轴向闭式辗轧成形对7050铝合金组织性能的影响-中国材料进展

文章信息/Info

Title:: Effect of Axial Closed Die Rolling on the Structure and Performance of 7050 Aluminum Alloy

作者:: 赵佳航; 王建国; 刘东; 南俊刚; 张宇; 梁郅睿; 1.西北工业大学材料学院，陕西西安 710072 2.安徽汉正航空材料有限公司，安徽宿州 234000

Author(s):: ZHAO Jiahang; WANG Jianguo; LIU Dong; NAN Jungang; ZHANG Yu; LIANG Zhirui; 1. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China 2. Anhui Hanzheng Aviation Materials Co., Ltd., Suzhou 234000, China

Keywords:: axial closed die rolling; 7050 aluminum alloy; microstructure and property; aluminum alloy thick plate

摘要:: 通过轴向闭式辗轧（ACDR）成形技术对7050铝合金进行成形加工，并进行仿真模拟，研究了ACDR对7050铝合金组织和性能的影响。结果表明，ACDR后7050铝合金厚板的应变分布为：中心＞1/2R＞边缘，成形过程中存在“蘑菇效应”。通过OM和SEM观察后发现不同位置的锻态组织存在一定差异，中心位置为等轴晶组织；1/2R处发生动态回复；边缘处组织已模糊不清，呈现纤维状。经过472 ℃×150 min固溶处理和120 ℃×400 min+160 ℃×360 min双级时效处理后分别对中心和边缘的径向和弦向试样进行常温拉伸性能测试，结果表明，ACDR后7050铝合金在中心和边缘处的屈服强度和延伸率存在一定差异，在径向和弦向两个方向力学性能差异不大。

Abstract:: After axial closed die rolling (ACDR) technology forming and simulation, the influence of ACDR on the microstructure and properties of 7050 aluminum alloy was studied. The results show that the strain distribution of 7050 aluminum alloy thick plate after ACDR is as follows: center>1/2R>edge, and mushroom effect exists in the forming process. By OM and SEM abservation, it is found that there are some differences in the forged structure at different locations. The central position is an equiaxed crystal structure, the dynamic recovery occurs at 1/2R, and the structure at the edge is blurred and shows a fibrous structure. After solution treatment at 472 ℃×150 min and dual aging treatment at 120 ℃×400 min+160 ℃×360 min, radial and chord tensile properties of the center and edge are tested at room temperature, respectively. The results show that there are some differences in the yield strength and elongation of 7050 aluminum alloy at the center and edge, and little difference in the mechanical properties of the radial and chordwise.