Investigation of positron annihilation in Fe52Co34Hf7B6Cu1 amorphous alloy treated by intermediate frequency magnetic pulse

Zhang Yan-Hui; Li Yan-Long; Gu Yue; Chao Yue-Sheng

doi:10.7498/aps.61.167502

Abstract

The effect of intermediate frequency magnetic pulse treatments on Fe52Co34Hf7B6Cu1 amorphous alloy prepared by melt-spun technique is investigated. The microstructure and structural defects of the treated specimens are investigated by TEM, Mössbauer spectroscopy and position annihilation lifetime spectra. The results show that the treated specimens by intermediate frequency magnetic pulse are partially crystallized, the content of the crystallization phase increases with the increase of the magnetic pulse frequency, and the crystalline volume fraction is 33.1% at a frequency of 2000 Hz. For the as-quenched amorphous alloy, the annihilation lifetime τ1 is 150.5 ps in the monovacancy-like free volume, and the relative intensity I1 is 77.7%. The annihilation lifetime τ2 is 349.7 ps in the microvoid, and the relative intensity I2 is 22.3%. With the increase of the magnetic pulse frequency, the values of τ1 and τ2 of the treated specimens decrease, I1 increases, I2 and τ decrease compared with the as-quenched amorphous alloy.

Keywords:

Authors and contacts

1.
College of Science, Northeastern University, Shenyang 110004, China;
2.
College of Science, University of Science and Technology Liaoning, Anshan 114044, China
Funds: Project supported by the National Natural Science Foundation of China (Grant No. 50771025) and the Start-up Fund for Dcotors of Liaoning Province, China (Grant No. 201120010).

References

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Cited By

[1]	Lucas M S, Bourne W C, Sheets A O, Brunke L, Alexander M D, Shank J M, Michel E, Semiatin S L, Horwath J, Turgut Z 2011 Mater. Sci. Eng. B 176 1079
[2]	Turgut Z, Christy L, Huang M, Horwath J C 2010 J. Appl. Phys. 107 09A327
[3]	Liang X B, Kulik T, Ferenc J, Erenc-Sedziak T, Xu B S, Grabias A, Kopcewicz M 2007 Mater. Character. 58 143
[4]	Chao Y S, Guo H, Gao X Y, Luo L P, Zhu H X 2011 Acta Phys. Sin. 60 017504 (in Chinese) [晁月盛,郭红,高翔宇,罗丽平,朱涵娴 2011 物理学报 60 017504]
[5]	Kulik T, Ferenc J, Kowalczyk M 2005 J. Mater. Process. Tech. 162-163 215
[6]	Liang X B, Kulik T, Feren J, Kowalczyk M, Vlasák G, Sun W S, Xu B S 2005 Physica B 370 151
[7]	Liang X B, Ferenc J, Kulik T, Anna S W, Xu B S 2004 J. Magn. Magn. Mater. 284 86
[8]	Zhong W D 1987 Ferromagnetism (Vol. 2) (Beijing: Science Press) (in Chinese) [钟文定 1987 铁磁学(中册)(北京:科学出版社)]
[9]	Liu T, Zhao Z T, Ma R Z, Guo Y H, Chao H M, Wang Y Y 1995 Nucl. Sci. Tech. 18 28
[10]	Yu W Z 1998 College Phys. 17 23

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Vol. 61, Issue 16 - 2012-08-20

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