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Amorphous Fe43Co43Hf7B6Cu1 alloy prepared by melt-spun technique were annealed at temperature 200 ℃, 300 ℃, 400 ℃ and 500 ℃ for 30 min. The structure and structural defects in annealed specimens were investigated by positron annihilation lifetime spectra, X-ray diffraction (XRD) and Mssbauer spectroscopy (MS), etc. . The results show that in the as-quenched amorphous alloy, more than 85% of the positrons are localized at vacancy-sized free volumes in the amorphous based phase, annihilation lifetime τ1=158.4 ps, and the other 11.9% of positrons are trapped by microvoids, with lifetime τ2=397 ps. After annealing at temperature 200 ℃, 300 ℃ and 400 ℃ for 30 min, the atomic short range diffusion will give rise to the migration and annihilation of vacancy-like defects. The major component τ1 will be reduced continuously. The value of τ1 will decrease to 149 ps at 400 ℃, their relative intensities I1 decreases and reaches 80.8%. Meanwhile the annihilation lifetime of positrons in the microvoids τ2 will change from 353 ps to 364 ps, their relative intensities I2 are increased to 18.0%. When annealed at temperature 500 ℃ for 30 min, new trapping centers of positrons are produced owing to the crystallization of amorphous phase, I2 increases drastically to 26.7%.
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Keywords:
- Fe43Co43Hf7B6Cu1 amorphous /
- annealing treatment /
- positron annihilation lifetime /
- structure and structural defects
[1] Majumdar B, Bysak S, Akhtar D 2007 J. Magn. Mag. Mat. 309 300
[2] Kulik T, Ferenc J, Kolano-Burian A, Liang X B, Xu B S 2007 J.Alloy Comp.434-435 623
[3] Liang X B, Kulik T, Ferenc J, Erenc-Sedziak T, Xu B S, Grabias A, Kopcewicz M 2007 Mat. Charact. 58 143
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[6] Lu W, Yang L, Yan B, Huang W H 2005 Mater. Sci. Eng. B 128 179
[7] Kri Asˇ tiaková K, vec P, Kri Asˇ tiak J, Duhaj P, au Asˇ a O 1997 Mater. Sci. Eng. A 226-228 321
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[9] Würschum R, Greiner W, Schaefer H E 1993 Nano. Mat. 2 55
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[13] Sato K, Murakami H, Kobayashi Y, Sprengel W, Schaefer H E 2007 J. Non-Cryst. Solids 353 1882
[14] Sitek J, Degmová J, Sedla Acˇ ková K, Butvin P 2006 J. Magn. Mag. Mat. 304 e697
[15] Chao Y S, Zhu H X, Li Z M, Zhang Y H, Zou Z H 2009 J. Physics 188 012038
[16] Liang X B, Kulik T, Ferenc J, Kowalczyk M, Vlasak G, Sun W S, Xu B S 2005 Physica B 370 151
[17] Chao Y S, Li M Y, Geng Y, Liu J G 2004 Acta Phys. Sin. 53 3453 (in Chinese) [晁月盛、李明扬、耿 岩、刘吉刚 2004 物理学报 53 3453]
[18] Chao Y S, Zhang Y H, Guo H, Zhang L, Wang X G 2007 Acta Metal. Sin. 43 231 (in Chinese) [晁月盛、张艳辉、郭 红、张 莉、王兴刚 2007 金属学报 43 231]
[19] Blazquez J S, Franco V, Conde C F, Conde A, Ferenc J, Kulik T 2007 J. Non-cryst. Solids 353 872
[20] Han M G, Ou Y, Liang D F, Deng L J 2009 Chin. Phys. B 18 1261
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[1] Majumdar B, Bysak S, Akhtar D 2007 J. Magn. Mag. Mat. 309 300
[2] Kulik T, Ferenc J, Kolano-Burian A, Liang X B, Xu B S 2007 J.Alloy Comp.434-435 623
[3] Liang X B, Kulik T, Ferenc J, Erenc-Sedziak T, Xu B S, Grabias A, Kopcewicz M 2007 Mat. Charact. 58 143
[4] Yu W Z 2003 Positron physics and its applications (Beijing: Science Press) p248—269 (in Chinese) [郁伟中 2003 正电子 物理及其应用(北京:科学出版社)第248—269页] 〖5] Sato K, Shanai D, Hotani Y, Ougizawa, Ito K, Hirato K, Kobayashi Y 2006 Phys Rev. Lett. 96 228302
[5] Sato K, Baier F, Sprengel W, Würschum R, Schaefer H E 2004 Phys Rev. Lett. 92 127403
[6] Lu W, Yang L, Yan B, Huang W H 2005 Mater. Sci. Eng. B 128 179
[7] Kri Asˇ tiaková K, vec P, Kri Asˇ tiak J, Duhaj P, au Asˇ a O 1997 Mater. Sci. Eng. A 226-228 321
[8] Bernal M J, Cruz R M, Leguey T, Pareja R, Riveiro J H 1995 J. Non-cryst. Solids 180 164
[9] Würschum R, Greiner W, Schaefer H E 1993 Nano. Mat. 2 55
[10] Tong H Y, Ding B Z, Jiang H G, Wang J T, Lu K 1992 J. Appl. Phys. 72 5124
[11] Guo Y C, Wang Z X 1984 The Physics of Noncrystal State (Beijing: Science Press) p175 (in Chinese) [郭贻诚、王震西 1984非晶态物理学(北京:科学出版社)第175页]
[12] Liu X D 1998 Mater. Trans. JIM 39 783
[13] Sato K, Murakami H, Kobayashi Y, Sprengel W, Schaefer H E 2007 J. Non-Cryst. Solids 353 1882
[14] Sitek J, Degmová J, Sedla Acˇ ková K, Butvin P 2006 J. Magn. Mag. Mat. 304 e697
[15] Chao Y S, Zhu H X, Li Z M, Zhang Y H, Zou Z H 2009 J. Physics 188 012038
[16] Liang X B, Kulik T, Ferenc J, Kowalczyk M, Vlasak G, Sun W S, Xu B S 2005 Physica B 370 151
[17] Chao Y S, Li M Y, Geng Y, Liu J G 2004 Acta Phys. Sin. 53 3453 (in Chinese) [晁月盛、李明扬、耿 岩、刘吉刚 2004 物理学报 53 3453]
[18] Chao Y S, Zhang Y H, Guo H, Zhang L, Wang X G 2007 Acta Metal. Sin. 43 231 (in Chinese) [晁月盛、张艳辉、郭 红、张 莉、王兴刚 2007 金属学报 43 231]
[19] Blazquez J S, Franco V, Conde C F, Conde A, Ferenc J, Kulik T 2007 J. Non-cryst. Solids 353 872
[20] Han M G, Ou Y, Liang D F, Deng L J 2009 Chin. Phys. B 18 1261
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