摘要
借助电极感应熔化气雾化法,制备了FeCoNiCrMn高熵合金粉末;通过真空烧结技术,在钢表面制备了具有不同孔隙率和孔径的多孔高熵合金涂层.研究了不同烧结工艺对多孔涂层孔隙率、孔径以及过渡层厚度的影响.开展了Al-12Si合金在多孔高熵涂层钢表面的原位润湿铺展试验,探讨了多孔高熵合金涂层对表观接触角和铺展行为的影响规律,深入分析了多孔高熵结构内反应产物的显微组织和相组成.结果表明,随着烧结温度的升高和保温时间的延长,多孔高熵合金涂层的过渡层厚度逐渐升高,孔隙率及平均孔径逐渐减少.液态Al-12Si合金液滴在多孔涂层中微通道增强的毛细力作用下,迅速浸润到多孔结构中,并实现了材料表面的完全润湿.在高熵合金的迟滞扩散效应与高熵效应共同作用下,界面反应层中金属间化合物的形成受到显著阻碍,界面相结构由富Cr的FCC、富AlFe的BCC以及富AlNi的B2+富Al的BCC共晶状结构组成.
Fe Co Ni Cr Mn high entropy alloy powder was prepared by electrode induction melting gas atomizing method,and porous high-entropy alloy coatings with different porosities and pore diameters were prepared on the steel surface by vacuum sintering technique. The effects of different sintering processes on the porosity, pore size and transition layer thickness of the porous coatings were studied. In situ wetting and spreading tests of Al-12Si alloy on the surface of porous highentropy coated steel were carried out to explore the influence of the porous high-entropy alloy coating on the apparent contact angle and spreading behavior, and the microstructure and phase composition of the reaction products within the porous highentropy structure were analyzed in depth. The results show that with the increase of sintering temperature and the extension of holding time, the transition layer thickness of the porous highentropy alloy coating gradually increases, and the porosity and average pore size gradually decrease. Liquid Al-12Si alloy droplets rapidly infiltrated into the porous structure and achieved complete wetting of the material surface under the action of capillary forces enhanced by microchannels in the porous coating. The formation of intermetallic compounds in the interfacial reaction layer is significantly hindered by the combined effect of hysteresis diffusion and high entropy of the high-entropy alloy, and the interfacial phase structure consists of Cr-rich FCC, Al Fe-rich BCC, and Al Ni-rich B2+Al-rich BCC eutectic structures.
作者
郑敏
杨瑾
赵一璇
徐文虎
檀财旺
张华
ZHENG Min;YANG Jin;ZHAO Yixuan;XU Wenhu;TAN Caiwang;ZHANG Hua(Shanghai University of Engineering Science,Shanghai,201620,China;Nanchang University,Nanchang,330031,China;Shanghai Collaborative Innovation Center of Intelligent Manufacturing Robot Technology for Large Components,Shanghai,201620,China;Harbin Institute of Technology(Weihai),Weihai,264209,China)
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2022年第8期25-33,79,I0004,I0005,共12页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(51805315)
中国博士后科学基金(2021M691342).
关键词
多孔化
润湿性
高熵合金
反应润湿体系
显微组织
porous
wettability
high entropy alloy
reactive wetting system
microstructure
