等离子熔覆CoCrCuFeNiMn高熵合金组织研究  

Microstructure Characterization of CoCrCuFeNiMn High Entropy Alloys by Plasma Cladding

作　　者：王智慧[1] 王虎[1] 贺定勇[1] 崔丽[1] 蒋建敏[1] 周正[1] 赵秋颖[1] 

机构地区：[1]北京工业大学,北京100124

出　　处：《稀有金属材料与工程》2015年第3期644-648,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51275010)

摘　　要：采用等离子熔覆技术在Q235钢基体上制备了fcc结构的Co Cr Cu Fe Ni Mn高熵合金熔覆层,并研究了熔覆层的组织结构以及合金元素在基体中的扩散。结果发现,熔覆层显微组织为树枝晶,枝晶间为富Cu面心立方固溶体,晶格常数为0.3597 nm,有纳米编织组织析出。枝晶内为多种元素固溶的面心立方固溶体,晶格常数为0.3664 nm。高熵组元元素在熔合线靠近热影响区一侧形成元素的过渡区,过渡区宽度约为10μm。临近熔合线的热影响区内出现了大约70μm宽的铁素体带,该区域的珠光体因脱碳分解生成铁素体,Co在该区域扩散的距离最远。Co Cr Cu Fe Ni Mn high entropy alloy cladding layer of the face-centered cubic structure was prepared on Q235 steel by a plasma cladding technique. The microstructure of the cladding layer and diffusion of alloying elements in base metal were investigated. The results show that the microstructure of the cladding layer is dendrite structure. Interdendrite is Cu enriched face-centered cubic solid solution with lattice parameter of 0.3597 nm. The nano knitting structure is deposited in the interdendrite. The face-centered cubic solid solution with a variety of elements is formed in the dendrite and the lattice parameter is 3.664 nm. A transition zone of element about 10 μm width is formed at HAZ near fusion line. A ferrite band appears at HAZ near the fusion line which is caused by decarburizing of pearlite. The diffusion distance of Co is the furthest in the transition zone.

关 键 词：等离子熔覆 高熵合金 熔覆层 显微组织 

分 类 号：TG174.4[金属学及工艺—金属表面处理]