Universality of slip avalanches in a ductile Fe-based bulk metallic glass

作者：Li, Jiao-jiao; Qiao, Jun-wei^*; Dahmen, Karin A.; Yang, Wei-ming; Shen, Bao-long; Chen, Ming-wei

来源：Journal of Iron and Steel Research International, 2017, 24(4): 366-371.

DOI：10.1016/S1006-706X(17)30054-7

• Bulk metallic glass
• Slip avalanche
• Plasticity
• \Mean-field theory model
• Strain rate

Intermittent serrated flows of a novel ductile Fe-60 Ni-20 P-13 C-7 hulk metallic glass (BMG) at variant strain rates were investigated by statistics analysis. Peak and clutter distribution of slip-avalanche magnitudes are displayed during stable plastic flows at strain rates of 2 X 10(-4) s(-1) and 5 X 10(-3) s(-1), respectively, which means that serration behavior depends on the strain rate. However, the remarkable agreement between measured slip avalanche magnitudes and the scaling behavior, i.e. a universal complementary cumulative distribution CCDF) predicted by mean-field theory (MFT) model, indicates that the plasticity of the present Fe-based BMGs can he tuned by imposed strain rates: S-max similar to epsilon(-lambda). This tuned plasticity is elucidated with expended free-volume model. Moreover, the scaling behavior of serrated flows for other strain rates can he predicted as well.

• 出版日期2017-4
• 单位中国矿业大学（北京）; 太原理工大学; 东南大学