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| EFFECTS OF AS-CAST CRYSTALLINE STRUCTURE AND Cu SEGREGATION ON COERCIVITY OF Sm (Co, Cu, Fe, Mn)_(7.8) PERMANENT MAGNET |
| JIANG Jingkai; XIAO Lianfang; WANG Jiahai (Baotou Research Institute of Metallurgy) |
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Cite this article:
JIANG Jingkai; XIAO Lianfang; WANG Jiahai (Baotou Research Institute of Metallurgy). EFFECTS OF AS-CAST CRYSTALLINE STRUCTURE AND Cu SEGREGATION ON COERCIVITY OF Sm (Co, Cu, Fe, Mn)_(7.8) PERMANENT MAGNET. Acta Metall Sin, 1983, 19(5): 65-154.
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Abstract Effects of the as-cast crystaline structure and segregation in Cu on the coercivity of Sm(Co, Cu, Fe, Mn)_(7.8) permanent magnets have been investigated. Experimental results showed that the crystalline structure of the ingot is different with different cooling rates. In the equi-axed grain structure, the inner of the grain is deficient in Cu; free Cu concentrates on the grain boundaries, where an amount of high temperature phase of hexagonal structure of Sm_2Co_(17-x)T_x is preserved, resulting in a decrease in the coercivity. In the fine-columnar grain structure, no serious segregation in composition has been observed. Magnets after sintering and solution treatment exhibit the cellular microstructure; precipitated Cu and SmCo_(5-x)T_x phase rich in Cu disperse on the cell-wall. They probably play, in the course of magnetization reversal, the role of pinning the domain wall, hence, giving high coercivity.
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Received: 18 May 1983
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7 杨应昌;何文旺;林勤,待发表.
8 金子秀夫,日本金属学会会报,2 (1976) ,109． |
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