Evolution of precipitates of Al-Cu alloy during equal-channel angular pressing at room temperature |
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| Authors: | XU Xiao-chang LIU Zhi-yi LI Yun-tao DANG Peng ZENG Su-min |
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| Affiliation: | [1]School of Materials Science and Engineering, Central South University, Changsha 410083, China; [2]Department of Mechanical Engineering, Shaoyang Institute, Shaoyang 422004, China |
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| Abstract: | 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. |
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| Keywords: | Al-Cu alloy re-dissolution ECAP precipitated phase |
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