An improved approach to calibrating high magnetic field gradients for pulsed field gradient experiments

We investigated how high magnetic field gradients affected the magnetostrictive performance of Tb[Formula: see text]Dy[Formula: see text]Fe[Formula: see text] during solidification. At high applied magnetic field gradients, the magnetostriction exhibited a gradient distribution throughout the alloy. Increasing the magnetic field gradient also increased the magnetostriction gradient. We attributed the graded magnetostrictive performance to the gradient distribution of (Tb, Dy)Fe2 phase in the alloy and its orientation.

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Alignment of Primary Al3Ni Phases in Hypereutectic Al-Ni Alloys with Various Compositions under High Magnetic Field Gradients

Materials Science Forum ◽

10.4028/www.scientific.net/msf.649.165 ◽

2010 ◽

Vol 649 ◽

pp. 165-169 ◽

Cited By ~ 1

Author(s):

Tie Liu ◽

Qiang Wang ◽

Zhong Ying Wang ◽

Dong Gang Li ◽

Ji Cheng He

Keyword(s):

Magnetic Field ◽

Field Gradient ◽

High Magnetic Field ◽

Uniform Magnetic Field ◽

Alloy Composition ◽

Magnetic Field Gradient ◽

Obvious Effect ◽

Ni Alloys ◽

Field Gradients ◽

Magnetic Field Gradients

The microstructural changes of the primary Al3Ni phases in hypereutectic Al-Ni alloys solidified under various high magnetic field gradients were investigated. It was found that the application of a magnetic field gradient induced an aligned structure of the primary Al3Ni phases similar to those in a high uniform magnetic field. However, the high magnetic field gradient showed more obvious effect on the alignment of the primary Al3Ni phases than the uniform magnetic field, although this effect strongly depended on the alloy composition.

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Distribution of alloying elements and the corresponding structural evolution of Mn–Sb alloys in high magnetic field gradients

Journal of Materials Research ◽

10.1557/jmr.2010.0226 ◽

2010 ◽

Vol 25 (9) ◽

pp. 1718-1727 ◽

Cited By ~ 24

Author(s):

Tie Liu ◽

Qiang Wang ◽

Ao Gao ◽

Hongwei Zhang ◽

Kai Wang ◽

...

Keyword(s):

Magnetic Field ◽

Field Gradient ◽

High Magnetic Field ◽

Magnetic Field Gradient ◽

Structural Evolution ◽

Alloying Elements ◽

Continuous Change ◽

Solute Element ◽

Field Gradients ◽

Magnetic Field Gradients

The distribution of alloying elements and the corresponding structural evolution of Mn–Sb alloys in magnetic field gradients were investigated in detail. It was found that a high magnetic field gradient could control the distribution of solute element in the alloys during the solidification process and therefore resulted in the coexistence of both primary MnSb and Sb phases or the aggregation of the primary MnSb with a continuous change in morphology. The positions where these primary phases located depended on the direction of field gradient. The control of the solute element distribution by a high magnetic field gradient was realized through the magnetic buoyancy force that could drive the migration of Mn element in the melt, originating from the difference in the magnetic susceptibility between Mn and Sb. The effectiveness of this control depends on the alloy composition, specimen dimension, cooling rate, and |BdB/dz| value.

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