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通过对铸态、热轧态、固溶态等不同初始组织状态的Cu4Mn6合金进行自腐蚀去合金化制备纳米多孔铜块体材料,研究了合金初始组织对去合金化过程、孔形成和孔微观结构的影响。采用XRD、SEM、EDS等分析了样品腐蚀前后的相组成、微观形貌和元素含量。结果表明,合金初始组织对去合金化过程和孔结构具有重要的影响,固溶态合金是制备成分纯净、结构均匀的纳米多孔金属的最佳前驱体。铸态和热轧态合金由于Cu元素分布不均,构成贫铜区和富铜区,不利于去合金化过程的进行,腐蚀后形成由纳米孔伴有微米孔的双级孔径结构,而固溶态合金由于其初始组织成分均匀,利于Mn元素的选择性溶解和Cu元素的重组,完成去合金化所需时间最短,Mn残留量最低,去合金化后可形成孔径均匀的三维连通纳米多孔结构。
Self-descaling of Cu4Mn6 alloy with different initial microstructures, such as as-cast, hot-rolled and solid-solution state, was used to prepare nanoporous copper block. The effect of initial alloy microstructure on de-alloying process, pore formation and pore microstructure Effect of structure. The phase composition, microstructure and elemental content before and after the sample were analyzed by XRD, SEM and EDS. The results show that the initial structure of the alloy has an important influence on the de-alloying process and the pore structure. The solid-solution alloy is the best precursor for preparing nano-porous metal with pure composition and uniform structure. Due to the uneven distribution of Cu elements in the as-cast and hot-rolled alloys, the copper-poor areas and the copper-rich areas are not conducive to the de-alloying process. After etching, the two-level pore structure with nanopores along with the micropores is formed, Due to the uniform initial microstructure of the dissolved alloy, which facilitates the selective dissolution of Mn and the reorganization of Cu, the time required to complete the de-alloying is the shortest, and the residual Mn is the lowest. After de-alloying, the three-dimensionally connected nanopores structure.