Transactions of Materials and Heat Treatment

Title：Effect of extrusion and aging treatment on microstructure and mechanical properties of building aluminum profiles

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ClassificationCode：TG146.2

year,vol(issue):pagenumber：2020,45(10):185-191

Abstract：

The high-strength plastic building aluminum profiles were prepared by the method of equal channel angular pressing (ECAP) and aging heat treatment, and the change laws of microstructure and mechanical properties for Al-Mg-Si alloy with ECAP + aging were studied. The results show that the average grain size of Al-Mg-Si alloy treated by ECAP at room temperature and aging and ECAP at 110-191 ℃ and aging is 102-176 nm, which is relatively small, and a lot of β″ and β′ phases of Al-Mg-Si alloy are precipitated in the process of ECAP and aging treatment. After ECAP and aging treatment, the tensile strength and the yield strength of Al-Mg-Si alloy increase compared with the solid solution and T6 states, while the elongation decreases compared with the solid solution state. With the increasing of aging temperature, the strength and elongation of ECAP+aged Al-Mg-Si alloy increase first and then decrease, the ECAP+aged sample at 110 ℃ has the highest strength and higher elongation, and the ECAP+aged sample at 170 ℃ has the highest elongation and higher strength, which are mainly related to grain refinement, dislocation strengthening and precipitation dispersion strengthening during ECAP and aging treatment.

Funds：

国家自然科学基金资助项目(51571083)；湖北省教育厅指导性项目(B2018477)

杨洁（1981-），女，硕士，副教授 E-mail：yangka512@163.com

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