Microstructure and Tensile Properties of AA2024 Aluminum Alloy after Hot Forming with Synchronous Cooling and Aging
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摘要: 在435~505℃下对H18态AA2024铝合金板料进行同步冷却热成形，并在150~230℃下时效处理4~12 h，研究了时效后的显微组织和拉伸性能。结果表明：同步冷却热成形+时效后，试验合金中的主要强化相为Al2CuMg相；随时效温度的升高，Al2CuMg相的尺寸增大、数量变多，时效时间对该相的影响较小；试验合金的抗拉强度和屈服强度随成形温度的升高而增大，随时效温度的升高先增大后减小；在成形温度不高于475℃条件下，试验合金的抗拉强度和屈服强度随时效时间的延长呈先增大后降低的变化趋势，并在时效8 h时达到峰值，在成形温度高于475℃条件下，时效时间对合金强度的影响很小。Abstract: AA2024-H18 aluminum alloy sheet was hot formed at 435-505℃ with synchronous cooling, and then aged at 150-230℃ for 4-12 h. The microstructure and mechanical properties after aging were studied. The results show that the main strengthening phase in the test alloy after hot forming with synchronous cooling and aging was Al2CuMg. The size and quantity of Al2CuMg phase increased with the aging temperature, however, the aging time had little effect on Al2CuMg phase. The tensile strength and yield strength of the test alloy increased with the increase of the forming temperature, and increased first and then decreased with the increase of the aging temperature. When the forming temperature was not higher than 475℃, the tensile strength and yield strength of the test alloy increased first and then decreased, and reached peak values when aging for 8 h. When the forming temperature was higher than 475℃, the aging time had little influence on the strength of the alloy.
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