Mechanisms of producing anisotropy in NdFeB material during HDDR process
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摘要: 研究了NdFeB鑄態粉末及HDDR工藝處理過程中不同階段材料的顯微結構、磁性能和各向異性產生的機理.發現NdFeB鑄態粉末的各向異性均大于HDDR NdFeB材料的各向異性.隨歧化時間延長HDDR NdFeB材料的各向異性單調下降,最終消失,說明HDDR NdFeB材料的各向異性來源于對鑄態粉末各向異性的繼承;短時間的歧化處理有助于材料獲得各向異性;柱狀歧化組織作為各向異性的傳遞介質,以位向關系的方式,將各向異性由鑄態粉末傳遞到了經HDDR處理后的NdFeB粉末.Abstract: The microstructure, magnetic property and anisotropic mechanism of NdFeB as-cast powder and the material in different HDDR treatment stages were investigated. It is found that the anisotropy of NdFeB as-cast powder is greater than that of HDDR NdFeB materiacs. The anisotropy of HDDR NdFeB material decreases monotonously and finally disappears with the disproportionation time prolonging, which means that the anisotropy of HDDR NdFeB material originates from as-cast texture. Short disproportionation time is helpful for the anisotropy attainment. As an anisotropy passing medium, the disproportionation lamella microstructure transfers the anisotropy of as-cast powder to the final HDDR NdFeB material by means of crystallographic orientation.
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Key words:
- NdFeB /
- HDDR /
- anisotropy /
- disproportionation treatment
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