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Precipitation behavior and properties of extruded 7136 aluminum alloy under different aging treatments

Chinese Journal of Aeronautics 2021年第2期34卷 612-619页

作者： Huiyan LI Lina JIA Jiangnan HUANG Yue MA School of Materials Science and Engineering Beihang UniversityBeijing 100083China

In this work, the mechanical properties and electrical conductivity of the extruded 7136 aluminum alloy treated by single-stage aging treatment(T6), retrogression and re-aging treatment(RRA), and multiple retrogression and re-aging treatment have been investigated by means of hardness measurements, electrical conductivity tests and tensile tests. The results have shown that the properties of the 7136 alloy such as hardness, tensile strength and electrical conductivity were sensitive to retrogression time(within 90 min). With prolonging the retrogression time, the tensile strength was enhanced first and then decreased, yet the electrical conductivity was continuously increased. The 60 min-treated alloy performed the highest tensile strength(716 MPa), whereas the 90 min-treated alloy possessed the highest electrical conductivity(33.95%IACS). Compared with the T6-treated alloy, the tensile strength and electrical conductivity were improved by 3.3%and 18.9%, respectively. The electrical conductivity showed an obvious increase with repetitious times of the RRA treatment. After 3 RRA60 treatment, a good combination of tensile strength(705 MPa) and electrical conductivity(33.20%IACS) can be obtained. Compared with the T6 condition, the tensile strength and electrical conductivity were improved by 1.7% and 16.3%, respectively. The mechanism of microstructure evolution under different aging treatments has been discussed in detail.

关键词： 7136 aluminum alloy Electrical conductivity Mechanical properties Microstructure Retrogression and re-aging

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Microstructure of as-extruded 7136 aluminum alloy and its evolution during solution treatment

引用

Rare Metals 2017年第4期36卷 256-262页

作者： Yun-Qiang Fan Kai Wen Zhi-Hui Li Xi-Wu Li Yong-An Zhang Bai-Qing Xiong Jian-Xin Xie State Key Laboratory of Nonferrous Metals and Processes General Research Institute for Nonferrous Metals State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing

With the aid of scanning electron microscopy （SEM）, energy-dispersive spectroscopy （EDS）, X-ray diffraction （XRD）, differential scanning calorimetry （DSC） analysis and electron backscatter diffraction （EBSD）, the microstructure of the alloy in as-extruded state and various solution-treated states was investigated. The results indi- cate that second phase of the as-extruded 7136 aluminum alloy mainly consists of Mg（Zn, Cu, Al）2 and Fe-rich phases. The Mg（Zn, Cu, Al）2 phase directly dissolves into the matrix during solution treatment with various solution temperatures. After solution treated at 475℃ for 1 h, Mg（Zn, Cu, Al）2 phases are dissolved into the matrix, while Fe-rich phases still exist. Fe-rich phases could not dissolve into the matrix by prolonging solution time. The mechanical property test and EBSD observation show that two-stage solution treatment makes no significant improvement in mechanical properties and recrystallization of the alloy. The optimized solution treatment parameter is chosen as 475 ℃/1 h.

关键词： 7136 aluminum alloy Microstructure Solution treatment Tensile property

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