| Effects of small amount Ta on the characteristics ofthe Zr-Al-Ni-Cu-Ta bulk metallic glass |
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| 作者姓名： | HongchaoKou XidongHui XiongjunLiu XipingSong GuoliangChen KefuYao |
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| 作者单位： | [1]StateKeyLaboratoryforAdvancedMetalsandMaterials,UniversityofScienceandTechnologyBeijing,Beijing100083,China [2]MechanicalDepartment,TsinghuaUniversity,Beijing100081,China |
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| 基金项目： | 国家自然科学基金，the National Hi-tech Research and Development Program of China，the National Major Basic Research Project of China，the Major Science and Technology Program of Beijing |
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| 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 ZrENi, CuZr2, AlEZr3 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.
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| 关 键 词： | Zr-Al-Ni-Cu-Ta合金 金属玻璃 显微结构 结晶温度 |
Effects of small amount Ta on the characteristics of the Zr-Al-Ni-Cu-Ta bulk metallic glass |
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| HongchaoKou XidongHui XiongjunLiu XipingSong GuoliangChen KefuYao.Effects of small amount Ta on the characteristics ofthe Zr-Al-Ni-Cu-Ta bulk metallic glass[J].Journal of University of Science and Technology Beijing,2005,12(3):257-261. |
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| Authors: | Hongchao Kou Xidong Hui Xiongjun Liu Xiping SONG Guoliang Chen Kefu Yao |
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| Abstract: | 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. |
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| Keywords: | Zr-Al-Ni-Cu-Ta alloy bulk metallic glass (BMG) microstructure compressive property |
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