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Effects of pre-deformation mode and strain on creep aging bend-forming process of Al-Cu-Li alloy 被引量:6
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作者 Jian-guo TANG Bo YU +2 位作者 Jin ZHANG Fu-shun XU Chong-jun BAO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第5期1227-1237,共11页
The bending deformation method was adopted to characterize the creep deformation behavior of Al-Cu-Li alloy in the creep aging forming(CAF) process based on a series of CAF tests, and the evolution laws of its mechani... The bending deformation method was adopted to characterize the creep deformation behavior of Al-Cu-Li alloy in the creep aging forming(CAF) process based on a series of CAF tests, and the evolution laws of its mechanical properties and microstructures under different pre-deformation conditions were studied. The results show that the bending creep strain characterization method can intuitively describe the creep variation. With the increase of the pre-deformation strain, the creep strain of the specimen firstly increases and then decreases. The increase of the pre-deformation strain can promote the course of aging precipitation, and improve the formed alloy’s tensile properties at room temperature, the Kahn tearing properties, and the fatigue propagation properties. Pre-rolled specimens produce a slightly weaker work hardening than pre-stretched specimens, but they also create a stronger aging-strengthening effect;thus the strength, toughness and damage performance can be improved to some extent. Among all the types of specimens, the specimen with 3% rolling after CAF treatment has the best comprehensive mechanical properties. 展开更多
关键词 Al-Cu-Li alloy creep aging forming PRE-DEFORMATION bending creep strain microstructure evolution mechanical properties
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Creep aging behavior of retrogression and re-aged 7150 aluminum alloy 被引量:7
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作者 Qing WANG Li-hua ZHAN +5 位作者 Yong-qian XU Chun-hui LIU Xing ZHAO Ling-zhi XU You-liang YANG Yi-xian CAI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第10期2599-2612,共14页
Creep aging behavior of retrogression and re-aged(RRAed)7150 aluminum alloy(AA7150)was systematically investigated using the creep aging experiments,mechanical properties tests,electrical conductivity tests and transm... Creep aging behavior of retrogression and re-aged(RRAed)7150 aluminum alloy(AA7150)was systematically investigated using the creep aging experiments,mechanical properties tests,electrical conductivity tests and transmission electron microscope(TEM)observations.Creep aging results show that the steady-state creep mechanism of RRAed alloys is mainly dislocation climb(stress exponent≈5.8),which is insensitive to the grain interior and boundary precipitates.However,the total creep deformation increases over the re-aging time.In addition,the yield strength and tensile strength of the four RRAed samples are essentially the same after creep aging at 140℃ for 16 h,but the elongation decreases slightly with the re-aging time.What’s more,the retrogression and re-aging treatment are beneficial to increase the hardness and electrical conductivity of the creep-aged 7150 aluminum alloy.It can be concluded that the retrogression and re-aging treatment before creep aging forming process can improve the microstructure within grain and at grain boundary,forming efficiency and comprehensive performance of mechanical properties and electrical conductivity of 7150 aluminum alloy. 展开更多
关键词 creep aging forming creep behavior mechanical properties electrical conductivity aging precipitates Al−Zn−Mg−Cu alloy
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Effects of Aging Temperature on Microstructure and High Cycle Fatigue Performance of 7075 Aluminum Alloy 被引量:2
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作者 杨大炼 刘义伦 +3 位作者 LI Songbai MA Liyong LIU Chi YI Jiuhuo 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第3期677-684,共8页
The hardness, the tensile and the high-cycle fatigue(HCF) performances of 7075 aluminum alloy were investigated under temper T651, solution treated at 380 ℃ for 0.5 h and aged at different temperatures(150, 170, 1... The hardness, the tensile and the high-cycle fatigue(HCF) performances of 7075 aluminum alloy were investigated under temper T651, solution treated at 380 ℃ for 0.5 h and aged at different temperatures(150, 170, 190 ℃) for 10 hours. The optimal microstructures and the fatigue fracture surfaces were observed. The results show that the hardness and the tensile performances are at their optimum at T651, but the fatigue life is the shortest. The hardness and the elongation are the lowest after solution treatment. With the aging temperature increasing(150-190 ℃), the HCF is improved. The crack is initiated from the impurity particles on the subsurface. Treated at 170 ℃,the area of the quasi-cleavage plane and the width of parallel serrated sections of the crack propagation are the largest. With increasing aging temperature, the dimple size of finally fracture surfaces becomes larger and the depth deeper. 展开更多
关键词 creep aging forming(CAF) high cycle fatigue(HCF) microstructure 7075 aluminum alloy
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Non-isothermal creep age forming of Al-Cu-Li alloy:Experiment and modelling 被引量:1
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作者 Changhui WU Heng LI +2 位作者 Tianjun BIAN Chao LEI Liwen ZHANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2023年第5期566-581,共16页
Non-isothermal Creep Age Forming(CAF),including loading,heating,holding,cooling and springback stages,is an advanced forming technique for manufacturing high performance large integral panels at short production perio... Non-isothermal Creep Age Forming(CAF),including loading,heating,holding,cooling and springback stages,is an advanced forming technique for manufacturing high performance large integral panels at short production period and low cost.However,the creep deformation and aging precipitation during heating stage is often neglected in experiments and modeling,leading to low forming precision.To achieve shape forming and property tailoring simultaneously,a deep understanding of the non-isothermal creep aging behavior and the establishment of predictive models are urgently required.A new five-stage creep feature of Al-Cu-Li alloy during the non-isothermal creep aging is observed.The microstructural interactions between the dislocations,solute atoms,Guinier Preston zones(GP zones)and T1 precipitates are found to dominate the five-stage creep aging behavior.The physical-based model considering temperature evolution history is established to describe the five-stage creep feature.The springback and yield strength of non-isothermal creep age formed plates with different thicknesses are predicted and compared by non-isothermal CAF experiments and corresponding simulations.The CAF experiments show that the springback and yield strength of the non-isothermal creep age formed plate are 62.1%and 506 MPa,respectively.Simulation results are in good agreement with experimental results.The proposed model broadens the application of traditional CAF models that mainly focus on isothermal conditions. 展开更多
关键词 Al-Cu-Li alloy creep aging forming MICROSTRUCTURES SPRINGBACK Mechanical properties Thickness
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