Transactions of Materials and Heat Treatment

Title：Influence of regression and double-stage re-aging process on microstructure and properties for 7050 aluminum alloy ring forgings

Authors： Xiang Biao1 Xie Linjun2 Zhang Peng1 Yuan Wuhua2

Unit： 1. China National Erzhong Group Deyang Wanhang Die Forging Co. Ltd. 2. Hunan University

KeyWords： 7050 aluminum alloy ring forgings regression and double-stage re-aging grain size precipitated phase mechanical properties

ClassificationCode：TG146.21;TG156.92

year,vol(issue):pagenumber：2023,48(2):210-214

Abstract：

For 7050 aluminum alloy ring forgings, combined with electron backscatter diffraction, transmission electron microscope, scanning electron microscope and tensile test at room temperature, the influences of regression and double-stage re-aging (RDSRA) process on the microstructure and tensile properties in the axial, circumferential and radial directions for 7050 aluminum alloy ring forgings were investigated, and the precipitated phase distribution, tensile properties of forgings and fracture mechanisms of forgings after RDSRA process treatment were analyzed. The results show that the yield strength, fracture strength and elongation of 7050 aluminum alloy ring forgings after RDSRA are greater than 550 MPa, 590 MPa, and 7%, respectively. In addition, the precipitated phases are mainly η′ and η, and the radial direction precipitated phase size of forgings is significantly larger than that of the axial and circumferential directions, resulting in higher yield strength and elongation in the axial and circumferential directions than that in the radial direction of forgings. Compared with the regression and single-stage re-aging process, the RDSRA process can maintain the good tensile mechanical properties of forgings in the axial, circumferential and radial directions under the condition of shortened re-aging time.

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作者简介：向彪（1975-），男，学士，E-mail： b-xiang@163.com

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