Cu添加量对铸态CrFeCoNiCu_(x)高熵合金显微组织和力学性能的影响  

Effects of Cu additions on microstructure and mechanical properties of as-cast CrFeCoNiCu_(x)high-entropy alloy

作　　者：胡强[1] 王海玲 钱立华 曾良才 王强[3,4] 刘鑫旺 Qiang HU;Hai-ling WANG;Li-hua QIAN;Liang-cai ZENG;Qiang WANG;Xin-wang LIU(Institute of Applied Physics,Jiangxi Academy of Sciences,Nanchang 330029,China;School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China;Key Laboratory of Metallurgical Equipment and Control Technology,Ministry of Education,School of Machinery and Automation,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering,School of Machinery and Automation,Wuhan University of Science and Technology,Wuhan 430081,China;State Key Laboratory of Materials Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]江西省科学院应用物理研究所,南昌330029 [2]华中科技大学物理学院,武汉430074 [3]武汉科技大学机械自动化学院冶金装备及其控制教育部重点实验室,武汉430081 [4]武汉科技大学机械自动化学院机械传动与制造工程湖北省重点实验室,武汉430081 [5]华中科技大学材料科学与工程学院材料成形与模具技术国家重点实验室,武汉430074

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第6期1803-1813,共11页中国有色金属学报（英文版）

基　　金：the support of the National Natural Science Foundation of China(Nos.52001236,51971099);the Natural Science Foundation of Hubei Province,China(No.2020CFB113);the Open Fund of State Key Laboratory of Materials Processing and Die&Mould Technology,China(No.P2022-010)。

摘　　要：详细研究Cu添加量对铸态CrFeCoNi高熵合金显微组织演变和室温拉伸性能的影响。研究结果表明,添加Cu元素使高熵合金相结构由FCC单相转变为FCC1+FCC2双相。FCC2相是存在于枝晶间的富Cu相,且其体积分数随Cu含量的增加而提高。富Cu相的形成主要归因于Cu与其他金属元素的混合焓较大,从而导致凝固之前的液相分离。由于位错滑移的短程障碍增强,高熵合金的屈服强度和极限抗拉强度与Cu含量呈正相关关系。然而,由于位错在晶界堆积而产生的应力场叠加更为显著,因此,含Cu高熵合金的断裂应变较小。The influences of Cu additions on the microstructural evolution and room-temperature tensile properties of the as-cast CrFeCoNi were investigated in detail.The results revealed that the structure of the alloy changed from a FCC single-phase to FCC1 plus FCC2 dual-phase by adding Cu element.The FCC2 phase was determined to be Cu-rich phase existing in the inter-dendrite region,and its volume fraction increased with the increase of Cu additions.The formation of Cu-rich inter-dendrite was mainly ascribed to the liquid-phase separation induced by the large positive mixing enthalpy between Cu and other metallic elements.The yield and ultimate tensile strengths against the Cu content displayed a positive correlation due to the enhancement of short-range obstacles to dislocations slip,while the more significant superposition of stress field produced by the dislocation piling-ups at grain boundaries of Cu-containing high-entropy alloys led to a small fracture strain.

关 键 词：高熵合金 富Cu相 显微组织 抗拉强度 断裂应变 

分 类 号：TG139[一般工业技术—材料科学与工程]