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| TEMPERATURE DEPENDENCE ON HARDNESS AND EXPANSION OF SINTERED Nd-Fe-B MAGNETS |
| LUO Yang ZHANG Ning (Central Iron and Steel Research Institute Ministry of Metallurgical Industry;Beijing) |
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Cite this article:
LUO Yang ZHANG Ning (Central Iron and Steel Research Institute Ministry of Metallurgical Industry;Beijing). TEMPERATURE DEPENDENCE ON HARDNESS AND EXPANSION OF SINTERED Nd-Fe-B MAGNETS. Acta Metall Sin, 1987, 23(1): 95-98.
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Abstract A singular point is indicated at Curie temperature on the curve of expansion measurea either parallel or perpendicular to C-axis of the sintered Nd_(15)Fe_(79)B_6 magnet in the range from room temperature to 700℃.Remarkable difference in shape and slope of the curve on both sides separated bY the singular point is noticed:at temperature over T_c,it expands normally in heating;but below T_c,an abnormal shrinkage,especially in the direction per- pendicular to C-axis,is revealed.This implicates the effect of ferromagnetism upon the thermal expanion.The temperature dependence on hardness of the sintered magnet Nd_(15)Fe_(78) B_7,measured in the range from room temperature to 750℃ is shown as:at T>300>,its hardness decreases very sharply;till 450℃,decreases about 50% and it is reduced to almost one order of magnitude while T>650℃ at which the alloy is softened.The existance of such plastic flow demonstrates the possibility of strain induced anisotropy during hot pre- ssing.
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Received: 18 January 1987
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1 Sagawa M,Fujimura S,Togawa H,Yamamoto H,Matsunra Y.J Appl Phys,1984;55:2083,
2 Lee R W,et al.IEEE Trans.Magn.1985;MAG-21;1958
3 罗阳,张宁,苏秀锦。金属学报,待发表
4 Fidler J,Luo Yang.Id:Strnat K.ed,Proc 8th Int Workshop on Rare-Earth Magnets,University of Dayton USA,1985;647 |
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