Abstract The present work developed a new body-centered-cubic (BCC)-based Al0.4Nb0.5Ta0.5TiZr0.8 refractory high entropy alloy with coherent precipitation. The formation of cuboidal nanoprecipitates with a size of 25~50 nm in an 873 K-aged alloy is ascribed to a moderate lattice misfit. A Zr5Al3 phase also coexists with B2 in a same particle shape due to similar chemical compositions, in which Ti is enriched in B2 but not in Zr5Al3. The BCC/B2 coherency would be deteriorated with increasing the aging temperature, leaving coarse Zr5Al3 alone. Besides, there exist two kinds of BCC phases due to the segregations of Nb/Ta and Ti/Zr.

中文翻译：

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体心立方Al0.4Nb0.5Ta0.5TiZr0.8难熔高熵合金中立方纳米颗粒的相干沉淀和稳定性

摘要 本工作开发了一种新型体心立方(BCC)基Al0.4Nb0.5Ta0.5TiZr0.8相干析出难熔高熵合金。在 873 K 时效合金中形成尺寸为 25~50 nm 的立方体纳米沉淀物归因于适度的晶格失配。由于类似的化学成分，Zr5Al3 相也与 B2 以相同的颗粒形状共存，其中 Ti 富含 B2 但不富含 Zr5Al3。BCC/B2 相干性会随着时效温度的升高而恶化，只留下粗的 Zr5Al3。此外，由于Nb/Ta和Ti/Zr的偏析，存在两种BCC相。