期刊
MATERIALS
卷 16, 期 16, 页码 -出版社
MDPI
DOI: 10.3390/ma16165568
关键词
aluminum alloy; repetitive continuous extrusion forming; heat treatment; mechanical properties; microstructure
Extrusion speed has a significant influence on the extrusion temperature, microstructure, and mechanical properties of the material in the RCEF process. By adjusting the speed and applying subsequent heat treatment, the mechanical properties of Al2024 were improved. Increasing the extrusion speed from 4 to 8 rpm enhanced the extrusion temperature and solid solution function. A high-strength Al2024 with good elongation was obtained by increasing the extrusion speed and conducting solid solution and artificial aging treatments, attributed to finer grain size and a larger amount of S (Al2CuMg) precipitates.
Extrusion speed has a significant influence on the extrusion temperature, microstructure and mechanical properties of the material in the repetitive continuous extrusion forming (RCEF) process. In this work, the mechanical properties of Al2024 were improved by adjusting the speed (with a general range of 2-10 rpm) of repetitive continuous extrusion and applying subsequent heat treatment. During the RCEF process, an increase in the extrusion speed from 4 to 8 rpm was found to increase the extrusion temperature and then enhance the solid solution function. The grain size was affected by the combined effect of deformation speed and its induced temperature. A high-strength Al2024 (ultimate tensile strength of 497.6 MPa) with good elongation (12.93%) was obtained by increasing the extrusion speed and conducting solid solution and artificial aging treatments. The main strengthening mechanisms could be attributed to finer grain size and a larger amount of S (Al2CuMg) precipitates.
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