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用粉末冶金方法制备的Sm(Co,Cu,Fe,Zr)_(7.4)合金,其磁性能:B_r=1.12(T),_iH_c=1078(kA/m),(BH)_(max)=243.6(kJ/m~3).采用透射电子显微镜和Mo-ssbauer谱仪研究了合金的胞状组织析出过程和Zr的作用.研究发现:胞状组织形成温度为460℃,富Zr长片相在780℃出现,合金的矫顽力随胞状组织发育尺寸,数量多少,完善程度而变化.合金中的Zr促使Fe原子由1:5相进入2:17相,(Zr加速了2:17相中Fe原子由Co_1晶位转移到Co_3晶位,从而增加了两相之间成分差别,增加了单轴各向异性,有利于合金矫顽力的提高.
The magnetic properties of Sm (Co, Cu, Fe, Zr) _ (7.4) alloys prepared by the powder metallurgy method are: B_r = 1.12 (T), _iH_c = 1078 (kA / m) 243.6 (kJ / m ~ 3) .Through transmission electron microscopy and Mo-ssbauer spectrometer to study the precipitation process of the cellular structure of the alloy and the role of Zr.It was found that: the cell formation temperature is 460 ℃, Zr-rich long phase in 780 ℃, and the coercivity of the alloy changed with the size, amount and perfection of the cellular structure.The Zr in the alloy promoted the Fe atom to enter the 2:17 phase from the 1: 5 phase and the Zr accelerated the phase of Fe in 2:17 The atoms are transferred from the Co_1 crystal to the Co_3 crystal, which increases the component difference between the two phases and increases the uniaxial anisotropy, which is favorable for the improvement of the coercive force of the alloy.