Materials Science and Engineering: A最新文献

{"title":"Enhancement of the mechanical properties of semi-stationary bobbin tool friction stir welded joints in AA2219 through post-weld heat treatment","authors":"Guilherme N. Rezende ,&nbsp;Matteo Bernardi ,&nbsp;Marius Hoffmann ,&nbsp;Luciano Bergmann ,&nbsp;Guilherme Zepon ,&nbsp;Benjamin Klusemann","doi":"10.1016/j.msea.2024.147498","DOIUrl":"10.1016/j.msea.2024.147498","url":null,"abstract":"<div><div>This research investigates the enhancement of AA2219 joints formed by semi-stationary bobbin tool friction stir welding (SSBT-FSW) through post-weld heat treatments. Although solid-state processes such as SSBT-FSW are able to produce superior welds without common defects seen in conventional fusion welding of aluminum alloys of the 2XXX series, the thermal cycle in SSBT-FSW can deteriorate mechanical properties by causing precipitate dissolution and over-aging. The research proposes using a heat treatment sequence to induce solubilization and re-recipitation of precipitates in a more favorable distribution, re-activating the precipitation-hardening. Since abnormal grain growth is very difficult to avoid during heat treatments of welded samples, the analysis focuses on the evolution of the microstructure during solution heat treatment and on the influence of grain size, texture, and precipitate distribution on grain growth. The origin and evolution of the grain growth during solution heat treatment have been observed. Hardness measurements and tensile tests show that post-weld heat treatments can effectively restore the mechanical properties of the joints to the levels of those of the base material. Understanding the relationships between microstructure, abnormal grain growth and mechanical behavior of the joints aids the optimization of the SSBT-FSW process for broader industrial application, especially in the aerospace industry, where high-performance aluminum welded structures are critical.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"920 ","pages":"Article 147498"},"PeriodicalIF":6.1,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of carbon on the microstructures and mechanical properties of non-equiatomic Cr15Cu5Fe20Mn25Ni35 high-entropy alloy","authors":"Majid Vaghari,&nbsp;Kamran Dehghani","doi":"10.1016/j.msea.2024.147525","DOIUrl":"10.1016/j.msea.2024.147525","url":null,"abstract":"<div><div>This study investigates the effects of carbon addition on the microstructure and mechanical properties of a single-phase face-centered cubic (FCC) Cr₁₅Cu₅Fe₂₀Mn₂₅Ni₃₅ high-entropy alloy (HEA) at room temperature. The alloy was identified as a promising single-phase FCC candidate through systematic thermodynamic calculations using the Calculation of Phase Diagrams (CALPHAD) method and Thermo-Calc software, with validation from X-ray diffraction analysis of the as-cast alloy. The introduction of carbon at concentrations of 0.5 and 1 atomic percent increased the yield strength from 250 MPa to 300 MPa and 350 MPa, respectively, and tensile strength from 500 MPa to 550 MPa and 600 MPa, while enhancing elongation to failure from 20 % to 25 % and 30 %. Microstructural characterization using X-ray diffraction, scanning electron microscopy, and electron backscatter diffraction revealed no alteration in the FCC structure, but a refinement of grain size from 10 μm to 5 μm and a more random crystallographic texture. Additionally, transmission electron microscopy (TEM) analysis demonstrated dense, parallel deformation twins in the alloy with 1 atomic percent of carbon, confirming that twinning significantly contributes to improved ductility and strain hardening. The strengthening effects of carbon are attributed to solid solution strengthening and mechanisms such as twinning. These findings provide valuable insights into tailoring HEA properties through interstitial modifications, contributing to the broader understanding of materials science and the development of high-performance alloys for various applications.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"919 ","pages":"Article 147525"},"PeriodicalIF":6.1,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrosion fatigue damage and mechanism evolution of Q420B steel in simulated dry/wet cyclic coastal atmosphere","authors":"Hongqiang Chu ,&nbsp;Yanjin Guan ,&nbsp;Jiqiang Zhai ,&nbsp;Fengjiao Chen ,&nbsp;Jun Lin","doi":"10.1016/j.msea.2024.147515","DOIUrl":"10.1016/j.msea.2024.147515","url":null,"abstract":"<div><div>Q420B low-alloy high-strength steel is the primary material used in China's ultra-high voltage (UHV) transmission towers. In coastal regions, the interaction of wind-induced fatigue and atmospheric corrosion makes it vulnerable to corrosion fatigue (CF), endangering grid safety. This study investigates the CF behavior and underlying mechanisms of Q420B steel, utilizing a specially designed dry/wet cyclic CF device. The results indicate that Q420B steel exhibits high sensitivity to CF, with the failure mechanism being controlled by anodic dissolution and hydrogen embrittlement. The crack initiation process unfolds in three stages: the formation of surface corrosion products, pitting corrosion beneath the rust layer, and nucleation of corrosion fatigue cracks (CFCs). Under low peak stress, anodic dissolution, hydrogen diffusion, and plastic deformation at the crack tip collectively hasten the propagation of CFCs. Under high peak stress, the mechanical effect at the crack tip dominates CFCs propagation. These insights are vital for optimizing the design and maintenance of UHV transmission towers.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"919 ","pages":"Article 147515"},"PeriodicalIF":6.1,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-temperature compressive behaviour and failure mechanism of high entropy carbides modified by Cr addition","authors":"Yichen Wang ,&nbsp;Zanlin Cheng ,&nbsp;Vladimír Girman ,&nbsp;Richard Sedlák ,&nbsp;Ján Dusza ,&nbsp;Michael J. Reece ,&nbsp;Chengyu Zhang","doi":"10.1016/j.msea.2024.147532","DOIUrl":"10.1016/j.msea.2024.147532","url":null,"abstract":"<div><div>The effect of Cr addition on the compressive and failure behaviour of high entropy carbides (HECs) at temperatures of 1400–1600 °C and stresses of 200–300 MPa was investigated by comparing two groups of ceramics: (Zr,Nb,Hf,Ta)C (HEC4) and HEC4 with Cr addition (HEC5-Cr), and 8-metal carbides (Ti,Zr,Hf,V,Nb,Ta,Mo,X)C with W or Cr addition for X. The HEC-Cr systems showed significantly lower compressive strain than Cr-free HECs under identical conditions. HEC4 showed a strain of about 1.4 % at 1500 °C under 200 MPa for 6 h, while HEC5-Cr demonstrated only 0.05 % strain. To the best of our knowledge, HEC5-Cr exhibited the lowest steady creep rate among carbides reported under similar conditions. Creep is almost negligible in HEC-Cr ceramics, mostly because the grain boundary sliding and cracking were restricted by the strong Cr-rich grain boundaries. The Cr addition changed the failure behaviour of HECs: the Cr-free HEC samples shattered into numerous pieces due to severe grain boundary deformation, the HEC-Cr samples typically fractured into two parts with transgranular failure. The strategic addition of Cr to HECs enhances compressive performance and modifies fracture behaviour, indicating their potential as superior materials for high-stress, high-temperature applications.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"920 ","pages":"Article 147532"},"PeriodicalIF":6.1,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Additive manufacturing Cr-Mo-Si-V steel: Systematic parameter assessments, precipitation behavior of in-situ VC-M23C6 and strengthening mechanisms","authors":"Qing Wang ,&nbsp;Deyin Kong ,&nbsp;Xingran Li ,&nbsp;Shihui Zhou ,&nbsp;Zhihui Zhang","doi":"10.1016/j.msea.2024.147504","DOIUrl":"10.1016/j.msea.2024.147504","url":null,"abstract":"<div><div>To obtain the H13 steel with defect-structure-performance compatibility fabricated by laser powder bed fusion (LPBF), a systematic optimisation framework was employed to get optimal process window in this paper. Subsequently, the microstructural evolutions, nanoprecipitation behaviors and strengthening mechanisms of H13 steels built at recommended parameters were in-depth analyzed. The evolutions of submicron sized cellular and columnar dendritic crystal were explained as well as the phase transformation process including lath martensite with a twin substructure and the carbon-rich residual austenite (RA) films were revealed. Two nano carbides, MC (rich in V and Mo) as well as M₂₃C₆ (rich in Cr and Mn), with diameters of 10–40 nm, were precipitated due to the intrinsic heat treatment (IHT) in LPBF process. Cr₂₃C₆ particles preferentially nucleated at the grain and subgrain boundaries due to the presence of crystalline defects such as dislocations and stacking faults caused by lattice distortion. It then grew by alloying elemental depletion while remaining semi-coherency with the α-Fe matrix. VC particles nucleated in situ within M₂₃C₆ as V atoms accumulated and replaced M atoms in the M₂₃C₆ lattice. With the growth of VC nuclei, the strain energy caused by local lattice misfit increased. This was offset by the development of self-accommodating twins featuring a long-period stacking order substructure within the VC particles. Eventually, spheroidal VC with twin structure were embedded in or adjacent to M₂₃C₆ carbides, and the orientation relationships for VC/M₂₃C₆ and VC/α-Fe were revealed. The as-built H13 steel exhibited excellent hardness and strength compared to wrought H13 steel, which was mainly attributed to dislocation strengthening and grain boundary strengthening, with precipitation strengthening playing a secondary role due to the low amount of nanoprecipitates. The low elongation (El) at fracture was closely related to the instability of RA films as well as the residual stress.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"919 ","pages":"Article 147504"},"PeriodicalIF":6.1,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic deformation behaviors and structure evolution of TiZrHf hexagonal closed-packed medium-entropy alloy","authors":"Zhenhua Han ,&nbsp;Yubo Tian ,&nbsp;Jun Yang ,&nbsp;Yanchang Liu ,&nbsp;Gang Liu ,&nbsp;Zilu Wang ,&nbsp;Ran Wei ,&nbsp;Guojun Zhang ,&nbsp;Hongyan Wang","doi":"10.1016/j.msea.2024.147516","DOIUrl":"10.1016/j.msea.2024.147516","url":null,"abstract":"<div><div>In this study, the deformation behavior of a hexagonal closed-packed (HCP) TiZrHf medium-entropy alloy (MEA) was investigated across a wide range of strain rates from 10⁻⁴ s⁻¹ to 4990 s⁻¹. The alloy exhibits an exceptional combination of strength and plasticity during dynamic loading, as well as a noticeable strain rate hardening effect. The strain rate hardening effect is associated with the strong dislocation drag resulting from the fast dislocation velocity at high strain rates. Microstructure evolution analyses demonstrate that various deformation mechanisms occur within shear bands under dynamic loading, including the formation of deformation twins, dislocation cells, microbands, amorphous bands, and dynamic recrystallization. The dynamic deformation is influenced by the competition between hardening mechanisms and thermal softening effects. Dislocations, deformation twins, and amorphous bands dominate the strain hardening effect, while temperature rise induced by adiabatic shear contributes to thermal softening effects. Additionally, dynamic recrystallization and amorphization also lead to a decrease in dislocation density during dynamic loading.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"919 ","pages":"Article 147516"},"PeriodicalIF":6.1,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing tensile and creep properties of Inconel 617 superalloy via regulating the synergistic evolution of M23C6 carbides and γ′ phases","authors":"Zhiyang Zhang,&nbsp;Ran Ding,&nbsp;Qianying Guo,&nbsp;Chenxi Liu,&nbsp;Yongchang Liu","doi":"10.1016/j.msea.2024.147523","DOIUrl":"10.1016/j.msea.2024.147523","url":null,"abstract":"<div><div>A novel heat treatment strategy, termed solution-double aging treatment (SDAT), is proposed to enhance the tensile properties and creep resistance at high-temperature of Inconel 617 Ni-based superalloy. This method aims to achieve a microstructure that maintains excellent thermal stability at elevated temperature up to 760 °C. The results suggest that the improved tensile properties of SDAT-treated alloys are attributable to orderly precipitation and synergistic interaction of M₂₃C₆ carbides and γ′ phases. Under identical creep conditions, SDAT alloys significantly enhance creep strength and extend creep rupture life in comparison to solution-treated (ST) alloys. Specifically, under creep conditions of 760 °C/170 MPa, SDAT alloys exhibit a 37.25 % longer creep rupture life than ST alloys, particularly under low-stress conditions. The enhanced creep properties of SDAT alloys are due to the unique microstructure produced by the SDAT treatment: the high-density and small-size of γ′ phases effectively impede dislocation movement, thereby reducing the minimum creep rate; the evolution of cylindrical coarse M₂₃C₆ carbides predominantly occurs near grain boundaries or within grains, reducing the formation of creep cracks; the high proportion of grain boundary M₂₃C₆ carbides mitigates creep damage caused by carbide evolution, inhibiting the initiation and extension of grain boundary cracks. The SDAT heat treatment process provides a novel approach to improving the creep life of Ni-based superalloys by controlling the synergistic evolution mechanisms of carbides and γ′ phases.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"919 ","pages":"Article 147523"},"PeriodicalIF":6.1,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the dynamic failure mechanism of Vit-1 bulk metallic glass: Coupling effects of pre-made damage and strain rate","authors":"Yang Han ,&nbsp;Zejian Xu ,&nbsp;P.J. Tan ,&nbsp;Mengyu Su ,&nbsp;Jianfei Li ,&nbsp;Fenglei Huang","doi":"10.1016/j.msea.2024.147522","DOIUrl":"10.1016/j.msea.2024.147522","url":null,"abstract":"<div><div>To clarify the two distinct effects and the underlying physical mechanisms of pre-made damage on the failure strength of bulk metallic glass (BMG), i.e. strengthening or weakening, the influence of axial pre-compression on the dynamic failure of Vit-1 BMG are investigated experimentally. Quasi-static and dynamic compression tests were conducted on pre-compressed BMG specimens for a wide range of nominal strain rates between 0.001 s⁻¹ to 6000 s⁻¹. The focus is on the coupled effects of pre-compression and strain rate on the dynamic failure stress. Two contrasting mechanisms were identified that influence how the pre-made shear bands affect the propagation of cracks under different strain rates. It will be shown that the dynamic failure stress exhibits a transition from strengthening to knockdown with increasing strain rate; and, that the extent of these strengthening and knockdown effects depends on the pre-compression strain level. Finally, a failure model that captures the effects of both strain rate and pre-made damage is proposed.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"919 ","pages":"Article 147522"},"PeriodicalIF":6.1,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comprehensive overview of additive manufacturing aluminum alloys: Classifications, structures, properties and defects elimination","authors":"Xianwen Yang ,&nbsp;Ruidi Li ,&nbsp;Tiechui Yuan ,&nbsp;Linda Ke ,&nbsp;Jie Bai ,&nbsp;Kai Yang","doi":"10.1016/j.msea.2024.147464","DOIUrl":"10.1016/j.msea.2024.147464","url":null,"abstract":"<div><div>Aluminum alloys, known for their high strength, good toughness, and lightweight properties, are widely used in aerospace, rail transportation, and other fields. 3D printing, as an emerging additive manufacturing (AM) technology, achieves the transformation from digital models to physical products through layer-by-layer material deposition. This processing method significantly enhances the flexibility of both design and manufacturing, while also enabling the efficient production of complex piping and intricate cavity structures. This paper comprehensively and systematically introduces the classification, structure, performance, defects, and elimination methods of AM aluminum alloys. It begins with an introduction to AM technologies and traditional aluminum alloys. Then, it discusses the classifications and performances of AM aluminum alloys, such as Al-Si, Al-Mg-(Sc, Zr), Al-Cu-(Mg), Al-Zn-Mg-(Cu), Al-Fe, Al-Ni, Al-Mn, and Al-based composites, and providing a detailed and comprehensive overview of the mechanical properties (both in horizontal and vertical directions), heat resistance, fatigue performance, creep behavior, corrosion resistance, impact resistance, and wear resistance of the alloys. It also discusses the potential defects of different types of alloys and their mitigation methods, especially the formation mechanisms and elimination methods of porosity, deformation, and cracking. Moreover, the role of refiners in 3D-printed aluminum alloys is separately demonstrated. Finally, the paper presents the practical applications and prospects of 3D printed aluminum alloys, aiming to establish a systematic and comprehensive framework to provide a multi-faceted overview of aluminum alloys in AM, offering valuable insights and guidance for scientific research and industrial applications.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"919 ","pages":"Article 147464"},"PeriodicalIF":6.1,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Achieving high strength and low yield ratio by constructing the network martensite-ferrite heterogeneous in low carbon steels","authors":"Xiong Du ,&nbsp;Liexing Zhou ,&nbsp;Jun Li ,&nbsp;Zhenwei Xie ,&nbsp;Shaohong Li ,&nbsp;Hongbo Xiao ,&nbsp;Mengnie Li ,&nbsp;Yuanjie Zhao","doi":"10.1016/j.msea.2024.147526","DOIUrl":"10.1016/j.msea.2024.147526","url":null,"abstract":"<div><div>In this research, focusing on low-carbon steel, a martensite-ferrite heterogeneous structure dual-phase (MFDP) steel with a network morphology where ferrite is surrounded by martensite was obtained via cyclic annealing and subcritical quenching heat treatment processes. With the initial microstructure of ferrite and lamellar pearlite, a spherical pearlite and martensitic structure surrounding the ferrite was first obtained by applying the cyclic annealing process near the Ac₁ temperature. Subsequently, the annealed structure was subjected to subcritical quenching heat treatment, thereby establishing a network-like martensite-ferrite dual-phase heterogeneous structure and named N-760 °C and N-780 °C. In comparison with the ferrite-martensite dual-phase steel where ferrite envelopes martensite, N-780 °C witnessed a marked increase in tensile strength and uniform elongation, while the yield ratio dropped by 20 %. Through cyclic loading and unloading tensile tests, it was found that the N-760 °C showed a more obvious heterogeneous deformation-induced (HDI) strengthening effect. The results from electron backscattering and transmission electron microscopy indicate that, in the N-760 °C, a small quantity of dislocations is produced in the ferrite due to the martensitic phase transformation prior to the tensile test. During the tensile process, as the strain increases, the ferrite undergoes significant deformation, and the intragranular dislocations re-arrange to form dislocation cells and deformation-induced grain boundaries (SIBs). Meanwhile, geometrically necessary dislocations (GNDs) accumulate at the ferrite/martensite interface. Therefore, the non-coordinated deformation between the mesh-like dual-phase microstructure offers additional HDI strengthening for MFDP steel.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"920 ","pages":"Article 147526"},"PeriodicalIF":6.1,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}