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Microstructure Evolution and Mechanical Properties of Friction Stir Welded al-cu-li alloy

Acta Metallurgica Sinica(English Letters) 2024年第5期37卷 855-871页

作者： Peng Chen Wenhao Chen Jiaxin Chen Zhiyu Chen Yang Tang Ge liu Bensheng Huang Zhiqing Zhang School of New Energy and Materials Southwest Petroleum UniversityChengdu 610500China Sichuan Provincial Engineering Research Center of Advanced Materials Manufacturing Technology for Shale Gas High-Efficient Exploitation Southwest Petroleum UniversityChengdu 610500China College of Materials Science and Engineering Chongqing UniversityChongqing 400045China School of Mechatronic Engineering Southwest Petroleum UniversityChengdu 610500China School of Robot Engineering Yangtze Normal UniversityChongqing 408100China

The investigation concentrates on friction stir welded(FSW)al-cu-li alloy concerning its local microstructural evolution and mechanical *** grain features were characterized by electron back scattered diffraction(EBSD)technology,while precipitate characterization was conducted by using transmission electron microscopy(TEM)aligned along[011]al and[001]al zone *** mechanical properties are evaluated through micro-hardness and tensile *** can be found that nugget zones exhibit finely equiaxed grains evolved through complete dynamic recrystallization(DRX),primarily occurring in continuous dynamic recrystallization(CDRX)and discontinuous dynamic recrystallization(DDRX).In the thermal-mechanically affected zone(TMAZ),numerous sub-structured grains,exhibiting an elongated morphology,were created due to partial DRX,signifying the dominance of CDRX,DDRX,and geometric dynamic recrystallization(GDRX)in this region.T_(1)completely dissolves in the nugget zone(NZ)leading to the formation of Guinier-Preston zones and increase ofδ′,β′and S′.Conversely,T_(1)partially solubilizes in TMAZ,the lowest hardness zone(LHZ)and heat affected zone(HAZ),and the residual T_(1)undergoes marked coarsening,revealing various T_(1)*** solubilization and coarsening of T_(1)are primary contributors to the degradation of hardness and strength.θ′primarily dissolves and coarsens in NZ and TMAZ,whilst this precipitate largely coarsens in HAZ and LHZ.σ,TB,grain boundary phases(GBPs)and precipitate-free zone(PFZ)are newly generated during FSW.σexists in the TMAZ,LHZ and HAZ,whereas TB nucleates in *** and PFZ mostly develop in LHZ and HAZ,which can cause strain localization during tensile deformation,potentially leading to LHZ joint fracture.

关键词： al-cu-li alloy Friction stir welding Microstructure evolution Mechanical properties

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Dislocation reconfiguration during creep deformation of an al-cu-li alloy via electropulsing

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Journal of Materials Science & Technology 2022年第35期130卷 27-34页

作者： Chang Zhou lihua Zhan He li Chunhui liu Yongqian Xu Bolin Ma Youliang Yang Minghui Huang College of Mechanical and Electrical Engineering Central South UniversityChangsha410083China State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha410083China light alloys Research Institute Central South UniversityChangsha410083China

Creep mechanism was well-known to be mainly dominated by the dislocation sliding and climbing during creep deformation. Here we study the creep deformation of an al-cu-li alloy with the assistance of electropulsing and subsequent microstructural observations. We find that creep strain increased drastically under electropulsing and was almost twelve times as much as that of the non-pulsed sample. Microstructural observations confirmed that dislocation reconfiguration happens via electropulsing, namely helical dislocations being opened rapidly. This opened dislocation structure can possess a much higher mobility than the initial helical dislocation, which mostly responsible for the greatly increased creep strain. Our results revealed a new mechanism accountable for the distinctly electroplastic creep deformation.

关键词： Dislocation reconfiguration Electroplasticity al-cu-li alloy Creep deformation

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Non-isothermal creep age forming of al-cu-li alloy:Experiment and modelling

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Chinese Journal of Aeronautics 2023年第5期36卷 566-581页

作者： Changhui WU Heng li Tianjun BIAN Chao LEI liwen ZHANG State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment Northwestern Polytechnical UniversityXi’an 710072China School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China

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 ***,the creep deformation and aging precipitation during heating stage is often neglected in experiments and modeling,leading to low forming *** 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 *** microstructural interactions between the dislocations,solute atoms,Guinier Preston zones(GP zones)and T1 precipitates are found to dominate the five-stage creep aging *** physical-based model considering temperature evolution history is established to describe the five-stage creep *** 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 *** CAF experiments show that the springback and yield strength of the non-isothermal creep age formed plate are 62.1%and 506 MPa,*** results are in good agreement with experimental *** proposed model broadens the application of traditional CAF models that mainly focus on isothermal conditions.

关键词： al-cu-li alloy Creep aging forming Microstructures Springback Mechanical properties Thickness

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Microstructures and mechanical properties of a cast al-cu-li alloy during heat treatment procedure

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Rare Metals 2021年第7期40卷 1897-1906页

作者： Shu-Wei Duan Kenji Matsuda Tao Wang Yong Zou MOE Key Laboratory for liquid-Solid Structure Evolution and Materials Processing Institute of Materials JoiningShandong UniversityJinan 250061China Department of Materials Science and Technology Faculty of EngineeringUniversity of ToyamaToyama 930-8555Japan

al-cu-li alloy is a huge potential alloy for aerospace industry due to its low density and excellent comprehensive *** this study,the microstructures and mechanical properties of a novel cast al-cu-li alloy during the heat treatment were *** showed that most of the secondary phases along grain boundaries in as-cast state were dissolved into the al matrix after homogenization and solution treatment,while the cu-rich phases were slightly segregated once again on grain boundaries after aging.A relatively good combination of strength and ductility(average ultimate tensile strength of 430 MPa and elongation of 8.9%)was obtained after natural *** electron microscopy(TEM)results revealed that there was a complicated precipitate distribution in this cast alloy after natural *** with the similar alloys which introduced dislocations before aging,the density of T1(al_(2)culi)phases was decreased but the size was *** low volume fraction of d0 phase,medium density of needle-shaped precipitates and relativity narrow precipitates-free zone with varying widths near grain boundary are the reasons accounting for the improvement of performances.

关键词： al-cu-li alloy Heat treatment Microstructure Mechanical property Precipitate

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Processing maps and microstructural evolution of al-cu-li alloy during hot deformation

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Rare Metals 2019年第12期38卷 1136-1143页

作者： Sheng-li Yang Jian Shen Yong-An Zhang Zhi-Hui li Xi-Wu li Shu-Hui Huang Bai-Qing Xiong State Key Laboratory of Nonferrous Metals and Processes General Research Institute for Nonferrous Metals

The hot deformation behavior of al-cu-li alloy was investigated by hot compression tests in the temperature range of 340-500℃ with strain rate of 0.001-10.000 s^(-1).Based on the dynamic materials model(DMM),processing maps of the test alloy were developed for optimizing hot processing *** optimum parameters of hot deformation for al-cu-li alloy are at temperature of 400-430℃and strain rate of about 0.100 s^(-1),with efficiency of power dissipation of around 30%.The microstructural manifestation of the alloy deformed in instability domains is flow localization,and dynamic softening first occurs in flow localizations *** stable domains,dynamic recovery(DRV) and dynamic recrystallization(DRX) are the main microstructural evolution *** is gradually strengthened with the increase in deformation temperature and the decrease in strain *** hot deformation,the DRX mechanism of al-cu-li alloy is dominated by continuous DRX(CDRX).A DRX model of al-cu-li alloy is proposed based on the microstructural evolution process of the test alloy.

关键词： al-cu-li alloy Processing map Dynamic recovery and dynamic recrystallization Microstructural evolution

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Characterization of Hot Deformation Behavior of a Novel al–cu–li alloy Using Processing Maps

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Acta Metallurgica Sinica(English Letters) 2015年第7期28卷 817-825页

作者： Xin-Xiang Yu Yi-Ran Zhang Deng-Feng Yin Zhi-Ming Yu Shu-Fei li School of Materials Science and Engineering Central South University School of Engineering Yantai Nanshan University

The isothermally compression deformation behavior of an elevated cu/li weight ratio al–cu–li alloy was investigated under various deformation *** isothermal compression tests were carried out in a temperature range from 300 to 500℃ and at a strain rate range from 0.001 to 10 s^-*** results show that the peak stress level decreases with temperature increasing and strain rate decreasing,which is represented by the Zener–Hollomon parameter Z in the hyperbolic sine equation with the hot deformation activation energy of 218.5 k J/*** low Z value,the dynamic recrystallized grain is well formed with clean high-angle *** high Z value,a high dislocation density with poorly developed cellularity and considerable fine dynamic precipitates are *** on the experimental data and dynamic material model,the processing maps at strain of 0.3,0.5 and 0.7 were developed to demonstrate the hot workability of the *** results show that the main softening mechanism at high Z value is precipitate coarsening and dynamic recovery;the dynamic recrystallization of the alloy can be easily observed as ln Z ≤ 29.44,with peak efficiency of power dissipation of around 70%.At strains of 0.3,0.5 and 0.7,the flow instability domains are found at higher strain rates,which mainly locate at the upper part of processing *** addition,when the strain rate is 0.001 or 0.02 s^-1,there is a particular instability domain at 300–350℃.

关键词： al-cu-li alloy Hot deformation behavior Microstructure evolution Processing maps

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Effect of grain structure on fatigue crack propagation behavior of al-cu-li alloys

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Journal of Materials Science & Technology 2023年第17期148卷 75-89页

作者： Dingding Lu Ben lin Tianle liu Sanxi Deng Youjie Guo Jinfeng li Danyang liu School of Materials Science and Engineering Central South UniversityChangsha 410083China China Academy of Launch Vehicle Technology Beijing 100076China State Key Laboratory of Nonferrous Metals and Processes GRINM Group Co.LTD.Beijing 100088China Key Laboratory of Nonferrous Metal Materials Science and Engineering Ministry of EducationChangsha 410083China

Recrystallization behavior during optimized heat treatments provides a potential to obtain desirable grain structure,which significantly improves the mechanical properties of aluminum *** influence of grain structures on fatigue crack propagation(FCP)behaviors of al-cu-li alloy with hot-rolled(HR)and cold-rolled(CR)was *** boundaries have a significant impact on small crack growth rates,which is reflected in the pronounced fluctuation of fatigue crack growth of HR specimens after solution ***,the specific cellular structure within grains can improve the deformation capacity of alloys due to their accommodation of plastic deformation,which contributes to the lower fatigue crack growth rates and higher threshold values in HR *** intragranular deflection also decelerates the FCP rate and occurs in these regions of large grain without subgrain *** occurs in the CR specimens,resulting in small anisotropy on the fatigue resistance for the different orientations in the Paris stage due to the recrystallization *** cracks can be deflected and tend to propagate along the grain boundaries when it goes into the grain with a relatively low Schmidt factor value.

关键词： al-cu-li alloy Fatigue crack propagation Grain structure Microcrack

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Sc和Si微合金化提高al-cu-li合金的耐热性

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Science China Materials 2023年第11期66卷 4285-4294页

作者：薛昊李佳铭王志琪白俊源赵志浩秦高梧 Key Laboratory for Anisotropy and Texture of Materials(MoE) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Research Center for Metallic Wires Northeastern UniversityShenyang 110819China

第三代铝锂合金(al-cu-li合金)在航空航天领域应用广泛,但服役温度一般低于100℃.本研究中,我们提出了一种提高al-cu-li合金在200-300℃下耐热性的新思路,即通过添加微量的Sc和Si元素,当T1相在热暴露过程中溶解后,促进θ′相的形核析出.... 详细信息

第三代铝锂合金(al-cu-li合金)在航空航天领域应用广泛,但服役温度一般低于100℃.本研究中,我们提出了一种提高al-cu-li合金在200-300℃下耐热性的新思路,即通过添加微量的Sc和Si元素,当T1相在热暴露过程中溶解后,促进θ′相的形核析出.在200-300℃的热暴露过程中,Sc和Si微合金化的al-cu-li合金中有大量的纳米θ′相析出,并具有高的热稳定性,相反,无微合金化的al-cu-li合金中的θ′相则迅速粗化.Sc和Si微合金化的al-cu-li合金在300℃下的抗拉强度为155 MPa,延伸率为9.2%.因此,Sc和Si微合金化的al-cu-li合金在200-300℃下的耐热性显著提高,与商用耐热铝合金2618和2219相比,具有更优异的高温强度和比强度.

关键词： al-cu-li alloy heat resistance microstructure evo-lution mechanical property

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