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

Han Rongdian; Weng Huimin; Zhou Xianyi; Xu Jihua; Zhu Jingsheng; Li Xiaoguang; Sha Jian; Wang Jingcheng

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

Research for Crystallization of Metallic Glass Pd_79.5Ni₄Si_16.5

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

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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 Pd_79.5Ni₄Si_16.5 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 Pd_79.5Ni₄Si_16.5[J]. Chinese Physics C, 1993, 17(S1): 33-37.

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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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通讯作者: 陈斌, [email protected]

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Research for Crystallization of Metallic Glass Pd_79.5Ni₄Si_16.5

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 Pd_79.5Ni₄Si_16.5 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.

Research for Crystallization of Metallic Glass Pd_79.5Ni₄Si_16.5

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