Nucleation study for an undercooled melt of intermetallic NiZr

被引:5
|
作者
Kobold, R. [1 ,2 ]
Kolbe, M. [1 ]
Hornfeck, W. [3 ]
Herlach, D. M. [1 ,2 ]
机构
[1] Deutsch Zentrum Luft & Raumfahrt DLR, Inst Mat Phys Weltraum, D-51170 Cologne, Germany
[2] Ruhr Univ Bochum, Fak Phys & Astron, D-44780 Bochum, Germany
[3] Czech Acad Sci, Inst Phys, Dept Struct Anal, Slovance 2, Prague 18221, Czech Republic
来源
JOURNAL OF CHEMICAL PHYSICS | 2018年 / 148卷 / 11期
关键词
GLASS;
D O I
10.1063/1.5018135
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Electrostatic levitation is applied in order to undercool liquid glass forming NiZr significantly below its melting temperature. For NiZr large undercoolings are found to be highly reproducible with this experimental method. One single NiZr sample of high purity is undercooled 200 consecutive times which leads to a distribution function of undercooling temperatures. Within a statistical approach of classical nucleation theory, the undercooling distribution is analyzed yielding parameters, e.g., a pre-exponential factor of KV approximate to 10(35) m(-3) s(-1), which indicates homogeneous nucleation. This result is consistent with the crystallization behavior of NiZr at high undercooling and with the corresponding microstructural analysis. Since NiZr is a representative of the very common CrB structure type, with 132 isostructural phases existing, understanding its nucleation behavior adds important knowledge to the nucleation of binary alloys in general. Published by AIP Publishing.
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页数:6
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