【摘要】 通过穆斯堡尔谱、透射电镜、x射线和磁测量等手段研究了将普通FeCrCo合金中Cr,Co元素含量提高、并加入Mo,Zr元素后合金矫顽力的变化,发现其值76kAm比普通值40—52kAm高50%以上.对该合金不同热处理阶段的穆斯堡尔谱的测试表明,合金的微观结构与普通FeCrCo合金有显著的不同.固溶处理后合金单相性好,不产生对磁性起破坏作用的γ相;磁场热处理过程中,发生原子的重新排布,α2相开始出现,两相结构基本确定;分级回火后,调幅分解进行得更彻底,合金内部完全形成调幅结构,与低矫顽力合金相比,铁磁性的α1相更容易形成.更多还原

【Abstract】 Variation of the coercivity induced by increasing Cr and Co contents and adding inpurities of Mo and Zr in FeCrCo alloys was investigated using Mssbauer spectra, fransmission electron microscopy, x-ray diffraction, and magnetic measurement. A coercivity as high as 76kA/m is obtained, which is one and half times higher than that (40—52kA/m) of the common alloy. Mssbauer spectra shows that the microstructure of the high-coercivity alloy is apparently different from that of the traditional FeCrCo alloy. The alloy is single-phase after solution treatment, the non-magnetic γ phase, which weakens the magnetic properties, does not appear. During the thermomagnetic treatment, the atomic distribution is rearranged, and leads to the formation of the α-2 phase, the spinodal structure with the two-phase (α-1 +α-2 ) in the alloy fully forms after step-tempering. It might be beneficial for forming the high coercivity in alloy. Comparied with the low-coercivity case, more of the α-1 phase exist in the spinodal structure.更多还原