Research for Crystallization of Metallic Glass Pd79.5Ni4Si16.5 by Slow Positron Beam

HAN Rong-Dian; WENG Hui-Min; ZHOU Xian-Yi; XU Ji-Hua; ZHU Jing-Sheng; LI Xiao-Guang; SHA Jian; WANG Jing-Cheng

Chinese Physics C> 1993, Vol. 17> Issue(4) : 300-304

Research for Crystallization of Metallic Glass Pd_79.5Ni₄Si_16.5 by Slow Positron Beam

Department of Modern Physics,University of Science and Technology of China,Hefei 2300262 Structure Research Laboratory,University of Science and Technology of China,Academia Sinica,Hefei 2300263 International Center for materials Physics,Academia Sinica,Shenyang 1100154 Shanghai Institute of Steel and Iron,Shanghai 200940

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Abstract：
The monoenergetic slow positron beam was first used to study the crystalliation process of metallic glasses.The measurement of Doppler broadening spectra as a function of positron energy was made on the samples of metallic glass Pd_79.5Ni₄Si_16.5 in various states.It is shown that there are a number of the vacancy-like defects in the as-quenched state sample.Its crystallization started at the sample surface.Slow position beam turned out to be an effective probe to study the structural change of metallic glasses.

References

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W. Brandt, A. Dupasquier, Positron Solid State Physics, North-Holland, Amsterdam. 1983[2]H. S. Chen, Phys. star. sol., (a) 34(1976), 127:[3]T'. Tagawa, et al., Phys. star. sol., (a) 51(1979), 249.[4]S. Y. Cltuang, et al., Phys. star. sol., (a) 48(1.978), K181.[5]J. Y. Li-Kauppila, et al., Appl. Pkys., A27(1982), 31.[6]Huimin Weng, Xuezhe Guo, Rongdian Han, Xingjun Shi, Jingsheng Zhu, Texiu Zhao, Xiaping Wang, Nuclear Instr. Meth. Phys. Res., X1307(1991), 577[7]黄胜涛,非晶态材料的结构和结构分析,科学出版社(1987).[8]Zhou Xianyi, Liu Zhiguo, Zhu Yuping, Cheng Guanghui, teen Yong, Zhang Qirui, Guan Weiyan, Solid State Communi., 69(1989), 981.[9]王震西,郭贻诚,非晶态物理学,科学出版社(1984).

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HAN Rong-Dian, WENG Hui-Min, ZHOU Xian-Yi, XU Ji-Hua, ZHU Jing-Sheng, LI Xiao-Guang, SHA Jian and WANG Jing-Cheng. Research for Crystallization of Metallic Glass Pd_79.5Ni₄Si_16.5 by Slow Positron Beam[J]. Chinese Physics C, 1993, 17(4): 300-304.

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Received: 1900-01-01
Revised: 1900-01-01

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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 by Slow Positron Beam

Corresponding author: HAN Rong-Dian,

Department of Modern Physics,University of Science and Technology of China,Hefei 2300262 Structure Research Laboratory,University of Science and Technology of China,Academia Sinica,Hefei 2300263 International Center for materials Physics,Academia Sinica,Shenyang 1100154 Shanghai Institute of Steel and Iron,Shanghai 200940

Received Date: 1900-01-01
Accepted Date: 1900-01-01
Available Online: 1993-04-05

Abstract: The monoenergetic slow positron beam was first used to study the crystalliation process of metallic glasses.The measurement of Doppler broadening spectra as a function of positron energy was made on the samples of metallic glass Pd_79.5Ni₄Si_16.5 in various states.It is shown that there are a number of the vacancy-like defects in the as-quenched state sample.Its crystallization started at the sample surface.Slow position beam turned out to be an effective probe to study the structural change of metallic glasses.