Materials Science and Engineering: A最新文献

{"title":"Electropulsing-enhanced dissolution of Laves phase and tensile properties in laser additively manufactured 718Plus alloy","authors":"Zhipeng Zhang ,&nbsp;Jide Liu ,&nbsp;Jingdong Guo ,&nbsp;Jinchao Ma ,&nbsp;Xinguang Wang ,&nbsp;Yizhou Zhou ,&nbsp;Jianjun Wang ,&nbsp;Jinguo Li","doi":"10.1016/j.msea.2025.148475","DOIUrl":"10.1016/j.msea.2025.148475","url":null,"abstract":"<div><div>Electropulsing technique was first used for laser additive manufacturing (LAM) of Ni-based superalloy, and the effect of electropulsing treatment (EPT) on the dissolution behavior of Laves phase and tensile properties was investigated. The results show that EPT reduces the thermodynamic potential barrier during the Laves phase dissolution process by altering the free energy of the system, enabling the dissolution of Laves phase at a relatively low temperature (1050 °C). Moreover, the Laves phase preferentially dissolves in the region of small curvature radius under the current detour effect. Based on the Johnson–Mehl–Avrami–Kolmogorov (JMAK) model, the dissolution kinetics of Laves phase under EPT was analyzed. The quantitative relationship of Laves phase dissolution kinetics under EPT and conventional heat treatment (CHT) was established. Theoretical analysis and quantitative calculations reveal that the diffusion coefficient of the EPT at 1050 °C is 10 times higher than under CHT. The decrease in Laves phase volume fraction leads to a significant increase in elongation. The lower treatment temperatures and shorter times effectively suppressed abnormal grain growth, resulting in a significant increase in elongation of the EPT-3 sample to 39.5 %. The failure mechanisms and crack initiation of as-deposited, EPT-3 and CHT-6 samples were systematically analyzed. It can be found that the required microstructure of the alloy can be rapidly achieved at lower temperatures by applying EPT. Compared with CHT, the EPT technology provides a clean, efficient, and limitless potential new post-treatment method for LAM Ni-based superalloys.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"937 ","pages":"Article 148475"},"PeriodicalIF":6.1,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143931348","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 grain refinement and strength enhancement of 2025 aluminum alloy by introducing a novel Al-TCB master alloy","authors":"Zhan Liu ,&nbsp;Jinfeng Nie ,&nbsp;Yuyao Chen ,&nbsp;Kaixuan Zhou ,&nbsp;Ruisheng Zhang ,&nbsp;Yonghao Zhao ,&nbsp;Chong Li ,&nbsp;Xiangfa Liu","doi":"10.1016/j.msea.2025.148467","DOIUrl":"10.1016/j.msea.2025.148467","url":null,"abstract":"<div><div>In this study, the Al-TCB master alloy was incorporated into Zr-containing 2025 Al alloys through casting metallurgy. Subsequent hot extrusion and T6 heat treatment were employed to optimize the microstructure and improve the comprehensive mechanical properties. The results show that the average grain size of Zr-containing 2025 alloy was refined from 423 μm to 96 μm by adding 2 wt% of Al-TCB master alloy. The Al-TCB master alloy has a substantial anti Zr-poisoning effect. The B-doped TiC particles induced by the Al-TCB master alloy remained stable in the Al melt, serving as an effective heterogeneous nucleation substrate. After hot extrusion and T6 treatment, the ultimate tensile strength of the 2025-2 wt% Al-TCB alloy reaches 400.0 MPa and an elongation to failure of 20.0 %. The enhancement in mechanical properties is attributed to the effective grain refinement facilitated by the Al-TCB master alloy, which also suppressed coarse-grain structure formation during the aging process.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"937 ","pages":"Article 148467"},"PeriodicalIF":6.1,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143931350","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":"Study on microstructure, mechanical properties and thermal conductivity of vacuum-assisted high pressure die casting Mg-5Zn-xCu-0.5Zr alloy","authors":"Wenyuan Cong ,&nbsp;Feng Wang ,&nbsp;Xudong Du ,&nbsp;Zhi Wang ,&nbsp;Le Zhou ,&nbsp;Ziqi Wei ,&nbsp;Pingli Mao ,&nbsp;Jinwei Li","doi":"10.1016/j.msea.2025.148478","DOIUrl":"10.1016/j.msea.2025.148478","url":null,"abstract":"<div><div>This study investigates the effects of Cu content and heat treatment on the microstructure, mechanical properties, and thermal conductivity (TC) of vacuum-assisted high pressure die cast (HPDC) Mg-5Zn-xCu-0.5Zr alloys (x = 0, 0.5, 1, and 2 wt%). The results indicate that the addition of Cu leads to the formation of the MgZnCu phase and refines the microstructure of the alloy. The strength and elongation of the alloy increase and then decrease with increasing Cu content. Among the alloys, the Mg-5Zn-1Cu-0.5Zr alloy exhibited the highest ultimate tensile strength (231 MPa), yield strength (127 MPa), and elongation (7.48 %) compared to the others. At higher Cu content, the formation of a reticulated MgZnCu phase, which is prone to fracture during tensile testing, results in a deterioration of tensile properties. Heat treatment (400 °C × 16 h + 200 °C × 12 h) transforms the brittle reticulated MgZnCu phase into fine particles, reduces its detrimental effect on the matrix, and promotes the precipitation of solid solution elements within the matrix. As a result, the Mg-5Zn-1Cu-0.5Zr-T6 alloy demonstrates a combination of excellent mechanical properties and TC, with a tensile strength of 254 MPa, elongation of 11.76 %, and TC of 117.64 W/(k·m). The variation in TC and mechanical properties is discussed based on microstructure observations.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"938 ","pages":"Article 148478"},"PeriodicalIF":6.1,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143937939","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":"Enhanced crack stability in micro scale fracture testing via optimized bridge notches","authors":"Eloho Okotete ,&nbsp;Alban Muslija ,&nbsp;Judith K. Hohmann ,&nbsp;Manfred Kohl ,&nbsp;Steffen Brinckmann ,&nbsp;Subin Lee ,&nbsp;Christoph Kirchlechner","doi":"10.1016/j.msea.2025.148479","DOIUrl":"10.1016/j.msea.2025.148479","url":null,"abstract":"<div><div>In micro cantilever fracture, a bridge notch geometry with material ligaments at the notch ends helps to reduce focused ion beam artefacts near the notch root by arresting initial cracks and promoting fracture from sharp, natural cracks. Thus, it significantly reduces the statistical scatter in fracture toughness, a common but undesirable feature in micro fracture testing. Although this concept has been validated in simulations and experiments, systematic investigations into the optimal geometry remain lacking. In this study, we experimentally examine the influence of bridge width and notch depth on the fracture toughness of micro cantilevers, using single crystalline silicon as a model material. We found that samples with thinner material bridges and deeper notches exhibit crack arrest before failure, while those with thicker bridges do not show crack arrest instead exhibit apparent toughening. Cantilevers with an optimized bridge notch geometry for crack arrest exhibit a <em>K</em>_<em>IC</em> of 1.09 ± 0.02 MPa m^0.5, which agrees with previously reported fracture toughness for the Si (111) surface. Additionally, discrepancies between the bridge geometry in the experiment and the ideal structure resulted in a mismatch between the predicted and observed notch requirements for crack arrest. Our findings offer practical guidelines for designing bridge notch geometries to promote bridge failure, thus improving statistical analysis in micro fracture.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"939 ","pages":"Article 148479"},"PeriodicalIF":6.1,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099434","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 exceptional strength-ductility synergy in the GH4698 nickel-based superalloy via heterogeneous grains and L12-γ′ nanoprecipitates with bimodal size distribution","authors":"Jianbing Yang ,&nbsp;Fei Liu ,&nbsp;Guidong Chen ,&nbsp;Yuanbiao Tan ,&nbsp;Xuanming Ji ,&nbsp;Siyuan Wei ,&nbsp;Boxin Wei ,&nbsp;Junyu Chen ,&nbsp;Upadrasta Ramamurty ,&nbsp;Song Xiang","doi":"10.1016/j.msea.2025.148474","DOIUrl":"10.1016/j.msea.2025.148474","url":null,"abstract":"<div><div>Structural materials with the heterogeneous microstructures offer unique combinations of strength and ductility. In this study, a nickel-based superalloy with a heterogeneous microstructure consisting of retained deformed and recrystallized grains, and the L1₂-γ′ nanoprecipitates with a bimodal size distribution, is synthesized using cryogenic rolling at 77 K, followed by annealing and aging. The larger precipitates are primarily located in the retained deformed grains, while the smaller ones are uniformly distributed throughout both the retained deformed and recrystallized grains. Benefiting from the heterogeneous structure, the alloy exhibits an exceptional strength-ductility synergy, with an ultimate tensile strength of 1612 MPa and uniform elongation of 14.2 %. During deformation, the dislocations interact with L1₂-γ′ nanoprecipitates, stacking faults, and the Lomer-Cottrell locks, which contributes to the high strength-ductility synergy. The contributions of intrinsic strengthening, grain boundary strengthening, heterogeneous deformation induced (HDI) hardening, and precipitation strengthening were quantitatively assessed. Amongst these, HDI hardening and precipitation strengthening were identified as the primary contributors to the high strength. The heterogeneous deformation between the retained deformed grains and recrystallized grains plays a significant role in enhancing the ductility. Furthermore, the evolution of the Taylor factor and textures before and after deformation was investigated. Our findings offer a strategy to design heterogeneous grain structures composing L1₂-γ′ nanoprecipitates, which achieve high strength-ductility synergy in the nickel-based superalloys.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"938 ","pages":"Article 148474"},"PeriodicalIF":6.1,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143941607","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":"Quasi-static and fatigue behavior of 316L stainless steel produced via material extrusion additive manufacturing: Insights from subtracted small-scale specimens","authors":"Saveria Spiller ,&nbsp;Nima Razavi","doi":"10.1016/j.msea.2025.148439","DOIUrl":"10.1016/j.msea.2025.148439","url":null,"abstract":"<div><div>The mechanical anisotropy of 316L Material Extrusion Additive Manufacturing parts is investigated through tensile and fatigue tests on three groups of specimens printed in different layouts. Both regular and in-situ tensile tests proved a significant dependency of the strength and ductility of the parts on the loading direction, with a sequential effect on the fracture mechanisms. Moreover, the building orientation has a secondary effect on the residual porosity, which in turn impacts the axial fatigue failure mechanisms and the statistical significance of the results. Considering the tensile test results, a favorable building direction enables the printed parts to perform similarly to their conventionally manufactured counterpart. Interestingly, the fatigue data can be fitted by fatigue design curves obtained with the standard procedure. The examination of the data collected revealed that caution is required to acknowledge the variations in the mechanical response of the parts induced by the building orientation to offer top mechanical performances. Indeed, such variations might be mitigated by improving the quality of the printing phase, with a focus on porosity reduction and material adhesion strengthening.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"938 ","pages":"Article 148439"},"PeriodicalIF":6.1,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143948566","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":"Ductile heat-resistant Mg-Gd-Y alloys of high strength via lamellated heterostructure","authors":"Jiawen Zhou,&nbsp;Yang Yang,&nbsp;Daqing Fang,&nbsp;Xiaoru Zhang,&nbsp;Hongxiang Zong,&nbsp;Xiangdong Ding,&nbsp;Jun Sun","doi":"10.1016/j.msea.2025.148466","DOIUrl":"10.1016/j.msea.2025.148466","url":null,"abstract":"<div><div>The improvement of tensile strength at elevated temperatures in light metallic alloys often compromises room temperature (RT) ductility. In this study, we focus on Mg-RE alloys to demonstrate a strategy for simultaneously achieving excellent high-temperature strength and decent RT ductility. This is accomplished by integrating a heterogeneous lamella-structure with dispersed nano-spaced stacking faults. Specifically, the small deformation but multipass hot-rolled Mg-8.5Gd-3Y-2Cu-0.5Zr (wt.%) alloys exhibit a distinctive heterogeneous lamella-structure. This structure features coarse grains interspersed with fine-grained layers and plate-shaped long-period stacking ordered (LPSO) precipitates. Such a microstructure grants the alloy a yield strength of 228 MPa at 300 °C, RT ultimate tensile strength of 538 MPa, and RT elongation of 12.2 %. The good combination of ultra-high strength and substantial ductility at RT is primarily due to the hetero-deformation induced back stress and significant activation of &lt;c+a&gt; dislocations. In addition, the dislocation cellular walls developed during the multipass hot-rolling process, can encourage mechanisms such as twinning and stacking faults formation. The excellent strength at high temperatures is as a result of the thermally stable LPSO particles which hinder grain-coarsening in the fine-grained layers.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"937 ","pages":"Article 148466"},"PeriodicalIF":6.1,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143931465","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":"Tracking phase-level properties in heat-treated high-chromium cast irons using mechanical microscopy","authors":"M.A. Guitar ,&nbsp;U.P. Nayak ,&nbsp;G. Riu-Perdrix ,&nbsp;J.M. Wheeler ,&nbsp;J.J. Roa","doi":"10.1016/j.msea.2025.148461","DOIUrl":"10.1016/j.msea.2025.148461","url":null,"abstract":"<div><div>Determining individual microstructural components in multicomponent and multiscale materials can be a challenging task. High chromium cast irons (HCCI), particularly in heat-treated states, exhibit complex microstructures that include austenite or martensite on a meso-scale, as well as hard and micro-sized eutectic carbides, and secondary carbides on a sub-micron or nanometric length scale. Assessing the mechanical properties and quantities of these phases requires small scale characterization over relatively large areas.</div><div>In the current work, the mechanical properties of each individual constitutive phase were determined by using high-speed nanoindentation maps as a function of four different heat treatments. An area of 400 × 300 μm containing 30 000 indentations on each sample was analysed. Statistical deconvolution and machine-learning clustering methods were used to determine the hardness and elastic modulus of the different microstructural components. The results illustrate how the microstructure and mechanical properties of the various phases evolve through heat treatment, supporting the notion that secondary carbides reinforce and strength the HCCI matrix, rather than acting as an individual component.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"937 ","pages":"Article 148461"},"PeriodicalIF":6.1,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143934509","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":"Simultaneous enhancement of mechanical properties and electrical conductivity in Cu-Ni-Si alloy by constrained groove pressing and aging treatments","authors":"Haoren Yang ,&nbsp;Yachang Fan ,&nbsp;Jianhui Zhou ,&nbsp;Bingbing Shi ,&nbsp;Junfeng Chen ,&nbsp;Na Lin ,&nbsp;Chen Wang ,&nbsp;Lei Xiao","doi":"10.1016/j.msea.2025.148465","DOIUrl":"10.1016/j.msea.2025.148465","url":null,"abstract":"<div><div>In this work, the Cu-Ni-Si alloy sheets with a thickness of 1.5 mm were prepared by constrained groove pressing (CGP) and aging treatments. The results show that the combination of CGP and aging treatments can simultaneously improve the mechanical properties and electrical conductivity of alloy. The sample subjected to 10 passes of CGP treatment and aged at 460 °C for 1 h exhibits optimal comprehensive properties, with a hardness of 234.8 HV, an ultimate tensile strength of 773.5 MPa, an electrical conductivity of 38.1 %IACS, and a favorable breaking elongation of 15.7 %. Compared to the peak-aged sample without CGP treatment, the hardness, ultimate tensile strength and electrical conductivity increase by 12.4 %, 15.1 % and 5.5 %, respectively. The CGP treatment can refine the grain size of alloy and increase the dislocation density, thereby promoting the precipitation of solute atoms during the aging process. The aged sample subjected to CGP treatment has a higher quantity of δ-Ni₂Si precipitates, and the formation of Ni₃Si₂ precipitates is inhibited. After aging treatment, the proportion of Σ3 grain boundary increases in the sample subjected to CGP treatment. Compared to random grain boundaries, the adjacent grains on both sides of Σ3 grain boundaries have a smaller Schmid factor mismatch, which helps to improve intergranular deformation compatibility. Moreover, the scattering effect of Σ3 grain boundaries on electrons is smaller. Therefore, the higher proportion of Σ3 grain boundary can improve the ductility and electrical conductivity of Cu-Ni-Si alloy.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"938 ","pages":"Article 148465"},"PeriodicalIF":6.1,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143937934","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 local strengthening mechanisms in CoCrFeMnNi high entropy alloy joints reinforced with Inconel 625","authors":"Jiajia Shen ,&nbsp;Jin Yang ,&nbsp;Yeon Taek Choi ,&nbsp;Rita Gonçalves ,&nbsp;Rodrigo Pedro ,&nbsp;D.A. Santana ,&nbsp;F.G. Coury ,&nbsp;N. Schell ,&nbsp;Zhi Zeng ,&nbsp;Hyoung Seop Kim ,&nbsp;J.P. Oliveira","doi":"10.1016/j.msea.2025.148452","DOIUrl":"10.1016/j.msea.2025.148452","url":null,"abstract":"<div><div>In the fusion-based welding processes, filler materials are commonly used to adjust and improve the composition of the fusion zone with the aim of optimizing both microstructure and mechanical properties. However, in the field of welding high entropy alloys, the influence of different filler materials on the microstructure and mechanical response is still scarce, owing to the yet incipient usage of welding technologies for these novel, advanced engineering alloys. To bridge this knowledge gap, Inconel 625 filler wire was used during gas metal arc welding of the well-known CoCrFeMnNi high entropy alloy. To systematically analyze the microstructure evolution and mechanical properties of the welded joints, multiscale characterization techniques were employed. It is shown that the different regions of the welded joint possess distinct microstructural features due to the weld thermal cycle, which is further compounded in the fusion zone by the introduction of the filler material. The use of Inconel 625 filler promotes a solid solution strengthening effect in the fusion zone and became the main contributor to the yield strength of this region (302 MPa (via solid solution strengthening) vs 478 MPa (yield stress from tensile experiments). Since Hall-Petch strengthening is predominant in both base material and heat affected zone, but not on the fusion zone due to the large grain structure that developed, the addition of Inconel 625 filler demonstrates to be a feasible approach to increase the typically low fusion zone strength. By coupling microstructural characterization with mechanical property analysis, aided by the calculation of the strengthening mechanisms, we unveil processing, microstructure, property relationships, providing a broader basis for the widespread application of gas metal arc welding for high entropy alloys.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"937 ","pages":"Article 148452"},"PeriodicalIF":6.1,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143934601","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}