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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 320Study on the Medium-Frequency Magnetic Pulse...

Study on the Medium-Frequency Magnetic Pulse Treatment of Fe₅₂Co₃₄Hf₇B₆Cu₁ Amorphous Alloy by Positron Annihilation Technique

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Abstract:

The amorphous alloy specimens Fe₅₂Co₃₄Hf₇B₆Cu₁ were treated by medium-frequency magnetic pulse. The treatment conditions were as follows: the pulsing magnetic field frequency and the acting time were kept at 1500 Hz, 10min, and the field intensity were 200Oe, 250Oe and 300Oe respectively. The structural defects change of specimens after magnetic-pulsing were researched by positron annihilation lifetime technique (PAS). The results show that in the as-quenched amorphous alloy, the positron are mainly localized at vacancy-sized free volumes in the amorphous based phase, and the amorphous alloy produced irreversible structural relaxation after being treated by the medium-frequency magnetic pulse which leaded to the decline of the annihilation lifetime τ₁. With the increase of pulsing magnetic field intensity, new trapping centers of positrons are produced owing to the crystallization of amorphous phase, that leads to the intensity I₂ increases and I₁ decreases drastically. The soft magnetic properties of specimens treated by magnetic-pulsing were tested by vibrating sample magnetometer (VSM). The results show that the medium-frequency magnetic pulse (1500Hz, 200Oe, 10min) can improve the soft magnetic properties of Fe₅₂Co₃₄Hf₇B₆Cu₁amorphous alloy.

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Periodical:

Applied Mechanics and Materials (Volume 320)

Pages:

99-103

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.320.99

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Online since:

May 2013

Authors:

Ying Jin, Yue Sheng Chao, An Du

Keywords:

Fe₅₂Co₃₄Hf₇B₆Cu₁Amorphous Alloy, Medium-Frequency Magnetic Pulse, Positron Annihilation Lifetime, Structural Defect

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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