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用Zr-4合金的大晶粒样品在360℃/18.6 MPa的0.01 mol/L LiOH水溶液中进行5 h的腐蚀实验,借助SEM,EBSD和HRTEM等分析方法,研究了腐蚀初期氧化膜生长的各向异性、显微组织和氧化物结构.氧化膜的厚度因基体表面晶粒取向不同而有差异(376-455nm),在基面(0001)和棱柱面(01(?)0)附近晶面上生长的氧化膜最厚;氧化膜由单斜、立方和四方结构的氧化物组成;氧化膜的结构和晶粒取向分布也随基体晶粒取向不同而存在差异,在(0001)附近晶面上生成的氧化膜中氧化物结构种类较多、晶粒取向差别较大,这种氧化膜的显微组织在腐蚀过程中可促使氧化膜更快生长.
Large-grain samples of Zr-4 alloy were subjected to a corrosion test in 0.01 mol / L LiOH solution at 360 ° C / 18.6 MPa for 5 h. SEM, EBSD and HRTEM were used to study the corrosion resistance Anisotropy, microstructure and oxide structure.The thickness of the oxide film is different due to the different crystal orientation of the substrate surface (376-455nm), the surface of the oxide film (0001) and the prism surface (01 (?) 0) crystal plane The oxide film is composed of oxide of monoclinic, cubic and tetragonal structure. The structure and grain orientation distribution of the oxide film also vary with the orientation of the matrix grains. In the vicinity of the (0001) crystal plane Oxide oxide film formed on the type of structure more, the larger the grain orientation, the oxide film of the microstructure in the erosion process can promote the oxide film faster growth.