Si对高熵合金涂层组织和高温抗氧化性能的影响  

Effect of Si on microstructure and high temperature oxidation resistance of high-entropy alloy coatings

作　　者：马植甄[1] 朱佳浩 张晖[2] Ma Zhizhen;Zhu Jiahao;Zhang Hui(Technology Center,Shanghai Meishan Iron&Steel Co.,Ltd.,Nanjing Jiangsu 210039,China;School of Materials Science and Engineering,Anhui University of Technology,Ma'anshan Anhui 243002,China)

机构地区：[1]上海梅山钢铁股份有限公司技术中心,江苏南京210039 [2]安徽工业大学材料科学与工程学院,安徽马鞍山243002

出　　处：《金属热处理》2021年第8期46-50,共5页Heat Treatment of Metals

基　　金：国家自然科学基金(51971001)。

摘　　要：研究了Si含量对窄带/宽带激光熔覆NiCoFeCrSi_(x)AlCuTiMoB_(0.4)(x=1.0,0.5)高熵合金涂层组织、相结构及高温抗氧化性能的影响。结果表明:窄带涂层组织为树枝晶,主要相结构为BCC固溶体。宽带涂层为较粗大的树枝晶,相结构由BCC固溶体和存在于枝晶间的B(Fe,Si)_(3)、Cr_(2)B少量第二相组成,且Si元素的减少使得涂层中的B(Fe,Si)_(3)第二相含量减少。宽带涂层经800℃氧化50 h后氧化产物截面主要由富Cr的外氧化层和富Al的内氧化层组成,Si元素含量的增加提高了涂层的抗高温氧化性能,特别是显著降低了内氧化层厚度。Effect of Si content on microstructure,phase structure and high temperature oxidation resistance of the narrowband/broadband laser clad NiCoFeCrSi_(x)AlCuTiMoB_(0.4)(x=1.0,0.5)high-entropy alloy coatings was studied.The results show that the narrowband clad coating is mainly composed of simple BCC solid solution with dendritic microstructure.In the broadband coating,the phases transform to BCC solid solution with a small amount of B(Fe,Si)_(3)and Cr_(2)B precipitates which are between dendrites,and the content of B(Fe,Si)_(3)reduces with the decrease of Si content.After oxidizing at 800℃for 50 h,the oxidation scale of the broadband clad coating is mainly composed of Cr-rich outer oxide layer and Al-rich inner oxide layer,and the increase of Si content improves the high temperature oxidation resistance of the coating,especially significantly reduces the thickness of internal oxide layer.

关 键 词：激光熔覆 高熵合金 组织 氧化层 

分 类 号：TG174[金属学及工艺—金属表面处理]