Anomalous thermal expansion in the deep super-cooled liquid region of a ZrCuAlAg bulk metallic glass
Artikel i vetenskaplig tidskrift, 2018

Bulk metallic glasses (BMGs), like other glasses, soften in the super-cooled liquid region (SCLR). Here in this work, surprisingly, a large expansion is reported occurring in the deep SCLR of a Zr 47 Cu 37 Al 8 Ag 8 BMG. Nano-crystals (NCs) are found precipitated during the anomalous expansion of Zr 47 Cu 37 Al 8 Ag 8 , but also in the SCLR of Zr 43 Cu 41 Al 8 Ag 8 that exhibits a conventional softening. It is found that there is a steep composition and density change at the NCs/amorphous matrix transition region in the former alloy, and this transition region exerts a thermal stress of about 0.15 MPa to the surrounding super-cooled liquid (SCL) and drives the soft SCL to expand severely. (Figure presented) IMPACT STATEMENT An anomalous expansion, and particularly a large expansion instead of softening, is reported occurring in the deep SCLR of a Zr-based bulk metallic glass for the first time.

Super-cooled liquid

Grain boundary

Bulk metallic glasses

Viscous flow

Nano-crystals

Författare

Q. Hu

Shenzhen University

J. M. Wang

Shenzhen University

Y. H. Yan

Shenzhen University

F. F. Luo

Jiangxi Academy of Sciences

Sheng Guo

Chalmers, Industri- och materialvetenskap, Material och tillverkning

J. Liu

Jiangxi Academy of Sciences

S. S. Chen

Shenzhen University

B. Huang

Northwestern Polytechnical University

D. P. Lu

Jiangxi Academy of Sciences

J. Z. Zou

Shenzhen University

X. R. Zeng

Shenzhen University

Materials Research Letters

2166-3831 (eISSN)

Vol. 6 2 121-129

Ämneskategorier

Keramteknik

Annan materialteknik

Metallurgi och metalliska material

DOI

10.1080/21663831.2017.1408713