Transactions of Materials and Heat Treatment

Title：Rolling deformation and microstructure properties on 7050 aluminum alloy under different rolling deformation amounts

Authors： Zhou Xiaoping1 Tian Zhuangzhuang1 Liu Yufen2

Unit： 1.School of Telecommunications and Intelligent Manufacturing Zhengzhou Sias University 2.School of Materials Science and Engineering Henan University of Science and Technology

KeyWords： 7050 aluminum alloy extrusion state rolling deformation amount phase composition microstructure mechanical properties

ClassificationCode：TG146.21; TG156.92

year,vol(issue):pagenumber：2024,49(8):80-87

Abstract：

The influences of rolling deformation amount (25%-75%) on the phase composition, microstructure and mechanical properties of 7050 aluminum alloy were studied by X-ray diffraction analyzer, optical microscope, scanning electron microscope and tensile testing machine. The results show that the as-extruded 7050 aluminum alloy and rolled 7050 aluminum alloy with the rolling deformation amount of 25%-75% are mainly composed of α-Al phase, MgZn2 phase and Al2MgCu phase. As the rolling deformation amount increases from 25% to 75%, the microhardness, tensile strength and yield strength of 7050 aluminum alloy in three directions first increase and then decrease, and the maximum hardness value is achieved at the rolling deformation amount of 55%. At this time, 7050 aluminum alloy has a large elongation after fracture, which is mainly related to the smaller recrystallized grains, MgZn2 phase and Al2MgCu phase, higher dislocation density, and the presence of cellular substructures in 7050 aluminum alloy at the rolling deformation amount of 55%. When the rolling deformation amount increases to 75%, the grain coarsening and growth occur, at the same time,the dislocation density in the matrix structure decreases, resulting in a decrease in micro hardness and strength.

Funds：

河南省科技攻关计划项目（222102210282）

作者简介：周晓平（1984-），女，硕士，副教授 E-mail：vvdtop@163.com

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