等离子熔覆法制备Al_xCoCrFeNi高熵合金微观组织与性能研究  

Microstructure and Properties of Al_xCoCrFeNi High-entropy Alloys Prepared by Plasma Cladding

作　　者：王虎 王智慧[2] WANG Hu;WANG Zhihui(College of Materials Engineering,North China Institute of Aerospace Engineering,Langfang 065000;College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124)

机构地区：[1]北华航天工业学院材料工程学院,廊坊065000 [2]北京工业大学材料科学与工程学院,北京100124

出　　处：《材料导报》2018年第4期589-592,597,共5页Materials Reports

基　　金：河北省高等学校科学技术研究项目(QN2017301);国家自然科学基金(51275010);河北省廊坊市科技支撑计划项目(2017011020);河北省大学生创新创业训练计划项目(CX2017136X)

摘　　要：利用等离子熔覆法在Q235基体上制备了Al_xCoCrFeNi(x=1、1.5,x为摩尔分数)高熵合金,对熔覆层的化学成分、相结构、微观组织和显微硬度进行了研究。结果表明:熔覆态高熵合金具有简单的固溶体结构,微观组织为树枝晶,Al含量从x=1增加到x=1.5时,物相组成由FCC+BCC两相转变为单一的BCC相;当x=1.5时,枝晶间有纳米级颗粒析出;Al_(1.5)CoCrFeNi熔覆层与基体呈现良好的冶金结合,界面附近的热影响区由于珠光体脱碳分解而形成了约为80μm宽的铁素体带;随着Al含量的增加,熔覆层的显微硬度从x=1时的478HV增加到x=1.5时的530HV。The Al x CoCrFeNi(x=1,1.5,x is mole fraction)high-entropy alloys cladding layers were prepared on Q235 steel substrate by plasma cladding.The component,crystal structure,microstructure and microhardness of the cladding layers were investigated.The results indicated that high-entropy alloys cladding layers had simple solid-solution structure.The content of aluminum increased from x=1 to x=1.5,and the phase composition transformed from the mixed FCC+BCC phase to the single BCC phase.The microstructure of cladding layers is dendrite structure.When x=1.5,the nanoparticles were deposited in the dendrite.Al 1.5-CoCrFeNi alloy had a good metallurgical combination with the substrate.A ferrite band with width about 80μm was appeared at HAZ near the interface which was caused by decarburizing of pearlite.With the addition of aluminum changed from x=1 to x=1.5,the microhardness of cladding layers increased from 478HV to 530HV.

关 键 词：高熵合金 等离子熔覆 微观组织 显微硬度 

分 类 号：TB383[一般工业技术—材料科学与工程]