On the origin of intermediate temperature brittleness in La-based bulk metallic glasses

被引：7
|
作者：
Khanouki, Mohammad Taghi Asadi [1 ]
Tavakoli, Rouhollah [1 ]
Aashuri, Hossein [1 ]
机构：
[1] Sharif Univ Technol, Dept Mat Sci & Engn, Azadi Ave,POB 11155-9466, Tehran, Iran
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 770卷
关键词：
Bulk metallic glass; Shear bands; Relaxation; Ductility; Nearly constant loss; SECONDARY RELAXATION; DUCTILE TRANSITION; ACTIVATION-ENERGY; FLOW; EMBRITTLEMENT; DEFORMATION; PLASTICITY; TOUGHNESS; MECHANISM; STRAIN;
D O I：
10.1016/j.jallcom.2018.08.131
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：
The effect of strain rate on the ductility of a La-based bulk metallic glass (BMG) over a wide temperature range, and the correlation between ductility and relaxation processes within this alloy are investigated in the present work. The three point bending test and dynamic mechanical analysis are employed to study these phenomena. It is found that the activation energies of the nearly constant loss (NCL) relaxation and intermediate temperature brittleness are almost identical. This observation reveals that the NCL relaxation, as a locally confined or caged dynamics, contributes as the main source of intermediate temperature brittleness in La-based BMGs. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：535 / 539
页数：5
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