We developed a eutectic high-entropy alloy (EHEA) with appreciable high-temperature strength-plasticity balance. Structural characterizations of the as-cast sample revealed a lamellar structure with austenite (face-centered-cubic, FCC) and Laves phases. Upon annealing at 873 K, precipitation of nanoscale (Ni, Al, and Zr)-rich L1₂ phase from the FCC phase took place, which eventually transformed into a martensitic (hexagonal, ε) phase with rearrangement of atomic species. Compressive properties revealed a brittle behavior at temperatures below 873 K, but changed to a ductile behavior with considerable strain hardening at 973 K, due to the formation of a high density of deformation twins observed by transmission electron microscopy.

我们开发了具有明显的高温强度-塑性平衡的低共熔高熵合金（EHEA）。铸态样品的结构表征显示出具有奥氏体（面心立方，FCC）和拉夫斯相的层状结构。在873 K退火后，从FCC相中析出了富含纳米级（Ni，Al和Zr）的L1 ₂相，该相最终转变为马氏体（六方晶ε）相，并进行了原子种类的重新排列。压缩性能显示在低于873 K的温度下具有脆性，但由于在透射电子显微镜下观察到的高密度变形孪晶的形成，在973 K下转变为具有相当大的应变硬化的延性行为。