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

Journal of University of Science and Technology Beijing 2005年第3期12卷 257-261页

作者： HongchaoKou XidongHui XiongjunLiu XipingSong GuoliangChen kefuyao StateKeyLaboratoryforAdvancedMetalsandMaterials UniversityofScienceandTechnologyBeijingBeijing100083China MechanicalDepartment TsinghuaUniversityBeijing100081China

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.

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

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Observation and computer simulation of multicomponent chemical short-range order (MCSRO) for the bulk metallic glasses

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Journal of University of Science and Technology Beijing 2005年第2期12卷 143-150页

作者： GuoliangChen XidongHui kefuyao HuaiyuHou XiongjunLiu MeilingWang GuangChen StateKeyLaboratoryforAdvancedMetalsandMaterials UniversityofScienceandTechnologyBeijingBeijing100083China／／DepartmentofMaterialScienceandEngineeringNanjingUniversityofScienceandTechnologyNanjing210094China StateKeyLaboratoryforAdvancedMetalsandMaterials UniversityofScienceandTechnologyBeijingBeijing100083China DepartmentofMechanicalEngineering TsinghuaUniversityBeijing100084China. DepartmentofMaterialScienceandEngineering NanjingUniversityofScienceandTechnologyNanjing210094China

The atomic configuration of chemical short-range order (CSRO) for the Zr-base metallic glasses was investigated by using nano-diffraction and high resolution transmission electronic microscopy (HRTEM) technology with a beam size of 0.5 nm. It is il- lustrated that the pattern of atomic configuration of CSRO might have various compound counterparts because of the chemical inter- action of bonding atoms. Some atomic configuration of MCSRO is similar to the icosahedral structure with 10-fold symmetry of very weak spots. In deed, the nano-beam technology could clearly detect the evolution of atomic configuration in nanometer scale during the transformation from the metallic melt to the primary crystallization. The local atomic configuration of CSRO is also investigated by molecular dynamics simulation (MD) for the Zr2Ni compound in a wider temperature range. The CSRO in the melt could be pic- torially demonstrated as distorted coordination polyhedron of the compound structure and/or the structure similar to cubo-octahedron analogs. The MD simulation illustrates that the atomic packing of long-range order disappears just above the melting point, but the chemical interaction of bonding atoms still exists that leads to form the various CSRO with the atomic configuration similar to stable or metastable unit cell of Zr2Ni compound. The icosahedral polyhedron became more abundance as the overheating temperature was raised.

关键词： bulk metallic glasses short-range order nano-diffraction and HRTEM technology molecular dynamic simulation

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