摘要
高熵合金(HEA)由于其多主元和高混合熵的特点,具有一些传统合金难以实现的优异性能,在表面技术领域具有很大的应用前景。本研究采用基于铝热反应/喷射沉积的高熵合金熔覆涂层技术,在45钢表面制备了FeCrNiCuAlSn 0.5高熵合金涂层,并采用XRD、SEM和EDS分析了FeCrNiCuAlSn 0.5高熵合金涂层的相结构、显微组织及元素分布,利用维氏硬度仪、顶断试验机和球盘式摩擦计测定了涂层的硬度、结合强度及摩擦磨损性能。结果表明,喷射涂层主要由FCC相和BCC相组成,可能含有少量的Ni 3Sn 2相。涂层组织为树枝晶,二次枝晶臂间距大约为(5.25±2.75)μm,平均冷却速度达到2.37×104 K/s。涂层与基体交界处未出现气孔、夹杂等缺陷,实现了良好的冶金结合,涂层与基体的平均结合强度为(412.8±16)MPa。涂层的平均显微硬度值为(539±10)HV,摩擦系数为0.50,磨损率为(7.24±0.52)×10-6 mm 3/(N·m);而45钢基体的摩擦系数为0.75,磨损率为(1.45±0.35)×10-5 mm 3/(N·m),表现出比基体更为优异的耐磨性能。
High-entropy alloy(HEA)has some excellent properties which are difficult to achieve by traditional alloys because of its characteristics of multi-principal element and high mixing entropy,and has great application prospects in the field of surface technology.In this paper,FeCrNiCuAlSn 0.5 HEA coating was prepared on the surface of 45 steel based on the thermite reaction/spray deposition HEA cladding coating technology.XRD,SEM and EDS were used to analyze the phase structure,microstructure and element distribution of the FeCrNiCuAlSn 0.5 HEA coa-ting,and the hardness,bonding strength,friction and wear properties of the coating were determined using Vickers hardness tester,top breaking test machine and ball disc friction meter.The results showed that the spray coating was mainly composed of FCC phase and BCC phase,and may contained a small amount of Ni 3Sn 2.The microstructure of coating was dendrite,the secondary dendrite arm spacing was about(5.25±2.75)μm,and the average cooling rate reached 2.37×104 K/s.No defects such as pores and inclusions appeared at the interface between the coating and the substrate,and a good metallurgical bond was achieved.The average bonding strength of the coating and substrate was(412.8±16)MPa.The average microhardness of the coating was(539±10)HV,the friction coefficient and the wear rate was 0.50,(7.24±0.52)×10-6 mm 3/(N·m),respectively,while the friction coefficient and wear rate of the 45 steel substrate was 0.75,(1.45±0.35)×10-5 mm 3/(N·m),respectively,showing more excellent wear resistance than the substrate.
作者
陈刚
罗涛
沈书成
陶韬
唐啸天
薛伟
夏义
CHEN Gang;LUO Tao;SHEN Shucheng;TAO Tao;TANG Xiaotian;XUE Wei;XIA Yi(College of Materials Science and Engineering,Hunan University,Changsha 410082,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第17期17047-17051,共5页
Materials Reports
基金
国家自然科学基金(51971091)。
关键词
高熵合金
铝热反应
喷射沉积
涂层
high-entropy alloy
thermite reaction
spray deposition
coating
