Critical serrated flow features during nanoindentation in La-based bulk metallic glasses

Wei Peng, Taihua Zhang, Yuan Liu, Lei Li, Bingchen Wei

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    Wei Peng, Taihua Zhang, Yuan Liu, Lei Li, and Bingchen Wei, Critical serrated flow features during nanoindentation in La-based bulk metallic glasses, J. Univ. Sci. Technol. Beijing , 14(2007), No. S1, pp.8-12. https://dx.doi.org/10.1016/S1005-8850(07)60098-X
    Wei Peng, Taihua Zhang, Yuan Liu, Lei Li, and Bingchen Wei, Critical serrated flow features during nanoindentation in La-based bulk metallic glasses, J. Univ. Sci. Technol. Beijing , 14(2007), No. S1, pp.8-12. https://dx.doi.org/10.1016/S1005-8850(07)60098-X
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    Critical serrated flow features during nanoindentation in La-based bulk metallic glasses

    • National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China

    • State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China

    基金项目: 

    This work was financially supported by the National Natural Science Foundation of China (No.50571109, 10572142 and 10432050) and the Knowledge Innovation Program of the Chinese Academy of Sciences.

      通信作者:

      Bingchen Wei E-mail: weibc@imech.ac.cn

    中文摘要

    La57.6Al17.5(Cu,Ni)24.9 and La64Al14(Cu,Ni)22 bulk metallic glasses (BMGs) were prepared by copper-mould casting method. Plastic deformation behavior of the two BMGs at various loading rates was studied by nanoindentation. The results showed that the La57.6Al17.5(Cu,Ni)24.9 BMG with a glass transition temperature of 423 K exhibited prominent serrated flow at low loading rates, whereas less pronounced serrated flow at high rates during nanoindentation. In contrast, the La64Al14(Cu,Ni)22 BMG with a glass transition temperature of 401 K exhibited prominent serrated flow at high loading rates. The different rate dependency of serrated flow in the two La-based BMGs is related to the different glass transition temperature, and consequently the degree of viscous flow during indentation at room temperature. A smoother flow occurs in the alloy with relatively lower glass transition temperature, due to the relaxation of stress concentration.

     

    Materials

    Critical serrated flow features during nanoindentation in La-based bulk metallic glasses

    Author Affilications

      • National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China

      • State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China

    • Funds: 

      This work was financially supported by the National Natural Science Foundation of China (No.50571109, 10572142 and 10432050) and the Knowledge Innovation Program of the Chinese Academy of Sciences.

    • Received: 14 June 2006;
    La57.6Al17.5(Cu,Ni)24.9 and La64Al14(Cu,Ni)22 bulk metallic glasses (BMGs) were prepared by copper-mould casting method. Plastic deformation behavior of the two BMGs at various loading rates was studied by nanoindentation. The results showed that the La57.6Al17.5(Cu,Ni)24.9 BMG with a glass transition temperature of 423 K exhibited prominent serrated flow at low loading rates, whereas less pronounced serrated flow at high rates during nanoindentation. In contrast, the La64Al14(Cu,Ni)22 BMG with a glass transition temperature of 401 K exhibited prominent serrated flow at high loading rates. The different rate dependency of serrated flow in the two La-based BMGs is related to the different glass transition temperature, and consequently the degree of viscous flow during indentation at room temperature. A smoother flow occurs in the alloy with relatively lower glass transition temperature, due to the relaxation of stress concentration.

     

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