中国物理B ›› 2006, Vol. 15 ›› Issue (7): 1549-1557.doi: 10.1088/1009-1963/15/7/029

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A comparative study of the structure and crystallization of bulk metallic amorphous rod Pr60Ni30Al10 and melt-spun metallic amorphous ribbon Al87Ni10Pr3

孟庆格, 李建国, 周建坤   

  1. School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, China
  • 收稿日期:2005-10-09 修回日期:2006-04-04 出版日期:2006-07-20 发布日期:2006-07-20
  • 基金资助:
    Project supported by the National Science Foundation for Outstanding Young Scientists of China (Grant No 50125101).

A comparative study of the structure and crystallization of bulk metallic amorphous rod Pr60Ni30Al10 and melt-spun metallic amorphous ribbon Al87Ni10Pr3

Meng Qing-Ge (孟庆格), Li Jian-Guo (李建国), Zhou Jian-Kun (周建坤)   

  1. School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, China
  • Received:2005-10-09 Revised:2006-04-04 Online:2006-07-20 Published:2006-07-20
  • Supported by:
    Project supported by the National Science Foundation for Outstanding Young Scientists of China (Grant No 50125101).

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摘要： Pr-based bulk metallic amorphous (BMA) rods (Pr60Ni30Al10) and Al-based amorphous ribbons (Al87Ni10Pr3) have been prepared by using copper mould casting and single roller melt-spun techniques, respectively. Thermal parameters deduced from differential scanning calorimeter (DSC) indicate that the glass-forming ability (GFA) of Pr\xj{60}Ni\xj{30}Al\xj{10} BMA rod is far higher than that of Al87Ni10Pr3 ribbon. A comparative study about the differences in structure between the two kinds of glass-forming alloys, superheated viscosity and crystallization are also made. Compared with the amorphous alloy Al87Ni10Pr3, the BMA alloy Pr60Ni30Al10 shows high thermal stability and large viscosity, small diffusivity at the same superheated temperatures. The results of x-Ray diffraction (XRD) and transmission electron microscope (TEM) show the pronounced difference in structure between the two amorphous alloys. Together with crystallization results, the main structure compositions of the amorphous samples are confirmed. It seems that the higher the GFA, the more topological type clusters in the Pr--Ni--Al amorphous alloys, the GFAs of the present glass-forming alloys are closely related to their structures.

关键词: Pr--Ni--Al amorphous alloys, amorphous structure, crystallization, glass-forming ability (GFA)

Abstract: Pr-based bulk metallic amorphous (BMA) rods (Pr60Ni30Al10) and Al-based amorphous ribbons (Al87Ni10Pr3) have been prepared by using copper mould casting and single roller melt-spun techniques, respectively. Thermal parameters deduced from differential scanning calorimeter (DSC) indicate that the glass-forming ability (GFA) of Pr60Ni30Al10 BMA rod is far higher than that of Al87Ni10Pr3 ribbon. A comparative study about the differences in structure between the two kinds of glass-forming alloys, superheated viscosity and crystallization are also made. Compared with the amorphous alloy Al87Ni10Pr3, the BMA alloy Pr60Ni30Al10 shows high thermal stability and large viscosity, small diffusivity at the same superheated temperatures. The results of x-Ray diffraction (XRD) and transmission electron microscope (TEM) show the pronounced difference in structure between the two amorphous alloys. Together with crystallization results, the main structure compositions of the amorphous samples are confirmed. It seems that the higher the GFA, the more topological type clusters in the Pr--Ni--Al amorphous alloys, the GFAs of the present glass-forming alloys are closely related to their structures.

Key words: Pr--Ni--Al amorphous alloys, amorphous structure, crystallization, glass-forming ability (GFA)

中图分类号:  (Amorphous semiconductors, metals, and alloys)

  • 61.43.Dq
66.20.-d (Viscosity of liquids; diffusive momentum transport) 81.70.Pg (Thermal analysis, differential thermal analysis (DTA), differential thermogravimetric analysis)