摘要
Aseries of [(Fe_(0.6)Co_(0.2)Ni_(0.2))_(0.75-0.03x)B_(0.2)Si_(0.05+0.03x)]_(96)Nb_(4) amorphous alloy composite coatings were prepared by adjusting the silicon content(x=0,1,2,3,4,5,and 6)and their microstructures and tribological properties were investigated by laser cladding technique.Additionally,the effect of Si on the glass forming ability(GFA)of the layers was understood.Results show that an appropriate Si content can refine the microstructure of the FeCoNiBSiNb laser cladding layers and improve the mechanical and tribological properties.The hardness of the coating layer increases monotonically with the Si content.At the Si content of 4.8at%(x=0),the coating layer exhibits a relatively low hardness(734.2HV 0.1).Conversely,at the silicon content of 13.44at%(x=3),the coating layer exhibits the highest hardness(1106HV 0.1).The non-crystalline content and tensile strength exhibit an initial increase,followed by a subsequent decrease.At x=2,the coating exhibits its maximum fracture strength(2880 MPa).However,when x>2,the fracture strength of the coating decreases with an increase in x.Conversely,with an increase in Si content,the wear volume loss initially decreases and then increases.At a Si content of 10.56at%(x=2),the coating exhibits the highest non-crystalline content(42%),the highest tensile strength(2880 MPa),and the most favorable dry friction performance.
通过调整硅的含量(x=0,1,2,3,4,5,6),采用激光熔覆技术制备了[(Fe_(0.6)Co_(0.2)Ni_(0.2))_(0.75-0.03x)B_(0.2)Si_(0.05+0.03x)]_(96)Nb_(4)非晶合金复合涂层,并对其微观结构和摩擦学性能进行了研究。此外,还了解了Si对熔覆层的玻璃形成能力(GFA)的影响。结果表明,适当的Si含量可以细化FeCoNiBSiNb激光熔覆层的微观组织,提高其力学性能和摩擦学性能。熔覆层的硬度随Si含量的增加而单调增加,当Si含量为4.8%(原子分数,即x=0)时,涂层的显微硬度较低(734.2HV0.1)。当硅含量为13.44%(原子分数,即x=3)时,涂层的显微硬度最大(1106HV0.1),而非晶含量和抗压强度先增加后降低。当x=2时,涂层的断裂强度最大(2880 MPa)。当x>2时,熔覆层的断裂强度随x值的增大而减小。相反,随着Si含量的增加,涂层磨损体积损失先减小后增大。当硅含量为10.56%(原子分数,即x=2)时,熔覆层的非晶含量最高(42%),抗压强度最大(2880 MPa),且干摩擦性能最好。
出处
《材料导报》
北大核心
2025年第12期156-162,共7页
Materials Reports
基金
国家自然科学基金面上项目(52275228)
国家自然科学基金青年项目(52105234,52205242)
装发教育部联合基金青年人才项目(8091B032110)。
