Improving plasticity of the Zr46Cu46Al8 bulk metallic glass via thermal rejuvenation  

作　　者：Wenli Song Xiaohe Meng Yuan Wu Di Cao Hui Wang Xiongjun Liu Xianzhen Wang Zhaoping Lu 

机构地区：[1]State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China [2]Institute for Advanced Materials and Technology.University of Science and Technology Beijing,Beijing 100083,China

出　　处：《Science Bulletin》2018年第13期840-844,共5页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(51671018,11790293,51531001,51422101,51371003,and 51671021);111 Project(B07003);International S&T Cooperation Program of China(2015DFG52600);Program for Changjiang Scholars and Innovative Research Team in University of China(IRT_14R05);the Projects of SKLAMM-USTB(2016Z04,2016-09,2016Z-16);the financial support from the Top-Notch Young Talents Program and Fundamental Research Fund for the Central Universities(FRF-TP-15-004C1)

摘　　要：In this paper, effects of cryogenic thermal cycling on deformation behavior and thermal stability of the Zr46Cu46AI8 bulk metallic glass （BMG） were studied. The results show that with the increase of the number of cryogenic thermal cycles （CTC）, thermal stability remains almost unchanged, while the plasticity is increased, indicating that the cryogenic thermal cyclic treatment is an effective way to improve plasticity of metallic glasses without distinctly deteriorating thermal stability. Our analysis suggests that the increase in the defect density resulted from the cryogenic thermal treatments are responsible for the plasticity increment. Variation of yield strength can be well interpreted from microstructural percolation which affected by both density and characteristic volume of the defect sites.In this paper,effects of cryogenic thermal cycling on deformation behavior and thermal stability of the Zr_(46)Cu_(46)Al_8bulk metallic glass(BMG)were studied.The results show that with the increase of the number of cryogenic thermal cycles(CTC),thermal stability remains almost unchanged,while the plasticity is increased,indicating that the cryogenic thermal cyclic treatment is an effective way to improve plasticity of metallic glasses without distinctly deteriorating thermal stability.Our analysis suggests that the increase in the defect density resulted from the cryogenic thermal treatments are responsible for the plasticity increment.Variation of yield strength can be well interpreted from microstructural percolation which affected by both density and characteristic volume of the defect sites.

关 键 词：Bulk metallic glasses Cryogenic thermal cycling Defect density PLASTICITY 

分 类 号：TG139.8[一般工业技术—材料科学与工程]