Glassy formability and structural variation of Zr50-xCu50Al[x] (x = 0～25) alloys with respect to icosahedral short-range ordering

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  • Xu Yong
    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing
  • Chen Guoliang
    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing
  • Zhang Yong
    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing
  • Tang Fangli
    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing
  • Liu Xiongjun
    State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing

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  • Glassy Formability and Structural Variation of Zr<SUB>50−<I>x</I></SUB>Cu<SUB>50</SUB>Al<I><SUB>x</SUB></I> (<I>x</I>=0∼25) Alloys with Respect to Icosahedral Short-Range Ordering
  • Glassy Formability and Structural Variation of Zr<SUB>50&minus;<I>x</I></SUB>Cu<SUB>50</SUB>Al<I><SUB>x</SUB></I> (<I>x</I>=0&sim;25) Alloys with Respect to Icosahedral Short-Range Ordering

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In this study, effects of Al addition on the glass-forming ability, phase evolution, and structural variation of Zr50−xCu50Alx (x=0∼25) alloys are investigated by means of X-ray diffraction and scanning electron microscopy. The phase type and structure of the Zr-Cu-Al alloys strongly depend on the Al content. The main phases of the Zr45Cu50Al5 alloy are CuZr and icosahedral phase when the casting size is between 5 mm and 10 mm, but change to CuZr + glassy phase when the casting diameter is decreased to 3 mm. The intensity and number of Bragg peaks corresponding to the icosahedral phase in the Zr45Cu50Al5 alloy decrease quickly as the cooling rate increases, and finally, only a diffuse peak is seen. These results suggest that there is strong correlation between the icosahedral phase and the glassy phase in the Zr-Cu-Al alloys during rapid solidification. The structure of the glassy phase in the Zr-Cu-Al alloys shows icosahedral short-range ordering. The icosahedron with five-fold symmetry is incompatible with lattice periodicity, which presents a barrier to crystallization and improves the glassy formability.

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