In-situ Mg_(77)Cu_(12)Zn_5Y_6 bulk metallic glass matrix composite with extraordinary plasticity  

作　　者：HUI Xidong DONG Wei WANG Meiling LIU Xiongjun YU Jialing CHEN Guoliang 

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

出　　处：《Chinese Science Bulletin》2006年第2期229-234,共6页

基　　金：This work was supported by the National Natural Science Foundation of China(Grant Nos.50431030,59871025&50171006);973 Project(Grant No.G2000 67201-3).

摘　　要：We report experimental evidence of in-situ Mg77Cu12Zn5Y6 bulk metallic glass (BMG) ma- trix composite with extraordinary plastic strain of 18.5% and specific strength of 4.31×105 N·m·kg?1, which are the highest plasticity and specific strength in Mg base BMG alloys reported to date. The excel- lent mechanical properties are attributed to the for- mation of the composite structure which is composed of amorphous matrix and hexagonal-close-packed (hcp) Mg solid solution needle phase with a width less than 500 nm. As plastic phase, the Mg needles not only possess the capability of deformation but also have work hardening phenomenon effect. They give rise to multiple shear bands, and hinder the propagation of local shear band in amorphous matrix.We report experimental evidence of in-situ Mg77Cu12Zn5Y6 bulk metallic glass （BMG） matrix composite with extraordinary plastic strain of 18.5% and specific strength of 4.31×10^5 N.m.kg^-1, which are the highest plasticity and specific strength in Mg base BMG alloys reported to date. The excellent mechanical properties are attributed to the formation of the composite structure which is composed of amorphous matrix and hexagonal-close-packed （hcp） Mg solid solution needle phase with a width less than 500 nm. As plastic phase, the Mg needles not only possess the capability of deformation but also have work hardening phenomenon effect. They give rise to multiple shear bands, and hinder the propagation of local shear band in amorphous matrix.

关 键 词：Mg77Cu12Zn5Y6 金属玻璃 定向凝固 共晶体复合材料 塑性 强度系数 

分 类 号：TG139.8[一般工业技术—材料科学与工程]