Changes of Magnetic Properties and Microstructure of NdFeB Ternary System Alloys during Annealing Process
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摘要: 本文研究了NdFeB三元系永磁合金在恒溫(773~1023K)回火過程中組織結構與性能的變化。實驗結果表明:在回火初期(1~3min)矯頑力較快地提高,達到峰值后矯頑力又降低。回火溫度越低,矯頑力達到峰值所需的時間越長,與燒結態相比,回火后矯頑力可提高1倍。回火前后合金的基體相沒有變化,都是單相的,沒有缺陷。回火過程僅是晶界,特別是晶界交隅處發生晶化與共晶轉變。回火后矯頑力的提高與晶界的變化有關。Abstract: Under temperatures (773~1023K), the results show that in early stage of annealing the coercivity increases sharply and after a peak value, it decrease again. The coercivity for the specimens under annealing state was enhanced one time compared with that of the sintered state. The matrix phase was single phase, in which no crystalline defect was found and the matrix phase was unchanged, only the grain boundaries change. The increase of the coercivity ofter annealing was connected with the changes of grain boundaries.
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Key words:
- rare earth magnet /
- microstructure /
- coercive torce
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