Journal of Materials Science & Technology最新文献

{"title":"Flexible multifunctional polydimethylsiloxane composites with segregated structure fabricated by hydrophobic interaction for efficient electromagnetic interference shielding","authors":"Weirui Zhang, Zhongjie He, Jinliang Xie, Fangfang Su, Yangyang Xin, Dongdong Yao, Mingxiang Li, Yudeng Wang, Yaping Zheng","doi":"10.1016/j.jmst.2024.08.059","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.08.059","url":null,"abstract":"The formation of segregated structure has been demonstrated as an effective strategy for achieving exceptional electromagnetic interference (EMI) shielding performance at low filler loadings. However, the acquisition of polymer particles and the formation of interactions with conductive fillers remain significant challenges for polydimethylsiloxane, which are crucial to the construction of a segregated structure. In this work, MXene sheets were functionalized and assembled onto the surface of polydimethylsiloxane microspheres via hydrophobic interaction. Subsequently, functionalized MXene/polydimethylsiloxane (FMP) composites with a segregated structure were fabricated by filtration and hot-pressing. The FMP composite containing 8.22 wt.% MXene exhibited a high electrical conductivity of 99.4 S·m^-1 and a satisfactory EMI shielding effectiveness/thickness (EMI SE/d) of 31.3 dB·mm^-1. Furthermore, the FMP composite demonstrated excellent reliability with over 90% retention of EMI shielding effectiveness under harsh environments such as ultra-high/low temperatures and acidic/alkaline solutions. Additionally, the photothermal conversion performance of FMP composites and the capacitive sensing performance of the sensor based on FMP composites indicated their potential for managing body temperature and monitoring human movement. Consequently, FMP composites show great promise in wearable electronics for effective electromagnetic interference shielding, thermal management and capacitive sensing.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":null,"pages":null},"PeriodicalIF":10.9,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142313458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 polyacrylic acid on the corrosion behavior of Alloy 690 in pressurized water reactor secondary water","authors":"Zhiyuan Zhang, Zhiming Zhang, Jianqiu Wang, Hongliang Ming, Haipeng Zhu, Tichun Dan, Ruoyu Wang, Beibei Gao, En-Hou Han","doi":"10.1016/j.jmst.2024.09.011","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.09.011","url":null,"abstract":"The effect of polyacrylic acid (PAA) on the corrosion behavior of Alloy 690 in simulated pressurized water reactor secondary water was investigated. The duplex oxide film structure, consisting of a Ni-rich outer layer and a Cr-rich inner layer, was maintained regardless of PAA presence. PAA inhibited the growth of outer Ni-rich particles while promoting Cr enrichment in the inner layer and inducing its amorphization, both enhancing oxidation resistance. However, excess PAA (≥ 500 ppb) suppressed protective oxide formation during initial oxidation, leading to oxygen penetration into the matrix. A PAA concentration of around 250 ppb is considered optimal for steam generators, as it provides the benefits of PAA without adverse effects on the alloy.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":null,"pages":null},"PeriodicalIF":10.9,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142313456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Atomistic simulations of dislocation behaviors in Cr-Mn-Fe-Co-Ni high-entropy alloys with different Cr/Ni ratio","authors":"Yu Tian, Fei Chen","doi":"10.1016/j.jmst.2024.08.058","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.08.058","url":null,"abstract":"Pronounced compositional fluctuations in CrMnFeCoNi high-entropy alloys (HEAs) lead to variations of the stacking-fault energy (SFE), which dominates the dislocation behavior and mechanical properties. However, studies on the underlying dislocation behaviors and deformation mechanisms as a function of composition (Cr/Ni ratio) within CrMnFeCoNi HEAs are largely lacking, which hinders further understanding of the composition-structure-property relationships for the rational design of HEAs. Atomistic simulations were employed in this study to investigate the core structures and dynamic behaviors of a/2<110> edge dislocations in non-equiatomic CrMnFeCoNi HEA, as well as its plasticity mechanisms. The results show that the core structure of a/2<110> edge dislocations is planar after energy minimization, but with significant variations in the separation distance between two partial dislocations along the dislocation line owing to the complex local composition. The effects of the Cr/Ni ratio on the dislocation-solute interactions during dislocation gliding were calculated and discussed. Additionally, snapshots of dislocation motion under shear stress were analyzed. The observations indicate that the strengthening of the non-equiatomic CrMnFeCoNi HEA with increasing Cr concentration is not contributed by the expected solute/dislocation interactions, but the observed events of edge extended dislocation climbing through jog nucleation. The unusual but reasonable dislocation climbing phenomenon and the resultant strengthening observed in this study open extraordinary opportunities for obtaining outstanding mechanical properties in non-equiatomic CrMnFeCoNi HEAs by tailoring the compositional variations.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":null,"pages":null},"PeriodicalIF":10.9,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142313526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Revealing the coarsening behavior of precipitates and its effect on the thermal stability in Tʹ and ηʹ dual-phase strengthened Al-Zn-Mg-Cu alloys","authors":"Yan Zou, Lingfei Cao, Xiaodong Wu, Chenglin Mou, Songbai Tang","doi":"10.1016/j.jmst.2024.09.010","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.09.010","url":null,"abstract":"High-strength Al-Zn-Mg-Cu alloys are widely utilized, but their strength deteriorates as strengthening precipitates coarsen rapidly at elevated temperatures, limiting their applications above 150°C. This study systematically investigates the microstructure evolution and its impact on the properties of peak-aged Al-Zn-Mg-Cu alloys with varying Zn/Mg ratios during thermal exposure at a series of temperatures from 150 to 300°C for 500 h. The results reveal that alloys A1 and A2 with an optimal Zn/Mg ratio (1.50−2.14) and relatively lower (Zn + Mg) content (7.0−8.8 wt.%), exhibit superior heat resistance properties compared to the other three alloys. Despite having lower strength relative to alloys with higher solute content, peak-aged alloys A1 and A2 retain the highest strength after thermal exposure. This performance is attributed to the high proportion (over 80%) of T′/T phases in the precipitates for alloys A1 and A2, which demonstrate better thermal stability in comparison to η′/η phases. Additionally, the lower solute content reduces the driving force for diffusion of Zn and Mg atoms, thus inhibiting the coarsening of precipitates. Moreover, the study elucidates that the coarsening mechanism of precipitates transitions from interfacial diffusion control at 150°C to matrix diffusion control at 200−300°C. These insights into the composition-dependent coarsening behavior of precipitates in dual-phase strengthened Al-Zn-Mg-Cu alloys offer valuable guidance for designing heat-resistant aluminum alloys with enhanced performance at elevated temperatures.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":null,"pages":null},"PeriodicalIF":10.9,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142313457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 oxidation resistance via grain boundary engineering in L12-strengthened medium entropy alloys","authors":"Shaoxin Cai, Jingping Cui, Zhihong Dong, Weiyan Lv, Baijun Yang, Dong Han, Jianqiang Wang","doi":"10.1016/j.jmst.2024.09.007","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.09.007","url":null,"abstract":"<p>The concept of grain boundary engineering (GBE) has been successfully applied to L1₂-strengthened (CoCrNi)₉₄Al₃Ti₃ medium entropy alloy, with the aim of improving the oxidation resistance by increasing the ratio of special boundaries and suppressing discontinuous precipitation. Surprisingly, our results reveal that GBE treatment not only slows down the oxidation kinetics and but also alters the oxide scale from TiO₂ and multi-defect Cr₂O₃ to continuous and protective Cr₂O₃ and Al₂O₃, thereby contributing to an enhanced oxidation and anti-spalling resistance. The GBE treatment reduces the oxidation weight gain of the current alloy from 1.950 mg cm^–2 to 1.211 mg cm^–2 after 100 h of cyclic oxidation at 800 °C. The findings show that the extensive outward diffusion of Ti accelerates ion transport and promotes microporosity, thus leading to more defects being formed in the oxide film. The GBE treatment suppresses the discontinuous precipitation of the Ti-bearing L1₂ phase and breaks the random large angular grain boundaries network, inhibiting the diffusion of Ti and ultimately enhancing the oxidation properties of the alloy. The current work provides an idea of oxidation resistance enhancement for Ti-bearing L1₂-strengthened alloys without changing the alloy composition.</p>","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":null,"pages":null},"PeriodicalIF":10.9,"publicationDate":"2024-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142275315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"All-2D asymmetric self-powered photodetectors with ultra-fast photoresponse based on Gr/WSe2/NbSe2 van der Waals heterostructure","authors":"Sixian He, Chengdong Yin, Lingling Zhang, Yafei Chen, Hui Peng, Aidang Shan, Liancheng Zhao, Liming Gao","doi":"10.1016/j.jmst.2024.08.055","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.08.055","url":null,"abstract":"<p>The rise of smart wearable devices has driven the demand for flexible, high-performance optoelectronic devices with low power and easy high-density integration. Emerging Two-dimensional (2D) materials offer promising solutions. However, the use of 3D metal in traditional 2D devices often leads to Fermi-level pinning, compromising device performance. 2D metallic materials, such as graphene and 2H-phase NbSe₂, present a new avenue for addressing this issue and constructing high-performance, low-power photodetectors. In this work, we designed an all-2D asymmetric contacts photodetector using Gr and NbSe₂ as electrodes for the 2D semiconductor WSe₂. The asymmetric Schottky barriers and built-in electric fields facilitated by this architecture resulted in outstanding photovoltaic characteristics and self-powered photodetection. Under zero bias, the device exhibited a responsivity of 287 mA/W, a specific detectivity of 5.3 × 10¹¹ Jones, and an external quantum efficiency of 88%. It also demonstrated an ultra-high light on/off ratio (1.8 × 10⁵), ultra-fast photoresponse speeds (80/72 μs), broad-spectrum responsiveness (405–980 nm), and exceptional cycling stability. The applications of the Gr/WSe₂/NbSe₂ heterojunction in imaging and infrared optical communication have been explored, underscoring its significant potential. This work offers an idea to construct all-2D ultrathin optoelectronic devices.</p>","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":null,"pages":null},"PeriodicalIF":10.9,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142275322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Single parameter controlling the substructure and the hardening by martensitic transformation","authors":"Ning Lu, Yong Li, Haidong Sun, Liu Yang, Peng Wang, Changji Li, Pinwen Zhu, Dongli Yu, Hongwang Zhang","doi":"10.1016/j.jmst.2024.08.052","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.08.052","url":null,"abstract":"<p>In the present study, a single parameter governing the substructure and the strengthening for martensitic transformation was tentatively explored by detailing the microstructure and the strengthening of a Fe-15 wt.%Cr binary alloy subjected to thermal cycle under high pressure (cooled at 10°C s^–1 from 1050°C under hydrostatic pressure of 1.0–4.0 GPa). Experimental results show that high pressure makes martensitic transformation occur in a Fe-15Cr alloy that traditionally has no high-temperature austenite under atmospheric pressure. The phase transformation begins with the pairing of twinned variants, and the strengthening is solely dependent upon the density of dislocations and variants. The austenite strength at the transformation temperature governs the substructure and the induced strengthening by influencing: (1) The critical size below which twinned variants are solely allowed; (2) the orientation spreading of the pioneer twinned variants toward Bain pairs; (3) the variant thickness and in turn the strengthening extent. The present study sheds light on tuning the substructure and hardening during martensitic transformation via the austenite strength, showing potential scientific and technological importance.</p>","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":null,"pages":null},"PeriodicalIF":10.9,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142275316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Formation mechanism of Al-O intergranular amorphous phase toughened nanoscale ZrB2-ZrC composite coating synthesized by reactive plasma spraying","authors":"Yu-hang Cui, Yong Yang, Dian-long Wang, Yan-wei Wang","doi":"10.1016/j.jmst.2024.06.059","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.06.059","url":null,"abstract":"<p>A new nanostructured ZrB₂-ZrC composite coating with ZrB₂-ZrC nanoscale eutectic and ZrB₂+Amorphous microstructure was synthesized in situ by plasma spraying Zr-B₄C-Al composite powder. The thermal analysis, quenching experiments and microstructure characterization were investigated and the formation mechanism of the bimodal in-situ microstructure was revealed. Al contributed to the liquid phase separation of molten droplets, which is the key to forming ZrB₂+Amorphous microstructure. The formation of coating followed reaction-melting-liquid separation-deposition and solidification mechanism. The nanostructured ZrB₂-ZrC composite coating with Al-O intergranular amorphous phase has excellent mechanical properties. The uniform nano-grains improved the hardness and the toughness of the ZrB₂-ZrC eutectic. The ZrB₂+Al-O amorphous microstructure obtained high toughness and the toughening mechanism was the crack deflection and crack branching caused by intergranular Al-O amorphous phase.</p>","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":null,"pages":null},"PeriodicalIF":10.9,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142247031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rare earth oxides CeO2 nanoparticle embedded magnetic carbon nanofibers for electro-magnetic cooperation and efficient electromagnetic wave absorption","authors":"Baoding Li, Yanli Deng, Chang Liu, Jing Qiao, Shanyue Hou, Na Wu, Fan Wu, Zhihui Zeng, Jiurong Liu","doi":"10.1016/j.jmst.2024.08.044","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.08.044","url":null,"abstract":"<p>Multicomponent composites are considered conducive to electromagnetic wave (EMW) absorption, as multiple loss synergistic effect from each component, enhance the attenuation ability of EMW and optimize impedance matching. In this study, carbon material was modified by both semi-conductive and magnetic matters to improve their absorbing performance. The carbon-based fibrous composites of CeO₂ and Co were prepared by electrospinning and subsequent carbonization. At a filling rate of 35 wt.%, the CeCoC nanocomposite fibers exhibit a minimum RL value of -61.4 dB at 2.2 mm, and an effective absorption bandwidth (EAB) of up to 7.6 GHz. The excellent absorbing performance is derived from the improved dielectric loss and optimized impedance matching. The introduction of rare earth oxide CeO₂ not only helps to maintain the fibrous structure, but also promotes conduction loss. Especially, oxygen vacancy defects introduced by CeO₂ greatly improved the dielectric loss capacity. The introduction of Co particles optimizes the impedance matching to reduce the matching thickness and strengthen magnetic loss. This study demonstrates the potential of rare earth oxides in improving EMW absorption performance, and opens up new opportunities for the development of advanced materials for high-performance EMW absorption applications.</p>","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":null,"pages":null},"PeriodicalIF":10.9,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142247032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spreadable thermosensitive nanocomposite hydrogel dressing with ultrasound-responsive bactericidal/repair-promoting regulation and cascade antioxidantion for infected burn wound repair","authors":"Meng Yu, Yi Guo, Shaowen Zhou, Yanhuai Li, Zexing Deng, Xin Zhao, Yong Han","doi":"10.1016/j.jmst.2024.08.054","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.08.054","url":null,"abstract":"<p>Treating severe burn wounds poses significant challenges, including considerable cell loss, excessive inflammation, and a high susceptibility to bacterial infections. Ideal burn dressings should exhibit excellent antibacterial properties, anti-inflammatory effects, and promote cell proliferation. Additionally, they need facilitate painless dressing changes and be user-friendly. Herein, we synthesized a thermosensitive hydrogel by crosslinking poly (N-isopropylacrylamide-co-allyloxybenzaldehyde) (PNA) and amino-terminated Pluronic F127 (APF) through a Schiff base reaction. It exhibited reversible gel-sol transition and spreadability. By incorporating piezoelectric gold nanoparticle-modified barium titanate (Au@BaTiO₃) and cascade antioxidant MOF-818, a nanocomposite hydrogel dressing with diverse bioactive functionalities was developed. Results demonstrated that the nanocomposite hydrogel possessed gel-sol transition properties, maintained a stable gel state within a broad temperature range, and desirable self-healing property. Au@BaTiO₃ exhibited good piezoelectric properties and ROS generation upon ultrasound stimulation, while MOF-818 displayed highly efficient cascade nanozyme activity. The combination of Au@BaTiO₃ and MOF-818 promoted fibroblast proliferation and migration, reduced intracellular ROS levels, and induced anti-inflammatory polarization of macrophages under ultrasound stimulation. <em>In vitro</em> and <em>in vivo</em> antibacterial results disclosed that the nanocomposite hydrogel had excellent antibacterial activity under high-intensity ultrasound stimulation. When applied to infected burn wounds, the nanocomposite hydrogel can rapidly sterilize the wound upon initial high-intensity ultrasound, and then reduce inflammation and promote M2 macrophage polarization by the following low-intensity ultrasound stimulation, and thus accelerating the healing by improving granulation tissue formation, angiogenesis, and collagen deposition.</p>","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":null,"pages":null},"PeriodicalIF":10.9,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142247029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}