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Open AccessArticle

Directional Solidification Microstructure of a Ni-Based Superalloy: Influence of a Weak Transverse Magnetic Field

by Xu Li 1, Jun Wang 1,2,*, Jiao Zhang 1, Yanfeng Han 1 and Xi Li 3
1
Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China
2
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
3
School of Material Science and Engineering, Shanghai University, Shanghai 200240, China
*
Author to whom correspondence should be addressed.
Academic Editor: Jordi Sort
Materials 2015, 8(6), 3428-3441; https://doi.org/10.3390/ma8063428
Received: 9 March 2015 / Revised: 29 May 2015 / Accepted: 29 May 2015 / Published: 10 June 2015
(This article belongs to the Section Structure Analysis and Characterization)
A Ni-based superalloy CMSX-6 was directionally solidified at various drawing speeds (5–20 μm·s−1) and diameters (4 mm, 12 mm) under a 0.5 T weak transverse magnetic field. The results show that the application of a weak transverse magnetic field significantly modified the solidification microstructure. It was found that if the drawing speed was lower than 10 μm·s−1, the magnetic field caused extensive macro-segregation in the mushy zone, and a change in the mushy zone length. The magnetic field significantly decreases the size of γ’ and the content of γ-γ’ eutectic. The formation of macro-segregation under a weak magnetic field was attributed to the interdendritic solute transport driven by the thermoelectric magnetic convection (TEMC). The γ’ phase refinement could be attributed to a decrease in nucleation activation energy owing to the magnetic field during solid phase transformation. The change of element segregation is responsible for the content decrease of γ-γ’ eutectic. View Full-Text
Keywords: directional solidification; crystal structure; magnetic fields; segregation directional solidification; crystal structure; magnetic fields; segregation
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Li, X.; Wang, J.; Zhang, J.; Han, Y.; Li, X. Directional Solidification Microstructure of a Ni-Based Superalloy: Influence of a Weak Transverse Magnetic Field. Materials 2015, 8, 3428-3441.

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