摘要
以可时效强化型7050-T451铝合金为研究对象,在24 h、160℃时效参数下设计了四因素三水平正交试验,研究了蒙皮厚度、筋条高度、筋条厚度和弯曲半径对带筋结构件回弹及力学性能的影响。通过极差分析表明,弯曲半径对回弹的影响最大,筋条高度的影响最小。随着蒙皮厚度增加、筋条高度增加、筋条厚度减小、弯曲半径减小,带筋结构件的回弹率降低。分析力学性能发现,蒙皮的屈服强度高于筋条,而布氏硬度值低于筋条。采用扫描电镜观察拉伸试样断口形貌发现,断口主要呈现韧窝型穿晶断裂特征,蒙皮断口的第二相颗粒密度和体积大于筋条,且相邻撕裂棱间距更宽。
An orthogonal experiment with four factors and three levels was conducted on age-hardenable 7050-T451 aluminum alloy at ag-ing parameters of 160℃for 24 h to investigate the effects of skin thickness,rib height,rib thickness and bending radius on the spring-back and mechanical properties of ribbed structural components.Range analysis indicates that the influence of bending radius on spring-back is the most significant,while the influence of rib height is the least.The springback rate decreases with the increase of skin thick-ness,the increase of rib height,the decrease of rib thickness and the decrease of bending radius.Mechanical property analysis reveals that the skin possesses higher yield strength but lower Brinell hardness compared to the ribs.Fracture morphology examination using scan-ning electron microscopy(SEM)demonstrates predominantly dimple-type transgranular fracture characteristics.The skin fracture displays higher density and larger volume of the second phase particles than the ribs,with wider spacing between adjacent tear ridges.
作者
滕伟杰
张坤
黄遐
沈通
曾元松
孟庆磊
TENG Wei-jie;ZHANG Kun;HUANG Xia;SHEN Tong;ZENG Yuan-song;MENG Qing-lei(AVIC Manufacturing Technology Institute,Beijing 100024,China;Shaanxi Aircraft Co.,Ltd.,Hanzhong 723213,China)
出处
《塑性工程学报》
北大核心
2025年第8期87-96,共10页
Journal of Plasticity Engineering
基金
国防基础科研计划项目(JCKY2023205B003)。
关键词
7050铝合金
蠕变时效成形
回弹
力学性能
拉伸断口
7050 aluminum alloy
creep aging forming
springback
mechanical properties
tensile fracture
作者简介
通信作者:黄遐,女,1977年生,硕士,研究员,主要从事铝合金整体壁板成形工艺技术研究,E-mail:huangxia1600@163.com;第一作者:滕伟杰,男,1998年生,硕士研究生,主要从事铝合金整体壁板成形工艺技术研究,E-mail:770743315@qq.com。
