Nontoxic, precious-metal-free titanium-based metallic glasses with exceptional glass-forming ability and high specific strength

Author:

Chen Lei12,Thaiyanurak Tittaya12,Wang Zhengming12ORCID,Ayers Madeline3ORCID,Zaitseva Natalia4,Xu Donghua12ORCID

Affiliation:

1. Materials Science Program, Oregon State University 1 , Corvallis, Oregon 97331, USA

2. School of Mechanical, Industrial and Manufacturing Engineering, Oregon State University 2 , Corvallis, Oregon 97331, USA

3. School of Civil and Construction Engineering, Oregon State University 3 , Corvallis, Oregon 97331, USA

4. School of Electrical Engineering and Computer Science, Oregon State University 4 , Corvallis, Oregon 97331, USA

Abstract

Titanium-based metallic glasses (TBMGs) are attracting broad interest due to their simultaneous light weight, superhigh strength, and specific strength, exceptional wear- and corrosion-resistance and biocompatibility, desirable for electronic, biomedical, and aerospace applications. However, the glass-forming ability (GFA) of TBMGs, except some containing significant amount of toxic (Be) or precious (Pd, Ag) elements, is disappointingly low, as manifested by a critical casting diameter (dc) not more than 6 mm, which significantly restricts their manufacturing and applications. Here, we report our discovery of a series of TBMGs in the (TiZrHf)x(CuNi)y(SnSi)z pseudo-ternary system. These alloys possess an exceptionally large dc, reaching up to 12 mm, doubling the current record for Be and precious-metal free TBMGs. Moreover, these alloys exhibit a low density (7.0–7.3 g/cm3), high fracture-strength (up to ∼2700 MPa), high specific fracture-strength (up to ∼370 N m g−1), and even good plasticity with a plastic strain of up to 9.4% upon compression. They also possess high activation energy for crystallization and high atomic packing efficiency, which provide an initial physical account for their exceptional GFA and manufacturability.

Funder

National Science Foundation

Publisher

AIP Publishing

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