Atomic-Scale Structural Evolution and Stability of Supercooled Liquid of a Zr-Based Bulk Metallic Glass

被引：130

作者：

Wang, Q. ^{[1
,2
]}

Liu, C. T. ^{[2
,3
]}

Yang, Y. ^{[2
]}

Dong, Y. D. ^{[1
]}

Lu, J. ^{[3
]}

机构：

[1] Shanghai Univ, Inst Mat Sci, Shanghai 200072, Peoples R China

[2] Hong Kong Polytech Univ, Dept Mech Engn, Hong Kong, Peoples R China

[3] City Univ Hong Kong, Dept Mfg Engn & Engn Management, Hong Kong, Hong Kong, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 21期

关键词：

FORMING ABILITY; AMORPHOUS-ALLOYS; RANGE ORDER; CRYSTALLIZATION; NANOCRYSTALLIZATION; DECOMPOSITION; ZR41.2TI13.8CU12.5NI10BE22.5; NUCLEATION; PACKING; PHASE;

D O I：

10.1103/PhysRevLett.106.215505

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In this Letter, direct experimental evidence is provided for understanding the thermal stability with respect to crystallization in the Zr41.2Ti13.8Cu12.5Ni10Be22.5 glass-forming liquid. Through high-resolution transmission electron microscopy, the atomic-structure evolution in the glass-forming liquid during the isothermal annealing process is clearly revealed. In contrast with the existing theoretical models, our results reveal that, prior to nanocrystallization, there exists a metastable state prone to forming icosahedra-like atomic clusters, which impede the subsequent crystallization and hence stabilize the supercooled liquid. The outcome of the current research underpins the topological origin for the excellent thermal stability displayed by the Zr-based bulk metallic glass.

引用

页数：4

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