低温下大块金属玻璃中原子结构演化与强度的相关性。

Correlation between atomic structure evolution and strength in a bulk metallic glass at cryogenic temperature.

机构信息

Laboratory for Microstructures, Shanghai University, 200444 Shanghai, China.

HASYLAB at DESY, Notkestr. 85, D-22603 Hamburg, Germany.

出版信息

Sci Rep. 2014 Jan 28;4:3897. doi: 10.1038/srep03897.

DOI:10.1038/srep03897

PMID:24469299

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3904144/

Abstract

A model Zr41.25Ti13.75Ni10Cu12.5Be22.5 (at.%) bulk metallic glass (BMG) is selected to explore the structural evolution on the atomic scale with decreasing temperature down to cryogenic level using high energy X-ray synchrotron radiation. We discover a close correlation between the atomic structure evolution and the strength of the BMG and find out that the activation energy increment of the concordantly atomic shifting at lower temperature is the main factor influencing the strength. Our results might provide a fundamental understanding of the atomic-scale structure evolution and may bridge the gap between the atomic-scale physics and the macro-scale fracture strength for BMGs.

摘要

选择Zr41.25Ti13.75Ni10Cu12.5Be22.5（原子%）模型大块非晶合金（BMG），利用高能量同步加速器 X 射线研究原子尺度结构随温度降低到低温的演化。我们发现原子结构演化与 BMG 的强度之间存在密切关系，并发现低温下协调原子移动的激活能增量是影响强度的主要因素。我们的结果可能为原子尺度结构演化提供基本的理解，并可能在原子尺度物理和 BMG 的宏观断裂强度之间架起桥梁。