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Chinese Physics C> 1993, Vol. 17> Issue(S1) : 33-37 

Research for Crystallization of Metallic Glass Pd79.5Ni4Si16.5

  •  1 Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui, China;

  •  2 Structurc Research Laboratory, University of Science and Technology of China, Chinese Academy of Sciences, Hefei, Anhui, China;

  •  3 International Center for Materials Physics, Chinese Academy of Sciences, Shenyang, Liaoning, China;

  •  4 Shanghai Institute of Steel and Iron, Shanghai, China

  • The monoenergetic slow positron beam was first used to study the crystallization process of metallic glasses. The measurement of Doppler broadening spectra as a function of positron beam energy was performed on the samples of the metallic glass Pd79.5Ni4Si16.5 with various states (i.e., the as-quenched state, structural relaxation states and crystalline states). It is shown that there are a great number of the vacancy-type defects in the as-quenched state sample. Its crystallization process starts at the sample surfaces. The present research indicates that the slow positron annihilation spectroscopy (SPAS) is one of most effective methods for studying the crystallization process of metallic glasses.
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Han Rongdian, Weng Huimin, Zhou Xianyi, Xu Jihua, Zhu Jingsheng, Li Xiaoguang, Sha Jian and Wang Jingcheng. Research for Crystallization of Metallic Glass Pd79.5Ni4Si16.5[J]. Chinese Physics C, 1993, 17(S1): 33-37.
Han Rongdian, Weng Huimin, Zhou Xianyi, Xu Jihua, Zhu Jingsheng, Li Xiaoguang, Sha Jian and Wang Jingcheng. Research for Crystallization of Metallic Glass Pd79.5Ni4Si16.5[J]. Chinese Physics C, 1993, 17(S1): 33-37. shu
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Received: 1991-12-02
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    Partly supported by Ion Beam Laboratory, Shanghai Institute of Metallurgy, Chinese Academy of Sciences and Structure Research Laboratory, University of Science and Technology of China, Chinese Academy of Sciences, China.

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Research for Crystallization of Metallic Glass Pd79.5Ni4Si16.5

  • 1 Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui, China;
  • 2 Structurc Research Laboratory, University of Science and Technology of China, Chinese Academy of Sciences, Hefei, Anhui, China;
  • 3 International Center for Materials Physics, Chinese Academy of Sciences, Shenyang, Liaoning, China;
  • 4 Shanghai Institute of Steel and Iron, Shanghai, China
  • Received Date: 1991-12-02
Fund Project:  Partly supported by Ion Beam Laboratory, Shanghai Institute of Metallurgy, Chinese Academy of Sciences and Structure Research Laboratory, University of Science and Technology of China, Chinese Academy of Sciences, China.

Abstract: The monoenergetic slow positron beam was first used to study the crystallization process of metallic glasses. The measurement of Doppler broadening spectra as a function of positron beam energy was performed on the samples of the metallic glass Pd79.5Ni4Si16.5 with various states (i.e., the as-quenched state, structural relaxation states and crystalline states). It is shown that there are a great number of the vacancy-type defects in the as-quenched state sample. Its crystallization process starts at the sample surfaces. The present research indicates that the slow positron annihilation spectroscopy (SPAS) is one of most effective methods for studying the crystallization process of metallic glasses.

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