• Title/Summary/Keyword: Fe-Si Alloy

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Magnetic Annealing of Amorphous Fe-B-Si Alloy (Fe-B-Si 비정질 합금의 자장중 열처리 효과)

  • Kang, Won-Koo;Kim, Yoon-Dong;Lee, Eun-Yong;Kim, Ki-Uk;Lee, Won-Jae;Min, Bok-Ki;Song, Jae-Sung;Hong, Jin-Wan;Yoon, Moon-Soo
    • Proceedings of the KIEE Conference
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    • 1990.07a
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    • pp.236-238
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    • 1990

  • For improving magnetic properties of the amorphous Fe-B-Si alloy, we annealed in a magnetic field oriented in the plane of the ribbon longitudinal to its long axis. By field annealing, coercive force and total core loss are reduced from 0.04 Oe to 0.02 Oe, and from 0.25 watt/kg to 0.15 watt/kg respectively comparing with non-field annealed specimen. These reductions were caused by the formation of $180^{\circ}$ domains parallel to the annealing field due to the induced anisotorpy.

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High Temperature Fatigue Deformation Behavior of Automotive Heat Resistant Aluminum Alloys (자동차 부품용 내열 알루미늄 합금의 고온 피로 변형 거동)

  • Park, Jong-Soo;Sung, Si-Young;Han, Bum-Suck;Jung, Chang-Yeol;Lee, Kee-Ahn
    • Korean Journal of Metals and Materials
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    • v.48 no.1
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    • pp.28-38
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    • 2010

  • High temperature high cycle and low cycle fatigue deformation behavior of automotive heat resistant aluminum alloys (A356 and A319 based) were investigated in this study. The microstructures of both alloys were composed of primary Al-Si dendrite and eutectic Si phase. However, the size and distribution for eutectic Si phase varied: a coarse and inhomogeneous distributed was observed in alloy B (A319 based). A brittle intermethallic phase of ${\alpha}-Fe\;Al_{12}(Fe,Mn)_3Si_2$ was detected only in B alloy. Alloy B exhibited high fatigue life only under a high stress amplitued condition in the high cycle fatigue results, whereas alloy A showed high fatigue life when stress was lowered. With regard to the low-cycle fatigue result ($250^{\circ}C$) showing higher fatigue life as ductility increased, alloy A demonstrated higher fatigue life under all of the strain amplitude conditions. Fractographic observations showed that large porosities and pores near the outside surface could be the main factor in the formation of fatigue cracks. In alloy B. micro-cracks were formed in both the brittle intermetallic and coarse Si phasese. These micro-cracks then coalesced together and provided a path for fatigue crack propagation. From the observation of the differences in microstructure and fractography of these two automotive alloys, the authors attempt to explain the high-temperature fatigue deformation behavior of heat resistant aluminum alloys.

  • https://doi.org/10.3365.KJMM.2010.48.01.028 인용 KSCI

MAGNETIC PROPERTIES OF GRANULAR Fe-SiO FILMS

  • Furubayashi, Takao;Nakatani, Isao
    • Journal of the Korean Magnetics Society
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    • v.5 no.5
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    • pp.474-477
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    • 1995

  • Granular Fe-SiO films were prepared by co-evaporating in a vacuum. Magnetic properties of the films were investigated by $M\"{o}ssbauer$ and magnetization measurments. The $M\"{o}ssbauer$ data suggest that the films consist of amorphous Fe-Si alloy particles with the size of nanometers. Superparamagnetic magnetization curves were well reproduced by considering the distribution of particle size and the magnetic dipole interaction between particles as the mean field.

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