金属学报  1987, Vol. 23 Issue (1): 95-98

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Nd-Fe-B磁体的热膨胀和硬度随温度的变化

罗阳;张宁

冶金工业部钢铁研究总院;冶金工业部钢铁研究总院

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)

罗阳;张宁. Nd-Fe-B磁体的热膨胀和硬度随温度的变化[J]. 金属学报, 1987, 23(1): 95-98.
, . TEMPERATURE DEPENDENCE ON HARDNESS AND EXPANSION OF SINTERED Nd-Fe-B MAGNETS[J]. Acta Metall Sin, 1987, 23(1): 95-98.

摘要 参考文献 相关文章 Metrics 全文: PDF(982 KB)   摘要: <正> Nd-Fe-B 合金,除用粉末冶金方法制备外,也用快淬、热压工艺制成具有优异性能的各向异性永磁体.实验表明,快淬 Nd-Fe-B合金的热压致密体于700℃下模压,若断面收缩达50%,则 Nd_2Fe_(14)B 基相的微晶因其 C 轴平行于压制方向而具有强的择优取向.显然,高温模压是用快淬合金制备高性能磁体的关键工艺,应变诱导晶粒长大和晶粒取向均在高温模压过程中完成.为探索快淬、热压磁体各向异性的成因,进而确定最佳热压工艺,有必要研究合金机械性 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. 收稿日期: 1987-01-18      服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 罗阳 张宁 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1987/V23/I1/95 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 No related articles found! Viewed Full text Abstract Cited   Shared      Discussed