Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第15卷    第3期    总第72期    2005年3月

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文章编号: 1004-0609(2005)03-0397-07
强磁场对Bi-Mn合金355℃包晶相变点的影响
李 喜, 任忠鸣, 高 云, 邓 康, 壮云乾, 徐匡迪

(上海大学 材料科学与工程学院, 上海 200072)

摘 要: 根据物质在梯度磁场中的受力与其磁性相关的原理, 提出了通过测定合金在磁场中的受力来了解其相变的方法。 根据该方法, 对Bi-Mn合金在不同磁场强度下包晶相变点进行了测定, 并从热力学上分析了强磁场对相变点的影响。 结果发现: 随磁场强度的提高, 合金的包晶相变点逐渐提高, 在10 T磁场下, 相变点提高20 ℃左右。 同时, 强磁场的施加促进了MnBi相的形态由块状向片状的转变。

 

关键字:  强磁场; 包晶相变; Bi-Mn合金; 磁化; 磁力

Effect of high magnetic field on peritectic reaction in Bi-Mn alloys at 355℃
LI Xi, REN Zhong-ming, GAO Yun,
DENG Kang, ZHUANG Yun-qian, XU Kuang-di

School of Materials Science and Engineering, Shanghai University,
 Shanghai 200072, China

Abstract: Based on the relationship between the magnetization force of substance in a gradient magnetic field and its magnetic permeability, a method to detect phase transformation of metal by means of measuring the force was proposed. By this method, the 355 ℃ peritectic transformation of Bi-Mn alloys in a high magnetic field was measured, and thermodynamics analysis was carried out to investigate the influence of the magnetic field on the phase transformation. It is found that with the increasing magnetic field the transformation temperature increases significantly, and with 10 T field the increasement of the temperature reaches 20 ℃. The high magnetic field promotes the transformation of the morphology of the MnBi phase from cubic to flake.

 

Key words: high magnetic field; peritectic transformation; Bi-Mn alloy; magnetization; magnetic force

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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