Effect of Heat Treatment Assisted with Magnetic Field on Microstructure and Magnetic Properties of Co-Ni-Al Alloy
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摘要: 磁控形状记忆合金的组织性能调控是智能材料领域的重要研究课题之一。本研究以Co38Ni33Al29磁控形状记忆合金为研究对象,探究了在不同磁场强度下热处理对合金微观组织演化及磁性能的影响规律与机制。结果表明,铸态合金呈现出初生枝晶为β奥氏体相,枝晶间为β+γ共晶组织的亚共晶形貌特征,γ相富含Co和Ni元素,呈现强磁性,β相富含Al元素,呈现弱磁性。经3 T磁场热处理后,γ相体积分数增加,尺寸细化,沿磁场方向产生取向织构特征,且其易磁化方向趋于平行磁场。同时,合金整体的饱和磁化强度提高,磁各向异性常数增加,磁致应变量增加。当磁场强度进一步增加至6 T和9 T时,γ相体积分数略微降低,合金整体磁性能仍保持稳定。本研究可为进一步优化Co-Ni-Al系形状记忆合金组织性能提供新的思路及方法。
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关键词:
- Co-Ni-Al合金 /
- 强磁场热处理 /
- 织构 /
- 磁各向异性
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. -
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