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Unveiling the growth and morphological transition mechanisms of Al2Cu intermetallic compounds quantified by synchrotron X-ray tomography

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材料科学技术（英文版） 2025年第6期209卷 43-54页

作者： Zongye Ding Liao Yu Naifang Zhang Wenquan Lu Jianguo Li Qiaodan Hu Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Mechatronic Engineering and Automation Foshan UniversityGuangdong 528225China Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Controlling the morphology of Al2Cu intermetallic compounds(IMCs)has been of importance to enhance the properties of Al-based ***,the quantification of Al2Cu IMCs with diversified morphologies is still lacking,and the morphological evolution of Al2Cu dendrites remains poorly *** synchrotron X-ray tomography,we have directly quantified the morphological evolution of proeutectic Al2Cu IMCs in directionally solidified Al-Cu *** three-dimensional(3D)morphologies of Al2Cu IMCs under different growth rates were quantified using volume,specific surface area,interconnectivity,tortuosity,and Gaussian *** faceted morphology under slow growth rate was divided into three different types,including single hollow prism,irregular prism lacking partial faces,and coalesced prism consisting of two adjacent *** morphological transition from faceted prism to non-faceted algae-like,irregular tree-like,and typically dendritic shapes with increasing growth rates was determined,reflecting the growth modes varied from lateral mode to intermediary and continuous *** non-faceted Al2Cu dendrite had one primary stem,three groups of secondary arms,and a faceted *** angles between secondary arms were 120°,and the tip consisted of(011)and(01(1))*** work provides a deep understanding of the formation and growth of complex IMCs in metallic alloys.

关键词： Proeutectic Al2Cu intermetallic Synchrotron tomography Directional solidification 3-D morphology

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Bulging Distortion of Austenitic Stainless Steel Sheet on the Partially Penetrated Side of Non-Penetration Lap laser Welding Joint

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Chinese Journal of Mechanical Engineering 2024年第1期37卷 286-295页

作者： Chengwu Yao Enze Liu Jiaming Ni Binying Nie Shanghai Key Laboratory of Materials Laser Processing and Modification School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Aerospace Precision Machinery Institute Shanghai 201600China Chemical and Biological Engineering College Yichun UniversityYichun 336000China

Non-penetration laser welding of lap joints in austenitic stainless steel sheets is commonly preferred in fields where the surface quality is of utmost ***,the application of non-penetration welded austenitic stainless steel parts is limited owing to the micro bulging distortion that occurs on the back surface of the partial penetration *** this paper,non-penetration lap laser welding experiments,were conducted on galvanized and SUS304 austenitic stainless steel plates using a fiber laser,to investigate the mechanism of bulging distortion.A comparative experiment of DC01 galvanized steel-Q235 carbon steel lap laser welding was carried out,and the deflection and distortion profile of partially penetrated side of the sheets were measured using a noncontact laser *** addition,the cold-rolled SUS304 was subjected to heat holding at different temperatures and water quenching after bending to characterize its microstructure under tensile and compressive *** results show that,during the heating stage of the thermal cycle of laser lap welding,the partial penetration side of the SUS304 steel sheet generates compressive stress,which extrudes the material in the heat-affected zone to the outside of the back of the SUS304 steel sheet,thereby forming a *** findings of these experiments can be of great value for controlling the distortion of the partial penetrated side of austenitic stainless steel sheet during laser non-penetration lap welding.

关键词： Non-penetration lap laser welding Bulging distortion Austenitic stainless steel Compressive stress Tension stress

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Machine learning for prediction of retained austenite fraction and optimization of processing in quenched and partitioned steels

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Journal of Iron and Steel Research International 2024年第8期31卷 2002-2013页

作者： Shuai Wang Jie Li Li-yang Zeng Xun-wei Zuo Nai-lu Chen Yong-hua Rong Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

The metastable retained austenite(RA)plays a significant role in the excellent mechanical performance of quenching and partitioning(Q&P)steels,while the volume fraction of RA(V_(RA))is challengeable to directly predict due to the complicated relationships between the chemical composition and process(like quenching temperature(Qr)).A Gaussian process regression model in machine learning was developed to predict V_(RA),and the model accuracy was further improved by introducing a metallurgical parameter of martensite fraction(fo)to accurately predict V_(RA) in Q&P *** developed machine learning model combined with Bayesian global optimization can serve as another selection strategy for the quenching temperature,and this strategy is very effcient as it found the"optimum"Qr with the maximum V_(RA) using only seven consecutive *** benchmark experiment also reveals that the developed machine learning model predicts V_(RA) more accurately than the popular constrained carbon equilibrium thermodynamic model,even better than a thermo-kinetic quenching-partitioning-tempering-local equilibrium model.

关键词： Q&P steel Retained austenite fraction Machine learning Quenching temperature Gaussian process regression model

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Mechanisms of plastic deformation and mechanical strengthening in nano-scale Ti-Ti_(2)Cu eutectoids:A study combined molecular dynamics simulation and experiment

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Journal of materials Science & Technology 2024年第26期193卷 146-159页

作者： Haodong Wang Chun Yu Moqiu Li Yi Zheng Junmei Chen Jieshi Chen Hao Lu Jijin Xu Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Materials Science and Engineering Shanghai University of Engineering ScienceShanghai 201602China

Ti-Cu eutectoid or near-eutectoid alloys were found to possess exceptional high strength owning to the nano-scale lamellar structure of Ti_(2)Cu andα-Ti after additive manufacturing,they are potential candidates for high-performance *** reveal the deformation and strengthening mechanisms,the molecular dynamics(MD)simulations and experimental analysis were carried out upon Ti-Ti_(2)Cu *** this work,we focused on revealing the interface dislocations(IDs)pattern and its effects on the dynamic evolution of the lattice dislocations(LDs)at the Ti/Ti_(2)Cu interface with(0001)α//(013)Ti_(2)Cu orientation *** simulations depicted that the equilibrium Ti/Ti_(2)Cu interface contains three groups of partial dislocations which dictate two interfacial coherent structures with low stacking fault *** ID consists of several segments,connected by atomic steps with identical *** nucleation sites of LDs under external loading locate at the intersection between the dislocation segment and the atomic step,which is related to the local high atom *** compression deformation,the100{011}and331{103}slip systems in Ti_(2)Cu,and the112¯3{101¯1}slip system inα-Ti are activated,achieving a co-deformation mechanism in the Ti-Ti_(2)Cu *** dislocation-interface interactions are responsible for the deformation plasticity and in turn governs the mechanical *** nanoindentation tests,larger hardness(∼6.2 GPa)and smaller activation volume(∼12b3)were found in the Ti-Ti_(2)Cu lamellae,which is mainly ascribed to the presence of high-density lamellae interface and confined layer slip,resulting in interface-mediated dislocation annihilation/deposition and consequent high strain *** MD simulations,nanoindentation tests and TEM investigations of interlayer dislocation activity support the strengthening mechanism of dislocation-interface interactions.

关键词： Ti-Ti_(2)Cu eutectoids Interface Dislocation Molecular dynamics

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Revealing dislocation activity modes during yielding and uniform deformation of low-temperature tempered steel by acoustic emission

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Journal of Iron and Steel Research International 2024年第12期31卷 3022-3036页

作者： Jie Li Jia-zhi Zhang Li-yang Zeng Shuai Wang Xiang-yu Song Nai-lu Chen Xun-wei Zuo Yong-hua Rong Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of ScienceShanghai201800China

The distinctive distribution of acoustic emission(AE)characteristic parameters generated during tensile testing of low-temperature tempered AISI 4140 steel was *** clusters of acoustic emission signals were distinguished using power-law distribution fitting and k-means clustering *** clusters were identified as resulting from dislocation motion during yielding and dislocation entanglement during uniform plastic *** conclusion is further confirmed by transmission electron microscopy images at different *** particular,the unique"arch-shaped"distribution of the acoustic emission energy during yielding implies a change in unusual dislocation motion *** effect of carbide precipitation was qualitatively discussed as not considering the primary cause of the formation of this arch-shaped *** evolution of dislocation motion modes during yielding of low-temperature tempered martensite was elucidated by comparing the significant difference in cumulative energy values during yielding of annealed and low-temperature tempered *** emit from Frank–Read or grain boundary sources and slip along short free paths,contributing to the initial increase in AE signals ***,the primary source of acoustic emission energy“arch-shaped”peak during yielding was generated by the avalanche behavior of accumulated dislocations,leading to the accelerated dislocation motion.

关键词： Dislocation activity mode Acoustic emission k-means clustering method Power-law distribution AISI4140 tempered steel

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Inhibition of Abnormal Grain Growth in Stir Zone via In‑Situ Intermetallic Particle Formation During Friction Stir Welding of AA6061

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Acta Metallurgica Sinica(English Letters) 2023年第4期36卷 597-610页

作者： Xin Zou Cunli Liu Muyang Deng Ji Chen Lanting Zhang Ke Chen School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Shanghai Key Laboratory of Material Laser Processing and Modification Shanghai Jiao Tong UniversityShanghai 200240China Shanghai-FANUC Robotics CO. LTDShanghai 201906China

Abnormal grain growth(AGG)has been widely observed in many friction stir welded(FSWed)joints during post-weld heat treatment(PWHT).The coarse grain structure not only reduces the strength of the joint but also limits its usage in superplastic *** methods have been reported in previous studies to inhibit AGG,but all of them can only mitigate *** inhibition of AGG was not *** the current research,AGG was widely observed during the PWHT of friction stir welded ***-pass FSW enhanced the thermal stability of the as-welded grain structure but did not eliminate the occurrence of AGG.A new welding method was developed with the ball-milled Al–Ti powder mixture introduced into the stir zone and proved effective in inhibiting AGG in FSWed AA6061 during *** adoption of 5-pass FSW with an alternate rotation mode succeeded in producing an AGG-free *** characterizations conducted in the stir zone showed an evolution of Al–Ti powder mixture into different particle formations and Al3Ti new *** analysis of the second phase particles(SPPs)in the stir zone confirmed the increases in both particle number and average *** quantitative results fit well with Humphreys’grain growth model,which theoretically explains the mechanism for AGG inhibition,i.e.,the significantly enhanced particle pinning effect.

关键词： Abnormal grain growth Friction stir welding AA6061 Second phase particle Particle pinning

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Highly active and durable La_(0.6) Ca_(0.4)(CrMnFeCo_(2)Ni)O_(3) high entropy perovskite oxide as electrocatalyst for oxygen evolution reaction in alkaline media

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Journal of materials Science & Technology 2024年第1期168卷 71-78页

作者： Xiaoqiang Ji Fan Yang Yunzhu Du Jing Li Jianguo Li Qiaodan Hu Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Oxygen evolution reaction(OER)is the imperative reaction for many energy storage and conversion devices such as recharge-able metal-air batteries and electrochemical water splitting[1].OER is a complex 4-electron process with sluggish kinetics and therefore requires electrocatalysts to overcome the high *** oxide(RuO_(2))and iridium oxide(IrO_(2))catalysts can promote the OER process remarkably[2-4],however,their ex-tremely high cost,natural scarcity,and long-term instability con-strain their scale-up application in clean-energy technologies[5,6].It is crucial to develop inexpensive,highly efficient,and durable electrocatalysts for OER.

关键词： entropy alkaline perovskite

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An optimization of harmonic structure nickel-saving cryogenic steel via combinatorial high-throughput experiment

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Journal of Iron and Steel Research International 2023年第5期30卷 1042-1049页

作者： Xing-qi Jia Feng-hua Lu Kai Yang Shi-long Liu Chun Yu Wei Li Xue-jun Jin Shanghai Key Laboratory of Materials Laser Processing and Modification Shanghai Jiao Tong UniversityShanghai 200240China College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211106JiangsuChina

A combinatorial high-throughput experiment(HTE)was used to optimize composition and process of nickel-saving cryogenic steel.A gradient temperature heat treatment method with a high linear distribution of heat treatment temperature using customized graphite sleeve direct current heating was used in the combinatorial HTE,which enhanced the richness of the sample library for the single preparation of the 10^(2) level component process *** steel with excellent mechanical properties was optimized using this combinatorial HTE,and the Ni content was reduced from the traditional 9 to 5.6 wt.%by using Mn instead of *** heterogeneous structure architecture strategy and strengthening and toughening mechanism of the harmonic structure induced by intrinsic heat treatment of additive manufacturing were *** the composition process optimization of Ni-saving cryogenic steel as an example,the boosting ability of combinatorial HTE in the research and development of new metal materials was proposed.

关键词： High-throughput experiment laser metal deposition Gradient heat treatment Cryogenic steel Heterogeneous structure

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Effect of Carbon Migration on Interface Fatigue Crack Growth Behavior in 9Cr/CrMoV Dissimilar Welded Joint

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Acta Metallurgica Sinica(English Letters) 2022年第5期35卷 714-726页

作者： Qi Wang Chendong Shao Haichao Cui Yuan Gao Fenggui Lu Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China

Fatigue crack growth(FCG)behavior of 9 Cr/CrMoV dissimilar welded joint at elevated temperature and different stress ratios was *** was paid to the region near the fusion line of 9 Cr where carbon-enriched zone(CEZ)and carbon-depleted zone(CDZ)formed due to carbon migration during the welding *** and brittle tempered martensite dominated the stress ratio-insensitive FCG behavior in the coarse grain zone(CGZ)of 9 *** crack near the CGZ-CEZ interface,crack deflection through the CEZ and into the CDZ was observed,accompanied by an accelerating FCG *** with the severe plastic deformation near the secondary crack in 9 Cr-CGZ,the electron back-scattered diffraction analysis showed less deformation and lower resistance in the direction toward the brittle CEZ,which resulted in the transverse *** spite of the plastic feature in CDZ revealed by fracture morphology,the less carbides due to carbon migration led to lower strength and weaker FCG resistance property in this *** conclusion,the plasticity deterioration in CEZ and strength loss in CDZ accounted for the FCG path deflection and FCG rate acceleration,respectively,which aggravated the worst FCG resistance property of 9 Cr-HAZ in the dissimilar welded joint.

关键词： Fatigue crack growth Dissimilar welded joint Carbon migration Crack transverse deflection Carbonenriched zone

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Preface to the Special Issue:Application of Synchrotron Radiation in materials Research

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Acta Metallurgica Sinica(English Letters) 2022年第1期35卷 1-2页

作者： Qiaodan Hu Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Synchrotron radiation was observed for the first time by Haber et *** General Electric in the United States in 1947 in a 70-MeV electron *** development of synchrotron radiation light source has gone through four gene... 详细信息

关键词： Issue synchrotron

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