中文摘要：

2024aluminum 合金的变硬年龄的特征上的大冷变丑的效果被调查。结果揭示：1 ) 变老的反应在大冷变丑以后被加速，并且山峰力量为 40 min 在老化以后被达到；2 ) 两倍变老的山峰能在变硬年龄的曲线被发现，并且当年老时，第一座山峰为 40 min 出现。张力的力量(sigma_b ) 和延伸直到 580 MPa 的 Thecorresponding 山峰并且 9.2% 分别地，当年老时，第二座山峰为张力的力量(520 MPa ) 是的 120 min，而是山峰出现比第一低；3 ) 在老化(【40 min ) 的早舞台，延伸稍微与延长合金的老化时间从 8% 增加。延伸显著地为 60 min 在老化以后减少到 2% ，并且与在 age-elongationcurve 上延长老化时间显示出一个高原。大变丑介绍的脱臼的高密度加速 GP 地区的降水和合金的变老的反应，这被显示。首先变老的山峰由于 GP 地区的形成，加强的变丑由脱臼的高密度引起。并且在变老的曲线在场的第二座山峰被归因于 S 的成核和生长“阶段。在脱臼密度减少和降水 S 之间的偏移量“当年老时， -phasefinally 在 190 deg C 导致两倍变老的山峰的现象。而且， PFZ 的形成和粗糙的平衡阶段由降水 ofS 伴随了，这被建议“阶段减少延伸。

英文摘要：

Effect of large cold deformation on the age-hardening characteristics of 2024 aluminum alloys was investigated. The results reveal： 1） the aging response is accelerated after large cold deformation, and the peak strength is attained after aging for 40 rain; 2） double aging peaks can be found in the age-hardening curves, and the first peak appears when aged for 40 min. The corresponding peak tensile strength （σb） and elongation are up to 580 MPa and 9.2% respectively, the second peak appears when aged for 120 min, but the peak tensile strength （520 MPa） is lower than the first one; 3） in early stage of aging （〈40 min）, elongation slightly increases from 8% with prolonging aging time of the alloy. Elongation markedly decreases to 2% after aging for 60 rain, and shows a plateau with the prolonging of aging time on the age-elongation curve. It is indicated that the high density of dislocation introduced by large deformation accelerates the precipitation of GP zones and the aging response of the alloy. The first aging peak is due to the formation of GP zones and the deformation strengthening caused by the high density of dislocation. And the second peak present in the aging curve is attributed to the nucleation and growth of S＇ phase. The offset between dislocation density decreases and precipitation S＇-phase finally results in the phenomenon of double aging peaks when aged at 190 ℃ Moreover, it is suggested that the formation of PFZ and coarse equilibrium phase accompanied by the precipitation of S＇ phase decrease the elongation.