主轴转向对再生Al-Si-Fe-Mg合金多道次搅拌摩擦加工区组织和性能的影响  

Effect of Spindle Rotation Direction on Microstructure and Properties of Multi-pass Friction Stir Processing Zone of Al-Si-Fe-Mg Recycled Alloy

作　　者：龚航 刘厚根[2] 陈立[1] 宋斌[1] GONG Hang;LIU Hougen;CHEN Li;SONG Bin(Department of Aerospace Manufacturing Engineering,Zhangjiajie Institute of Aeronautical Engineering,Zhangjiajie 427000,China;School of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China)

机构地区：[1]张家界航空工业职业技术学院航空制造工程系,张家界427000 [2]中南大学机电工程学院,长沙410083

出　　处：《机械工程材料》2023年第9期33-40,共8页Materials For Mechanical Engineering

基　　金：湖南省自然科学基金资助项目(2020JJ7073);湖南省教育厅科研项目(20C1888)。

摘　　要：对4.5 mm厚的再生Al-7.0Si-0.85Fe-0.30Mg合金板进行相同主轴转向1~3道次和改变第2道次主轴转向2,3道次的搅拌摩擦加工,研究了主轴转向对搅拌摩擦加工区组织和力学性能的影响。结果表明:随着加工道次的增加,加工区的面积以及前进侧热机影响区的宽度增大,加工核心区的富铁相、共晶硅等第二相颗粒长度减小,圆整度提高,强度和硬度无显著改变,断后伸长率显著提高。改变第2道次主轴转向后加工区面积较相同主轴转向时减小,但组织对称性提高,前进侧热机影响区宽度减小;改变主轴转向后,第二相颗粒尺寸变化不明显,但圆整度显著降低,强度和硬度的变化也不明显,断后伸长率略有提高。The 4.5 mm thick Al-7.0Si-0.85Fe-0.30Mg recycled alloy plate was processed by friction stir for 1-3 passes with the same spindle rotation direction and for 2,3 passes by changing the second pass spindle rotation direction.The effect of spindle rotation direction on microstructure and mechanical properties of friction stir processing zone was studied.The results show that with increasing processing pass,the area of the processing zone and the width of the thermo-mechanical affected zone on the advancing side increased;the length of the second phase particles such as Fe-rich phase and eutectic silicon in the processing core area decreased,and the roundness increased;the strength and hardness had no significant change,and the percentage elongation after fracture significantly increased.After changing the second pass spindle rotation direction,the area of processing zone decreased compared with that with the same spindle rotation direction,but the microstructure symmetry was improved;the width of the thermo-mechanical affected zone on the advancing side decreased.After changing the spindle rotation direction,the second phase particle size did not change significantly,but the roundness decreased significantly;the strength and hardness did not change obviously,but the percentage elongation after fracture increased slightly.

关 键 词：搅拌摩擦加工 再生Al-Fe-Si-Mg合金 主轴转向 富铁相 拉伸性能 

分 类 号：TG146[一般工业技术—材料科学与工程]