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SmCo_5永磁合金是一种用途广泛的永磁材料,其居里点约为740℃。为找出材料在400℃以上性能变坏的原因,尝试进行了室温至740℃温度范围内等时(2小时)退火处理的SmCo_5合金的正电子湮灭研究。结果发现,材料中明显地存在着沉淀相的析出。作者认为,至少不能排除这一过程作为影响磁性的重要原因。 正电子平均湮灭率λ_(ap)能反映材料的基体性质。它的倒数称为材料的基体正电子寿命τb,
SmCo_5 permanent magnet alloy is a widely used permanent magnet material with a Curie point of about 740 ° C. In order to find out the reasons for the deterioration of the material above 400 ℃, the positron annihilation study of SmCo_5 alloy annealed at isochronous (2 h) temperature range from room temperature to 740 ℃ was attempted. As a result, it was found that precipitation of the precipitated phase apparently existed in the material. The author believes that at least can not rule out this process as an important factor affecting the magnetic. The average positron annihilation rate λ_ (ap) can reflect the material’s matrix properties. Its reciprocal is called the positron lifetime τ b of the material,