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A parameter governing the plasticity of Cu–Zr containing bulk metallic glasses

✍ Scribed by Seok-Woo Lee; Chang-Myun Lee; Jae-Pyoung Ahn; Yu-Chan Kim; Jae-Chul Lee

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
570 KB
Volume
449-451
Category
Article
ISSN
0921-5093

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✦ Synopsis

Experiments were conducted on bulk metallic glasses (BMGs) to identify a crucial factor that governs the degree of the plasticity shown by these alloys. It was found that in situ formation of nanocrystallites, which is known as the deformation-induced nanocrystallization, play a key role in providing initiation sites of the local deformation, indicating that a high degree of plasticity could be achieved from BMGs in which deformation facilitates nanocrystallization. The degree of this deformation-induced nanocrystallization was found to be strongly dependent on the activation energy for crystallization. In this paper, we report that a factor governing the plasticity of BMGs lies in the activation energy for crystallization.

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Based on the consideration of the liquid phase stability, the resistance to crystallization and the glass transition enthalpy, a new criterion Q, defined as ((T g + T x )/T l )•( E/ H), where the T g , T x , T l , E and H are the glass transition temperature, the onset crystallization temperature, t