In this work, AlMgB₁₄-based materials were obtained from an (Al–Mg)–B powder mixture by spark plasma sintering. The microstructure, phase composition, and properties of the obtained materials were investigated. The sample, which was sintered at a temperature of 1400 °C, has the highest average hardness of 29.5 GPa with a maximum measured hardness value of 34.55 GPa. The density of the obtained sample is 2.621 g/cm³ (theoretical density of pure AlMgB₁₄ is 2.59 g/cm³). A mechanism for the decomposition of AlMgB₁₄ at local overheating of the (Al–Mg)–B powder mixture during spark plasma sintering was proposed. In the first stage, AlMgB₁₄ decomposes into AlB₁₂, an intermetallic compound Al₁₂Mg₁₇ and Mg. In the second stage, the decomposition products react with oxygen to form spinel MgAl₂O₄ and aluminum borate Al₄B₂O₉. Finally, the use of isothermal holding for 5 min at a temperature of 1470 °C leads to an increase in the MgAl₂O₄ spinel content, further reaction of Al₂O₃ and boron oxide B₂O₃ and, as a consequence, the formation of borate Al₁₈B₄O₃₃.

在这项工作中，通过火花等离子体烧结从（Al–Mg）–B粉末混合物中获得基于AlMgB ₁₄的材料。研究了所得材料的微观结构，相组成和性能。在1400°C的温度下烧结的样品具有29.5 GPa的最高平均硬度和34.55 GPa的最大测得硬度值。所得样品的密度为2.621g / cm ³（纯AlMgB _14的理论密度为2.59g / cm ³）。提出了在等离子烧结过程中（Al-Mg）-B粉末混合物局部过热时AlMgB ₁₄分解的机理。在第一阶段，AlMgB ₁₄分解为AlB ₁₂，金属间化合物Al ₁₂ Mg ₁₇和Mg。在第二阶段中，分解产物与氧反应形成尖晶石MgAl ₂ O ₄和硼酸铝Al ₄ B ₂ O ₉。最后，在1470°C的温度下等温保持5分钟会导致MgAl ₂ O ₄尖晶石含量增加，Al ₂ O ₃与氧化硼B ₂ O ₃进一步反应，结果，硼酸盐Al ₁₈ B ₄ O _33的形成。