Journal of Magnesium and Alloys最新文献

{"title":"Robust interfacial bonding achieved via phase separation induced by enhanced Al diffusion during AZ31/high-entropy alloy friction stir welding","authors":"Gaohui Li ,&nbsp;Haining Yao ,&nbsp;Boyuan Fu ,&nbsp;Ke Chen ,&nbsp;Katsuyoshi Kondoh ,&nbsp;Nannan Chen ,&nbsp;Min Wang","doi":"10.1016/j.jma.2024.09.010","DOIUrl":"10.1016/j.jma.2024.09.010","url":null,"abstract":"<div><div>Welding high-entropy alloy (HEA) to Mg alloy has gained increasing attention for multi-metal structure design, while intrinsic sluggish diffusion kinetics of HEA confines diffusion-controlled interfacial reactions and makes it challenging to establish robust metallurgical bonding. This study investigated welding of FeCoCrNiMn HEA to commercial AZ31 as a model combination to pioneer this field. Interfacial phase separation phenomenon was observed, with the diffusion accelerated by <em>in-situ</em> engineering a submicron-scale thick (∼400–500 nm) HEA nearby the interface into nanocrystalline-structure during friction stir welding. Abundant grain boundaries generated in this nanocrystalline-interlayer serve as diffusion short-circuits and energetically preferred nucleation-sites, which promoted Al in AZ31 to diffuse into HEA and triggered quick separation into body-centered cubic AlNi-type and tetragonal FeCr-type intermetallics. HEA and AZ31 were thus metallurgically bonded by these interfacial intermetallics. The joint shows exceptional strength in tensile lap-shear testing with fracture largely occurred within AZ31 rather than right along interface as commonly reported previously for dissimilar joints.</div></div>","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"13 3","pages":"Pages 1012-1019"},"PeriodicalIF":15.8,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142519459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Wetting behavior of Mo, Ta, and stainless steel substrates in contact with molten Mg","authors":"S. Terlicka ,&nbsp;N. Sobczak ,&nbsp;K. Janus ,&nbsp;J.J. Sobczak","doi":"10.1016/j.jma.2025.02.012","DOIUrl":"10.1016/j.jma.2025.02.012","url":null,"abstract":"<div><div>The sessile drop method combined with a capillary purification procedure was used, for the first time, to analyze the high-temperature behavior of molten Mg on three dissimilar substrates: 1) molybdenum, 2) tantalum and 3) AISI 316L stainless steel. All tests were performed under isothermal conditions at 720 °C in a protective atmosphere (Ar + 5 wt.% H₂). Images of Mg/substrate couples recorded during the experiments were used to calculate the contact angles (θ) formed between the liquid Mg drop and the selected substrates.</div><div>After the sessile drop tests, the Mg/Mo, Mg/Ta, and Mg/AISI 316L couples were subjected to in-depth microstructural characterization using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS).</div><div>Under the employed experimental conditions, oxide-free Mg drops on all tested couples presented non-wetting behavior (θ &gt; 90°). The average values of the calculated contact angles after 40 s of liquid Mg deposition were θ_Mg/Mo = 124°, θ_Mg/Ta= 125°, and θ_{Mg/AISI 316L}= 126°, respectively. The SEM/EDS analysis showed no mass transfer and no bonding between solidified drops and the substrates. This non-reactive and non-wetting behavior of investigated couples can be associated with the immiscible nature of the Mg-Mo, Mg-Ta, and Mg-Fe systems, where the solubility of liquid Mg with all tested materials is negligible, and Mg does not form any compounds with them.</div></div>","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"13 3","pages":"Pages 1149-1159"},"PeriodicalIF":15.8,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143538451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Exploring microstructure and texture evolution in AZX311 Mg alloy under cyclic shear deformation","authors":"Mahesh Panchal ,&nbsp;Lalit Kaushik ,&nbsp;Ravi Kottan Renganayagalu ,&nbsp;Shi-Hoon Choi ,&nbsp;Jaiveer Singh","doi":"10.1016/j.jma.2025.02.009","DOIUrl":"10.1016/j.jma.2025.02.009","url":null,"abstract":"<div><div>The current study focuses on investigating the effect of in-plane cyclic shear (IPCS) on the microstructure and texture evolution in an AZX311 Mg alloy sheet using a customized in-plane shear jig. Samples were deformed at two distinct strain levels of 0.05 and 0.10, with tests conducted over different numbers of deformation cycles at each strain level. A detailed microstructural investigation using electron backscatter diffraction (EBSD) revealed that in-plane cyclic shear induced the formation of numerous tensile twins (TTWs) in the alloy sheet. Both the shear strain and the number of deformation cycles contributed to an increase in the twin volume fraction (TVF), which played a critical role in texture evolution. Notably, unlike in-plane shear (IPS) deformation, where two satellite peaks appear in opposite quadrants, in-plane cyclic shear resulted in satellite peaks across all four quadrants of the pole figure. The evolution of texture components across all four quadrants arises from the load variations under forward and reverse loading during cyclic deformation. Thus, in-plane cyclic shear deformation can generate texture components along nearly all directions in the pole figures. Additionally, microstructural and microtextural analyses revealed that TTW is the dominant deformation mechanism, contributing to texture evolution. Furthermore, the resolved shear stress (RSS) analysis indicated that prismatic slip activity predominantly governs dislocation slip behavior.</div></div>","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"13 3","pages":"Pages 1258-1274"},"PeriodicalIF":15.8,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143518091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Advances in LDHs for corrosion-resistant protection of Mg and Al alloys: A review","authors":"Lin Wang ,&nbsp;Fen Zhang ,&nbsp;Zuo-Jun Jiao ,&nbsp;Lan-Yue Cui ,&nbsp;Yuan-Ding Huang ,&nbsp;Shuo-Qi Li ,&nbsp;Cheng-Bao Liu ,&nbsp;Rong-Chang Zeng","doi":"10.1016/j.jma.2025.01.021","DOIUrl":"10.1016/j.jma.2025.01.021","url":null,"abstract":"<div><div>Layered double hydroxides (LDHs) as coatings attract much attention in corrosion and protection of light metals due to their interesting properties such as in-situ synthesis, unique layer-stacking structure, tunable composition, and good biocompatibility as well. Currently, single LDH coating faces challenges such as time-consumed synthesis, thin coating thickness and inadequate density. This paper provides a systematic review of the cutting-edge advancements in modulation of composition, synthesis and applications of LDHs on Mg and Al alloys in corrosion protection and biomedical fields. The focus is concentrated on the intercalation of corrosion inhibitors into LDH coatings. Particularly the anti-corrosion mechanisms of both inorganic anions (nitrate, vanadate, and molybdate) and organic anion intercalation (carboxylic acid anions and hydroxyquinolines) were discussed within the context of corrosion inhibitor intercalation LDH. The modification of LDHs is introduced with low surface energy substances such as silanes and fatty acids. The formation mechanism of LDH films and the active anti-corrosion mechanisms were proposed. A comparison of LDH coatings between Mg alloy and Al alloy was carried out from different perspectives, and further researches on LDH corrosion protection were prospected.</div></div>","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"13 3","pages":"Pages 923-947"},"PeriodicalIF":15.8,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143653580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Mechanisms of grain refinement and improved kinetic property of nanocrystalline Mg-Ni-La hydrogen storage alloys prepared by nanocrystallization of amorphous","authors":"Y.M. Li ,&nbsp;Z.C. Liu ,&nbsp;X. Dong ,&nbsp;Y.P. Ji ,&nbsp;C.J. Shi ,&nbsp;G.F. Zhang ,&nbsp;Y.Z. Li ,&nbsp;J. Kennedy ,&nbsp;F. Yang","doi":"10.1016/j.jma.2024.07.022","DOIUrl":"10.1016/j.jma.2024.07.022","url":null,"abstract":"<div><div>Mg_x(Ni_0.8La_0.2)_100-x, where x = 60, 70, 80, exhibiting a nanocrystalline microstructure, were prepared through the crystallization of amorphous alloys. The investigation encompassed the phase constitution, grain size, microstructural stability, and hydrogen storage properties. Crystallization kinetics, along with in-situ high-energy XRD characterization, revealed a concentrated and synchronous crystallization of Mg₂Ni and RE-Mg-Ni ternary phases with the increase in La and Ni content. The attributed synchronous crystallization process was found to be a result of the close local affinity of Mg₂Ni and RE-Mg-Ni ternary phases, as assessed by the thermodynamic Miedema model. Significant secondary phase pinning effect, arising from the high likelihood of well-matching phase structures between Mg₂Ni, LaMg₂Ni, and LaMgNi₄, was validated through both the edge-to-edge matching model prediction and experimental observation. The fine and homogeneous microstructure was shown to be a consequence of fast crystallization kinetics and the secondary phase pinning effect. Improved activation performance and cycling stability were observed, stemming from grain refinement and excellent microstructural stability. Our study provides insights into mechanism of grain refinement of nanocrystalline microstructure tailored by phase constitution and crystallization kinetics in the amorphous-crystallization route. We also demonstrate the potential of material design guided by phase equilibria and crystallographic predictions to improve nanocrystalline with excellent microstructural stability.</div></div>","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"13 3","pages":"Pages 1364-1381"},"PeriodicalIF":15.8,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143767932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Study on the condensation behavior of magnesium vapor by flow field disturbance under relative vacuum","authors":"Jing-zhong Xu,&nbsp;Ting-an Zhang,&nbsp;Hong-xuan Liu","doi":"10.1016/j.jma.2024.04.003","DOIUrl":"10.1016/j.jma.2024.04.003","url":null,"abstract":"<div><div>Compared with Pidgeon process, the relative vacuum continuous magnesium smelting process reduces the ratio of material to magnesium by changing raw materials and the direct reduction after calcination of prefabricated pellets, so that the energy consumption per ton of magnesium produced is reduced by 30∼40%, and the carbon emission is reduced by 43∼52%, breaking through the vacuum conditions to achieve continuous production. However, in the process of industrialization, it was found that the magnesium yield in the condenser was low. Therefore, this paper constructs a condenser model of relative vacuum continuous magnesium refining process, and comprehensively analyzes the condensation mechanism of magnesium vapor through simulation and experiment. It is found that the dynamic characteristics of magnesium vapor condensation is an important index to measure its continuity. Under the condition of flowing argon as the protective gas, when the condensation plate spacing is 10 cm, the surface roughness amplitude variance is 2, and the carrier gas flow rate is 20 × 10⁻³ m/s, the magnesium vapor has a better condensation effect, and the condensation efficiency formula is derived.</div></div>","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"13 3","pages":"Pages 1116-1132"},"PeriodicalIF":15.8,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140757105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"A novel carbon-induced-porosity mechanism for improved cycling stability of magnesium hydride","authors":"Shuaijun Ding ,&nbsp;Yuqing Qiao ,&nbsp;Xuecheng Cai ,&nbsp;Hongchao Wang ,&nbsp;Xun Shen ,&nbsp;Lidong Xu ,&nbsp;Yixuan Wen ,&nbsp;Fenglong Jiang ,&nbsp;Wei Zhou ,&nbsp;Tongde Shen","doi":"10.1016/j.jma.2024.04.020","DOIUrl":"10.1016/j.jma.2024.04.020","url":null,"abstract":"<div><div>MgH₂ has been extensively studied as one of the most ideal solid hydrogen storage materials. Nevertheless, rapid capacity decay and sluggish hydrogen storage kinetics hamper its practical application. Herein, a Ni/C nano-catalyst doped MgH₂ (MgH₂<img>Ni/C) shows an improved hydrogen absorption kinetics with largely reduced activation energy. Particularly, the MgH₂<img>Ni/C displays remarkable cycling stability, which maintains a high capacity of 6.01 wt.% (98.8% of initial capacity) even after 50 full hydrogen ab/desorption cycles, while the undoped MgH₂ counterpart retains only 85.2% of its initial capacity. Detailed microstructure characterizations clearly reveal that particle sintering/growth accounts primarily for the deterioration of cycling performance of undoped MgH₂. By comparison, MgH₂<img>Ni/C can maintain a stable particle size with a growing porous structure during long-term cycling, which effectively increases the specific surface of the particles. A novel carbon-induced-porosity stabilization mechanism is proposed, which can stabilize the proportion of rapid hydrogen absorption process, thus dominating the excellent cycling performance of MgH₂<img>Ni/C. This study provides new insights into the cycling stability mechanism of carbon-containing Mg-based hydrogen storage materials, thus promoting their practical applications.</div></div>","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"13 3","pages":"Pages 1341-1352"},"PeriodicalIF":15.8,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141039994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Long-term high-temperature resistant biotemplated composite coating for AZ91D magnesium alloy protection","authors":"Shupei Liu ,&nbsp;Xinfang Zhang ,&nbsp;Chijia Wang ,&nbsp;Changqing Yin ,&nbsp;Jinsong Rao ,&nbsp;Yuxin Zhang ,&nbsp;Dusan Losic","doi":"10.1016/j.jma.2022.10.013","DOIUrl":"10.1016/j.jma.2022.10.013","url":null,"abstract":"<div><div>Integrating different active substances through carriers and fully exerting their synergistic corrosion inhibition ability is an efficient anticorrosion strategy. Biotemplate (diatomite) was used to integrate polyaniline and sodium phosphate, an active antiseptic filler (PANI/DM/SP) was prepared in this work. Moreover, active fillers were combined with epoxy resins to prepare high-efficiency anti-corrosion coatings for magnesium alloy protection. The stability of the corrosion inhibitor (sodium phosphate) released by the active filler was analyzed by establishing a mathematical model. Simultaneously, electrochemical impedance spectroscopy tests demonstrate excellent corrosion inhibition properties of active fillers and the impedance modulus of composite coatings was three orders of magnitude higher than that of the EP coating, due to the synergistic effect of each component of the active filler. In addition, the mechanical properties of the composite coating were significantly improved, with tests showing a 51.31% increase in rub resistance and two grades of adhesion improvement (ASTM standard). The key of this work was to give full play to the slow-release characteristics of diatomite through scientific methods and promote the synergistic anticorrosion effect of sodium phosphate and polyaniline.</div></div>","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"13 3","pages":"Pages 1050-1065"},"PeriodicalIF":15.8,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47474401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Spark plasma sintering of a novel Mg-0.7Ca alloy: A comprehensive study","authors":"Parisa Golmohammadi ,&nbsp;Behzad Nayebi ,&nbsp;Ahmad Bahmani ,&nbsp;Nader Parvin ,&nbsp;Woo Jin Kim","doi":"10.1016/j.jma.2025.02.004","DOIUrl":"10.1016/j.jma.2025.02.004","url":null,"abstract":"<div><div>Light-weight Mg-based alloys have gained attention owing to their various applications in engineering and biomedical fields. Recent advancements in modern powder metallurgy techniques, such as spark plasma technique (SPS), have enabled achieving near-net-shape products with tailored properties and decreased in-process oxidation. However, improving their mechanical and physical properties require further enhancement. In this study, a novel Mg-0.7Ca alloy was produced using SPS process. The effects of process parameters such as sintering time and additive type on the microstructural evolutions, phase arrangements, and mechanical and physical properties of the consolidated materials were investigated through various characterization techniques. Full-dense samples were produced from 60-minute ball-milled powder mixtures through spark plasma sintering at 420 °C for 7, 10, and 13 min under 38 MPa of externally applied pressure. The obtained samples were then characterized using Field Emission Scanning Electron Microscopy (FESEM), Electron Backscatter Diffraction (EBSD), X-ray Energy Dispersive Spectroscopy (EDS), and X-ray Diffraction (XRD) analysis methods, as well as mechanical tests including compression strength and micro-hardness measurements. The results indicated that while improved densification behavior is observed in paraffin-contained samples, relatively better compression properties are achieved in starch-contained alloys. It is also found that the phase arrangement of the starch-contained samples includes higher fractions of the secondary phases such as oxides and residual carbons, which can positively affect the mechanical strength, despite decreased hardness. The microstructural characterizations showed an intensified thermomechanical response of the materials in both groups via increased sintering time. However, the competition between the influencing parameters causes scattered strengthening behavior and texture in the consolidated samples. Detailed discussions about the densification behavior, texture, and obtained characteristics were also included.</div></div>","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"13 3","pages":"Pages 1325-1340"},"PeriodicalIF":15.8,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143569582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Unusual twin induced recrystallization and corresponding texture optimization in a cold rolled Mg-Gd-Zr alloy during annealing","authors":"Ning Lv ,&nbsp;Lingyu Zhao ,&nbsp;Hong Yan ,&nbsp;Boyu Liu ,&nbsp;Rongshi Chen ,&nbsp;Zhiwei Shan","doi":"10.1016/j.jma.2024.04.015","DOIUrl":"10.1016/j.jma.2024.04.015","url":null,"abstract":"<div><div>Twins play an important role in the texture transition during annealing. In a cold rolled high rare earth content magnesium (Mg) alloys with {10–12} extension twins, {11–21} extension twins, {10–11} compression twins and {10–11}-{10–12} double twins and frequent twin-twin interactions, quasi-in-situ electron backscatter diffraction method was used to observe the twin induced static recrystallization (SRX) and related effect on texture during annealing. The results show that basal component was consumed owing to the SRX occurred in basal oriented {10–12} twins and SRXed grains with several specific orientations show preferential grain growth. SRX widely operated in the {10–12} extension and {11–21} extension twins, but absent in most {10–11} compression and {10–11}-{10–12} double twins, which is different to traditional twin induced SRX. Most compression/double twins detwinned while only partial tension twins detwinned. Operation of {11–21} twins and resultant twin-twin interaction facilitate the formation of serrated twin boundaries, which can serve as nucleation sites. Activation of &lt;c + a&gt; dislocation and related dislocation interaction in high dislocation density areas promote the formation of new grain boundaries and related SRX. Profuse &lt;c + a&gt; dislocations in basal oriented twins release the strain accumulation in compression/double twins and thus result in the absence of SRX. The twin size difference, storage energy and dislocation-twin interaction commonly functioned to the detwinning during annealing. The near-coincide site lattice boundaries that show high mobility were considered to be the important contributor to the preferential grain growth of SRXed grains.</div></div>","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"13 3","pages":"Pages 1099-1115"},"PeriodicalIF":15.8,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141051400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}