| Improved creep aging response in Al-Cu alloy by applying pre-aging before pre-straining |
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| 作者姓名： | Fangpu LYU Chunhui LIU Peipei MA Jianshi YANG Longhui CHEN Lihua ZHAN Minghui HUANG |
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| 作者单位： | 1. State Key Laboratory of Precision Manufacturing for Extreme Service Performance, School of Mechanical and Electrical Engineering, Central South University;2. Light Alloy Research Institute, Central South University;3. Advanced Research Center, Central South University |
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| 基金项目： | the financial support from the National Natural Science Foundation of China (Nos. 52274404, U2032117, U22A20190)；;Natural Science Foundation of Hunan Province, China (No. 2022JJ20065)；;the National Key Research and Development Program of China (No. 2021YFB3400903)； |
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| 摘 要： | The improvement of post-form properties without compromising creep formability has been a critical issue in creep age forming of aluminum alloy component. A pretreatment process incorporating artificial pre-aging at 165 °C for 6 h/12 h/24 h followed by pre-strain(3%–9%)has been developed. This method not only evidently improves the strength but also accelerates the creep deformation during creep aging of an Al-Cu alloy. A strength increase of 50 MPa with a slight decrease of ductility relative t...
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| 收稿时间： | 19 June 2022 |
Improved creep aging response in Al-Cu alloy by applying pre-aging before pre-straining |
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| Fangpu LYU,Chunhui LIU,Peipei MA,Jianshi YANG,Longhui CHEN,Lihua ZHAN,Minghui HUANG.Improved creep aging response in Al-Cu alloy by applying pre-aging before pre-straining[J].Chinese Journal of Aeronautics,2023,36(7):518-530. |
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| Institution: | 1. State Key Laboratory of Precision Manufacturing for Extreme Service Performance, School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;2. Light Alloy Research Institute, Central South University, Changsha 410083, China;3. Advanced Research Center, Central South University, Changsha 410083, China |
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| Abstract: | The improvement of post-form properties without compromising creep formability has been a critical issue in creep age forming of aluminum alloy component. A pretreatment process incorporating artificial pre-aging at 165 °C for 6 h/12 h/24 h followed by pre-strain (3%–9%) has been developed. This method not only evidently improves the strength but also accelerates the creep deformation during creep aging of an Al-Cu alloy. A strength increase of 50 MPa with a slight decrease of ductility relative to the 9% pre-strained alloy is acquired in the alloy artificially pre-aged for 24 h regardless of the pre-strain level (3%–9%). Artificial aging for 24 h prior to 3% pre-strain enables an increase of creep strain by 30%. The creep strain in the alloy artificially pre-aged for 24 h and pre-strained by 6% is comparable to that in the alloy pre-strained by 9%. The strength and ductility in the alloy artificially pre-aged for 6 h/12 h and pre-strained by 3% are even slightly higher than those in the alloy purely pre-strained by 9%. The characterizations by transmission electron microscopy reveal that pre-aging at 165 °C could promote the accumulation of dislocations during pre-straining due to the pinning effect of pre-existing Guinier-Preston zones (GP zones)/θ″ phases and thus expedite the creep deformation in respect to the pure pre-straining treatment. The enhanced precipitation of θ′ phases at these pinned dislocations contributes to the improved strength after creep aging. The results demonstrate applying artificial pre-aging before pre-straining is an efficient strategy to elevate the creep aging response in Al alloys. |
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| Keywords: | Al-Cu alloy Creep aging Pre-aging Precipitation Pre-strain |
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