对PrxCo50-xPt50 (x=0,0.2,0.4,0.6,0.8,1.0)合金的显微结构和磁性能进行了研究.X射线衍射结果表明:经1000℃均匀化后合金为单一的面心立方相(fcc),而经675～750℃退火后合金由硬磁相(面心四方结构,fct)和软磁相组成.随着Pr含量增加,fct的(111)衍射峰向高角度偏移,并且c/a增大导致有序度S减小.合金Pr0.4Co49.6Pt50经675℃退火60 min后,矫顽力和剩磁比达到最大值.PrxCo50-xPt50(x=0,0.2,0.4,0.6,0.8,1.0)经675℃退火60min的样品,矫顽力随着Pr含量的增加而单调减小,但剩磁比先增大后减小.
The effects of Pr on the microstructure and magnetic properties of PrxCo50-xPt50 alloys (x =0,0.2,0.4,0.6,0.8,1.0) were investigated.The XRD results indicate that all the alloys homogenized at 1000 ℃ contain only a single A1 (fcc) phase,while the alloys annealed at 675-750 ℃ consist of a hard-magnetic face-centered-tetragonal (fct) phase and a magnetically soft fcc phase.The (111) reflection belonging to the fct phase shifts to a higher angle and the c/a ratio increases as the Pr content increases,which leads to a decrease in the degree of ordering,S.Maximum values for the coercivity Hc and the remanence ratio mr are achieved in Pr0.4Co49.6Pt50 alloys annealed at 675 ℃ for 60 min.For the series of PrxCo50-xPt50 alloys annealed at 675 ℃ for 60 min,Hc decreases monotonically with increasing of Pr concentration,but mr is first enhanced and then weakened,showing a maximum value of 0.82 at x =0.4 to 0.6.
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