Journal of Materials Science & Technology最新文献

{"title":"Pursuing ultrahigh strength–ductility CoCrNi-based medium-entropy alloy by low-temperature pre-aging","authors":"A.X. Li, K.W. Kang, J.S. Zhang, M.K. Xu, D. Huang, S.K. Liu, Y.T. Jiang, G. Li","doi":"10.1016/j.jmst.2024.09.025","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.09.025","url":null,"abstract":"Developing high-performance alloys with gigapascal strength and excellent ductility is crucial for modern engineering applications. The concept of multi-component high/medium entropy alloys (H/MEAs) provides an innovative approach to designing such alloys. In this work, we developed the Co_1.5CrNi_1.5Al_0.2Ti_0.2 MEA, which exhibits outstanding mechanical properties at room temperature through low-temperature pre-aging followed by annealing treatment. Tensile testing reveals that the MEA possesses an ultrahigh yield strength of 20<span><span><math><mrow is=\"true\"><mspace is=\"true\" width=\"0.33em\"></mspace><mo is=\"true\">±</mo><mspace is=\"true\" width=\"0.33em\"></mspace></mrow></math></span><script type=\"math/mml\"><math><mrow is=\"true\"><mspace width=\"0.33em\" is=\"true\"></mspace><mo is=\"true\">±</mo><mspace width=\"0.33em\" is=\"true\"></mspace></mrow></math></script></span>0785 MPa, an ultimate tensile strength of 2365 <span><span><math><mo is=\"true\">±</mo></math></span><script type=\"math/mml\"><math><mo is=\"true\">±</mo></math></script></span> 70 MPa, and exceptional ductility of 15.8% <span><span><math><mrow is=\"true\"><mo is=\"true\">±</mo><mspace is=\"true\" width=\"0.33em\"></mspace></mrow></math></span><script type=\"math/mml\"><math><mrow is=\"true\"><mo is=\"true\">±</mo><mspace width=\"0.33em\" is=\"true\"></mspace></mrow></math></script></span>1.7%. The superior tensile properties are attributed to the formation of fully recrystallized heterogeneous structures (HGS) composed of ultrafine grain (UFG) and fine grain (FG) regions, along with discontinuous precipitation of coherent nano-size lamellar L1₂ precipitates. The mechanical incompatibility between the UFG region and the FG regions during deformation induces the accumulation of a large number of geometrically necessary dislocations at the interface, resulting in strain distribution and hetero-deformation-induced (HDI) stress accumulation, contributing significantly to HDI strengthening. HDI strengthening, precipitation strengthening, and grain boundary strengthening are the primary mechanisms responsible for the ultra-high yield strength of the MEA. During deformation, the dominant deformation mechanisms include dislocation slip, deformation-induced stacking faults, and Lomer–Cottrell locks, with minor deformation twinning. The synergistic interaction of these multiple deformation modes provides the MEA with excellent work hardening capability, delaying plastic instability and achieving an excellent combination of strength and ductility. This study provides an effective strategy for synergistically strengthening MEAs by combining HDI strengthening with traditional strengthening mechanisms. These findings pave the way for the development of advanced structural materials with high performance tailored for demanding applications in engineering.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"11 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142377311","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":"300 MPa grade high-strength ductile biodegradable Zn-2Cu-xMg (x = 0.08, 0.15, 0.5, 1) alloys: The role of Mg in bimodal grain formation","authors":"Ruimin Li, Yutian Ding, Hongfei Zhang, Xue Wang, Yubi Gao","doi":"10.1016/j.jmst.2024.09.021","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.09.021","url":null,"abstract":"300 MPa grade biodegradable Zn-2Cu-&lt;em&gt;x&lt;/em&gt;Mg (0.08, 0.15, 0.5, and 1 wt.%) alloys with different bimodal grain structures were obtained by casting and hot extrusion. The effects of the Mg element on the microstructure, mechanical properties, and dynamic recrystallization (DRX) behavior of the as-extruded Zn-2Cu-&lt;em&gt;x&lt;/em&gt;Mg alloys were investigated. The obtained results showed that CuZn4 butterfly particles and eutectic net structure (&lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mi is=\"true\"&gt;&amp;#x3B7;&lt;/mi&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"1.855ex\" role=\"img\" style=\"vertical-align: -0.697ex;\" viewbox=\"0 -498.8 503.5 798.9\" width=\"1.169ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;g is=\"true\"&gt;&lt;use xlink:href=\"#MJMATHI-3B7\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;/svg&gt;&lt;span role=\"presentation\"&gt;&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mi is=\"true\"&gt;η&lt;/mi&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;mi is=\"true\"&gt;η&lt;/mi&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt;-Zn + Mg&lt;sub&gt;2&lt;/sub&gt;Zn&lt;sub&gt;11&lt;/sub&gt;) are formed in the as-cast Zn-2Cu-&lt;em&gt;x&lt;/em&gt;Mg alloys. The as-extruded Zn-2Cu-0.08Mg and Zn-2Cu-0.15Mg alloys exhibited finer DRXed and coarser unDRXed grains with an average grain size of 8.5–8.8 μm, while Zn-2Cu-0.5Mg and Zn-2Cu-1Mg alloys were almost composed of completed DRXed grains with an average grain size of 4.2–6.5 μm. Nanoprecipitates &lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow is=\"true\"&gt;&lt;mi is=\"true\"&gt;&amp;#x3B5;&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"1.509ex\" role=\"img\" style=\"vertical-align: -0.235ex;\" viewbox=\"0 -548.5 466.5 649.8\" width=\"1.083ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;use xlink:href=\"#MJMATHI-3B5\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;/g&gt;&lt;/svg&gt;&lt;span role=\"presentation\"&gt;&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;mrow is=\"true\"&gt;&lt;mi is=\"true\"&gt;ε&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;mrow is=\"true\"&gt;&lt;mi is=\"true\"&gt;ε&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt;-CuZn&lt;sub&gt;4&lt;/sub&gt; were uniformly precipitated in both DRXed regions and unDRXed regions. Continuous DRX (CDRX) and twinning-induced DRX (TDRX) were the main mechanisms at a low Mg content; Discontinuous DRX (DDRX) and particle-stimulated nucleation (PSN) were strengthened with the addition of Mg. The improved yield strengths in Zn-2Cu-&lt;em&gt;x&lt;/em&gt;Mg originate from grain boundary strengthening, Orowan strengthening, and hetero-deformation-induced (HDI) strengthening. The f","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"58 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142377285","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":"Unveiling the role of cerium in enhancing the hot ductility of super austenitic stainless steel S32654 at different temperatures","authors":"Shucai Zhang, Jiangtao Yu, Huabing Li, Zhouhua Jiang, Junyu Ren, Hao Feng, Hongchun Zhu, Binbin Zhang, Peide Han","doi":"10.1016/j.jmst.2024.09.027","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.09.027","url":null,"abstract":"The role of cerium (Ce) in enhancing the hot ductility of super austenitic stainless steel S32654 at 850–1250°C was systematically unveiled through theoretical calculations and microstructure characterization. The results indicated that Ce microalloying improved the hot ductility of S32654 throughout the entire deformation temperature range. Specifically, the addition of Ce greatly enhanced the hot ductility in the low (850–900°C) and high (1100–1250°C) temperature ranges, but only slightly increased that in the medium temperature range (900–1100°C). At 850–900°C, Ce addition not only reduced the sulfur (S) content and suppressed the S segregation at the grain boundary, but also promoted the formation of slip bands and deformation twins, apparently improving the hot ductility. At 900–1100°C, Ce addition promoted the nucleation of intergranular σ phases and dynamic recrystallization (DRX) grains, which have adverse and beneficial effects on the hot ductility, respectively. As the temperature increased, the precipitation tendency presented a first increasing and then decreasing trend around 1000°C, while the DRX gradually increased. Accordingly, the improvement degree of Ce on the hot ductility first weakened and then enhanced. At 1100–1250°C, Ce significantly promoted the DRX to form more fine and uniform deformation structure, thereby remarkably increasing the cracking resistance and then the hot ductility.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"122 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142377315","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":"Evolution of fretting wear behavior of zirconium alloy cladding tube under gross slip regime in simulated primary water of pressurized water reactor","authors":"Yusheng Zhang, Hongliang Ming, Shuji Wang, Bin Wu, Jianqiu Wang, En-Hou Han","doi":"10.1016/j.jmst.2024.09.022","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.09.022","url":null,"abstract":"The evolution of fretting wear behavior of zirconium alloy cladding tubes mated with dimples under the gross slip regime (GSR) was investigated. The findings revealed that the primary wear mechanisms under GSR were delamination, surface fatigue wear and abrasive wear, and the fretting damage rate mainly depends on delamination. The cross-sectional microstructure of the worn area could be divided into the third-body layer, tribologically transformed structure layer, and general deformation layer, with their formation mechanisms analyzed. Furthermore, the mechanism of wear-induced grain refinement was identified as dynamic recrystallization (DRX), including both continuous DRX and discontinuous DRX. Additionally, the processes of fretting wear and DRX were discussed.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"223 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142377261","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":"Constructing yolk@multi-shell free-standing anodes with porous carbon tube and SnS2 nanosheets for Si-based lithium-ion batteries","authors":"Xianping Du, Ying Huang, Zhiyuan Zhou, Chen Chen","doi":"10.1016/j.jmst.2024.09.018","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.09.018","url":null,"abstract":"Silicon-based (Si-based) materials with high specific capacity are driving the electric vehicle industry and the power storage market. However, poor electrical conductivity and volume expansion during cycling limit its further application. Rational structural designs and specific material selections can be used to create robust volume buffer structures and conductive networks, which consequently contribute to the electrochemical performance of Si materials. Herein, Si particles were encapsulated in the hollow tubular carbon fiber (HT). Further, the porous carbon layer and SnS₂ nanosheets were hierarchically assembled on the surface of fibers to create free-standing films with a yolk@multi-shell structure. The unique yolk@multi-shell structure provides sufficient reserved cavities, porous structure, and multiple buffers to significantly resist volume changes. The final electrode is endowed with a multi-dimensional integrated conductive structure by HT and SnS₂ nanosheets, which greatly improves the poor conductivity of Si-based electrodes. Finally, the free-standing films can be used directly as anodes, achieving a high specific capacity of 1513.6 mAh g^–1 after 100 cycles at 0.1 A g^–1. Additionally, the assembled full cell showed 331.4 mAh g^–1 after 100 cycles at 0.2 A g^–1, which contributes significantly to the advancement of power electronics technology.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"44 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142360105","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":"Intelligent marine waterborne epoxy coating based on functionalized multiscale nanocomposite: mechanical enhancement, self-reporting, and active/passive anti-corrosion","authors":"Hao Li, Xian-Ze Meng, Hao-Jie Yan, Run-Chao Zheng, Hui-Song Hu, Bing Lei, Qing-Hao Zhang, Lian-Kui Wu, Fa-He Cao","doi":"10.1016/j.jmst.2024.09.015","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.09.015","url":null,"abstract":"Corrosion activities and related accidents are significant issues for marine facilities, leading to considerable economic losses. Waterborne epoxy (EP) coating has been seen as one of the optimal options for corrosion protection due to its stable properties and eco-friendliness (0 g/L volatile organic compounds). Nevertheless, several intrinsic deficiencies require improvement, such as fragile mechanical properties and defects (macro and micro), resulting in the continuous deterioration of comprehensive coating performances. In this work, a novel nanocomposite coating with mechanical enhancement, intelligent self-reporting, and active protection is fabricated by integrating the functionalized and compatible graphene oxide/cerium based metal-organic framework multiscale structure (GO-CeMOF-P/M). Notably, the homogenous dispersion of GO-CeMOF-P/M and its chemical interaction with the polymer matrix effectively reduces the defects resulting from solution volatilizing and enhances the compactness, which boosts the tensile strength (32.1 MPa/8.5%) and dry adhesion force (5.8 MPa) of the coating. Additionally, the controllable responsiveness and release of multiscale nanocomposite within external environments endow intelligent active protection and self-reporting characteristics for the GO-CeMOF-P/M-EP coating, making it especially suitable for a variety of practical marine applications. Furthermore, following immersion of 80 d in the aggressive environment, <em>Z_f</em>_{=0.01 Hz} value of GO-CeMOF-P/M-EP coating is 1.2 × 10¹⁰ Ω·cm², which is 164.4 times larger than that of EP coating (7.3 × 10⁷ Ω·cm²), demonstrating remarkably strengthened anti-corrosion ability. Consequently, by offering an intriguing design strategy, the current work anticipates addressing the inherent deficiencies of EP coating and facilitating its practicality and feasibility in real sea environments.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"66 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142360125","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":"Achieving extraordinary strength and conductivity in copper wire by constructing highly consistent hard texture and ultra-high aspect ratio","authors":"Xueyuan Fan, Jiapeng Hou, Shuo Wang, Zengqian Liu, Baishan Gong, Xianghai Zhou, Qiqiang Duan, Zhenjun Zhang, Zhefeng Zhang","doi":"10.1016/j.jmst.2024.09.017","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.09.017","url":null,"abstract":"Simultaneously improving the strength and electrical conductivity of conducting metallic materials is of great significance, but it still remains a key challenge as the two properties are often mutually exclusive. In this study, we demonstrate a “&lt;111&gt; oriented fibrous grains with ultra-high aspect ratio” strategy for breaking such a conflict in Cu wire, which relies on the distinctive spatial distribution of grain boundaries and the highly consistent hard orientation to play their respective roles in suffering loading and conducting, thereby enabling a separate optimization of both strength and electrical conductivity. Therefore, a processing route was designed, involving directional solidification followed by large drawing deformation, to successfully construct fibrous grains with an ultra-high aspect ratio in 596.7 and ultra-high &lt;111&gt; texture proportion over 97%, which achieves Cu wire with a remarkable combination of yield strength in 482.3 MPa and electrical conductivity in 101.63% IACS. Finally, the mechanisms for high strength and high electrical conductivity were quantitatively discussed.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"58 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142360104","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":"“Two birds one stone” strategy to integrate electromagnetic wave absorption and self-anticorrosion in magnetic nanocomposites with double-shell hollow structure","authors":"Zhiqiang Guo, Di Lan, Chuanhui Zhang, Zhenguo Gao, Muyi Han, Xuetao Shi, Mukun He, Hua Guo, Zirui Jia, Guanglei Wu","doi":"10.1016/j.jmst.2024.09.020","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.09.020","url":null,"abstract":"Magnetic metal has broad application prospects in the field of electromagnetic wave (EMW) absorption due to its excellent dielectric and magnetic properties. However, high density and poor chemical stability constrain their development potential. The combination of magnetic metals with other lightweight carbon materials is an effective solution. In this work, magnetic nanoparticle fiber composites were prepared by electrostatic spinning and high-temperature annealing processes. By adjusting the preparation process and annealing temperature, Co/Co₇Fe₃/CF-800 fiber composites containing double-shell hollow structured nanocubes were cleverly synthesized. The material is mixed with paraffin wax and has a minimum reflection loss (RL) of –52.14 dB and a maximum effective absorption bandwidth (EAB) of 6.16 GHz at a load of 10 wt%. By analyzing the electromagnetic parameters of the material, it was demonstrated that the material absorbs EMW through the synergistic effect of dielectric and magnetic losses. Electrochemical testing in a simulated seawater environment demonstrated that the material also has a degree of self-anticorrosion capability. This work provides new strategies for designing materials with excellent electromagnetic wave absorption and self-anticorrosion properties.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"38 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142360102","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":"Highly hygroscopic needle-punched carbon fiber felt with high evaporative cooling efficiency and fire resistance for safe operation of ultrahigh-rate lithium-ion batteries","authors":"Shanchi Wang, Zhiguang Xu, Juan Zhang, Fang Guo, Zhenzhen Wei, Tao Zhang, Yan Zhao","doi":"10.1016/j.jmst.2024.09.016","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.09.016","url":null,"abstract":"The effective thermal management of lithium-ion batteries is the key to ensuring their fast charging-discharging, safe and efficient operation. Herein, inspired by transpiration-driven water transport in plants, we report a highly hygroscopic needle-punched carbon fiber felt (HS/CFF) with high evaporative cooling efficiency and fire resistance for the safe operation of lithium-ion batteries working at ultrahigh-rate conditions. The three-dimensional fiber skeleton structure constructed by needle punching in the carbon fiber felt enables effective water transport and storage in HS/CFF, without any water leakage. At an ultra-high discharge rate of 10 C, HS/CFF can reduce the maximum temperature of commercial lithium-ion batteries by 18 °C, and can keep the battery temperature below 60 °C. During 500 cycles of charge-discharge, HS/CFF maintains stable evaporative heat dissipation performance, which helps to improve the safety of lithium-ion batteries and extend their service life. Moreover, HS/CFF remains non-combustible even under exposure to a flame (600-700 °C) for 10 min, and the HS/CFF can be reused after the burning test, with the original excellent heat dissipation effect unchanged. This flexible, fire-resistant cooling material offers a promising avenue for low-energy intelligent thermal management of lithium-ion batteries and other heat-generating electronic devices.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"22 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142360106","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":"Diameter-dependent thermal conductivity of carbon nanotubes","authors":"Hai-Bo Zhao, Dai-Ming Tang, Lili Zhang, Meng-Ke Zou, Rui-Hong Xie, Chang Liu, Hui-Ming Cheng","doi":"10.1016/j.jmst.2024.09.019","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.09.019","url":null,"abstract":"Carbon nanotubes are uniquely featured by the nanoscale tubular structure with a highly-curved surface and defined chirality. The diameter and chirality fundamentally determine their stability and electrical and thermal properties. Up to now, the relationship between the intrinsic thermal conductivity and the atomic features of CNTs has not been established, due to the challenges in precise measurements and characterizations. In this work, we develop a micro electro-thermal device enabling simultaneous thermal measurements by Raman spectroscopy and atomic structural characterization by transmission electron microscopy for individual CNTs. The influence of diameter and chirality is systematically investigated. In addition, the temperature dependence of the thermal conductivity was extracted from parameter optimization of finite-element modeling. It is found that the thermal transport of CNTs depends mainly on the diameter, while the chiral angle has no significant influence. Along with increasing diameter, the room temperature thermal conductivity increases and eventually approaches the limit of flat graphene.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"220 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142360103","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}