Cr含量对FeNiCuCoCr_(x)(x=0,0.5,1.0,1.5,2.0)高熵合金相演变、耐高温氧化、抗腐蚀性能的影响  

Effect of Cr Content on Phase Evolution,High-Temperature Oxidation Resistance and Corrosion Resistance of FeNiCuCoCr_(x)(x=0,0.5,1.0,1.5,2.0)High-Entropy Alloys

作　　者：陈浩[1] 吴广鑫 乔云泽 华宇 刘长春 原紫渲 黄英德 杨文杰 CHEN Hao;WU Guangxin;QIAO Yunze;HUA Yu;LIU Changchun;YUAN Zixuan;HUANG Yingde;YANG Wenjie(School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州大学材料科学与工程学院,郑州450001

出　　处：《硅酸盐通报》2025年第2期746-755,共10页Bulletin of the Chinese Ceramic Society

基　　金：云南省科技厅科技计划(202202AB080017)。

摘　　要：本文系统地研究了Cr元素对FeNiCuCoCr_(x)(x=0,0.5,1.0,1.5,2.0)高熵合金粉末的相组成、微观形貌、高温烧结过程中的相演变及块状高熵合金耐高温氧化性能和抗腐蚀性能的影响。结果表明,机械合金化后的高熵合金粉末均由面心立方(FCC)相和体心立方(BCC)相组成,随着Cr含量的增加,BCC相特征峰的强度增强。高熵合金FeNiCuCoCr_(x)(x=0,0.5,1.0,1.5,2.0)的BCC相在高温烧结过程中溶解在基体中,FCC相则分解转变为富Cu相(FCC1相)和缺Cu相(FCC2相),合金组织成分均匀度较高。在900℃的等温氧化过程中,FeNiCuCoCr_(0.5)高熵合金氧化膜连续且致密,与基体紧密结合,当膜厚度为25μm时,其耐高温氧化性能最优异。3.5%(质量分数)NaCl溶液中的电化学测试结果表明,FeNiCuCoCr_(0.5)高熵合金的抗腐蚀性能最好,其腐蚀电流密度为5.56×10^(-8)A/cm^(2),电荷转移电阻为6821Ω·cm^(2),相较于其他FeNiCuCoCr_(x)(x=0,1.0,1.5,2.0)高熵合金腐蚀电流密度低了1个数量级;相较于其他FeNiCuCoCr_(x)(x=0,1.0,1.5,2.0)高熵合金,FeNiCuCoCr_(0.5)高熵合金的转移电阻分别提高了51.9%、18.8%、233.4%和265.3%。研究结果为构建抗腐蚀FeNiCuCoCr高熵合金的成分设计提供了新思路。In this paper,the effect of Cr element on the phase composition,microstructure,phase evolution of FeNiCuCoCr_(x)(x=0,0.5,1.0,1.5,2.0)high-entropy alloy powders and on the high-temperature oxidation resistance and corrosion resistance of bulk high-entropy alloys were systematically investigated.The results show that the high-entropy alloy powders after mechanical alloying are composed of face-centered cubic(FCC)phase and body-centered cubic(BCC)phase.With the increase of Cr content,the strength of the characteristic peak of BCC phase increases.The BCC phase of FeNiCuCoCr_(x)(x=0,0.5,1.0,1.5,2.0)high-entropy alloys is dissolved in the matrix during high-temperature sintering,and the FCC phase is decomposed into Cu-rich phase(FCC1 phase)and Cu-deficient phase(FCC2 phase),and the microstructure and composition uniformity of the alloy is high.During the isothermal oxidation process at 900℃,the FeNiCuCoCr_(0.5)high-entropy alloy forms a continuous and dense oxide film that adheres tightly to the substrate.When the thickness of the film is 25μm,its high-temperature oxidation resistance is the best.The electrochemical tests results in 3.5%(mass fraction)NaCl solution reveal that the FeNiCuCoCr_(0.5)high-entropy alloy exhibits the best corrosion resistance,with a corrosion current density of 5.56×10^(-8)A/cm^(2)and a charge transfer resistance of 6821Ω·cm^(2).Compared to other FeNiCuCoCr_(x)(x=0,1.0,1.5,2.0)high-entropy alloys,the corrosion current density is one order of magnitude lower.Compared to other FeNiCuCoCr_(x)(x=0,1.0,1.5,2.0)high entropy alloys,the transfer resistance of FeNiCuCoCr_(0.5)high entropy alloy increases by 51.9%,18.8%,233.4%and 265.3%.The research results provide new ideas for the composition design of corrosion-resistant FeNiCuCoCr high-entropy alloys.

关 键 词：机械合金化 相变 FeNiCuCoCr_(x)高熵合金 高温烧结 耐高温氧化性能 抗腐蚀性能 

分 类 号：O792[理学—晶体学]