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采用拉伸性能测试、显微硬度测试、扫描电镜和透射电镜观察等手段,研究了不同时效温度对50%冷变形2519A铝合金组织和力学性能的影响。结果表明:采用较大变形程度(50%)冷轧,再进行低温较长时间时效(140℃×6 h),可使2519A铝合金的强度得到显著提高(σb=551 MPa),同时其伸长率不低于7%;经冷变形的2519A铝合金,在稍高温度短时间(190℃×2 h)时效处理,将导致时效强化能力降低,但仍不低于常规时效处理(T6态:170℃×13 h)。
The effects of aging temperature on the microstructure and mechanical properties of 50% cold deformed 2519A aluminum alloy were investigated by tensile test, microhardness test, scanning electron microscopy and transmission electron microscopy. The results show that the strength of 2519A aluminum alloy can be significantly enhanced (σb = 551 MPa) by cold rolling with larger deformation (50%) and longer aging at 140 ℃ for 6 h (σb = 551 MPa) The results showed that the aging of 2519A aluminum alloy with cold deformation at 190 ℃ × 2 h for a short time (190 ℃ × 2 h) resulted in a decrease of aging strengthening ability, but not less than that of conventional aging treatment (T6 state : 170 ° C × 13 h).