Effects of small amount Ta on the characteristics of the Zr-Al-Ni-Cu-Ta bulk metallic glass

作     者：HongchaoKou XidongHui XiongjunLiu XipingSong GuoliangChen KefuYao 

作者机构：StateKeyLaboratoryforAdvancedMetalsandMaterialsUniversityofScienceandTechnologyBeijingBeijing100083China MechanicalDepartmentTsinghuaUniversityBeijing100081China 

出 版 物：《Journal of University of Science and Technology Beijing》 (北京科技大学学报（英文版）)

年 卷 期：2005年第12卷第3期

页      面：257-261页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0813[工学-建筑学] 0814[工学-土木工程] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：This work was financially supported by the National Natural Science Foundation of China (No.50171005 and 50171006) the National Hi-tech Research and Development Program of China (No.2001AA331010) the National Major Basic Research Project of China (No.G2000 67201-3) the Major Science and Technology Program of Beijing (No.H020420030320) 

主　　题：Zr-Al-Ni-Cu-Ta alloy bulk metallic glass (BMG) microstructure compressive property 

摘      要：The effects of Ta on the characteristics of the Zr-base BMG (bulk metallic glass) were investigated. Zr55Al10Ni5Cu30-xTax (x=1, 2,4) bulk metallic glasses (BMGs) with 3.5 mm diameter and 70 mm length were successfully prepared by using combined jet and copper mold casting. A small amount of Ta addition does not change the glass transition temperature, crystallization temperature, and supercooled liquid region obviously, but Ta promotes composition separation and two-stage crystallization. The stable crystalline phases include Zr2Ni, CuZr2, Al2Zr3 intermetallic compounds and Ta-rich solid solution after annealing the Zr-Al-Ni-Cu-Ta alloys at 753 K. Zr55Al10Ni5Cu30-xTax (x=1,2,4) bulk glassy alloys exhibit a better compressive strength. The stress-strain curve shows a zigzag feature, and the fracture surface shows intersecting of shear bands. It may correlate with the inhomogeneous feature of amorphous structure.