【摘要】 研究了热处理工艺对<110>轴向取向Tb0.3Dy0.7(Fe1-xMx)1.95(M=Mn,Al,Ti,B,x=0.03)合金磁致伸缩性能与显微组织的影响。实验结果表明,热处理后合金的磁致伸缩应变λ和dλ/dH都显著提高,显微组织由片状晶向多边形晶粒转化,而且富稀土相在样品表面和晶界析出,晶粒内部的富稀土相有球化趋势。合理控制热处理温度和时间可以显著提高该合金的磁致伸缩性能。更多还原

【Abstract】 The effects of heat treatment on the magnetostrictive properties and microstructure of Tb-Dy-Fe alloy with <110> crystal orientation was studied. The composition of alloy was Tb_0.3Dy_0.7 (Fe_1-xM_x)_1.95 （M=Mn, Al, Ti, B, x=0.03）. It is found that the magnetostrictive strains λ and dλ/dH are improved markedly; the crystal morphologies are changed from parallel planes to polygons; furthermore, rare earth rich phases disperse along the grain boundaries and sample surface, a part of it in the grains; and rare earth rich phase in the grains has a tendency to be spheroidized after heat treatment. The magnetostrictive properties of the alloy can be improved by controlling the heat treatment temperature and time.更多还原