Strip Casting of Sm[sub.2]TM[sub.17]-Type Alloys for Production of the Metastable SmTM[sub.7] Phase

Conventional book casting of Sm[sub.2]TM[sub.17]-type alloys (where TM = Co, Fe, Cu, Zr) leads to a coarse, highly segregated microstructure, predominantly due to the slow, variable cooling rate from the mould surface towards the centre of the ingot. These cast alloys require a long homogenisation t...

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Published in:Metals (Basel ) 2024-05, Vol.14 (5)
Main Authors: Sheridan, Richard, Gresle-Farthing, Joseph, Appleby, Alice, Brown, Mangaliso
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description Conventional book casting of Sm[sub.2]TM[sub.17]-type alloys (where TM = Co, Fe, Cu, Zr) leads to a coarse, highly segregated microstructure, predominantly due to the slow, variable cooling rate from the mould surface towards the centre of the ingot. These cast alloys require a long homogenisation treatment to remove this segregation and develop a super-saturated, metastable SmTM[sub.7]-type hexagonal phase. This SmTM[sub.7] phase is a vital precursor phase required during magnet production to develop the complex cellular structure responsible for high magnetic properties. In this work, strip casting was employed to facilitate rapid solidification to develop thin flakes (
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These cast alloys require a long homogenisation treatment to remove this segregation and develop a super-saturated, metastable SmTM[sub.7]-type hexagonal phase. This SmTM[sub.7] phase is a vital precursor phase required during magnet production to develop the complex cellular structure responsible for high magnetic properties. In this work, strip casting was employed to facilitate rapid solidification to develop thin flakes (&lt;0.5 mm thick) with a columnar grain structure. Rapid cooling has the potential to produce a homogenous microstructure consisting predominantly of the metastable SmTM[sub.7] phase. This could remove or significantly reduce the need for the energy-intensive homogenisation treatment usually required in conventional magnet manufacture. This paper investigates the effect of wheel speed (and hence cooling rate) on flake thickness, microstructure, and phase balance of the cast alloys. It was shown that for wheel speeds between 1.1 and 3.0 m/s, the microstructure showed large variation; however, in all cases, evidence of the columnar SmTM[sub.7] phase was presented. The adhesion between the melt and the wheel was deemed to be critical for the nucleation and subsequent columnar growth of SmTM[sub.7] grains, where the wheel speed controlled both the flow of the alloy onto the wheel and the thickness of the resultant flake. 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It was shown that for wheel speeds between 1.1 and 3.0 m/s, the microstructure showed large variation; however, in all cases, evidence of the columnar SmTM[sub.7] phase was presented. The adhesion between the melt and the wheel was deemed to be critical for the nucleation and subsequent columnar growth of SmTM[sub.7] grains, where the wheel speed controlled both the flow of the alloy onto the wheel and the thickness of the resultant flake. It was determined that in order to achieve a homogenous columnar SmTM[sub.7] structure, the maximum flake thickness should be limited to 270 μm to avoid the formation of equiaxed Sm[sub.2]TM[sub.17] grains through insufficient cooling.</abstract><pub>MDPI AG</pub><doi>10.3390/met14050517</doi></addata></record>
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Structure
title Strip Casting of Sm[sub.2]TM[sub.17]-Type Alloys for Production of the Metastable SmTM[sub.7] Phase
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