中文摘要：

进化在相等隧道的尖压期间在 Al-Cu 合金猛抛，坚硬变化(ECAP ) 在空间，温度被坚硬测量， X 光检查衍射分析和传播调查电子显微镜学。结果从 0 ～ 8.4 在 ECAP 期间随全部的相等的紧张的增加显示出那，有亚稳的阶段的标本的坚硬增加第一并且在以后减少时期。坚硬在包含亚稳的阶段和平衡阶段的标本连续地增加。坚硬的进化与重新溶解的机制有关，这被相信猛抛。一个批评原子核尺寸概念被提供表示三的如此的重新溶解的机制在 Al-Cu 合金猛抛。

英文摘要：

The evolution of precipitates and hardness changes in Al-Cu alloys during equal-channel angular pressing（ECAP） at room temperature were investigated by hardness measurement, X-ray diffraction analysis and transmission electron microscopy. The results show that with the increase of the total equivalent strain during ECAP from 0 to 8.4, the hardness of specimens with metastable θ″ phase increases first and decreases in later period. The hardness increases successively in specimens containing metastable θ′ phase and equilibrium θ phase. It is believed that the evolutions of hardness are related to the mechanism of re-dissolution of precipitates. A critical nuclei size concept is provided to express the mechanism of such re-dissolution of three precipitates in Al-Cu alloys.