Application of differential thermal analysis to investigation of magnetic field effect on solidification of Al–Cu hypereutectic alloy
Application of differential thermal analysis to investigation of magnetic field effect on solidification of Al–Cu hypereutectic alloy
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DOI：
10.1016/j.jallcom.2010.06.056
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发表时间：
2010-08
影响因子：
6.2
通讯作者：
Chuanjun Li;H. Yang;Z. Ren;W. Ren;Yuqin Wu
中科院分区：
文献类型：
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作者：
Chuanjun Li;H. Yang;Z. Ren;W. Ren;Yuqin Wu
Al-25 at.%合金的凝固研究用差热分析法研究了铜过氧化氢合金在磁场中的热行为.差热分析结果表明，与无磁场时相比，在6 T和12 T磁场下，合金的熔化几乎不受影响，但初生Al 2Cu相和Al-Al 2Cu共晶的形核温度降低，包括初生相和共晶在内的晶体生长速率减慢。对初生相和共晶形核和生长的抑制主要是由于在抑制对流的条件下，磁场中原子的扩散速率降低。与无磁场时的无序相相比，初生Al 2Cu相沿磁场方向沿着取向，这是由磁各向异性引起的。
Investigation of solidification in the Al–25at.%Cu hypereutectic alloy in magnetic fields has been carried out by differential thermal analysis (DTA). The DTA results indicated that the nucleation temperatures of primary Al2Cu phases and Al–Al2Cu eutectics were lowered and the rates of crystal growth including primary phases and eutectics were reduced although the melting of the alloy was almost not affected in magnetic fields of 6T and 12T in comparison with those without a magnetic field. The suppression of nucleation and growth of primary phases and eutectics might be mainly attributed to reduction of diffusion rates of atoms in a magnetic field on the condition of suppression of convections. Primary Al2Cu phases oriented along a magnetic field compared with disorder ones without a magnetic field, which was caused by the magnetic anisotropy.