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Improved mechanical properties of V-microalloyed dual phase steel by enhancing martensite deformability

Journal of Materials Science & Technology 2021年第16期75卷 139-153页

作者： Jingbin Zhang Yinrui Sun Zhijie Ji Haiwen Luo Feng Liu State Key Laboratory of Solidification Processing Northwestern Poly technical UniversityXi'an 710072China Analytical&Testing Center Northwestern Polytechnical UniversityXi'an710072China University of Science and Technology Beijing Beijing 100081China

A good combination of ultimate tensile strength(UTS)up to 1365 MPa and total strain to failure(StF)to 15.5%has been achieved due to deformable martensite in the invented vanadium-microalloyed dual-phase(DP)steel,which was manufactured by two-stage annealing of cold rolled steel *** employed extensive characterizations revealed that the ductile martensitic phase in this DP steel differentiated from ordinarily low-carbon martensitic lath in both morphology and lattice *** coherent orientation relationships between ferrite,reverse austenite,martensitic phase and vanadium carbide(VC)do exist,leading to a new martensitic transformation mechanism and resultant dual-phase ***,a detailed characterization including essential phase transformation analysis in combination with in situ TEM observation,shows that,all the essential processing including recrystallization,reverse austenitic and martensitic transformation,in debt to the particular effects of VC,can be recognized as phase transformations with higher thermodynamic driving force and higher kinetic energy barrier as compared to previously common processing,which actually changes the microstructure and,indirectly leads to higher strength and higher *** synergy of thermodynamics and kinetics can be generalized to improve mechanical properties of present steels.

关键词： Dual-phase steel Deformability Martensitic phase Thermodynamics Kinetics

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Indium oxide buffer layer for perovskite/Si 4-terminal tandem solar cells with efficiency exceeding 30%

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Journal of Energy Chemistry 2025年第3期102卷 189-196页

作者： Liming Du Can Li Yuhui Jiang Fangfang Cao Chunmei Jia Zhi Wan Rui Meng Jishan Shi Chuanxiao Xiao Zhe Liu Zhen Li State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU)Xi'an710072ShaanxiChina Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201ZhejiangChina Ningbo New Materials Testing and Evaluation Center Co. Ltd.Ningbo 315201ZhejiangChina

Perovskite/Si tandem solar cells(TSCs)present great potential to surpass the Shockley-Queisser limit of single-junction solar cells for further advancing the power conversion efficiency(PCE)of solar ***,the fabrication of TSCs usually encounters challenge of selecting suitable sputtering buffer layer(SBL)to prevent the bombardment during the transparent electrode ***,we introduce an indium oxide(In_(2)O_(3))buffer layer via e-beam deposition to fabricate semi-transparent perovskite solar cells(ST-PSCs).The optical transmittance and electrical conductivity of In_(2)O_(3)highly depend on the deposition *** deposition rate results in high ratio of metallic indium in the film,which causes severe parasitic absorption.A 20 nm-thick In_(2)O_(3)film deposited at lower rate demonstrated high conductivity,transmittance and robust protection during sputtering.A 1.68 eV ST-PSC incorporating this In_(2)O_(3)buffer layer exhibits a champion PCE of 20.20%,demonstrating the excellent optoelectronic and protective properties of In_(2)O_(3).When combined with a Si subcell,the 4-terminal TSC obtains a remarkable PCE of 30.04%,Importantly,the unencapsulated ST-PSC maintained 80%of initial PCE after 423 h of continuous light soaking in N_(2).This work has provided a facile and instrumental transparent SBL strategy for perovskite/Si TSCs.

关键词： E-beam deposition Sputtering Transparent electrode Perovskite solar cells In_(2)O_(3)

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Formation mechanism of partial stacking faults by incompletemixed-mode phase transformation: A case study of Fe-Ga alloys

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Journal of Materials Science & Technology 2022年第22期117卷 59-64页

作者： Tianzi Yang Tianyu Ma Feng Liu Xiaobing Ren Frontier Institute of Science and Technology State Key Laboratory for Mechanical Behavior of Materialsand MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterXi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of Solidification Processing and Analytical and Testing Center Northwestern Polytechnical UniversityXi’an 710072China Center for Functional Materials National Institute for Materials ScienceTsukuba 305-0047IbarakiJapan

Partial stacking faults(PSFs) formed by incomplete mixed-mode phase transformation have been found to exhibit unfixed slip distance of closely-packed planes unlike those of the deformation-induced stacking faults(SFs) with fixed distance. Though engineering PSFs can yield appealing properties, such as the enhanced damping capacity, understanding of the interaction between lattice distortion and atomic diffusion and their influences on forming PSFs is still far from being clear. Herein we performed a case study on aged Fe-Ga alloy that undergoes a mixed-mode phase transformation from body-centered cubic(BCC)to ordered face-centered cubic(FCC). The TEM investigations showed that the faulted {111}-FCC distance of the PSFs is shorter than a/6<112> of the typical {111}-<112> SFs in deformed FCC materials and the PSFs have disordered Fe and Ga arrangements. Further studies revealed that such PSFs will not be completely dissociated at FCC twin boundaries(TBs) even after long term isothermal aging. Consequently,the formation of PSFs can be ascribed to the transformation-dependent atomic ordering and lattice shear strain of the parent BCC lattice, where the diffusion-controlled glides of the PSFs-associated dislocations will accelerate atomic diffusions due to the dislocation-pipe effect along <112>-FCC direction, but may hinder the atomic diffusions across the {111}-FCC TBs due to the retarding effect. This study may add important insight into the defects process during mixed-mode phase transformation and broaden the knowledge of the interaction between concurrently-happened lattice distortion and atomic diffusion.

关键词： Stacking faults Mixed-mode phase transformation Diffusion Lattice distortion Fe-Ga alloy

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Aqueous Room-Temperature Phosphorescence from Assembled Phosphors for analytical Detection

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Chinese Journal of Chemistry 2023年第8期41卷 979-990页

作者： Peisheng Cao Qian Chen Peng Wu College of Chemistry Sichuan UniversityChengduSichuan610064 China Analytical&Testing Center State Key Laboratory of Hydraulics and Mountain River EngineeringSichuan UniversityChengduSichuan610064 China School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiangHenan453007 China

Comprehensive Summary Room-temperature phosphorescence(RTP)has gained much attention in organic light-emitting diodes(OLEDs),anti-counterfeiting,encryption and ***,efficient RTP is typically difficult due to the spin-forbidden transition nature and susceptibility to environment *** aqueous phase,such quenching is much more pronounced,leading to the collection of aqueous RTP even more *** systems(either organic or inorganic),provide an excellent microenvironment for accommodating of phosphors in aqueous phase,due to the excluding of typical phosphorescence quenchers(H2O and O2)and rigidification of phosphorescent molecules for inhibition of non-radiative transitions(molecular motions).Herein,we summarized the recent progress in harvesting RTP from aqueous systems via various assembling strategies,including small molecules,supramolecular inclusion,and inorganic *** specifically,the analytical explorations of these systems were discussed,from the perspective of the relationship between analytes and ***,the further developments of aqueous RTP analysis were also prospected.

关键词： Room-temperaturephosphorescence Luminescence Aqueous Assembly analytical detection

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Thermo-kinetic connectivity by integrating thermo-kinetic correlation and generalized stability

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Journal of Materials Science & Technology 2022年第32期127卷 225-235页

作者： Yuqing He Shaojie Song Jinglian Du Haoran Peng Zhigang Ding Huaiyu Hou Linke Huang Yongchang Liu Feng Liu State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Analytical&Testing Center Northwestern Polytechnical UniversityXi’an 710072China School of Materials and Chemical Engineering Xi’an Technological UniversityXi’an 710021China Nano and Heterogeneous Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China State Key Lab of Hydraulic Engineering Simulation and Safety School of Materials Science&EngineeringTianjin UniversityTianjin 300072China

Designing structured materials with optimized mechanical properties generally focuses on engineering microstructures,which are closely determined by the processing routes,such as phase transformations(PTs)and plastic deformations(PDs).Both PTs and PDs follow inherent trade-off relation between thermodynamic driving force ΔG and kinetic energy barrier Q,i.e.,so-called thermo-kinetic *** analyzing nucleation and growth and proposing a conception of negative driving force integrating strain energy,interface energy and any kind of energy that equivalently inhibits the PT itself,ΔG^(S),unified expressions for the thermo-kinetic correlation and generalized stability(GS)were derived for three kinds of PTs,i.e.,diffusive PTs with simultaneously decreasedΔG and increased Q,diffusive PTs with simultaneously increasedΔG and decreased Q,and displacive PTs with simultaneously increased ΔG and decreased *** leads to so-called thermo-kinetic connectivity by integrating the thermo-kinetic correlation and the GS,where,by application in typical PTs,it was clearly shown,a criterion of high ΔG-high GS can be predicted by modulating chemical driving force,negative driving force and kinetic energy barrier for diffusion or *** thermo-kinetic connectivity,analogous procedure for dislocation evolution upon PDs was performed,and materials design in terms of the highΔG-high GS criterion was discussed and prospected.

关键词： Thermo-kinetic correlation Negative driving force Generalized stability Thermo-kinetic connectivity

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Enhanced damping capacity of ferromagnetic Fe-Ga alloys by introducing structural defects

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Journal of Materials Science & Technology 2021年第25期84卷 173-181页

作者： Ruihua Qiao Junming Gou Tianzi Yang Yiqun Zhang Feng Liu Shanshan Hu Tianyu Ma Frontier Institute of Science and Technology State Key Laboratory for Mechanical Behavior of Materialsand MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterXi’an Jiaotong UniversityXi’an710049China State Key Laboratory of Solidification Processing and Analytical&Testing Center Northwestern Polytechnical UniversityXi'an710072China School of Materials Science and Engineering Zhejiang UniversityHangzhou310027China

The irreversible motion of magnetic domain walls in ferromagnets can dissipate a large portion of the elastic energy,and the associated damping capacity is proportional to the magnetostriction *** contrast,here we found that the damping capacity of the large magnetostriction Fe-Ga alloys can be enhanced by 2-3 times through introducing structural defects including interfacial dislocations and stacking faults,despite that these defects deteriorate the *** structural defects were introduced by aging the BCC(body-centered-cubic)solution-treated precursor,for which the formation of mechanically harder FCT(face-centered-tetragonal)and/or FCC(face-centered-cubic)phases can result in high-density partial dislocations at the semi-coherent phase interfaces and quasi-periodically stacked nano-layer substructure inside the FCC *** structural defects act as extra damping sources besides the magnetic domain walls because the structural accommodation of the semi-coherent phase interfaces between BCC and FCT/FCC nanoprecipitates with different elastic moduli and the nano-layer substructure towards long-range ordered periodical stacking can dissipate a large portion of mechanical *** findings suggest that introducing structural defects provides fresh freedom to design high damping ferromagnetic materials.

关键词： Ferromagnets Damping capacity Defects Magnetostriction Fe-Ga alloy

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Ab-initio investigation for the microscopic thermodynamics and kinetics of martensitic transformation

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Progress in Natural Science:Materials International 2021年第1期31卷 121-128页

作者： Tianle Wang Jinglian Du Shizhong Wei Feng Liu State Key Laboratory of Solidification Processing Northwestern Polytechnical University National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials Henan University of Science and Technology Analytical & Testing Center Northwestern Polytechnical University

Martensitic transformation(MT) path in Fe-based alloys remains uncertain in spite of decades of research. Lots of relevant works, which mostly focused on the simplest Bain path, have been completed by the state-of-the-art firstprinciples methods based on density functional theory. In this work, the element effects on microscopic thermodynamics and kinetics of the MT are investigated in terms of two different paths, including the well-known shear dominated Bogers-Burgers path and a recently proposed shuffle dominated path. Adding common elements, e.g. Ni, Mn, Cr, Si and C, into steel could induce different kinetics of the MT, as reflected by the energy barrier, which further determines the physically realistic MT path for different alloys. Furthermore, the addition of 3 d transition metals may adjust the transformation equilibrium between the tetragonal α martensite and the hexagonal ε martensite, as reflected by their inverse effect on the energy barrier for the α MT and the stacking fault energy relating to the ε formation. An expected correlation between the thermodynamic driving force and the kinetic energy barrier for the MT is confirmed in binary Fe–Ni and Fe–Cr systems with changing the concentration of the alloying elements. These two paths for the MT are elaborately compared and discussed to reveal the nature of atomic movement in the MT, dominated by shear or shuffle.

关键词： Martensitic transformation First-principles Element effect Bogers-Burgers path

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Portevin-Le Chatelier(PLC)effect induced by different deformation mechanisms in Ni-25Mo-8Cr alloy during high-temperature tensile deformation

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Rare Metals 2025年第1期44卷 591-607页

作者： Ming Yang Tao Luo Lei Lei Yun Jiang Pan-Zhi Wang Fa-Hong Xu School of Materials and Metallurgy Guizhou UniversityGuiyang 550025China School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072China School of Physics and Optoelectronic Engineering Yangtze UniversityJingzhou 434023China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Guizhou Special Equipment Inspection and Testing Institute Guiyang 550025China

Uniaxial tensile testing explored the Portevin-Le Chatelier(PLC)effect in nickel-based superalloys featuring high Mo/Cr mass ratios,focusing on the influence of variations in the initial microstructure on the deformation behavior at room and elevated *** results indicated that the PLC effect was observed solely in the high-temperature tensile ***,the deformation mechanisms and characteristics of the PLC effect varied with different initial *** solution(SS)and over-aged(OA)samples exhibited C-type serrations,while under-aged(UA)and peak-aged(PA)specimens,featuring short-and long-range ordered phases,respectively,exhibited A+B type serrations in their tensile *** evolution from the SS to the UA,PA and OA states changed their stacking fault energy(SFE),leading to a sequential transformation in the plastic deformation mechanisms during high-temperature tensile deformation:stacking fault(SF)→nanotwin→microtwin→SF.C-type serrations in the SS samples were associated with high solute-atom contents and SF *** PLC effects in the UA and PA samples were predominantly caused by solute atom pinning *** precipitates and twins were not the primary drivers of the PLC effect,they impeded dislocation migration,exacerbated solute-atom segregation and enhanced dislocation pinning,generating A+B-shaped *** the OA specimens,precipitated phases induced interfacial mismatch under thermal-force *** shearing of the precipitated phase and subsequent re-dissolution facilitated the formation of C-type serrations,whose PLC effect was induced by the combined action of dynamic strain aging(DSA),SFs of the matrix and diffusion-controlled pseudo-locking mechanisms.

关键词： Ni-Mo-Cr superalloy Pt_(2)Mo precipitates PLC effect Deformation mechanism

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Precursor compound enabled formation of aqueous-phase CdSe magic-size clusters at room temperature

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Nano Research 2022年第3期15卷 2634-2642页

作者： Min Zhao Qingyuan Chen Yongcheng Zhu Yuehui Liu Chunchun Zhang Gang Jiang Meng Zhang Kui Yu School of Chemical Engineering Sichuan UniversityChengdu 610065China Institute of Atomic and Molecular Physics Sichuan UniversityChengdu 610065China Engineering Research Center in Biomaterials Sichuan UniversityChengdu 610065China Analytical&Testing Center Sichuan UniversityChengdu 610065China State Key Laboratory of Polymer Materials Engineering Sichuan UniversityChengdu 610065China

The formation pathway of aqueous-phase colloidal semiconductor magic-size clusters(MSCs)remains *** the present work,we demonstrate,for the first time,a precursor compound(PC)-enabled formation pathway of aqueous-phase CdSe MSCs exhibiting a sharp absorption peaking at about 420 nm(MSC-420).The CdSe MSC-420 is synthesized with CdCl2 and selenourea as the respective Cd and Se sources,and with 3-mercaptopropionic acid or L-cysteine as a *** featureless CdSe PCs form first in the aqueous reaction batches,which transform to MSC-420 in the presence of primary *** coordination between primary amine and Cd^(2+)on PCs may be responsible to the PC-to-MSC *** increasing the reactant concentrations or decreasing the CdCl_(2)-ligand feed molar ratios,the Cd precursor self-assembles into large aggregates,which may encapsulate the resulting CdSe PCs and inhibit their transformation to *** present study sheds essential light on the syntheses and formation mechanisms of nanocrystals.

关键词： aqueous magic-size cluster precursor compound formation pathway self-assembly precursor configuration

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Characterization of Al2O3 coating of Nb fiber-reinforced TiAl composite

SSRN

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SSRN 2024年

作者： Wang, Yan Gao, Xiangyu Zhou, Mi Li, Jinguang Analytical & Testing Center Northwestern Polytechnical University Shaanxi Xi’an710072 China State Key Laboratory of Solidification Processing School of Materials Science Northwestern Polytechnical University Xi’an710072 China

The Al2O3 coating was synthesized on surface of the Nb fiber via cathodic plasma electrolytic deposition (CPED) method. The microstructure and composition of the coating were elaborately analyzed. The results revealed that compact and uniform Al2O3 is fully contact with TiAl matrix and Nb fiber, which was composed of κ-Al2O3 and α-Al2O3 and successfully hold back the oxidation reactions at the juncture and refrain from formation of detrimental phases. Especially, three-dimensional characterization information can be obtained from two-dimensional converging beam electron diffraction (CBED) pattern, from which the crystal constants of Al2O3 can be obtained directly under only one applicable zone axis. © 2024, The Authors. All rights reserved.

关键词： Aluminum oxide

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