Refractory high-entropy silicide-borides (HESB) introduce a new field of high temperature materials by combining metallic high-entropy alloys (HEAs) with intermetallics based on a refractory metal (RM)-silicon-boron alloys, well known from Mo–Si–B alloys. Three different silicon and boron containing alloys (RM-15Si–5B), equiatomic in their four- or five-component refractory metals, were manufactured using arc-melting. The as-cast materials, as well as the samples annealed at 1200 °C, were analysed according to their phase composition and evolution of the microstructures. For the alloys equiatomic in RM (20Mo–20V–20Nb–20Ti–15Si–5B), the three phases RM₅Si₃, T2, and BCC were identified, which aligns with those described for Mo–Si–B alloys with similar silicon and boron contents. For both the 20Mo–20V–20Cr–20Ti–15Si–5B and 16Mo–16V–16Nb–16Cr–16Ti–15Si–5B compositions an additional A15 phase was found. In the first case this phase remained present after annealing, while in the second the A15 decomposes to C14 Laves phase and Ti₅Si₃ with annealing. The phase transformations are discussed in light of their potential to create a fine grained microstructure, which is generally favourable for such alloys for creep and oxidation properties.

难熔高熵硅化物-硼化物 (HESB) 通过将金属高熵合金 (HEAs) 与基于难熔金属 (RM)-硅-硼合金的金属间化合物相结合，引入了一个高温材料的新领域，众所周知的是 Mo-Si -B 合金。三种不同的含硅和硼合金 (RM-15Si-5B)，在其四或五组分难熔金属中是等原子的，是使用电弧熔炼制造的。铸态材料以及在 1200 °C 下退火的样品根据它们的相组成和微观结构的演变进行了分析。对于 RM 等原子合金 (20Mo–20V–20Nb–20Ti–15Si–5B)，三相 RM ₅ Si ₃、T2 和 BCC 已确定，这与对具有相似硅和硼含量的 Mo-Si-B 合金的描述一致。对于 20Mo–20V–20Cr–20Ti–15Si–5B 和 16Mo–16V–16Nb–16Cr–16Ti–15Si–5B 成分，发现了额外的 A15 相。在第一种情况下，该相在退火后仍然存在，而在第二种情况下，A15 通过退火分解为 C14 Laves 相和 Ti ₅ Si ₃。讨论了相变，因为它们具有产生细晶粒微观结构的潜力，这通常有利于此类合金的蠕变和氧化性能。