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Deciphering the glass-forming ability of Al_(2)O_(3)-Y_(2)O_(3)system from temperature susceptibility of melt structure

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Journal of materials Science & Technology 2024年第18期185卷 48-57页

作者： Pingsheng Lai Xuan Ge Caijuan Shi Jianqiang Li Fan Yang 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 Department of Chemistry and Bioscience Aalborg UniversityAalborg 9220Denmark Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Despite its significance in both fundamental science and industrial applications,the glass-forming transition in the Al_(2)O_(3)-Y_(2)O_(3)(AY)refractory system is not yet fully understood due to the elusive structure evolution upon ***,atomic-scale structural changes in AY-bearing melts with different compositions and temperatures are tracked by employing in situ high-energy synchrotron X-ray diffraction and empirical potential structure refinement *** find that the glass-forming abilities(GFA)of AY-bearing melts are intriguingly correlated with the dependence of melt structure on *** the case of the Al_(2)O_(3)and Y_(3)A_(l5)O_(12)(YAG),the observed large structural changes from superheating to under-cooling melt(i.e.,higher temperature susceptibility)correspond to a low ***,the 74Al_(2)O_(3)-26Y_(2)O_(3)(AY26)melt,with the smallest temperature susceptibility,exhibits the highest *** models illustrate that the temperature susceptibility of melt is associated with its atomic arrangement,especially the stability of cation-cation pairs.A balanced network(in AY26 melt),where the unsteady OAl3 tri-clusters are minimized and steady apex-to-apex connections between adjacent network units are abundant,contributes to stabilizing cationic ***,in turn,fosters the formation of largesized Al-O-Al rings,which topologically facilitates the subsequent glass-forming *** findings provide new structural insight into the GFA of AY-bearing melts and may expand to other unconventional glass-forming systems to accelerate glassy materials design.

关键词： Glass-forming ability Al_(2)O_(3)-Y_(2)O_(3)glasses Melt structure High-energy synchrotron X-ray diffraction Aerodynamic levitation EPSR simulation

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Diverse nanomaterials synthesized by laser ablation of pure metals in liquids

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Science China(Physics,Mechanics & Astronomy) 2022年第7期65卷 48-82页

作者： DongShi Zhang ZhuGuo Li ChangHao Liang Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology Institute of Solid State PhysicsChinese Academy of SciencesHefei 230031China Department of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China

Diverse nanomaterials, in the forms of carbides, sulfides, oxides, metals, hydroxides, etc., have been synthesized by laser ablation in liquids(LAL) with metal targets as the dominant educts. Many advantages of LAL technique itself and its products have been revealed since 1983 when the first report about LAL was released. Different from traditional wet-chemical synthesis,one unique feature of LAL is its resultant extreme high-temperature and high-pressure local environment for the nucleation and growth of nanomaterials, despite being performed at room temperature. This extreme condition can induce the atomization and ionization of the target materials and liquid molecules to incur different chemical reactions. The laser, liquid, liquid additive, and target can significantly alter the local environment in a broad range. Thus, different phases and shapes of nanomaterials are producible even from the same target. Through directly comparing the products of LAL of 13 kinds of chosen representative metals synthesized under different conditions, this review presents and discusses current understandings, challenging issues, and perspectives related to the diversity of LAL-products, which is willing to promote a deeper investigation and discussion on a clear clarification of the chemical reactions and particle nucleation/growth processes.

关键词： nanomaterial synthesis laser ablation in liquid phase manipulation morphology diversity

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Application of novel constrained friction processing method to produce fine grained biomedical Mg-Zn-Ca alloy

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Journal of Magnesium and Alloys 2024年第2期12卷 516-529页

作者： Ting Chen Banglong Fu Junjun Shen Uceu F.H.R.Suhuddin Björn Wiese Yuanding Huang Min Wang Jorge F.dos Santos Jean Pierre Bergmann Benjamin Klusemann Solid State Materials Processing Institute of Material MechanicsHelmholtz-Zentrum HereonMax-Planck-Str.1Geesthacht 21502Germany Functional Magnesium Materials Institute of Metallic BiomaterialsHelmholtz-Zentrum HereonMax-Planck-Str.1Geesthacht 21502Germany Shanghai Key Laboratory of Materials Laser Processing and Modification Shanghai Jiao Tong UniversityDongchuan Road 800Shanghai 200240China Applied Materials and Manufacturing Energy and Environment DivisionPacific Northwest National LaboratoryPO Box 999RichlandWA 99352USA Production Technology Group Technisiche Universität IlmenauGustav-Kirchhoff-Platz 2Ilmenau 98693Germany Institute for Production Technology and Systems Leuphana University of LüneburgUniversitätsallee 1Lüneburg 21335Germany

In order to obtain Mg alloys with fine microstructures and high mechanical performances,a novel friction-based processing method,name as“constrained friction processing(CFP)”,was *** CFP,defect-free Mg-Zn-Ca rods with greatly refined grains and high mechanical properties were *** to the previous as-cast microstructure,the grain size was reduced from more than 1 mm to around 4μm within 3 s by a single process *** compressive yield strength was increased by 350%while the ultimate compressive strength by 53%.According to the established material flow behaviors by“tracer material”,the plastic material was transported by shear *** the base material to the rod,the material experienced three stages,*** by the tool,upward flow with additional tilt,followed by upward *** microstructural evolution was revealed by“stop-action”*** microstructural development at regions adjacent to the rod is mainly controlled by twinning,dynamic recrystallization(DRX)as well as particle stimulated nucleation,while that within the rod is related to DRX combined with grain growth.

关键词： Constrained friction processing Magnesium alloys Microstructure Mechanical properties Grain refinement Plastic deformation

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Ultrafast laser Additive-Subtractive Manufacturing of Planar Micro-Devices on Flexible Substrate

Ultrafast Laser Additive-Subtractive Manufacturing of Planar...

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International Conference on (ICEPT) Electronic Packaging Technology

作者： Luchan Lin Qianyi Zhang Zhuguo Li Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai China

ISBN: (数字)9798350353808

ISBN: (纸本)9798350353815

Flexible electronics has shown great promise in smart electronics, offering wearable, bendable, and foldable solutions from consumer electronics to healthcare. Wherein, reliable interconnection between polymer-based flexible substrates and metal film electrodes is essential to accommodate the stress and deformation failure during service. In this work, ultrafast laser hybrid additive-subtractive manufacturing has been proposed for reliable and highly efficient fabrication of microscale circuits on flexible substrate. Patterned metal structures can firstly be achieved with low-frequency ultrafast laser during subtractive process. The bond between remained metal film and polymer is strengthened with subsequent high-frequency ultrafast laser irradiation. High size resolution of the subtractive manufacturing and robust bond after the additive manufacturing allow reliable manufacturing of various micro devices on flexible substrate using ultrafast laser irradiation with different parameters.

关键词： Fabrication Radiation effects Metals Three-dimensional printing laser ablation Polymers Integrated circuit reliability

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Influence of Thermomechanical Process Parameters on Abnormal Grain Growth During Optimization of Grain Boundary Character Distribution for Grain Boundary Engineering and Intergranular Corrosion Resistance of 304 Austenitic Stainless Steel

SSRN

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SSRN 2024年

作者： Tokita, Shun Kokawa, Hiroyuki Sato, Yutaka S. Department of Materials Processing Graduate School of Engineering Tohoku University Japan Shanghai Key Laboratory of Materials Laser Processing and Modification China

Influence of thermomechanical parameters on abnormal grain growth during optimization of the grain boundary character distribution (GBCD) for grain boundary engineering (GBE) was studied. Specimens underwent various cold-rolling reductions and annealing treatments, with GBCD analyzed via EBSD. The study found that a 3% reduction ratio led to abnormal grain growth, increasing CSL boundary frequency and improving corrosion resistance. Long annealing times and higher temperatures (1220-1340 K) were crucial for reducing residual strain and enhancing intergranular corrosion resistance effectively. The 3% reduction consistently yielded higher CSL boundary frequency and better corrosion resistance due to distinct grain growth behavior. © 2024, The Authors. All rights reserved.

关键词： Corrosion resistance

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Effect of processing Parameters on the Microstructure And Corrosion Properties of Alcrfeconi High Entropy Alloy Coatings Fabricated By laser Cladding

SSRN

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SSRN 2024年

作者： Liu, Jingfu Bai, Minghan Xu, Wenjing Chu, Tongjiao Department of Material Processing Engineering School of Materials Science and Engineering Liaoning Technical University Fuxin123000 China Shanghai Key Laboratory of Materials Laser Processing and Modification Shanghai Jiao Tong University Shanghai200240 China

AlCrCoFeNi high entropy alloys (HEAs) have been successfully synthesized by laser cladding. The AlCrFeCoNi HEA coatings were composed of planar crystal, columnar grain, dendrite crustal and equiaxed grain from bottom to top. Face-centered cubic (FCC) was the major phase in coatings and its content decreased when increase laser power or reduce scanning speed. Precipitation in HEA coatings were Al-Ni enriched B2 phase and FeAl3 intermetallic compound. Interface zone had higher microhardness than cladding zone due to the addition of Fe from dilution role. The C2 (3 kW, 4 mm/s) and C9 (3.5 kW, 6 mm/s) coatings displayed the best corrosion resistance when taken the Ecoor (-0.327 V, -0.335 V), Icoor (0.236 μA·cm−2, 0.475 μA·cm−2) and Rct (224.2 kΩ/cm2, 121.1 kΩ/cm2) to consideration. Pitting dominated the corrosion process of AlCrFeCoNi HEA coatings. Large grain boundary area generating from fine grain in C2 and C9 coatings enhanced difficulty of ion transport along grain boundary. Then, multiple corrosion sites on surface promoted uniform corrosion and formed protective oxide film inhibiting serious pitting. This work provided an approach of laser cladding AlCrCoFeNi HEAs with different laser powers and scanning speeds, and insights into the correlation of anti-corrosion properties with microstructure of AlCrCoFeNi coatings. © 2024, The Authors. All rights reserved.

关键词： Pitting

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Effects of Active Gases on Droplet Transfer and Weld Morphology in Pulsed-Current NG-GMAW of Mild Steel

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Chinese Journal of Mechanical Engineering 2021年第4期34卷 249-261页

作者： Guoqiang Liu Xinhua Tang Qi Xu Fenggui Lu Haichao Cui Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai 200240China

The current research of narrow-gap gas metal arc welding(NG-GMAW)primarily focuses on improving the sidewall fusion and avoiding the lack-of-fusion ***,the high cost and operation difficulty of the methods limit the industrial *** this study,small amount of active gases CO_(2) and O_(2) were added into pure argon inert shielding gas to improve the weld formation of pulsed-current narrow-gap gas metal arc welding(NG-GMAW)of mild *** effects on droplet transfer and arc behavior were investigated.A high-speed visual sensing system was utilized to observe the metal transfer process and arc *** the proportion of CO_(2),being added into the pure argon shielding gas,changes from 5%to 25%,the metal transfer mode changes from pulsed spray streaming transfer to pulsed projected spray transfer,while it remains the pulsed spray streaming transfer when 2%to 10%O_(2) is *** CO2 and O_(2) are favorable to stabilizing arc and welding process.O_(2) is even more effective than CO_(2).However,O_(2) is more likely to cause slags on the weld surface,while CO_(2) can improve the weld appearance in some *** weld surface concavity in NG-GMAW is greatly influenced by the addition of active gas,but the weld width and weld penetration almost keep *** study proposes a new method which is beneficial to improving the weld bead formation and welding process stability.

关键词： Metal transfer Active gases Pulsed-current NG-GMAW Weld morphology

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High-Strength and Impermeable Sapphire/Aluminum Joints Fabricated by Ultrafast laser Microwelding: Microstructures and Joining Mechanism

SSRN

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SSRN 2024年

作者： Zuo, Xinde Lin, Luchan Hu, Yifan Ji, Junde Wu, Weiqing Zhang, Qianyi Li, Zhuguo Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai200240 China

In this work, robust joints of sapphire and aluminum were successfully achieved by direct ultrafast laser transmission microwelding. Effects of laser parameters on the microstructures and mechanical properties were comprehensively studied. The welding process highly depended on the laser ablated metal nanoparticles within the heterojunction, as well as the thermal accumulation under multiple laser pulses irradiation. It showed that lack of fusion at the sapphire/aluminum interface can occur due to the incomplete melting of ablated nanoparticles at low laser fluence ( 0.64 J/cm2). A nearly defect-free joint was obtained with max. shear strength of 128.9±7.8 MPa at room temperature, when the laser fluence was 0.56 J/cm2. The high shear strength can be attributed to the tortuous interface with wide elemental transition layer. Meanwhile, the welded sapphire/aluminum joints exhibited high reliability under extreme service temperatures, which the shear strength can reach 159.8±8.96 MPa at -50 ºC and 80.6±11.1 MPa at 200 ºC. The sealing tests also showed the excellent impermeability of laser welded sapphire/aluminum structure, confirming the micro-crack free joint formation. This work demonstrates the feasibility of using ultrafast laser to achieve high-quality sapphire/aluminum joint, which is promising in heat-dissipation substrate manufacturing in power semiconductor devices. © 2024, The Authors. All rights reserved.

关键词： Sapphire

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Effect of Ultra-Fine Grain Zone on Mechanical Properties of Cucrzr-Hastelloy X Bimetallic Structure Manufactured by laser-Directed Energy Deposition

SSRN

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SSRN 2024年

作者： Liang, Qian Wang, Yaqi Shao, Chendong Feng, Yueqiao Lu, Fenggui Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai200240 China

In this study, CuCrZr-Hastelloy X bimetallic structure featuring an ultra-fine grain zone (UFGZ) near the interface were fabricated by laser-directed energy deposition (L-DED). Samples with UFGZ were obtained with 300 °C preheating, whereas samples without preheating did not contain UFGZ. The microstructures and mechanical properties of samples with and without UFGZ were compared. The formation of UFGZ was attributed to the presence of a spherical phase near the interface, which was identified as Ni (Fe, Cr, Mo). Due to the higher melting point of Hastelloy X compared to CuCrZr, Ni elements mixed into CuCrZr with the flow of the molten pool, solidified first, and served as substrates for the heterogeneous nucleation, ultimately promoting the formation of UFGZ. With 300 °C preheating, the hardness of CuCrZr near the interface increased from 115.07 HV to 148.51 HV due to the presence of UFGZ. And the hardness gap near the interface decreased from 172.58 HV to 147.19 HV, which improved the uniformity of mechanical properties. Tensile test results indicated that the UFGZ altered the fracture mode from brittle to ductile. Samples with UFGZ exhibited ductile fracture, while those without UFGZ exhibited brittle fracture. At room temperature, the tensile strength of samples with UFGZ increased from 298.44 MPa to 347.05 MPa. For tests conducted at 400 °C, the tensile strength increased from 165.12 MPa to 229.53 MPa. This enhancement indicated that UFGZ could improve the strength and toughness of the interface, thereby enhancing the interfacial bonding strength. This study is of great significance for improving the interfacial bonding strength of CuCrZr-Hastelloy X bimetallic structures. © 2024, The Authors. All rights reserved.

关键词： Ternary alloys

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Femtosecond laser induced simultaneous functional nanomaterial synthesis,in situ deposition and hierarchical LIPSS nanostructuring for tunable antireflectance and iridescence applications

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Journal of materials Science & Technology 2021年第30期89卷 179-185页

作者： Ruijie Liu Dongshi Zhang Zhuguo Li Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China State Key Lab of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China

Femtosecond laser induced periodic surface structures(LIPSSs)are excellent biomimetic iridescent antireflective *** this work,we demonstrate the feasibility to develop tunable iridescent antireflective surfaces via simultaneous synthesis of functional metal-oxide nanomaterials,in situ deposition and hierarchical LIPSSs nanostructuring by means of femtosecond laser ablation(fs-LA)of tungsten(W)and molybdenum(Mo)in *** the scanning interval from 1μm to 20μm allows the modulation of particle deposition rates on *** the scan interval enables a higher particle deposition rate,which facilitates the development of better UV-to-MIR ultrabroadband antireflective surfaces with a less pronounced *** comparing the reflectance of hierarchical LIPSSs with different densities of loosely/tightly deposited particles,it is found that the deposited WO_(x)and MoO_(x)particle aggregates have high UV-to-MIR ultrabroadband absorbance,especially extraordinary in the MIR *** deposited particles which self-assembly into macroporous structures outperform tightly deposited particles for ultrabroadband antireflective *** presence of loosely deposited MoO_(x)and WO_(x)particle absorbers can cause up to 80%and 60%enhancement of antireflectance performances as compared to the tightly particle deposited LIPSSs *** stone of"fs-LA technique"with three birds of(particle generation,in situ deposition and LIPSS hierarchical nanostructuring)presented in this work opens up new opportunities to tune the reflectance and iridescence of metallic surfaces.

关键词： Broadband antireflectance Hierarchical nanostructures LIPSS UV-VIS-NIR-MIR Iridescence

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