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大块金属玻璃Zr41Ti14Cu12.5Ni10Be22.5的流变行为研究

王敬丰 柳 林 蒲 健 肖建中

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大块金属玻璃Zr41Ti14Cu12.5Ni10Be22.5的流变行为研究

王敬丰, 柳 林, 蒲 健, 肖建中

The rheological behavior of bulk metallic glass Zr41Ti14Cu12.5Ni10Be22.5

Wang Jing-Feng, Liu Lin, Pu Jian, Xiao Jian-Zhong
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  • 采用静态拉伸方法在连续升温条件下动态地测量了大块金属玻璃Zr41Ti14Cu12.5Ni10Be22.5(Vit1)的黏度随温度的变化关系.在应变速率与温度的关系曲线中,观测到了与玻璃转变和晶化过程相联系的多个应变速率峰.在玻璃转变温度Tg以上,大块金属玻璃Zr41Ti14Cu12.5Ni10Be22.5的过冷液体呈现Newton流体特征,其黏度与温度的关系符合VogelFulcher-Tammann (VFT)关系式,拟合得到脆度D*=36,VFT温度T0=319K,脆度参数m=30,这说明Zr41T
    The temperature dependence of viscosity of the bulk metallic glass Zr41Ti14Cu12.5Ni10Be22.5(Vit1)under constant heating condition was obtained by application of static extension measurement. A few strain rate peaks, which are associated with the glass transition and multistep crystallization, were observed in the temperature-strain rate curve. Above the glass transition temperature, the supercooled liquid of the bulk metallic glass showed the Newtonian rheological characteristic, and its temperature dependences of viscosity in supercooled liquid region can be fitted well with the Vogel-Fulcher-Tammann(VFT) equation. The sample exhibited the fragility parameter D* value of 36, the VFT temperature T0 of 319K and the fragility m value of 30 It was shown that the Vit1 alloy is a strong liquid, similar to sodium silicate liquids. However, the relation between temperature and viscosity deviated from VFT equation below the glass transition temperature.The phenomenon is tentatively interpreted in terms of free-volume model and structure relaxation concept.
    • 基金项目: 国家自然科学基金(批准号:59971020和50171028),香港理工大学研究基金(批准号:GYW67)和武汉理工大学新材料国家重点实验室资助的课题.
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  • 文章访问数:  7016
  • PDF下载量:  823
  • 被引次数: 0
出版历程
  • 收稿日期:  2003-04-07
  • 修回日期:  2003-09-07
  • 刊出日期:  2004-03-05

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