - Ramasamy, Parthiban
AU - Sopu, Daniel
AU - Sarac, Baran
AU - Zalesak, Jakub
AU - Gammer, Christoph
AU - Stoica, Mihai
AU - Calin, Mariana
AU - Eckert, Jürgen
PY - 2019/7/15
Y1 - 2019/7/15
N2 - A new series of Ti 40 Zr 10 Cu 36−x Pd 14 Ga 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 40 Zr 10 Cu 36−x Pd 14 Ga 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 40 Zr 10 Cu 34 Pd 14 Ga 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.
AB - A new series of Ti 40 Zr 10 Cu 36−x Pd 14 Ga 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 40 Zr 10 Cu 36−x Pd 14 Ga 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 40 Zr 10 Cu 34 Pd 14 Ga 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.
UR - http://www.scopus.com/inward/record.url?scp=85064653343&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2019.04.173
DO - 10.1016/j.jallcom.2019.04.173
M3 - Article
VL - 793.2019
SP - 552
EP - 563
JO - Journal of alloys and compounds
JF - Journal of alloys and compounds
SN - 0925-8388
IS - 15 July
ER -
