Materials Characterization最新文献

{"title":"Effect of TiB2 particles on the microstructure and mechanical properties of Al-Si-Cu-Mg-Ni alloy fabricated by powder metallurgy","authors":"Yanzhi Peng ,&nbsp;Jian Wang ,&nbsp;Zunyan Xu ,&nbsp;Li Fu ,&nbsp;Liyuan Liu ,&nbsp;Qiong Lu ,&nbsp;Jingmei Tao ,&nbsp;Rui Bao ,&nbsp;Jianhong Yi ,&nbsp;Caiju Li","doi":"10.1016/j.matchar.2025.114979","DOIUrl":"10.1016/j.matchar.2025.114979","url":null,"abstract":"<div><div>The mechanical properties of Al-11Si-3Cu-2Ni-1 Mg alloy (M142 alloy) are significantly affected by grain size, Si phase and intermetallic phase size and distribution. Therefore, the regulation of microstructure is very important to improve the mechanical properties of the alloy. In this work, high performance TiB₂/M142 composites were prepared by powder metallurgy and hot extrusion. The results show that TiB₂ particles can effectively refine the grain and the second phase, and induce more intragranular intermetallic phases. With the increase of TiB₂ content, the strength increased continuously, but the ductility increased first and then decreased. The improvement of the strength of the composites are mainly attributed to thermal mismatch strengthening. The first increase in ductility is mainly due to the capture and pin of the dislocation by intragranular intermetallic phases, which makes the grains have stronger dislocation accumulation and storage capacity. The subsequent reduction in ductility is mainly attributed to the local stress concentration in the TiB₂ agglomeration region, which eventually leads to the rapid failure of the composites.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114979"},"PeriodicalIF":4.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715619","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":"Microstructure evolution and hydrogen embrittlement mechanism of a 2200 MPa press-hardened steel with tempering treatment","authors":"Wei Jian Chen ,&nbsp;Zi Yao Wei ,&nbsp;Shun Hu Zhang ,&nbsp;Ming Kun Ge ,&nbsp;Xin Dai ,&nbsp;Shun Wu","doi":"10.1016/j.matchar.2025.114955","DOIUrl":"10.1016/j.matchar.2025.114955","url":null,"abstract":"<div><div>This study elucidates the coupled enhancement of yield strength and hydrogen embrittlement (HE) resistance in a 2200 MPa press-hardened steel (PHS) through tempering treatments. The results indicate that as the tempering temperature rises, the dislocation density decreases, and the type of precipitated particles changes from needle-like ε-carbides to rod-like η-carbides. Quantitative strengthening mechanism analysis demonstrates that although dislocation strengthening diminishes by 176 MPa after 300 °C tempering, the overall yield strength increases by 186 MPa (reaching 1624 MPa) due to enhanced precipitation strengthening through the interaction between the ε/η-carbides and dislocations. Furthermore, the HE sensitivity of ultra-high strength PHS is governed by the diffusible hydrogen trapped in the dislocations and grain boundaries. Notably, the precipitated particles (semi-coherent (V, Nb)C and ε/η-carbides) effectively suppress both hydrogen-enhanced decohesion (HEDE) and hydrogen-enhanced localized plasticity (HELP) mechanisms by hindering the movement of dislocation‑hydrogen atmospheres. This synergistic effect achieves remarkable HE resistance (fracture strength loss of 1.3 % and displacement loss of 13.2 %) while maintaining ultrahigh strength.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114955"},"PeriodicalIF":4.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715623","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":"The role of copper in transforming CuxCoCrNiAl high-entropy alloys for enhanced strength and ductility","authors":"Fa-Chang Zhao ,&nbsp;Guo-Ning Ji ,&nbsp;Xing-Ming Zhao,&nbsp;Rong-Da Zhao,&nbsp;Fu-Fa Wu","doi":"10.1016/j.matchar.2025.114973","DOIUrl":"10.1016/j.matchar.2025.114973","url":null,"abstract":"<div><div>This study conducted a detailed analysis of the microstructure evolution and mechanical properties of a series of Cu_<em>x</em>CoCrNiAl high-entropy alloys (HEAs) to assess the influence of Cu content on HEAs. The findings indicated that with increasing Cu content, the alloy's phase structure changed from FCC1 + FCC2 (AlCu) + BCC to FCC phase. As the Cu content rose from 20 % to 80 %, the hardness of the alloy decreased progressively from 515 HV to 135 HV, and the ultimate tensile strength reduced from 1335 MPa to 524 MPa. The fracture mechanism shifted from a mixed brittle-ductile fracture to a ductile fracture. Consequently, the Cu₄CoCrNiAl HEA (CA50) demonstrated superior overall mechanical properties, with hardness, yield strength, ultimate tensile strength, and elongation measured at 321 HV, 556 MPa, 846 MPa, and 16.4 %, respectively. This research is significant for the advancement of engineering and structural materials with outstanding mechanical properties.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114973"},"PeriodicalIF":4.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715755","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":"Effect of overlap percentage on morphology, microstructure, and mechanical properties during multilayer multi-pass friction rolling additive manufacturing","authors":"Haibin Liu ,&nbsp;Yangyang Xu ,&nbsp;Run Hou ,&nbsp;Chenghao Wu ,&nbsp;Chunyang Yang ,&nbsp;Ruishan Xie ,&nbsp;Shujun Chen","doi":"10.1016/j.matchar.2025.114980","DOIUrl":"10.1016/j.matchar.2025.114980","url":null,"abstract":"<div><div>Solid-state metal additive manufacturing technology leads to efficient and rapid production of large, complex metal components. Friction Rolling Additive Manufacturing (FRAM) has successfully overcome the limitations of the width of formed parts and facilitates the manufacture high-performance large metal components. However, research on deposition strategies for thick-section-formed parts is yet to be conducted. This study reports the successful fabrication of multilayer multi-pass samples with different overlap percentages (OPs) (0 %, 12.5 %, 25 %, 37.5 %, 50 %, 62.5 %, and 75 %) and the effects of OP on sample morphology, microstructure, and mechanical properties. The results indicate that with gradually increasing OP, the effective deposition width narrows, mixing degree of plasticized material in overlap zone (OZ) improves, and forming morphology of samples progressively deteriorates. The height of OZ increases from 0.7 mm to 2.4 mm, with a maximum height difference of approximately 0.85 mm between the OZs and non-OZs. The height and slope of the grooves at the edges of the OZ gradually decrease. Simultaneously, the as-deposited (AD) 25 % OZ was observed to have small and uniform grains with sizes of about 5.82–7.44 μm. The grain size and LAGBs of the post-deposited heat-treated (PDHT) OZ center increased to 8.4 μm and 52 %, respectively. The mechanical properties of the AD and the PDHT of the 25 % overlap sample were optimal. The maximum tensile strength and elongation of the PDHT-25 % overlap sample in the Y- and <em>Z</em>-direction were 265 MPa, 15.8 %, and 242.3 MPa, 14.8 %, respectively. Thus, 25 % OP (OZ width of 3 mm) effectively balances the morphology, efficiency, and performance of the sample, providing an optimal multilayer, multi-pass deposition strategy for the future deposition of thick sections of large, complex metal components using FRAM.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114980"},"PeriodicalIF":4.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725331","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":"Effect of pre-aging on the microstructure and properties evolution of cold-rolled Cu-Ni-Co-Si during final aging","authors":"Yang Song ,&nbsp;Yuefeng Jiang ,&nbsp;Dongyang Zhao ,&nbsp;Yuheng Fan ,&nbsp;Hongliang Zhao ,&nbsp;Chunwen Guo ,&nbsp;Shuya Zhang ,&nbsp;Xianglei Dong ,&nbsp;Qiao Yin","doi":"10.1016/j.matchar.2025.114957","DOIUrl":"10.1016/j.matchar.2025.114957","url":null,"abstract":"<div><div>Thermomechanical treatment plays a crucial role in microstructure regulation and properties optimization of precipitation-hardening Cu alloys. In this study, the influence of pre-aging on the microstructure and properties evolution of cold-rolled Cu-1.2Ni-0.9Co-0.5Si alloy during final aging has been systematically investigated. The results demonstrated that pre-aging induced an increase in dislocation density and facilitated the precipitation of fine precipitates, thereby resulting in a simultaneous enhancement of both strength and electrical conductivity. The Cu-1.2Ni-0.9Co-0.5Si alloy treated by pre-aging at 500 °C for 1 h exhibits a tensile strength of 791.5 MPa and an electrical conductivity of 45.3 % IACS, which are both superior to the counterparts of the alloys without pre-aging treatment (755.5 MPa and 42.2 % IACS). However, as aging proceeded, the pre-aging treated alloy exhibited an accelerated decline in dislocation density due to enhanced recrystallization and a more pronounced tendency for precipitation growth compared to the untreated alloy. Consequently, the pre-aging treated alloy showed a more conspicuous softening phenomenon and resultant lower strength level during over-aging period than the untreated one.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114957"},"PeriodicalIF":4.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715620","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":"Wavelength-resolved neutron transmission analyses of textured materials","authors":"F. Malamud ,&nbsp;M.A. Vicente Alvarez ,&nbsp;J.R. Santisteban ,&nbsp;M. Strobl","doi":"10.1016/j.matchar.2025.114969","DOIUrl":"10.1016/j.matchar.2025.114969","url":null,"abstract":"<div><div>Wavelength-resolved neutron imaging for diffraction contrast often referred to as Bragg edge imaging is a neutron-based technique that has gained attention in recent years due to its promising ability to characterize the microstructure of polycrystalline materials with spatial resolution. This method relies on spatially resolved analyses of diffraction induced features in transmission spectra within the thermal neutron range. Assessable characteristics are e.g. phase fractions, lattice strains, and crystallographic texture. For the latter forward modelling of transmission spectra from known orientation distribution functions (ODFs) has been demonstrated for various materials. However, solving the inverse problem—retrieving crystallographic texture from transmission spectra—presents a more complex challenge. In recent years, the authors have developed two theoretical approaches to model the relationship between transmission spectra and texture, either by decomposing the ODF into individual orientation fractions or by expanding it into a Fourier series. Both approaches have shown excellent predictive capability for materials with different crystal symmetries, including hexagonal, FCC, and BCC structures. Here we present the comparison between the proposed models, highlighting the advantages and disadvantages of the direct method based on different approaches for the analysis of wavelength-resolved neutron transmission experiments of textured materials. Finally, we present the future trends in the inversion method, i.e., the estimation of the ODFs from transmission spectra in tomography experiments.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114969"},"PeriodicalIF":4.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715752","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 corrosion resistance improved by the coarsening precipitations containing Zn in the Al-4.0Cu-1.0Li-Mg alloy","authors":"Xin Liu ,&nbsp;Wei Zhou ,&nbsp;Nian Liu ,&nbsp;Zhen-zhen Liu ,&nbsp;Guang-jun Zeng ,&nbsp;Jian-mei Li ,&nbsp;Chao Cai ,&nbsp;Dan-yang Liu ,&nbsp;Jin-feng Li","doi":"10.1016/j.matchar.2025.114966","DOIUrl":"10.1016/j.matchar.2025.114966","url":null,"abstract":"<div><div>The relationship between the microstructure characteristic evolution, electrochemical behavior and corrosion behaviors of the aging Al-4.0Cu-1.0Li-Mg alloy with and without the addition of Zn was investigated. A comprehensive evaluation of the correlation between microstructure and corrosion properties was conducted through a series of tests, including hardness tests, immersion tests, electrochemical tests, and microstructure characterization. The results demonstrated that the aggregation of Zn elements in the coarse T₁ phases at the grain boundaries (GBs) was greater than that within the grains. The addition of Zn element to the aging Al-4.0Cu-1.0Li-Mg alloy was not affecting the phase type evolution and precipitation sequence of the aging phase. As the aging time was extended, the number of T₁ phases in the grain increased, the number of θ′ phases decreased, the width of the precipitate-free zone (PFZ) narrowed, and the T₁ phase at the GBs underwent a transformation from continuous to intermittent to continuous. The corrosion depth reduction of intergranular corrosion (IGC) during under-aging (UA) stage and diminished the corrosion susceptibility of exfoliation corrosion (EXCO) under peak-aging (PA) and over-aging (OA) stages in the alloy with Zn addition were attributed to the promotion of the addition of Zn element on the T₁ phase coarsening and the reduction in potential difference between the Zn-containing coarsening phase at GBs or within the grain and the alloy matrix.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114966"},"PeriodicalIF":4.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715751","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":"Superior combination of strength and ductility in gradient-structured Cu-Ge alloy","authors":"Yulan Gong ,&nbsp;Baozhuang Cai ,&nbsp;Lele Sun ,&nbsp;Xingfu Li ,&nbsp;Mengxiang Zhang ,&nbsp;Jingran Yang ,&nbsp;Cong Li ,&nbsp;Zhilin Wu ,&nbsp;Jin Wang ,&nbsp;Delong Zhang ,&nbsp;Bo Gao ,&nbsp;Tabasum Huma ,&nbsp;Xinkun Zhu","doi":"10.1016/j.matchar.2025.114959","DOIUrl":"10.1016/j.matchar.2025.114959","url":null,"abstract":"<div><div>The microstructures and mechanical properties of gradient Cu-9.0 at.%Ge alloy produced by surface mechanical attrition treatment (SMAT) with different durations at the liquid nitrogen temperature have been investigated. In the process of SMAT, the gradient distribution of defects, including dislocations, twins, and stacking faults was formed. The SMATed alloy showed more than twice the yield strength, while the uniform elongation remained as much as ∼0.65, comparable to that in the untreated samples, suggesting excellent strength-ductility synergy. Multiple strengthening mechanisms promoted strengthening and hardening, including dislocation pile-up, deformation twinning, and stacking faults. The accommodation deformation between the surface hard and central soft layers induced strain delocalization. The strength-ductility synergy of the alloy is attributed to the high strain hardening rate caused by hetero-deformation-induced (HDI) hardening, strain delocalization, and synergistic strengthening. The study provides new insights and guidelines for the future design of gradient materials.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114959"},"PeriodicalIF":4.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734865","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":"The effect of pre-weld microstructures and mechanical properties of 6061 aluminum alloy on the welding quality of FSLW joints between 6061 aluminum alloy and 316 stainless steel","authors":"Sheng Liu ,&nbsp;Jingqiao Qin ,&nbsp;Yongjun Ren ,&nbsp;Xinbin Hu ,&nbsp;Wei Long","doi":"10.1016/j.matchar.2025.114968","DOIUrl":"10.1016/j.matchar.2025.114968","url":null,"abstract":"<div><div>The effect of pre-weld microstructures and properties of 6061 aluminum alloy on the welding quality of FSLW joints between 6061 aluminum alloy and 316 L stainless steel plates was carried out. The results show that the variations of composition, microstructure and property of pre-welded 6061 plates have a significant impact on the microstructures and properties of 6061/316 L FSLW joints when the welding process parameters are fixed. The high-strength 6061 is prone to introducing defects during the welding process. The strength, plasticity and hardness of the 6061 comprehensively affect the metal fluidity during welding and the ability to achieve better metallurgical/mechanical bonding of 6061 and 316 L. By adjusting the microstructure and properties of 6061 before welding, the metal fluidity of the nugget zone of 6061/316 L can be improved, and the defects can be reduced, thus indirectly improving the properties of the joints. A low proportion of low-angle grain boundaries, low-strength and hardness, high-plasticity and Si-rich phase-free solid-solution 6061 are perfectly suitable for welding with 316 L when the 6061 solution treatment is 500 °C/4 h with water quenching, welding speed is 100 mm/min, the plunge depth is 2.8 mm, and the rotation speed is 800 rpm, respectively. The shear strength of the joint can reach to 8817 N, representing a maximum increase of 173.82 % compared to that of the joint without pre-weld heat treatment. A novel method of using strength and plasticity ratio is proposed to precisely select suitable 6061 plate for high quality 6061/316 L FSLW joints under the given welding conditions.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114968"},"PeriodicalIF":4.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143746633","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":"Excellent strength-toughness balance of low-carbon low-alloy steel manufactured by a three-stage rolling coupling inter-pass reheating process","authors":"Wei Liu ,&nbsp;Yinan Zhang ,&nbsp;Xiaoning Xu ,&nbsp;Bin Wang ,&nbsp;Bingxing Wang ,&nbsp;Yong Tian","doi":"10.1016/j.matchar.2025.114972","DOIUrl":"10.1016/j.matchar.2025.114972","url":null,"abstract":"<div><div>In this study, a low-carbon low-alloy (LCLA) steel with ferrite and bainite mixed structure was successfully prepared by a novel three-stage rolling coupling inter-pass reheating process (TPS). The plate was compared to a plate prepared by conventional thermo-mechanical processing (CPS). The study on microstructure evolution, quasi-static tensile properties, dynamic Charpy impact toughness and fracture behavior of the experimental steels were deeply investigated. The results manifests that the TPS technology effectively refine the grain size of austenite grain and optimizes the distribution of the driving force behind phase transitions, thereby facilitating the development of a ferrite-bainite mixed microstructure (83.4 ± 6 % GB + 15.2 ± 3 % PF) in TPS steel. In contrast to CPS steel, the newly developed TPS steel significantly enhances low-temperature impact toughness while maintaining high strength, namely, a yield strength of 532 ± 7 MPa, a total elongation of 21.3 %, and the Charpy impact energy of 137 J at −60 °C. The refined grains and synergistic deformation of mixed microstructure can contribute to the excellent ductility without compromising strength in TPS steel. The excellent impact toughness of TPS steel is induced by multi-factor coupling. Finer initial effective grain size, higher proportion of high angle grain boundarie, higher intensity of the desired texture {332} 〈113〉, and significant hetero-deformation induced stress are all factors affecting toughness. Additionally, benefitted to the “weak interface” between ferrite and bainite, the delamination toughening is fully activated (extrinsic toughening), which significantly improves the overall fracture resistance. Based on the performance optimization results, the feasibility of preparing the LCLA steel with excellent combination of strength, ductility and toughness using three-stage rolling coupling inter-pass reheating process was verified. This innovative approach offers a pathway for the development of superior steel suitable for engineering applications.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114972"},"PeriodicalIF":4.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715749","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}