Effect of Heat Treatment Assisted with Magnetic Field on Microstructure and Magnetic Properties of Co-Ni-Al Alloy

BU Fan; NIE Shuai; LIU Haoxiang; LIU Xudong; HE Yixuan; WANG Jun

Volume 40 Issue 1

Feb. 2025

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Development and Application of Materials > 2025 > 40(1): 1-12.

BU Fan, NIE Shuai, LIU Haoxiang, LIU Xudong, HE Yixuan, WANG Jun. Effect of Heat Treatment Assisted with Magnetic Field on Microstructure and Magnetic Properties of Co-Ni-Al Alloy[J]. Development and Application of Materials, 2025, 40(1): 1-12.

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Effect of Heat Treatment Assisted with Magnetic Field on Microstructure and Magnetic Properties of Co-Ni-Al Alloy

BU Fan^1,2,
NIE Shuai^1,2,
LIU Haoxiang^1,2,
LIU Xudong^1,2,
HE Yixuan^1,2, ,,
WANG Jun¹

1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China;
2. Center of Advanced Lubrication and Seal Materials, Northwestern Polytechnical University, Xi'an 710072, China

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Received Date: October 08, 2024

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Abstract

Abstract

The control of microstructures and properties of magnetic shape memory alloys is one of the important research topics in the field of smart materials. In this study, the Co₃₈Ni₃₃Al₂₉ ternary magnetic shape memory alloys are annealed at 1 100 ℃under different intensities of strong magnetic fields, and the influences of microstructural evolution and magnetic properties of the annealed Co₃₈Ni₃₃Al₂₉ alloys are investigated. Results show that the as-cast alloy presents a hypoeutectic characteristic of β austenite phase as primary dendrites and β+γ lamellar eutectics within the interdendritic regions. The γ secondary phase is rich in Co and Ni solutes, presenting ferromagnetism, while the β phase is in paramagnetic state, rich in Al element. As the magnetic field intensity increases to 3 T, the fraction of the γ phase increases, the γ phase becomes refined, presenting orientation tex- tures along the direction of external magnetic field, and the direction of magnetization tends to be parallel to the magnetic field. The saturation magnetization, magnetic anisotropy coefficient and magneto-strain of alloys also increases. If the magnetic field is further increased to 6 T and 9 T, respectively, the amount of γ phase reduces slightly and the magnetic properties are not altered obviously. This work can provide guidance for further optimization of the microstructure and properties of alloys.
- Co-Ni-Al alloys,
- heat treatment under magnetic field,
- alignment and texture,
- magnetocrystalline anisotropy

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