Effect of the cooling rate on plastic deformability of a Zr-based bulk metallic glass  

作　　者：ZHANG Jing, PANG ShuJie & ZHANG Tao Key Laboratory of Aerospace Materials and Performance (Ministry of Education), Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China 

出　　处：《Science China(Physics,Mechanics & Astronomy)》2010年第3期415-418,共4页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 50771006 and 50631010);the National Basic Research Program of China (Grant No. 2007CB613900);PCSIRT (Grant No. IRT0512);NCET (Grant No. NCET-07-0041)

摘　　要：The present work found the plastic deformability of Zr65Cu17.5Ni10Al7.5 BMG dependent on the cooling rate during the formation from the molten state alloy. The deformation behavior in the compression test of φ 2 mm Zr65Cu17.5Ni10Al7.5 BMGs as-cast or lathed from different sizes as-cast samples was characterized, and they exhibited different plastic strains. The compressive plastic strain increases with the decreasing diameter of the as-cast specimens, i.e. with increasing the cooling rate. It is suggested that free volume content in the BMGs, which is related to the cooling rate during the rapid solidification, could play an important role in the deformation process of the BMGs.The present work found the plastic deformability of Zr65Cu17.5Ni10Al7.5 BMG dependent on the cooling rate during the formation from the molten state alloy. The deformation behavior in the compression test of φ 2 mm Zr65Cu17.5Ni10Al7.5 BMGs as-cast or lathed from different sizes as-cast samples was characterized, and they exhibited different plastic strains. The compressive plastic strain increases with the decreasing diameter of the as-cast specimens, i.e. with increasing the cooling rate. It is suggested that free volume content in the BMGs, which is related to the cooling rate during the rapid solidification, could play an important role in the deformation process of the BMGs.

关 键 词：cooling rate SHEAR BAND SERRATION BULK metallic glass 

分 类 号：TG139.8[一般工业技术—材料科学与工程]