焊管2024，Vol.47Issue(12)：44-51,8.DOI:10.19291/j.cnki.1001-3938.2024.12.007
搅拌摩擦加工对7075铝合金微观组织和力学性能的影响
Effect of Friction Stir Processing on Microstructure and Mechanical Properties of 7075 Aluminum Alloy
摘要
Abstract
In order to improve the surface strength of 7075 aluminum alloy and make high-strength ultra-fine crystal aluminum alloy material,the microstructure of 7075 aluminum alloy was optimized by friction stir processing(FSP).The microstructure was quantitatively characterized by scanning electron microscopy(SEM)and electron backscatter diffraction(EBSD),and the influence mechanism of microstructure on mechanical properties was revealed.Results show that after FSP,grain size of material changes from strip shape to fine and uniform equiaural crystal,especially for sample due to sufficient recrystallization(95%of the recrystallization grains),grain size is the smallest,reaching 0.66 μm.Tensile strength of 7075 aluminum alloy after FSP increased first and then decreased,and reached the maximum value(537 MPa)in processed sample.Plasticity of aluminum alloy after FSP is significantly higher than that of base material,and processing sample produces grain boundary slip to coordinate plastic deformation through ultra-fine crystals,resulting in optimal plasticity,which increases by 83.3%compared with sample.Research results can provide technical reference for the preparation of high strength ultrafine materials.关键词
7075铝合金/搅拌摩擦加工/微观结构/力学性能/再结晶Key words
7075 aluminum alloy/friction stir processing/microstructure/mechanical properties/recrystallization分类
矿业与冶金引用本文复制引用
潘胜善,杨炳元,袁晓红,龙绍檑,桂琴,陈延益,蔡杰,杨艳菲,赵慧芳..搅拌摩擦加工对7075铝合金微观组织和力学性能的影响[J].焊管,2024,47(12):44-51,8.基金项目
贵州省基础研究计划(自然科学类)项目"共晶型难熔高熵合金涂层激光-感应复合熔覆增材制造及其高温摩擦行为研究"(项目编号黔科合基础-ZK[2024]一般516) （自然科学类）
贵州省基础研究计划(自然科学类)项目"有效变形体积与高强钢多层次组织的复合关系及对塑韧性的控制研究"(项目编号黔科合基础[2020]1Y199). （自然科学类）
