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Thermomechanical response of aluminum alloys under the combined action of tensile loading and laser irradiations

Chinese Physics B 2018年第3期27卷 469-480页

作者： Mohsan Jelani Zewen Li Zhonghua Shen Maryam Sardar School of Science Nanjing University of Science and Technology Nanjing 210094 China Advanced Launching Co-Innovation Centre Nanjing University of Science and Technology Nanjing 210094 China

This study reports the investigation of the thermomechanical behavior of aluminum alloys （AI-1060, A1-6061, and A1-7075） under the combined action of tensile loading and laser irradiations. The continuous wave ytterbium fiber laser （wavelength 1080 nm） was employed as the irradiation source, while tensile loading was provided by the tensile testing machine. The effects of various pre-loading and laser power densities on the failure time, temperature distribution, and the deformation behavior of aluminum alloys are analyzed. The experimental results represent the significant reduction in failure time for higher laser power densities and for high preloading values, which implies that preloading may contribute a significant role in the failure of the material at elevated temperature. Fracture on a microscopic scale was predominantly ductile comprising micro-void nucleation, growth, and coalescence. The AI-1060 specimens behaved plastically to some extent, while A1-6061 and A1-7075 specimens experienced catastrophic failure. The reason and characterization of ma- terial failure by tensile and laser loading are explored in detail. A comparative behavior of under-tested materials is also investigated. This work suggests that studies considering only combined loading are not enough to fully understand the mechanical behavior of under-tested materials. For complete characterization, one should consider the effect of heating as well as loading rate and the corresponding involved processes with the help of thermomechanical coupling and the thermal elastic-plastic theory.

关键词： aluminum alloys fiber laser tensile loading thermomechanical effects failure evolution

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The latest development of Sc-strengthened aluminum alloys by laser powder bed fusion

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Journal of Materials Science & Technology 2023年第18期149卷 1-17页

作者： Dina Bayoumy Wenhao Kan Xinhua Wu Yuman Zhu Aijun Huang Monash Centre for Additive Manufacturing 15-17 Normanby RoadNotting HillVIC 3168Australia Department of Materials Science and Engineering Monash UniversityClaytonVIC 3800Australia

Laser powder bed fusion(LPBF)is one of the typical additive manufacturing techniques that enables the fabrication of complex-shaped structures with great freedom of *** to the challenges encoun-tered in LPBF processing of Al alloys,most studies have focused on AlSi alloys which are much easier to process but are not inherently designed for high-strength *** recent years,however,signif-icant progress has been made to develop Sc-containing Al alloys that are designed specifically for LPBF *** alloys display excellent processability and superior mechanical properties that open up a range of possible applications in industries that require high specific strength,good thermal stability,and increased *** such,this paper reviews the available literature on how Sc additions in-fluence the microstructure and properties of Al alloys when processed via LPBF and thus,aims to shed light on the considerations that have been made to achieve remarkable material consolidation alongside excellent mechanical properties,with the latter achieved through a high degree of Sc supersaturation and a great potential for nanoprecipitation.

关键词： aluminum alloys Scandium Additive manufacturing Laser powder bed fusion Mechanical property Microstructure

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Parametric optimization of friction stir welding process of age hardenable aluminum alloys-ANFIS modeling

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Journal of Central South University 2016年第8期23卷 1847-1857页

作者： D.Vijayan V.Seshagiri Rao Department of Mechanical Engineering Sri Chandrasekharendra Saraswathi Viswa Maha Vidyalaya Enathur Kanchipuram- 631561 Tamilnadu India St. Joseph's College of Engineering Chennai - 600025 Tamilnadu India

A comparative approach was performed between the response surface method(RSM) and the adaptive neuro-fuzzy inference system(ANFIS) to enhance the tensile properties, including the ultimate tensile strength and the tensile elongation, of friction stir welded age hardenable AA6061 and AA2024 aluminum alloys. The effects of the welding parameters, namely the tool rotational speed, welding speed, axial load and pin profile, on the ultimate tensile strength and the tensile elongation were analyzed using a three-level, four-factor Box-Behnken experimental design. The developed design was utilized to train the ANFIS models. The predictive capabilities of RSM and ANFIS were compared based on the root mean square error, the mean absolute error, and the correlation coefficient based on the obtained data set. The results demonstrate that the developed ANFIS models are more effective than the RSM model.

关键词： aluminum alloys response surface method(RSM) adaptive neuro-fuzzy inference system(ANFIS) friction stir welding Box-Behnken design neuro fuzzy

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New Inclusion Assessment Method in aluminum alloys——Electrochemical Method for Inclusion Assessment

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Chinese Journal of Mechanical Engineering 2011年第1期24卷 160-166页

作者： XU Zhengbing ZOU Yongzhi ZENG Jianmin State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi ＇an 710072 China

The existence of inclusion influences the properties of aluminum alloy castings,from which the castings will face scrapping under severe *** efforts on the inclusions in aluminum alloy were made and many inclusion assessment methods were put ***,most of the current methods are characterized by time consuming and expensive equipment cost,which limits the application in aluminum *** the aluminum properties are sensitive to the inclusion,this paper tries to establish a new kind of inclusion assessment *** inclusions were introduced to aluminum melts by adding aluminum *** samples with different inclusion contents were *** microstructure contained inclusions was *** inclusion was automatically identified with an image analyzer by setting different grey threshold value,and the inclusion content was *** image analysis shows that inclusions wreck the continuity of the alloy matrix seriously,and the inclusion area percentage increases with the increasing of aluminum *** high and low polarization measurements were conducted in 3.5 wt% NaCl aqueous solution at the temperature of 25 ℃.The electrochemical parameters of the testing materials,such as corrosion potential E k,corrosion current density I k and the linear polarization resistance R p,were *** polarization measurement results show that the linear polarization resistances decrease,the corrosion potentials move towards more negative direction,and the corrosion current densities increase with the increasing of inclusion *** theoretical analysis of the inclusion content and the corrosion current density was *** existence of inclusions makes the microstructure form corrosion microcells between the alloy matrix and *** impressed current can accelerate the current velocity or corrosion current *** regression model of the inclusion contents *** corrosion current density was *** model can

关键词： aluminum alloys inclusion assessment electrochemical parameters electrochemical method for inclusion assessment (EcMIA)

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Precipitating thermally reinforcement phase in aluminum alloys for enhanced strength at 400℃

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Journal of Materials Science & Technology 2024年第5期172卷 71-82页

作者： Xiang Su Yuan Lei Yang Chen Hongjie Qu Zhixiang Qi Gong Zheng Xu Liu Henggao Xiang Guang Chen National Key Laboratory of Advanced Casting Technologies MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials TechnologyEngineering Research Center of Materials Behavior and DesignMinistry of EducationNanjing University of Science and TechnologyNanjing 210094China School of Aviation and Mechanical Engineering Changzhou Institute of TechnologyChangzhou 213032China

Heat-resistant aluminum alloys are widely used in aerospace and automotive fields for manufacturing hot components due to their advantages in lightweight design and energy ***,the high-temperature strength of existing cast aluminum alloys is always limited to about 100 MPa at 350℃due to coarsening and transformation of strengthening ***,we reveal that the yield strength and ultimate tensile strength of the T6 state Al-8.4Cu-2.3Ce-1.0Mn-0.5Ni-0.2Zr alloy at 400◦C increase by 34%and 44%after re-aging at 300℃for 100 h,and its thermal strength exhibits distinguished ad-vantage over traditional heat-resistant aluminum *** enhanced elevated-temperature strength is attributed to the reprecipitation of the Ni-bearing T-Al_(20)Cu_(2)Mn_(3)phase,whose number density increases over one *** significant segregation of Ni,Ce,and Zr elements at the interfaces helps improve the thermal stability of the T *** thermostable T phase effectively strengthens the matrix by in-hibiting dislocation ***,a highly interconnected 3D intermetallic network along the grain boundaries can still remain after long-term re-aging at 300℃,which is conducive to imposing a drag on the grain boundaries at high *** finding offers a viable route for enhancing the elevated-temperature strength of heat-resistant aluminum alloys,which could provide expanded opportunities for higher-temperature applications.

关键词： aluminum alloys Precipitation Thermally reinforcement phase Re-aging treatment High-temperature strength

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Evolution of insoluble eutectic Si particles in anodic oxidation films during adipic–sulfuric acid anodizing processes of ZL114A aluminum alloys

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International Journal of Minerals,Metallurgy and Materials 2015年第3期22卷 302-308页

作者： Lei Hua Jian-hua Liu Song-mei Li Mei Yu Lei Wang Yong-xin Cui School of Materials Science and Engineering Beihang University Beijing Xinghang Mechanical-electrical Equipment CO. LTD.

The effects of insoluble eutectic Si particles on the growth of anodic oxide films on ZL114A aluminum alloy substrates were in- vestigated by optical microscopy （OM） and scanning electron microscopy （SEM）. The anodic oxidation was performed at 25℃ and a con- stant voltage of 15 V in a solution containing 50 g/L sulfuric acid and 10 g/L adipic acid. The thickness of the formed anodic oxidation film was approximately 7.13 μm. The interpore distance and the diameters of the major pores in the porous layer of the film were within the ap- proximate ranges of 10~20 nm and 5-10 nm, respectively. Insoluble eutectic Si particles strongly influenced the morphology of the anodic oxidation films. The anodic oxidation films exhibited minimal defects and a uniform thickness on the ZL114A substrates; in contrast, when the front of the oxide oxidation films encountered eutectic Si particles, defects such as pits and non-uniform thickness were observed, and pits were observed in the films.

关键词： aluminum alloys anodizing anodic oxidation thin films eutectic silicon particles

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Fluidity of ADC12+xLa aluminum alloys

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Rare Metals 2021年第5期40卷 1191-1197页

作者： Zheng-Hua Li Hong Yan Zhi Hu Xian-Chen Song Department of Materials Processing Engineering School of Mechanical and Electrical EngineeringNanchang UniversityNanchang 330031China Key Laboratory of Light Alloy Preparation&Processing in Nanchang Nanchang 330031China

The influence of rare earth lanthanum and pouring temperature on the fluidity of ADC 12 aluminum alloy was studied through spiral fluidity specimens by means of optical microscopy(OM) and differential thermal analyzer(DTA).The least squares regression method was used to give the best fitting between the function and the experimental *** experimental results indicate that the rare earth lanthanum can significantly increase the fluidity of ADC 12 *** fluidity increases with the addition of *** DTA results indicate that with the addition of lanthanum,the range of crystallization temperature decreases,which increases the fluidity ***,the range of crystallization temperature decreases by 32.66 % and the fluidity length is 1,321 mm(increased by 38.91%) when the addition of lanthanum is 0.6 wt%.Furthermore,with the increase of pouring temperatures,the fluidity length increases linearly between 670 and 760℃.

关键词： Fluidity aluminum alloys Rare earth Pouring temperature

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Semi-solid near-net shape rheocasting of heat treatable wrought aluminum alloys

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Transactions of Nonferrous Metals Society of China 2010年第9期20卷 1719-1724页

作者： U.A.C URLE Materials Science and Manufacturing Council for Scientific and Industrial Research

Flexibility of the CSIR-RCS, induction stirring with simultaneous air cooling process, in combination with high pressure die casting is successfully demonstrated by semi-solid rheocasting of plates performed on commercial 2024, 6082 and 7075 wrought aluminum alloys. Tensile properties were measured for the above mentioned rheocast wrought aluminum alloys in the T6 condition. The results showed that tensile properties were close to or even in some cases exceeded the minimum specifications. The yield strength and elongation of rheocast 2024-T6 exceeded the minimum requirements of the wrought alloy in the T6 condition but the ultimate tensile strength achieved only 90% of the specification because the Mg content of the starting alloy was below the commercial alloy specification. The strengths of rheocast 6082-T6 exceeded all of the wrought alloy T6 strength targets but the elongation only managed 36% of the required minimum due to porosity, caused by incipient melting during solution heat treatment, and the presence of fine intermetallie needles in the eutectic. The yield strength of rheocast 7075 exceeded the required one and the ultimate tensile strength also managed 97% of the specification; while the elongation only reached 46% of the minimum requirement also due to incipient melting porosity caused during the solution heat treatment process.

关键词： high pressure die casting (HPDC) aluminum alloys as-cast condition T6 treatment incipient melting

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Review on laser directed energy deposited aluminum alloys

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International Journal of Extreme Manufacturing 2024年第2期6卷 84-131页

作者： Tian-Shu Liu Peng Chen Feng Qiu Hong-Yu Yang Nicholas Tan Yew Jin Youxiang Chew Di Wang Ruidi Li Qi-Chuan Jiang Chaolin Tan Singapore Institute of Manufacturing Technology(SIMTech) Agency for ScienceTechnology and Research(A∗STAR)5 Cleantech LoopSingapore 636732Singapore State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130025People’s Republic of China Key Laboratory of Automobile Materials Ministry of Education and Department of Materials Science and EngineeringJilin UniversityChangchun 130025People’s Republic of China School of Mechanical&Automotive Engineering South China University of TechnologyGuangzhou 510640People’s Republic of China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083People’s Republic of China

Lightweight aluminum(Al)alloys have been widely used in frontier fields like aerospace and automotive industries,which attracts great interest in additive manufacturing(AM)to process high-value Al *** a mainstream AM technique,laser-directed energy deposition(LDED)shows good scalability to meet the requirements for large-format component manufacturing and ***,LDED Al alloys are highly challenging due to their inherent poor printability(*** laser absorption,high oxidation sensitivity and cracking tendency).To further promote the development of LDED high-performance Al alloys,this review offers a deep understanding of the challenges and strategies to improve printability in LDED Al *** porosity,cracking,distortion,inclusions,element evaporation and resultant inferior mechanical properties(worse than laser powder bed fusion)are the key challenges in LDED Al *** parameter optimizations,in-situ alloy design,reinforcing particle addition and field assistance are the efficient approaches to improving the printability and performance of LDED Al *** underlying correlations between processes,alloy innovation,characteristic microstructures,and achievable performances in LDED Al alloys are *** benchmark mechanical properties and primary strengthening mechanism of LDED Al alloys are *** review aims to provide a critical and in-depth evaluation of current progress in LDED Al *** opportunities and perspectives in LDED high-performance Al alloys are also outlined.

关键词： additive manufacturing laser directed energy deposition(LDED) aluminum alloys printability aluminum matrix composite auxiliary fields mechanical properties

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A Model for Evaluation of Grain Sizes of aluminum alloys with Grain Refinement Additions

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Journal of Materials Science & Technology 2007年第5期23卷 619-622页

作者： Zhongwei CHEN Zhi HE Wanqi JIE State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi＇an 710072 China

Based on the assumption that the nucleation substrates are activated by constitutional undercooling generated by an adjacent grain growth and solute distribution during the initial solidification, a model for calculation of the grain size of aluminum alloys with the grain refinement is developed, where the nucleation is dominated by two parameters, i.e. growth restriction factor Q and the undercooling parameter P. The growth restriction factor Q is proportional to the initial rate of constitutional undercooling development and can be used directly as a criterion of the grain refinement in the alloys with strong potential nucleation particles. The undercooling parameter P can be regarded as the maximum of constitutional undercooling △Tc. For weak potential nucleation particles, the use of RGS would be more accurate. The experimental data of the grain refinement of pure aluminum and AlSi7 alloys are coincident predicted results with the model.

关键词： Grain refinement Constitutional undercooling Nucleation aluminum alloys

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