Abstract
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 ~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.
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Acknowledgment
We would like to acknowledge Diamond Light Source for the award of synchrotron X-ray beam time on Beamline I13-2 under the proposal No. MT9974. The financial supports for this research from the Royal Thai Government PhD Studentship (for T. Manuwong), the joint University of Hull and Chinese Scholarship Council (UoH-CSC) PhD studentship (for W. Zhang), and the Royal Society Industry Fellowship (for J. Mi) are also gratefully acknowledged.
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Manuscript submitted February 1, 2015.
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Manuwong, T., Zhang, W., Kazinczi, P.L. et al. Solidification of Al Alloys Under Electromagnetic Pulses and Characterization of the 3D Microstructures Using Synchrotron X-ray Tomography. Metall Mater Trans A 46, 2908–2915 (2015). https://doi.org/10.1007/s11661-015-2874-8
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DOI: https://doi.org/10.1007/s11661-015-2874-8