摘要
对不同锰含量(0,0.1%,0.4%,0.7%,质量分数)Al-Mg-Si-Cu合金板(510℃固溶+195℃时效处理)进行搅拌摩擦焊接试验,研究了锰含量对接头显微组织及拉伸性能的影响。结果表明:不同锰含量接头焊核区经历连续动态再结晶与几何动态再结晶的共同作用,形成大量细小再结晶晶粒,锯齿状晶粒被拉长分割;随锰含量增加,焊核区平均晶粒尺寸先增大后减小,接头中的析出相数量增加,当锰质量分数为0.7%时,析出相发生粗化。不同锰含量接头焊核区形成A/A和C型剪切织构。随锰含量增加,接头的抗拉强度先升高后下降,断后伸长率先降低后升高,当锰质量分数为0.4%时,接头的抗拉强度最高,断后伸长率最小。含锰合金接头断口存在密集韧窝,断裂形式为韧性断裂;随锰含量增加,韧窝尺寸增大。
Friction stir welding tests were carried out on Al-Mg-Si-Cu alloys with different Mn content(0,0.1%,0.4%,0.7%,mass fraction);the alloys were treated by solution at 510℃and aging at 195℃.The effect of Mn content on microstructure and tensile properties of the joints were studied.The results show that the nugget zone of the joint with different Mn content underwent the combined effect of continuous dynamic recrystallization and geometric dynamic recrystallization,forming a large number of fine recrystallized grains,and the serrated grains were elongated and divided.With the increase of Mn content,the average grain size in nugget zone increased and then decreased,and the number of precipitates in the joint increased.When the mass fraction of Mn was 0.7%,precipitates coarsened.A/A and C-type shear textures were formed in the nugget zone of joint with different Mn content.The tensile strength of the joint increased first and then decreased with the increase of Mn content,and the elongation after fracture decreased first and then increased.When Mn mass fraction was 0.4%,the tensile strength of the joint was the highest and the elongation after fracture was the smallest.There were dense dimples in the fracture of the joint with Mn,and the fracture mode was ductile fracture.With the increase of Mn content,the size of dimples increased.
作者
宋锦江
孙有平
李旺珍
何兴
罗章
陈文刚
SONG Jinjiang;SUN Youping;LI Wangzhen;HE Xing;LUO Zhang;CHEN Wengang(School of Mechanical and Automotive Engineering,Guangxi University of Science and Technology,Liuzhou 545006,China;Guangxi Earthmoving Machinery Collaborative Innovation Center,Guangxi University of Science and Technology,Liuzhou 545006,China;Guangxi Key Laboratory of Automobile Components and Vehicle Technology,Guangxi University of Science and Technology,Liuzhou 545006,China;Xi'an Baoguang Intelligent Electrical Co.,Ltd.,Xi'an 710016,China;Dongfeng Liuzhou Automobile Co.,Ltd.,Liuzhou 545006,China)
出处
《机械工程材料》
北大核心
2025年第8期19-26,共8页
Materials For Mechanical Engineering
基金
广西重点研发计划项目(桂科AB23026104)
柳州市科技计划项目(2023PRJ0102)
广西高校中青年教师科研基础能力提升项目(2022KY0351)。
关键词
搅拌摩擦焊
铝合金
锰含量
织构
拉伸性能
fricition stir welding
aluminum alloy
Mn content
texture
tensile property
作者简介
宋锦江(1999-),男,陕西西安人,硕士研究生;通信作者:孙有平,导师,教授。
