研究了铸造/热压 r_(19)Fe_(74.5)B_5Cu_(1.5)永磁体的磁硬化特点.发现磁体反磁化过程受反向畴的形核控制.矫顽力与晶粒尺寸的对数存在线性关系: _iH_c(MA/m)=1.7312—0.4816Ind(μm)根据反向畴形核的随机性和矫顽力的统计特性讨论了该式的物理意义。
Characteristics of magnetic hardening in cast-hot pressed magnetPr_(19)Fe_(74.5)B_5Cu_(1.5) were studied. The microstructure features and virgin magnetization curve reveal a nucleation controlled coercivity mechanism. Regression analysis shows that the intrinsic coercivity varies inversely as the logarithm of the average grain size: _iH_c(MA/m)=1.7312-0.4816lnd(μm) which confirms the randomness of nucleation of reversed domains and the statistical nature of coercivity, indicating that the decrease of grain size would reduce the average number of defects on its surface and lower the probability of magnetization reversal of a grain and the cumulative fraction of the grains that have reversed their magnetization. Coercivity is thus enhanced.
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| [3] | |
| [4] | |
| [5] |
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