摘要
对CoCrCuFeNi高熵合金在NH_(3)+H_(2)的低氮势气氛下进行低温440℃保温16 h的稀土等离子渗氮表面改性处理。低温渗氮生成两种物相结构:化合物相Fe4N和简单固溶体相γN,这两种相是硬度提高的主要原因。La的添加促进N原子向内扩散,化合物层和渗氮层厚度增幅分别为16.9%和20.6%,化合物层的平均N原子浓度增加42.5%。氮化后试样表面硬度提高5倍以上,并且添加La的试样横截面硬度梯度下降更缓慢。γN相具有较好的耐蚀性,氮化试样比未处理试样腐蚀速率降低2倍,自腐蚀电位升高。
CoCrCuFeNi high-entropy alloy was surface modified by rare earth plasma nitriding at a low temperature of 440℃for 16h under a low nitrogen potential atmosphere of NH_(3)+H_(2).Two kinds of phase structures were generated during the low temperature nitriding process:compound phase Fe4N and simple solid solution phase Ng,which were the main reasons for the hardness increase.The addition of La promoted the inward diffusion of N atoms,the thickness of compound layer and nitrided layer increased by 16.9%and 20.6%,respectively,and the average N atom concentration of compound layer increased by 42.5%.The surface hardness of the nitrided sample increased more than 5 times,and the cross-section hardness gradient of the sample with La decreases more slowly.The Ngphase has good corrosion resistance,the corrosion rate of the nitrided sample is reduced by 2 times compared with that of the untreated sample,and the self-corrosion potential increased.
作者
王妍
由园
许诗淼
邢秋妍
王思宇
侯钦祥
顾峰
边楠
王超会
程伟东
WANG Yan;YOU Yuan;XU Shi-miao;XING Qiu-yan;WANG Si-yu;HOU Qin-xiang;GU Feng;BIAN Nan;WANG Chao-hui;CHENG Wei-dong(School of Materials Science and Engineering,Heilongjiang Provincial Key Laboratory of Polymeric Composition materials,Qiqihar University,Heilongjiang Qiqihar 161006,China)
出处
《齐齐哈尔大学学报(自然科学版)》
2025年第5期57-61,共5页
Journal of Qiqihar University(Natural Science Edition)
基金
国家自然科学基金项目(51401113)
黑龙江省自然科学基金项目(E2016069)
黑龙江省高校基本科研业务费项目(145209302)
齐齐哈尔大学研究生创新科研项目(QUZLTS_CX2023036)
山东省重点研发计划(2024TSGC0498,2024TSGC0505)。
关键词
等离子渗氮
高熵合金
稀土
硬度
耐蚀性
plasma nitriding
high entropy alloy
rare earth
hardness
corrosion resistance
