Cu含量对Al-1Mg-0.6Si-xCu合金板材韧性及弯曲性能的影响  

Effects of Cu content on toughness and bendability of Al-1Mg-0.6Si-xCu alloy sheet

作　　者：欧阳瑞丁 赵磊 蒋海春 唐建国[1,2] 叶凌英[1,2] 刘胜胆[1,2] 张勇[1,2] 马乐航[1,2] 胡西艳 卢冯恺 OUYANG Ruiding;ZHAO Lei;JIANG Haichun;TANG Jianguo;YE Lingying;LIU Shengdan;ZHANG Yong;MA Lehang;HU Xiyan;LU Fengkai(School of Materials Science and Engineering,Central South University,Changsha 410083,China;Key Laboratory of Non-ferrous Materials Science and Engineering,Ministry of Education,Central South University,Changsha 410083,China;Beijing Satellite Manufacturing y Co.,Ltd.,Beijing 100089,China;MINTH Research and Development Center,Ningbo 315800,China)

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学有色金属材料科学与工程教育部重点实验室,长沙410083 [3]北京卫星制造厂有限公司,北京100089 [4]敏实集团研发中心,宁波315800

出　　处：《中国有色金属学报》2024年第5期1486-1494,共9页The Chinese Journal of Nonferrous Metals

基　　金：国家重点研发计划资助项目(2023YFB3710400)。

摘　　要：采用室温拉伸、Kahn撕裂以及弯曲实验,结合数字图像分析法和扫描透射电镜等手段,探究了Cu含量对Al-1Mg-0.6Si-xCu合金板材韧性及弯曲性能的影响。结果表明:随着Cu含量的增加,合金的伸长率、均匀伸长率、均匀断裂能和单位面积裂纹形核功逐渐增加,合金的弯曲性能变好,均匀阶段韧性提升,而合金的失稳伸长率、失稳断裂能及单位面积裂纹扩展功下降,合金失稳阶段韧性变差。随着Cu含量的增加,Al-1Mg-0.6Si-xCu合金中强化相β″的密度增加,且在0.5-Cu合金中出现Q′相和L相,晶内析出相密度增加,使得合金在形变过程中消耗的能量增加;晶界析出相间距增加,从而提高合金的韧性及弯曲性能。The effects of Cu content on the toughness and bendability of Al-1Mg-0.6Si-xCu alloy sheet were investigated by means of tensile testing,Kahn tearing and bending experiments,in conjunction with digital image correlation analysis(DIC)and scanning transmission electron microscopy(STEM).The results show that with the increase of Cu content,the elongation,uniform elongation,uniform fracture energy and unit initiation energy(UIE)of the alloys gradually increase.The bendability of the alloy is improved,and the toughness during the uniform stage is enhanced.Conversely,the buckling elongation,buckling fracture energy and unit propagation energy(UPE)of the alloys decrease with higher Cu contents,leading to deteriorated buckling toughness of the alloys.As Cu content in the Al-1Mg-0.6Si-xCu alloy increases,the nucleation sites of the strengthening phaseβ″increases,and the Q′and L phases appear in 0.5-Cu alloy.The increasing density of matrix precipitates raises the energy consumption during deformation,while the increased spacing between grain boundary precipitates improves the toughness and bendability of the alloy.

关 键 词：AL-MG-SI-CU合金 CU含量 失稳伸长率 裂纹形核功 裂纹扩展功 弯曲性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]