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Open AccessArticle

Effect of a Traveling Magnetic Field on Micropore Formation in Al-Cu Alloys

1
AVIC Manufacturing Technology Institute, Beijing 100024, China
2
School of Material Science and Engineering, Beihang University, Beijing 100191, China
3
Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
4
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
*
Authors to whom correspondence should be addressed.
Metals 2018, 8(6), 448; https://doi.org/10.3390/met8060448
Received: 14 May 2018 / Revised: 27 May 2018 / Accepted: 5 June 2018 / Published: 12 June 2018
(This article belongs to the Special Issue Casting and Forming of Advanced Aluminum Alloys)
The effect of traveling magnetic fields (TMFs) on the grain and micro-pore formation in an Al alloy was studied by scanning electron microscope and X-ray microtomography in this work. The results show that with the increasing magnetic flux density, the three-dimensional morphology of the micro-pores transformed from dendrite to a relatively equiaxed structure. Quantified results show that both the micro-pore volume fraction and the average grain size of the primary phase decreased as the TMF density increased. The analyses show that the forced convection induced by TMF can break the dendrites, refine the grain size, and promote the liquid feeding, leading to the decrease in the volume fraction of the porosity and improved mechanical property. The TMF performed at different stages during solidification reveal that the maximum effect of TMF on reducing the micro-pore formation was found when TMF was applied in the stage of nucleation and the early stage of grain growth during solidification. View Full-Text
Keywords: aluminum alloy; solidification; X-ray tomography; porosity defects; magnetic field treatment aluminum alloy; solidification; X-ray tomography; porosity defects; magnetic field treatment
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MDPI and ACS Style

Xu, Y.; Wei, L.; Han, B.; Guo, E.; Wang, M.; Su, Y. Effect of a Traveling Magnetic Field on Micropore Formation in Al-Cu Alloys. Metals 2018, 8, 448.

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