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Glass Forming Ability and Mechanical Properties of Cu-Zr Alloys

Author: LiaoQiong
Tutor: ShenJun
School: Harbin Institute of Technology
Course: Materials Processing Engineering
Keywords: Cu-based amorphous alloys glass-forming ability mechanical properties
CLC: TG139.8
Type: Master's thesis
Year: 2008
Downloads: 20
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Abstract


In this paper, a series of CuZr-based bulk metallic glasses (BMGs) are fabricated by several methods. The glass forming ability and mechanical properties of Cu-Zr binary system and Cu-Zr-Al ternary system are investigated.The amorphous Cu-Zr binary ribbons with compositions of Cu50Zr50, Cu56Zr44, Cu60Zr40, Cu61.8Zr38.2 and Cu64Zr36 were prepared by melt-spinning. The rod samples were produced by sprouting of the melt into a copper mold to obtain 50-mm-long cylindrical rod with a diameter of 2 mm. The amorphous samples were characterized by x-ray diffraction (XRD) and by differential scanning calorimeter (DSC) measurements. The results show that Cu50Zr50 has the best glass forming ability in the system.By adding element Al based on Cu50Zr50, we studied the glass forming ability of (Cu50Zr50)100-xAlx (x=4,5,6,8) system. The rod samples were produced by sprouting of the melt into a copper mold to obtain 50-mm-long cylindrical rod with a diameter of 3 mm. The amorphous samples were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimeter (DSC) and differential thermal annlysis (DTA) measurements. When the Al composition is at 8 %, the ternary alloy has the best glass forming ability in this system. In this case, we prepared (Cu50Zr50)92Al8 alloy with larger diameters of 4 mm and 5 mm. The results show that the critical diameter of (Cu50Zr50)92Al8 is 4 mm. The appropriate addition of Al makes the glass forming ability much better than the Cu-Zr binary system.Mechanical behaviors of Cu-Zr-Al ternary bulk metallic glasses were evaluated at room temperature, including compressive fracture, Vickers hardness and nanoindentation. The results show that the plasticity of the alloys deceases while the Vickers hardness of the alloys changes little with the addition of Al. With the increasing of the diameter of (Cu50Zr50)92Al8 alloy, the plasticity of the alloys increases because of the presence of micrometer scale crystalline phase.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > The alloy learn with a variety of properties of alloys > Other special nature of the alloy > Amorphous alloy
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