Oxygen-assisted spinodal structure achieves 1.5 GPa yield strength in a ductile refractory high-entropy alloy
作者机构：State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’an 710072China Research&Development Institute of Northwestern Polytechnical University in ShenzhenShenzhen 518063China
出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)
年 卷 期：2023年第157卷第26期
页 面：11-20页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：the financial support from the National Natural Science foundation of China(NSFC,Granted No.52001266) the Fundamental Research Funds for the Cen-tral Universities(No.G2022KY05109,No.G2022KY05113) Guangdong Basic and Applied Basic Research Foundation(No.2023A1515012703) The Shanghai“Phosphor”Science Foundation,China(23YF1450900)
主 题：High entropy alloys Spinodal decomposition Strengthening mechanisms
摘 要：Refractory high-entropy alloys(RHEAs)with room-temperature ductility are drawing growing attention for potential high-temperature ***,the most widely used metallurgical mechanisms appear weak in optimizing their strength and ***,we report that the nanoscale spinodal struc-ture in Ti_(41)V_(27)Hf_(15)Nb_(15)O_(2)leads to the highest tensile yield strength(∼1.5 GPa)among the existing RHEAs and good elongation of∼12%.With the aid of thermodynamic calculations,we show that oxygen plays a dominant role in controlling the formation of the spinodal structure by influencing the spinodal gap of the Ti-V-Hf-Nb *** the atomic structure of the spinodal structure(β+β^(∗)),we showed that the large lattice misfit of the spinodal phases is mainly responsible for the excellent strengthen-ing effect while the planar to wavy dislocation glide mode transition accounts for the retained *** work provides a novel strategy to improve the mechanical properties of the RHEAs and deepens the understanding of their phase stabilities.
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