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Pd cluster decorated free standing flexible cathode for high performance Li-oxygen batteries

Nano Research 2024年第4期17卷 2678-2686页

作者： Liang Guo Guoliang Zhang Ruonan Yang Dongmei Zhang Xiuqi Zhang Han Yu Xia Li Feng Dang Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials Ministry of EducationShandong UniversityJinan 250061China

As a promising candidate for the next generation energy storage system,rechargeable lithium-oxygen batteries(LOBs)still face substantial challenges caused by insulating discharge products that preclude their practical *** highly efficient cathode catalysts capable of facilitating formation/decomposition of discharge products is considered as an essential approach towards high performance ***,Pd decorated Te nanowires(Pd@Te NWs)were synthesized as advanced catalyst in LOBs to maximize Pd utilization and achieve synergistic effect,in which Pd clusters were uniformly grown on Te substrate though regulating the Pd:Te ***,Pd@Te nanowires assembled into an interpenetrating network-like structure by vacuum filtration and employed as flexible cathode,enabling LOBs achieved an ultralong 190 cycles stability and a superior specific capacity of 3.35 mAh·cm^(-2).Experimental studies and density functional theory(DFT)calculations reveal the excellent catalytic ability of Pd@Te and synergistic catalytic mechanism of Pd and Te,in which uniform electron distribution,extensive electron exchange,and large adsorption distance between Pd cluster and discharge products promote homogeneous adsorption/desorption of discharge products,while the high adsorption energy of Te substrate for Li species reduces the initial dynamical energy barrier during discharging *** current work provides viable strategy to design composite catalysts for flexible cathode of LOBs with synergistic catalytic effects.

关键词： flexible lithium-oxygen batteries Pd@Te synergistic catalysis cathode catalysts density functional theory(DFT)calculation

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Elucidating the process mechanism in Mg-to-Al friction stir lap welding enhanced by ultrasonic vibration

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Journal of Magnesium and Alloys 2025年第1期13卷 338-355页

作者： Ming Zhai Lei Shi ChuanSong Wu MOE Key Lab for Liquid-Solid Structure Evolution and Materials Processing Institute of Materials JoiningShandong UniversityJinan 250061 China

The composite structures/components made by friction stir lap welding(FSLW)of Mg alloy sheet and Al alloy sheet are of wide application potentials in the manufacturing sector of transportation *** further improve the joint quality,the ultrasonic vibration(UV)is exerted in FSLW,and the UV enhanced FSLW(UVeFSLW)was developed for making Mg-to-Al dissimilar *** numerical analysis and experimental investigation were combined to study the process mechanism in Mg/Al *** equation related to the temperature and strain rate was derived to calculate the grain size at different locations of the weld nugget zone,and the effect of grain size distribution on the threshold thermal stress was included,so that the prediction accuracy of flow stress was further *** such modified constitutive equation,the numerical simulation was conducted to compare the heat generation,temperature profiles and material flow behaviors in Mg/Al UVeFSLW/FSLW *** was found that the exerted UV decreased the temperature at two checking points on the tool/workpiece interface from 707/671 K in FSLW to 689/660 K in UVeFSLW,which suppressed the IMCs thickness at Mg-Al interface from 1.7μm in FSLW to 1.1μm in *** exerted UV increased the horizontal materials flow ability,and decreased the upward flow ability,which resulted in the increase of effective sheet thickness/effective lap width from 2.01/3.70 mm in FSLW to 2.04/4.84 mm in ***,the ultrasonic vibration improved the tensile shear strength of Mg-to-Al lap joints by 18%.

关键词： Friction stir lap welding Mg-to-Al dissimilar alloys Ultrasonic vibration Numerical simulation Experimental investigation

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Intermetallic Compounds Formation in Dissimilar Friction Stir Welding of Mg/Cu Alloys

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Acta Metallurgica Sinica(English Letters) 2024年第9期37卷 1523-1532页

作者： Xue Li Qingzhen Zhao Hao Su Ji Chen Chuansong Wu MOE Key Lab for Liquid-Solid Structure Evolution and Materials Processing Institute of Materials JoiningShandong UniversityJinan250061China

Joining dissimilar Mg/Cu alloys was still an intractable problem because of the excessive intermetallic compounds(IMCs)and poor mechanical properties using conventional welding *** the present study,friction stir welding was employed for the butt joining of dissimilar AZ31B Mg-alloy and T2 pure Cu ***-free Mg/Cu joints were obtained with Mg-RS and Cu-AS configuration,at a welding speed of 50 mm/min and tool rotating speeds of 325 r/min,625 r/min and 925 r/*** the joining interface,both Mg_(2)Cu and MgCu_(2) IMC phases were observed,with a clear,uniform and continuous IMCs layer composed of two sub-layers,layer-A of Mg+Mg_(2)Cu and layer-B of Mg_(2)Cu+MgCu_(2).The maximum ultimate tensile strength of the Mg/Cu friction stir welding joint reached 130 MPa at 925 r/min due to enhanced mechanical interlocking between Mg and Cu,as well as sufficient metallurgical bonding at the joining interface with an IMCs layer thickness in the range of 1.0-2.0μm.

关键词： Friction stir welding Magnesium Copper Intermetallic compounds Mechanical properties

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Viscosity in metallic supercooled liquids obtained by fast scanning calorimetry and its application to thermoplastic forming

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Science China(Physics,Mechanics & Astronomy) 2025年第6期68卷 23-32页

作者： Min Liu Zheng Wang Yijun Ding Senkuan Meng Lina Hu Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong UniversityJinan 250061China

Viscosity is a crucial dynamic property for alloy *** alloy liquids with glass-forming ability,their viscosity undergoes a change of more than ten orders of magnitude upon cooling,and eventually,a transition from liquid to glassy state occurs when viscosity reaches 1012 Pa ***,the viscosity measurement in the supercooled liquid region(SLR)has been an experimental ***,in this work,by combining conventional and fast scanning calorimeters,the accurate viscosity of supercooled liquids for Au_(49)Ag_(5.5)Pd_(2.3)Cu_(26.9)Si_(16.3) and Zr_(44)Ti_(11)Cu_(10)Ni_(10)Be_(25) metallic glasses(MGs)was measured over a wide viscosity range of 10^(6)-10^(12) Pa ***,the viscosity range of 10^(6)-10^(8) Pa s is generally selected for thermoplastic forming(TPF),which takes advantage of the dramatic softening that MGs exhibit after being heated into the *** further gave the TPF process window covering the range of processing temperature and time by utilizing the obtained viscosity data and timetemperature-transformation *** optimal time window avoiding property degradation was also determined,based on that there was no marked effect on the mechanical properties of MGs when crystallinity was below~5%.Our findings not only provide the accurate viscosity data in the SLR,but also determine the optimal process parameters for the TPF process.

关键词： metallic glass viscosity supercooled liquid thermoplastic forming fast scanning calorimetry

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Deep-trap ultraviolet persistent phosphor for advanced optical storage application in bright environments

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Light(Science & Applications) 2024年第11期13卷 2634-2648页

作者： Xulong Lv Yanjie Liang Yi Zhang Dongxun Chen Xihui Shan Xiao-Jun Wang Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials Shandong UniversityJinan 250061China Department of Physics Georgia Southern UniversityStatesboroGA 30460USA

Extensive research has been conducted on visible-light and longer-wavelength infrared-light storage phosphors,which are utilized as promising rewritable memory media for optical information storage applications in dark ***,storage phosphors emitting in the deep ultraviolet spectral region(200–300 nm)are relatively ***,we report an appealing deep-trap ultraviolet storage phosphor,ScBO_(3):Bi^(3+),which exhibits an ultranarrowband light emission centered at 299 nm with a full width at half maximum(FWHM)of 0.21 eV and excellent X-ray energy storage *** persistently stimulated by longer-wavelength white/NIR light or heated at elevated temperatures,ScBO_(3):Bi^(3+)phosphor exhibits intense and long-lasting ultraviolet luminescence due to the interplay between defect levels and external stimulus,while the natural decay in the dark at room temperature is extremely weak after X-ray *** impact of the spectral distribution and illuminance of ambient light and ambient temperature on ultraviolet light emission has been studied by comprehensive experimental and theoretical investigations,which elucidate that both O vacancy and Sc interstitial serve as deep electron traps for enhanced and prolonged ultraviolet luminescence upon continuous optical or thermal *** on the unique spectral features and trap distribution in ScBO_(3):Bi^(3+)phosphor,controllable optical information read-out is demonstrated via external light or heat manipulation,highlighting the great potential of ScBO_(3):Bi^(3+)phosphor for advanced optical storage application in bright environments.

关键词： ultraviolet ambient luminescence

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Nanoscale analysis of interfacial structure and its effects on mechanical properties of Mg/Al laminate reinforced by TiB_(2) particles

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Journal of Magnesium and Alloys 2025年第3期13卷 1310-1324页

作者： Lihua Qian Liang Chen Biaohua Que Kaiqiang Shen Guoqun Zhao Cunsheng Zhang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong UniversityJinanShandong 250061PR China

Fabricating Mg/Al laminate is an effective strategy to circumvent the inherently low formability and poor corrosion resistance of Mg ***,Mg/Al laminate with good bonding quality and mechanical properties was successfully fabricated via porthole die co-extrusion process using ZK60 Mg and TiB_(2)/6061Al composite as constituted *** the results from microstructural characterization and mechanical testing,the effects of extrusion temperature on microstructure,interfacial structure,element diffusion,and mechanical properties were *** results show that Mg/Al laminate achieves a sound welding quality by mechanical bonding and diffusion *** obvious intermetallic compounds(βandγ)layer forms at Mg/Al interface,and its thickness increases to 8.3μm as the extrusion temperature reaches 400℃.High extrusion temperature promotes the dynamic recrystallization and grain growth of Mg and Al layers,while the dislocation density decreases.β/γinterface shows a coherent feature,whileγ/Mg interface is semi-coherent with a locally ordered transition zone of 4.5 *** rich Mg and Cr layers are found at TiB_(2)/6061 interface,which is conducive to improving the bonding *** the extrusion temperature is 370℃,the thickness of diffusion layer is around 5.0μm,and the bonding strength reaches 18.68 MPa,resulting in the best comprehensive mechanical *** work provides a new direction for the development of Mg/Al laminate with excellent strength and ductility.

关键词： Mg/Al Extrusion Microstructure Interface Dislocation density

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evolution of microstructures and intermetallic compounds at bonding interface in friction stir welding of dissimilar Al/Mg alloys with/without ultrasonic assistance

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Journal of materials Science & Technology 2023年第8期139卷 31-46页

作者： Junjie Zhao ChuanSong Wu Lei Shi Hao Su MOE Key Lab for Liquid-Solid Structure Evolution and Materials Processing Institute of Materials JoiningShandong UniversityJinan 250061China

Complete understanding of the evolution behaviors of the microstructures and intermetallic compounds(IMCs)along the interface materials flow path in friction stir welding(FSW)of dissimilar Al to Mg alloys is of great *** this study,conventional FSW and ultrasonic vibration enhanced FSW(UVeFSW)experiments of Al/Mg alloys were performed,and the instantaneous evolution features of the interface materials around the tool were"frozen"by using the"sudden stop"and simultaneous cooling *** microstructures and IMCs formation at different locations around the exit hole were observed and characterized by scanning electron microscope,energy dispersive spectrometer and transmission elec-tron *** was found that before the materials started to deposit near the back of the tool,“IMC+Mg+IMC+Al”multilayer microstructure and simple IMC layer with(β+γ)sequentially emerged on the Al/Mg *** the application of ultrasonic vibration,the multi-layered interface structure only appeared at the middle stage of materials flow around the pin,and ultrasonic vibration just began to play a suppression role on the growth of two sub-layers IMC at a position where the materials *** assistance of ultrasonic vibration in UVeFSW,the tool drove a larger volume of Mg alloy to move toward the retreating side,and the final IMCs thickness was thinner than that in FSW.

关键词： Friction stir welding Aluminium alloy Magnesium alloy Microstructure evolution Intermetallic compounds(IMCs) Bonding interface Ultrasonic vibration

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Construction of an Arrhenius constitutive model for Mg-Y-Nd-Zr-Gd rare earth magnesium alloy based on the Zener-Hollomon parameter and objective evaluation of its accuracy in the twinning-rich intervals

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Journal of Magnesium and Alloys 2024年第7期12卷 2890-2908页

作者： Luyi Han Xiangjian Zhu Dejin Wei Yanan Yu Guangchun Wang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong UniversityJinanShandong 250061PR China

According to a high-temperature compression test of rare earth magnesium alloy(WE43),a strain-compensated constitutive model of the Arrhenius equation based on Zener-Hollomon parameters was established,and the rheological behaviors were *** model exhibited relatively serious prediction distortion in the low-temperature and high-strain rate parameter interval,and its accuracy was still unsatisfactory even after modification by a correction operator considering the coupling of temperature and strain *** microstructure characterization and statistical analysis showed that a large number of twinning occurred in the parameter intervals with prediction *** occurrence of twinning complicated the local internal stress distribution by drastically changing the crystal orientation and led to significant fluctuations in the macroscopic strain-stress and hardening curves relative to the rheological processes dominated by the dislocation and softening mechanisms,making the logarithm of the strain rate and stress deviate from the linear *** twinning phenomenon was greatly influenced by the temperature and strain ***,the influence mechanism on twinning behavior was analyzed from the perspective of the interaction of dislocation and twinning.

关键词： RE magnesium alloy Hot deformation Zener-Hollomon parameters Arrhenius constitutive model Dislocation Twinning

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Highly efficient broadband near-infrared luminescence phosphors Ca3MgSn0.5Zr0.5Ge3O12:Pr3+,Cr3+ for multifunctional applications in pc-LEDs field

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Journal of Rare Earths 2025年第6期43卷 1110-1119页

作者： Xiaole Xing Shanshan Huang Yining Wang Lingkang Yu Yixin Sun Mengmeng Shang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education) School of Materials Science and EngineeringShandong University School of Chemistry and Pharmaceutical Engineering Huanghuai University

Exploring high-performance broadband near-infrared（NIR） emitting materials is crucial for the development of NIR *** this study,Ca3MgSn0.5Zr0.5Ge3O12:Cr3+and rare earth ion Pr3+co-doped Ca3MgSn0.5Zr0.5Ge3O12:Pr3+,Cr3+phosphors were successfully *** utilizing time-resolved emission spectroscopy（TRES）,photo luminescence（PL） spectra,and fluorescence decay curve,the Ca3MgSn0.5Zr0.5Ge3O12:Cr3+phosphor is determined to exhibit a broadband emission（650-1150 nm）with a peak at 795 nm due to Cr3+occupying multiple cationic sites,Ca3MgSn0.5Zr0.5Ge3O12:0.1Cr3+has excellent thermal stability（86%@425 K）,and co-doping Pr3+ions into Ca3MgSn0.5Zr0.5Ge3O12:0.1Cr3+obtains highly efficient NIR *** Ca3MgSn0.5Zr0.5Ge3O12:0.01 Pr3+,0.1 Cr3+phosphor has quantum yield of 89.4% thanks to the energy transfer effect from Pr3+to Cr3+.The fabricated NIR phosphorconverted light emitting diode（pc-LED） by integrating the blue chip with Ca3MgSn0.5Zr0.5Ge3O12:0.01 Pr3+,0.1Cr3+has diverse applications including night vision,non-destructive testing,and medical imaging.

关键词： Ca3MgSn0.5Zr0.5Ge3O12:Cr3+ Co-doping Pr3+ Energy transfer Multi-site occupation NIR emission Rare earths

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Magneto-volume effect in Fe_(n)Ti_(13-n)clusters during thermal expansion

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Chinese Physics B 2023年第4期32卷 78-86页

作者：黄建蒋妍彦李志超张迪钱俊平李辉 Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of EducationShandong UniversityJinan 250061China

Ab initio molecular dynamics calculations have been carried out to search for the ground state structure of Fe_(n)Ti_(13-n)clusters and measure the thermal expansion of Fe_(n)Ti_(13-n).The volume of Fe_(n)Ti_(13-n)clusters during thermal expansion is jointly determined by anharmonic interaction and magneto-volume *** has been found that Fe_(6)Ti_(7),Fe_9Ti_(4),Fe_(11)Ti_(2),and Fe_(13)clusters can exhibit the remarkable magneto-volume effect with abnormal volume behaviors and magnetic moment behaviors during thermal expansion.A prerequisite for the magneto-volume effect of Fe_(n)Ti_(13-n)clusters during thermal expansion has been revealed and the magnitude of the magneto-volume is also approximately ***,the magneto-volume behaviors of Fe_(n)Ti_(13-n)clusters are qualitatively characterized by the energy contour *** results shed light on the mechanism of the magneto-volume effect in Fe_(n)Ti_(13-n)clusters during thermal expansion,which can guide the design of nanomaterials with zero expansion or even controllable expansion properties.

关键词： Fe_(n)Ti_(13-n)cluster thermal expansion magneto-volume effect magnetic moment

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