The phase and structural transformations of a powder hard magnetic alloy of the Fe–30% Cr–27% Co–1% Si–0.07% B system with a metastable α₁ + α₂ phase composition, elevated cobalt content, and high level of magnetic properties are studied. The density and variation coefficient of the concentration of main elements of sintered billets at a level of deformable analogs are attained by sintering in the α phase with contact melting in the presence of a “vanishing” liquid phase formed due to the addition of silicon and boron ferroalloys. A kinetic approach to the development of a competitive hard magnetic alloy with a high fraction of a strong magnetic phase is proposed. The influence of boron additives on the incubation period of the formation of the undesirable σ phase and the temperature range of the concentration stratification of the α solid solution into the strong magnetic α₁ phase and weak magnetic α₂ phase are established. Optical microscopy, X-ray phase analysis, and differential scanning calorimetry are used to determine the temperature–temporal parameters of the thermal treatment of the alloy, including quenching, thermomagnetic treatment (TMT), and final aging, which provide the required combination of H_c and B_r due to an increase in stability of a metastable α phase up to 20 min in a temperature range of spinodal decomposition α → α₁ + α₂. The largest increase in magnetic properties after TMT observed at the first and second stages of final aging is associated with the supplementary decomposition of the α solid solution and the formation of subgrain boundaries. Elements of the formed structure have submicron and nanometer sizes that correlate with the results of studying the deformable alloys based on the Fe–Cr–Co system. The anisotropic α₁ + α₂ structural state attained by thermomagnetic treatment provides an increase in characteristics of magnetic properties of the studied 30Kh27KSRA powder alloy to 30% and squareness ratio of the magnetic hysteresis loop of 0.82.

中文翻译：

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基于Fe–30％Cr–27％Co体系的非均质磁性材料的相变和性质

中的Fe-30％的Cr-27％CO-1％的Si-0.07％B系统中的粉末的硬磁合金构成的相和结构变换与亚稳α ₁ +α ₂研究了相组成，提高的钴含量和高水平的磁性。在存在由于硅和硼的添加而形成的“消失”液相的情况下，在接触熔化的情况下，在α相中进行接触熔融烧结，从而获得了可变形类似物水平下的烧结坯料主要元素浓度的密度和变化系数。铁合金。提出了一种动力学方法来开发具有高比例强磁性相的竞争性硬磁合金。硼添加剂对不希望的σ相的形成和α固溶体的浓度分层的温度范围的温育期的影响到强磁α _1个相和弱磁性α ₂阶段建立。光学显微镜，X射线相分析和差示扫描量热法用于确定合金热处理的温度-时间参数，包括淬火，热磁处理（TMT）和最终时效，这些参数可提供所需的H组合。_ç和乙_{- [R}由于在温度范围的增加的亚α相的向上稳定20分钟旋节线分解α→α ₁ +α ₂。在最终老化的第一阶段和第二阶段观察到的TMT之后，磁性能的最大增加与α固溶体的补充分解和亚晶界的形成有关。形成结构的元素具有亚微米和纳米尺寸，与基于Fe–Cr–Co系统的可变形合金的研究结果相关。各向异性α ₁ +α ₂由热磁治疗达到结构状态提供了在30％所研究的30Kh27KSRA粉末合金的磁特性和0.82的磁滞回线的矩形比的特性的增加。