Ag、Cu、Ce元素对Fe基中熵合金力学及腐蚀性能的影响  

Mechanical and Corrosion Properties of Fe-Based Medium Entropy Alloys with Minor Element Addition

作　　者：赵燕春[1] 张敏亚 张林浩 李文生[1] 寇生中[1] 石磊[2] Zhao Yanchun;Zhang Minya;Zhang Linhao;Li Wensheng;Kou Shengzhong;Shi Lei(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;Department of Oral and Maxillofacial Surgery,Gansu Provincial Hospital,Lanzhou 730000,China)

机构地区：[1]兰州理工大学省部共建有色金属加工与再利用国家重点实验室,甘肃兰州730050 [2]甘肃省人民医院口腔颌面外科,甘肃兰州730000

出　　处：《稀有金属材料与工程》2022年第11期4146-4156,共11页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51661017,52061027);甘肃省杰出青年基金(17JR5RA108);兰州理工大学红柳优秀青年基金(2018)。

摘　　要：采用磁悬浮熔炼-负压铜模吸铸法,制备出Fe_(63.3)Mn_(14)Si_(9.1)Cr_(9.8)C_(3.8)及(Fe_(63.3)Mn_(14)Si_(9.1)Cr_(9.8)C_(3.8))_(99)X_(1)(X=Ag,Cu,Ce)中熵合金棒状试样,研究了添加1at%的Ag、Cu、Ce元素对合金的组织结构、力学性能和耐蚀性能的影响。由热力学计算表明,添加1%的Ag、Cu、Ce元素后合金熵值在1R~1.5R之间,属于中熵合金的范畴,混合焓为负,原子尺寸差、电负性差及价电子浓度值都较小,形成单一fcc结构。研究结果表明由于Ce对熔体净化作用及晶粒细化作用使其综合力学性能最佳,断裂强度为2815 MPa,屈服强度为854 MPa,塑性应变为22.89%,硬度最大可达6452.3 MPa。稀土Ce在表面富集,合金体系的能量较低,晶粒较细,腐蚀后形成致密且均匀的钝化膜。而合金中富Cu相和富Cr相形成微小原电池,富Cu相会优先发生腐蚀,恶化合金的耐蚀性能。The Fe_(63.3)Mn_(14)Si_(9.1)Cr_(9.8)C_(3.8) and (Fe_(63.3)Mn_(14)Si_(9.1)Cr_(9.8)C_(3.8))_(99)X_(1)(X=Ag,Cu,Ce)medium entropy alloys were fabricated by magnetic levitation melting and negative pressure copper mold suction casting method.The effects of adding 1at%Ag,Cu and Ce on the microstructure,mechanical properties and corrosion resistance of the alloy were studied.After adding 1 at%of Ag,Cu,Ce,the alloy entropy value is between 1R and 1.5R,which belongs to the category of medium entropy alloy.The mixed alloy is negative,and the atomic size difference,electronegativity difference and valence electron concentration value are small so it has the single fcc structure.(Fe_(63.3)Mn_(14)Si_(9.1)Cr_(9.8)C_(3.8))_(99)Ce1 alloy has the largestδand large lattice distortion energy.Ce makes the alloy has the best comprehensive mechanical properties by purifying the melt and grain refinement.The fracture strength is 2815 MPa,the yield strength is 854 MPa,the elongation rate is 22.89%,and the maximum hardness can reach 6452.3 MPa.The alloy system has lower energy,finer grains,and enrichment of rare earth Ce on the surface,so a dense and uniform passivation film is formed after corrosion.In(Fe_(63.3)Mn_(14)Si_(9.1)Cr_(9.8)C_(3.8))_(99)Cu_(1),the Cu-rich phase and Cr-rich phase form micro galvanic cells.The Cu-rich phase will corrode preferentially,and Cu deteriorates the corrosion resistance of the alloy.

关 键 词：中熵合金 热力学计算 力学性能 组织结构 耐腐蚀性 

分 类 号：TG139[一般工业技术—材料科学与工程]