Abstract A quinary Cr–12Nb–5Ti–5Mo–5Si (at.%) alloy was prepared by arc melting in this study to improve the strength and toughness of Laves phase Cr2Nb alloy. The quinary alloy was solidified with full eutectic Cr2Nb/Cr, in which the Cr2Nb phase exceeded 55 vol % and existed as matrix. The eutectic was developed with an orientation relationship of {001}Cr2Nb//{001}Cr, leading to a low lattice mismatch of 15.57% at the eutectic interface. The yield strength and fracture toughness of the quinary alloy reached 1950–1980 MPa and 14.0–14.8 MPa⋅m1/2, respectively, much higher than most reported Cr2Nb alloys. The reason for the superior properties is the synergistic effects of solid solution strengthening, alloying toughening, and eutectic strengthening-toughening.

中文翻译：

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五元Cr2Nb/Cr原位复合材料强度和韧性的提高

摘要 本研究通过电弧熔炼制备了五元 Cr-12Nb-5Ti-5Mo-5Si (at.%)合金，以提高 Laves 相 Cr2Nb 合金的强度和韧性。五元合金以全共晶 Cr2Nb/Cr 凝固，其中 Cr2Nb 相超过 55 vol% 并作为基体存在。共晶以 {001}Cr2Nb//{001}Cr 的取向关系发展，导致共晶界面处的晶格失配率低至 15.57%。五元合金的屈服强度和断裂韧性分别达到 1950-1980 MPa 和 14.0-14.8 MPa·m1/2，远高于大多数报道的 Cr2Nb 合金。其优异性能的原因是固溶强化、合金化增韧和共晶强化-增韧的协同作用。