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永磁場對金合金二次枝晶臂間距和析出相的影響
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東北大學(xué),東北大學(xué)

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國家自然科學(xué)基金項目（面上項目，重點項目，重大項目）


Effects of Permanent Magnetic Field on Secondary Dendrite Arm Spacing and Precipitate of Gold Alloy
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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    將旋轉(zhuǎn)永磁場應(yīng)用于金合金的制備過程中，研究不同轉(zhuǎn)速永磁場對金合金二次枝晶臂間距和析出相的影響規(guī)律，同時探討其機理。結(jié)果表明：旋轉(zhuǎn)永磁場可以使金合金凝固組織明顯細化，顯著降低了合金的二次枝晶臂間距，但過高的永磁體轉(zhuǎn)速使合金熔體的集膚效應(yīng)顯著增大，減小了永磁場的作用范圍，使熔體心部磁感應(yīng)強度減小，二次枝晶臂間距反而增大。對金合金施加永磁場提高了枝晶間富金相的面積分數(shù)，300r/min時金合金富金相含量最多，為5.07%，比未施加永磁攪拌的金合金高出近59.4%。

    Abstract:

    In this work, the permanent magnetic field was applied to prepare gold alloy and the influences of permanent magnetic field on secondary dendrite arm spacing and precipitate of gold alloy was also discussed. The results show that the rotating magnetic field remarkably refined the microstructure and reduced secondary dendrite arm space of gold alloy. However, a too high rotating speed can increase the skin effect of the molten metal and lower the magnetic flux density of the centre, thereby increasing secondary dendrite arm space. The area fractions of α2 can be increased by rotating magnetic field. At 300r/min, the gold alloy had the highest area fractions of α2, which was 59.4% higher than without permanent magnetic field.

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張俊凱,厲英.永磁場對金合金二次枝晶臂間距和析出相的影響[J].稀有金屬材料與工程,2018,47(9):2857~2860.[zhangjunkai, liying. Effects of Permanent Magnetic Field on Secondary Dendrite Arm Spacing and Precipitate of Gold Alloy[J]. Rare Metal Materials and Engineering,2018,47(9):2857~2860.]
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  • 收稿日期:2016-11-13
  • 最后修改日期:2017-01-05
  • 錄用日期:2017-03-16
  • 在線發(fā)布日期: 2018-11-01
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