喷射成形7055铝合金的显微组织和力学性能_李先聚.pdf

第 17 卷第 12 期 中国有色金属学报 2007 年 12 月 Vol.17 No.12 The Chinese Journal of Nonferrous Metals Dec. 2007 文章编号：1004-0609(2007)12-1987-06 喷射成形 7055 铝合金的显微组织和力学性能 李先聚，杨 杰，张 豪，张 捷，张 荻 (上海交通大学 金属基复合材料国家重点实验室，上海 200030) 摘 要：采用全自动控制往复喷射成形工艺制备了 7055 铝合金的大规格喷射成形锭坯。通过显微组织分析和力 学性能测试，研究工业规格喷射成形 7055 铝合金的初始组织、挤压工艺及热处理制度对显微组织和力学性能的 影响。结果表明，喷射成形 7055 铝合金锭坯规格可达 d 260 mm ×1600 mm，晶粒为等轴状，粒度宏观均匀，主 要在 20~30 µm，组织无明显宏观偏析，锭坯致密度达到 98.2 %。喷射成形态材料的T6 态 σb 为 500~543 MPa，显 示控制往复喷射成形铝合金锭坯冶金质量优越。喷射成形锭坯经过小挤压比变形后达到全致密，大规格产品的 T6 态纵向 σb 提高到 745 MPa，δ为 12.8 %。 关键词：7055 铝合金；喷射成形；热处理；显微组织；力学性能 中图分类号：TG 146.2 文献标识码：A Microstructure and mechanical properties of 7055 Al alloys by spray forming LI Xian-ju, YANG Jie, ZHANG Hao, ZHANG Jie, ZHANG Di (State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200030, China) Abstract: A large-scale 7055 Al alloy billet with a size of d 260 mm ×1600 mm was prepared by fully automatic controlled reciprocating spray forming technology. The initial microstructure and the effect of subsequent treatment (including extrusion and heat treatment) on the microstructures and mechanical properties of the 7055 alloy were studied. The results show that the as-deposited billet has an equiaxed and homogeneous structure with a grain size of 20−30 µm and no macro-segregation structure. The relative density of the as-deposited alloy gets up to 98.2%. The ultimate tensile strength of as-deposited materials after T6 heat treatment gets up to 500−543 MPa, which indicates that there is little