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磁性材料在磁場(chǎng)中凝固取向的臨界條件研究
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TG111.4

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國(guó)家自然科學(xué)基金（50125101）資助


Study on Critical Conditions of Orientation for Magnetic Materials Solidified in a Magnetic Field
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    摘要:

    抑制凝固過(guò)程中熔體內(nèi)部的湍流是獲得沿易軸取向晶體組織的關(guān)鍵。在凝固過(guò)程中，熔體內(nèi)部的對(duì)流狀態(tài)主要受冷卻速率影響，修正的瑞利數(shù)被用來(lái)描述不同冷卻速率下的熔體湍流程度。當(dāng)反映熔體紊亂程度的瑞利數(shù)小于磁場(chǎng)作用下的臨界瑞利數(shù)時(shí)，熔體的內(nèi)部擾動(dòng)被磁場(chǎng)抑制，生長(zhǎng)中的晶體將克服熱無(wú)序作用平行于磁場(chǎng)沿易磁化軸取向。修正的瑞利數(shù)和臨界瑞利數(shù)接近時(shí)的凝固和磁場(chǎng)參數(shù)可作為磁性材料晶體生長(zhǎng)取向控制的臨界條件。

    Abstract:

    The critical conditions of solidification orientation for Solidification of giant magnetostrictive materials R-Fe alloy in a magnetic field have been investigated. The experiment results show that suppressing the turbulence in melt is a key factor in texturing the magnetic materials. In solidification course, the turbulent degree in melt is dominated by the cooling rate, and a modified Ra^m number is used to simulate the state of turbulence at various cooling rates. While the value of the critical Ra^c number in magnetic field is large than that of the modified Ra^m number in melt, the temperature oscillations in melt will be restrained, and the texture along the easy magnetic axis will be dominant in the sample. Therefore the critical conditions of effective orienting action for magnetic materials by solidification in a magnetic field can be definite as the rate of the critical Ra^c number in a magnetic field to Ra^m number in melt is close to 1.

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鄧沛然 李建國(guó).磁性材料在磁場(chǎng)中凝固取向的臨界條件研究[J].稀有金屬材料與工程,2006,35(11):1700~1703.[Deng Peiran, Li Jianguo. Study on Critical Conditions of Orientation for Magnetic Materials Solidified in a Magnetic Field[J]. Rare Metal Materials and Engineering,2006,35(11):1700~1703.]
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  • 收稿日期:2006-02-27
  • 最后修改日期:2006-02-27
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