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Interfacial free energy controlling glass-forming ability of Cu-Zr alloys.


ABSTRACT: Glass is a freezing phase of a deeply supercooled liquid. Despite its simple definition, the origin of glass forming ability (GFA) is still ambiguous, even for binary Cu-Zr alloys. Here, we directly study the stability of the supercooled Cu-Zr liquids where we find that Cu64Zr36 at a supercooled temperature shows deeper undercoolability and longer persistence than other neighbouring compositions with an equivalent driving Gibbs free energy. This observation implies that the GFA of the Cu-Zr alloys is significantly affected by crystal-liquid interfacial free energy. In particular, the crystal-liquid interfacial free energy of Cu64Zr36 in our measurement was higher than that of other neighbouring liquids and, coincidently a molecular dynamics simulation reveals a larger glass-glass interfacial energy value at this composition, which reflects more distinct configuration difference between liquid and crystal phase. The present results demonstrate that the higher crystal-liquid interfacial free energy is a prerequisite of good GFA of the Cu-Zr alloys.

SUBMITTER: Kang DH 

PROVIDER: S-EPMC4044622 | biostudies-literature | 2014 Jun

REPOSITORIES: biostudies-literature

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Interfacial free energy controlling glass-forming ability of Cu-Zr alloys.

Kang Dong-Hee DH   Zhang Hao H   Yoo Hanbyeol H   Lee Hyun Hwi HH   Lee Sooheyong S   Lee Geun Woo GW   Lou Hongbo H   Wang Xiaodong X   Cao Qingping Q   Zhang Dongxian D   Jiang Jianzhong J  

Scientific reports 20140604


Glass is a freezing phase of a deeply supercooled liquid. Despite its simple definition, the origin of glass forming ability (GFA) is still ambiguous, even for binary Cu-Zr alloys. Here, we directly study the stability of the supercooled Cu-Zr liquids where we find that Cu64Zr36 at a supercooled temperature shows deeper undercoolability and longer persistence than other neighbouring compositions with an equivalent driving Gibbs free energy. This observation implies that the GFA of the Cu-Zr allo  ...[more]

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