Solidification of Al Alloys Under Electromagnetic Pulses and Characterization of the 3D Microstructures Using Synchrotron X-ray Tomography
Solidification of Al Alloys Under Electromagnetic Pulses and Characterization of the 3D Microstructures Using Synchrotron X-ray Tomography
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DOI：
10.1007/s11661-015-2874-8
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发表时间：
2015-07-01
影响因子：
2.8
通讯作者：
Mi, Jiawei
中科院分区：
文献类型：
--
作者：
Manuwong, Theerapatt;Zhang, Wei;Mi, Jiawei
开发了一种新型可编程电磁脉冲装置，并用于研究 Al-15 pct Cu 和 Al-35 pct Cu 合金的凝固。使用有限元方法模拟凝固熔体内部产生的脉冲磁通量和洛伦兹力，并使用电子显微镜和同步加速器X射线断层扫描表征它们对凝固微观结构的影响。使用 120 V 的放电电压，在凝固的 Al-Cu 熔体内部产生峰值洛伦兹力类似于 1.6 N 的脉冲磁场，该磁场足以破坏初生 Al 枝晶和 Al2Cu 金属间相的生长。微观结构与所施加脉冲的特性表现出很强的相关性，形成与所施加电磁场的频率共振的周期性图案。
A novel programmable electromagnetic pulse device was developed and used to study the solidification of Al-15 pct Cu and Al-35 pct Cu alloys. The pulsed magnetic fluxes and Lorentz forces generated inside the solidifying melts were simulated using finite element methods, and their effects on the solidification microstructures were characterized using electron microscopy and synchrotron X-ray tomography. Using a discharging voltage of 120 V, a pulsed magnetic field with the peak Lorentz force of similar to 1.6 N was generated inside the solidifying Al-Cu melts which were showed sufficiently enough to disrupt the growth of the primary Al dendrites and the Al2Cu intermetallic phases. The microstructures exhibit a strong correlation to the characteristics of the applied pulse, forming a periodical pattern that resonates the frequency of the applied electromagnetic field.