The structure and magnetic hysteresis properties of nanocrystallized melt-spun ribbons with composition (Sm_0.8Zr_0.2)(Fe_0.72Co_0.24Ti_0.04)_z ( z = 10 – 12) are studied. It is shown that substitution of a part of iron in the composition of the alloy by cobalt raises substantially the Curie temperature but almost halves the coercivity. The decrease is connected with growth in the volume fraction of the α-(Fe, Co) soft magnetic phase and incompleteness of the process of ordering of the ThMn₁₂-type phase during annealing at 875 – 900°C. In contrast to the rapidly hardened alloys not containing Co, hydrogenation of the of (Sm_0.8Zr_0.2)(Fe_0.72Co_0.24Ti_0.04) RHA powders is not accompanied by absorption of hydrogen and growth of the magnetic hysteresis properties.

研究了组成为（Sm _0.8 Zr _0.2）（Fe _0.72 Co _0.24 Ti _0.04）_z（z = 10 – 12）的纳米结晶熔纺带的结构和磁滞特性。结果表明，用钴代替合金成分中的一部分铁实质上提高了居里温度，但矫顽力几乎降低了一半。减少与在875 – 900°C的退火过程中α-（Fe，Co）软磁性相的体积分数的增长以及ThMn ₁₂型相的有序化过程的不完全有关。与不含Co的快速硬化合金相反，（Sm_0.8 Zr _0.2）（Fe _0.72 Co _0.24 Ti _0.04）RHA粉末不伴有氢的吸收和磁滞特性的增长。