| Effects of RRA Treatments on Microstructures and Properties of a New High-strength Aluminum-Lithium Alloy-2A97 |
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| 作者姓名： | YUAN Zhi-shan LU Zheng XIE You-hua DAI Sheng-long LIU Chang-sheng |
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| 作者单位： | [1]School of Materials ＆ Metallurgy, Northeastern University, Shenyang 110004, China [2]Beijing Institute of Aeronautical Materials, Beijing 100095, China |
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| 基金项目： | 国家重点基础研究发展计划(973计划) |
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| 摘 要： | A new high strength 2A97 Al-Cu-Li-X alloy was subjected to triple-aging of retrogression and re-aging treatments (RRA). Transmission electron microscopy (TEM), differential scanning calorimetry (DSC), and tensile tests were used to investigate the effects of RRA treatment on the microstructures and properties. DSC test reveals the reversion temperature range of the strengthening δ' (Al3Li)phase. The results show that the microstructure consists of δ' (Al3Li) phase, T1 (Al2CuLi) phase and θ"/θ'(Al2Cu) phase for 2A97 alloy treated by a triple-aging ora retrogression and re-aging treatment in the following order: (1) at 165 ℃×30 min, (2) at 220 ℃ or 240 ℃×15 min, (3) at 165 ℃×24 h. The plastic deformation, incorporated into the treatment after secondary high temperature aging, promotes the T1 precipitation during final re-aging. The tensile properties of the alloy treated by the retrogression and re-aging treatment reach the peak level of alloy single-aged at 165 ℃ in T6 temper.
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| 关 键 词： | 显微结构 铝铜锂合金 反转作用 材料学 |
| 收稿时间： | 10 August 2006 |
| 修稿时间： | 2006-08-102006-11-24 |
Effects of RRA Treatments on Microstructures and Properties of a New High-strength Aluminum-Lithium Alloy-2A97 |
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| YUAN Zhi-shan LU Zheng XIE You-hua DAI Sheng-long LIU Chang-sheng.Effects of RRA Treatments on Microstructures and Properties of a New High-strength Aluminum-Lithium Alloy-2A97[J].Chinese Journal of Aeronautics,2007,20(2):187-192. |
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| Authors: | YUAN Zhi-shan LU Zheng XIE You-hua DAI Sheng-long LIU Chang-sheng |
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| Institution: | 1. School of Materials & Metallurgy, Northeastern University, Shenyang 110004, China;2. Beijing Institute of Aeronautical Materials, Beijing 100095, China |
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| Abstract: | A new high strength 2A97 Al-Cu-Li-X alloy was subjected to triple-aging of retrogression and re-aging treatments (RRA). Transmission electron microscopy (TEM), differential scanning calorimetry (DSC), and tensile tests were used to investigate the effects of RRA treatment on the microstructures and properties. DSC test reveals the reversion temperature range of the strengthening δ' (Al3Li) phase. The results show that the microstructure consists of δ' (Al3Li) phase, T1 (Al2CuLi) phase and θ″/θ'(Al2Cu) phase for 2A97 alloy treated by a triple-aging of a retrogression and re-aging treatment in the following order: (1) at 165 °C× 30 min, (2) at 220 °C or 240 ° × 15 min, (3) at 165 °C× 24 h. The plastic deformation, incorporated into the treatment after secondary high temperature aging, promotes the T1 precipitation during final re-aging. The tensile properties of the alloy treated by the retrogression and re-aging treatment reach the peak level of alloy single-aged at 165 °C in T6 temper. |
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| Keywords: | 2A97 Al-Cu-Li-X alloy RRA treatments triple aging microstructure reversion Microstructures and Properties high temperature aging tensile properties reach peak level precipitation during final secondary plastic deformation order results show microstructure phase tensile tests reversion range strengthening |
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