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Indexed by:期刊论文

Date of Publication:2010-06-15

Journal:MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

Included Journals:SCIE、EI、Scopus

Volume:527

Issue:15

Page Number:3416-3419

ISSN No.:0921-5093

Key Words:Metallic glasses; Microstructure; Ultrasonic; Elastic property

Abstract:The present paper aims to study the crystallization behavior and the elastic properties of Cu58.1Zr35.9Al6 bulk metallic glass using ultrasonic pulse focusing method. It is found that the changes of the elastic properties and microstructure can be classified into three stages corresponding to different temperature regions. Below the glass transition temperature T-g, no structural change was observed by X-ray diffraction, and annealing only induced structural relaxation. After annealing at the super-cooled liquid region, the new phase Cu10Zr7 formed, meanwhile, some anomalous acoustic and elastic behaviors occurred near T-g (490). Above the onset crystallization temperature T-x, the elastic properties increased further with the elevated temperature and Cu8Zr3 phase was also observed besides Cu10Zr7 phase. The annealing has a significant effect on the elastic property and microstructure of Cu58.1Zr35.9Al6 bulk metallic glass, which is closely related to the annihilation of quenched-in free volume and the improvement of the atom order degree. (C) 2010 Elsevier B.V. All rights reserved.