1235铝合金冷加工过程中组织演变-中国材料进展

文章信息/Info

Author(s):: YU Danghui; WANG Shengning; LIU Jianxing; Aluminum Research Institute, Gansu Dongxing Aluminum Co., Ltd. of JISCO,Jiayuguan 735100, China

Keywords:: 1235 aluminum alloy; double zero foil; second phase; homogenization annealing

摘要:: 为进一步掌握铝箔坯料在冷加工过程中的组织演变规律，以1235铝合金双零箔坯料为研究对象，探究其7.0 mm厚铸轧坯料冷轧至3.8，1.8，0.9，0.5 mm过程中第二相形貌、尺寸的变化情况。结果表明，铸轧坯料冷轧一道次后均匀化退火未改变第二相的属性，只是在一定程度上改变了相的尺寸，组织内的θ相(FeAl3)会发生溶解和均匀化扩散，且在高温下部分θ析出相形貌发生了变化，长大变成针状；后在一道次冷轧至1.8 mm过程中针状相发生了明显的“折断”，但在随后的冷轧过程中，针状相被破碎至5～8 μm范围内以后再很难被进一步破碎，验证了针状第二相“硬而脆”的特性，说明在退火过程中控制尺寸＞5 μm第二相的数量的重要性。

Abstract:: In order to master the rule of microstructure evolution of aluminum double zero foil in the process of cold-rolling, the 1235 aluminum alloy foil billet was studied in this paper, the morphology and size change of the second phase of the 7.0 mm thickness cast-rolling foils during the cold working was investigated. The results showed that the homogenization annealing for the first pass rolled cast-rolling foils does not change the property of the second phase, but only changes the phase size to a certain extent, some precipitates θ(FeAl3) dissolve, the morphology of partial θ precipitates tends to grow up to needle-liked shape; and then the needle-liked structures are broken during cold rolling to 1.8 mm, the needle-liked phases are difficult to be further broken after being broken in the range of 5~8 μm, the “hard and brittle”characteristics of the needle-liked second phases is verified, and the importance of controlling the quantity of the second phase with the size larger than 5 μm during annealing is explained.