Journal of Materials Science & Technology最新文献

{"title":"Insight into the influence of melt superheat on flow field dynamics and particle morphology in gas-atomized Fe-based amorphous alloys: Simulation and experimental","authors":"Zhongliang Zhou, Wenhai Sun, Weiyan Lu, Suode Zhang, Jianqiang Wang","doi":"10.1016/j.jmst.2025.09.029","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.09.029","url":null,"abstract":"Powder morphology exerts a profound influence on the forming quality of additive-manufactured components, which is vastly dependent upon the control of the gas atomization process. This work systematically investigates the impact of melt superheat upon atomization flow field dynamics and particle morphology for Fe-based amorphous alloys across a superheat temperature range of 250–400 K in terms of combined numerical simulations and experiments. A multistage numerical model incorporating secondary breakup and solidification deformation was developed using the realizable k-ε turbulence model, discrete phase model, and volume of fluid method. Results reveal that there is a slight influence on the flow field at lower superheats (250–350 K). Yet, at a superheat up to 400 K, the recirculation zone elongates and the secondary acceleration zone disappears, which leads to an increment in the proportion of fine droplets and a transition in the droplet size distribution from normal to monotonically declining tendency. In the droplet solidification deformation stage, a higher superheat or larger initial droplet diameter appears to enhance the solidification time, beneficial to yield spherical powder. Further, a novel criterion for spherical powder formation was established in relation to the Weber number (We). The experimental data depict that the proportion of spherical powder improves substantially, from 23% to 74%, as superheat rises from 250 to 400 K, closely matching theoretical predictions. This in-depth understanding of powder formation mechanisms in gas atomization provides valuable guidance for optimizing spherical powder yield.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"2020 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145182810","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 exceptional ultra-high-speed rubbing resistance in NiAlTa/cBN composites through precise structural and compositional design","authors":"Shuai Yang, Siyang Gao, Weihai Xue, Bi Wu, Deli Duan","doi":"10.1016/j.jmst.2025.09.027","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.09.027","url":null,"abstract":"Friction and wear cause about 23% of global energy consumption in terms of energy and material loss, so reducing and controlling wear is a relentless pursuit. Realizing wear resistance under extreme operating conditions (ultra-high speeds, ultra-high temperatures, and ultra-high strain rates) is the pursuit of material design. Here, a NiAlTa/cBN composite is developed for high-temperature turbine blade tips to achieve wear and impact resistance through precise material component and structure design. The composite exhibits the lowest incursion depth ratio reported to date. This excellent ultra-high-speed rubbing resistance stems from the high thermal-softening resistance of its intrinsic structure and the synergistic hardening induced by multiple deformation pathways (superdislocations, FCC→HCP phase transitions, faults, and deformation twins). The optimized design of the metal/ceramic interface and the tribo-induced tribo-layers with heterostructures also contribute to the excellent ultra-high-speed rubbing resistance. At high strain rates, the atomic order-to-disorder transition at the interface can effectively coordinate plastic deformation and dissipate impact strain energy.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"21 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145153625","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":"Mg-content dominates irradiation hardening in Al alloys by controlling the defect rounding at the initial stage","authors":"Zuojiang Wang, Ling Li, Shangquan Zhao, Ziqi Cao, Shikun Zhu, Yizhong Yang, Yibin Tang, Hongchang Wang, Xujia Wang, Guang Ran","doi":"10.1016/j.jmst.2025.09.026","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.09.026","url":null,"abstract":"Solute elements significantly control the mechanical properties of aluminum (Al) alloys, yet the correlation between irradiation-induced microstructures, mechanical properties, and the interaction mechanism of solute magnesium (Mg) atoms with defects remains unclear to date. The influence of solute Mg atoms on irradiation defects and hardening behavior in Al alloys was systematically investigated via in-situ ion irradiation, nanoindentation, and first-principles calculations. The results revealed a strong correlation between Mg content, microstructural evolution, and irradiation hardening. Increasing Mg content inhibits the growth and interaction of dislocation loops at the initial stage, postponing the formation of the network unit and thereby reducing their size. This leads to alloys with high Mg-content exhibiting a lower number density of dislocation network junctions and delayed irradiation hardening at the same dose. In contrast, dislocation loops in low Mg-content Al alloys experience less growth impediment and tend to evolve into elongated morphologies along preferential directions. These phenomena can be attributed to the formation of solute-defect pairs, where Mg atoms—due to their larger atomic size and weak bonding with Al atoms—generate local elastic fields that preferentially trap vacancies. Although higher Mg content enhances initial solute strengthening, excessive Mg may promote solute clustering—leading to more clusters formed after irradiation. Increasing Mg also strengthens the local barrier effect on point defects. These contribute to inhibiting defect rounding and result in a smaller average size and higher number density of dislocation loops at low doses. Further, the formation of solute-defect pairs influences the kinetics of network formation. These findings provide new insights into the composition-defect-property relationship in irradiated Al alloys and offer guidance for the design of Al alloys for nuclear applications.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"95 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145182785","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":"Improved hardenability of medium-carbon steel by tuning V distribution at grain boundaries","authors":"Xinyao Zhang, Chen Chen, Qian Li, Ting Zhao, Dongyun Sun, Sha Liu, Zhinan Yang, Bo Lv, Fucheng Zhang","doi":"10.1016/j.jmst.2025.09.028","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.09.028","url":null,"abstract":"Vanadium (V) segregation at grain boundaries has been proven to enhance hardenability of steels, while methods of maximizing the effect of V and further improving the mechanical properties of steels still need to be explored continuously. This study introduces a two-step austenitization isothermal process to investigate its effects on enhancing the hardenability and mechanical properties of V-microalloyed steel, i.e., 40CrNiMoV steel. The results demonstrate that the two-step austenitization isothermal process (1000°C × 30 min followed by 860°C × 2 min) enhances both the hardenability and mechanical properties of the test steel compared to conventional single-step treatment (1000°C × 30 min). The specific two-step austenitization isothermal process, i.e., undergoing the first step of the austenitization isothermal process, followed by cooling to 860°C and isothermal holding for 2 min, promotes the uniform segregation of V at grain boundaries in the test steel. This leads to a significant reduction in grain boundary energy, thereby stabilizing austenite and delaying α-phase transformation, which substantially enhances the hardenability. The exceptional hardenability of the test steel promotes the formation of a high density of high-angle grain boundaries in the post-treatment microstructure. Additionally, it refines the martensite/bainite lath thickness. Such dual effects synergistically improve the mechanical properties of the test steel.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"92 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145153626","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":"Hierarchically architected biomass-derived magnetic aerogels for broadband electromagnetic attenuation and functionalities","authors":"Jiachen Sun, Lin Chen, Zhongru Ren, Linhe Yu, Di Liu, Huanqin Zhao, Qianpeng Zhang, Xin Sun, Xiaoliang Mo, Hualiang Lv","doi":"10.1016/j.jmst.2025.08.062","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.08.062","url":null,"abstract":"Lightweight, broadband, and thermally insulating absorbers are vital for miniaturized and integrated electronics. However, conventional materials are constrained by insufficient attenuation capability, high density, and high thermal conductivity, limiting their practical application. Herein, we report the synthesis of biomass aerogels derived from pomelo peel cellulose nanosheets via an ice-templated confined self-assembly strategy. The introduction of metallic iron nanoparticles enables carbon nanotubes to grow in situ and form a continuous three-dimensional conductive network, while maintaining ultra-high porosity. This hierarchical structure significantly enhances the electrical transmission and compensates for the inherent weak dielectric loss of traditional aerogels. The embedded metal particle assembly introduces an additional loss mechanism, and the retained porosity helps to achieve ultra-low density and excellent thermal insulation performance. Therefore, aerogel shows a peak reflection loss of −63.95 dB and an ultra-wide effective absorption bandwidth of 7.44 GHz, showing excellent broadband electromagnetic absorption. In addition, it can still maintain excellent absorption performance and heat insulation performance at temperatures up to 200°C, confirming its robust thermal stability. These findings provide a promising pathway toward the development of next-generation multifunctional absorbers for compact, thermally resilient, and reconfigurable electronic applications.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"96 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145182787","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":"Tailored strain–octahedral–defect interplay for giant multiferroicity in BiFeO3 via scandium implantation","authors":"Yongshen Lu, Wen Zhang, Ziheng Chen, Fangwang Fu, Jinyong Zhang, Lin Ren, Weimin Wang, Fan Zhang, Zhengyi Fu","doi":"10.1016/j.jmst.2025.07.076","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.07.076","url":null,"abstract":"The escalating demand for high-performance nonvolatile memories, driven by the rapid evolution of artificial intelligence hardware, highlights the urgent need for breakthroughs in multiferroic thin-film engineering. While environmentally benign bismuth ferrite (BFO) thin films exhibit intrinsic ferroelectric-ferromagnetic duality, their performance suffers considerable degradation because of dimensional scaling effects and stochastic percolation of oxygen vacancies (<span><span style=\"\"></span><span data-mathml='<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msubsup is=\"true\"><mi mathvariant=\"normal\" is=\"true\">V</mi><mrow is=\"true\"><mi mathvariant=\"normal\" is=\"true\">O</mi></mrow><mrow is=\"true\"><mo is=\"true\">•</mo><mo is=\"true\">•</mo></mrow></msubsup></math>' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"><svg aria-hidden=\"true\" focusable=\"false\" height=\"2.779ex\" role=\"img\" style=\"vertical-align: -1.043ex;\" viewbox=\"0 -747.2 1558.3 1196.3\" width=\"3.619ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><g is=\"true\"><g is=\"true\"><use xlink:href=\"#MJMAIN-56\"></use></g><g is=\"true\" transform=\"translate(750,306)\"><g is=\"true\"><use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-2219\"></use></g><g is=\"true\" transform=\"translate(353,0)\"><use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-2219\"></use></g></g><g is=\"true\" transform=\"translate(750,-335)\"><g is=\"true\"><use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-4F\"></use></g></g></g></g></svg><span role=\"presentation\"><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msubsup is=\"true\"><mi is=\"true\" mathvariant=\"normal\">V</mi><mrow is=\"true\"><mi is=\"true\" mathvariant=\"normal\">O</mi></mrow><mrow is=\"true\"><mo is=\"true\">•</mo><mo is=\"true\">•</mo></mrow></msubsup></math></span></span><script type=\"math/mml\"><math><msubsup is=\"true\"><mi mathvariant=\"normal\" is=\"true\">V</mi><mrow is=\"true\"><mi mathvariant=\"normal\" is=\"true\">O</mi></mrow><mrow is=\"true\"><mo is=\"true\">•</mo><mo is=\"true\">•</mo></mrow></msubsup></math></script></span>). Herein, we introduce a quantum-engineered implantation strategy utilizing scandium ions (Sc<sup>3+</sup>) as metastable interstitial dopants to systematically establish self-adaptive lattice-oxygen vacancy equilibria through quantum-confined interactions. Atomic-resolution electron microscopy and multiferroicity scaling behavior analysis reveal that precise Sc<sup>3+</sup> implantation (dose: 10<sup>15</sup> ions·cm<sup>−2</sup>) induces a quantum-confined strain field and vacancy dipole ordering, synergistically enhancing ferroelectric polarization to 158.6 μC/cm<sup>2</sup> while suppressing leakage currents to 10⁻<sup>8</sup> A/cm². Concurrently, strain-mediated magnetoelectric coupling elevates saturation magnetization","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"42 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145153668","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":"Construction of In-modified CN-based photocatalyst with In‒N chemical bond for efficient photoreduction of CO2","authors":"Qi Qi, Wenjing Shen, Yan Yan, Yanfen Fang, Yifan Zhang, Xu Tang, Pengwei Huo","doi":"10.1016/j.jmst.2025.08.061","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.08.061","url":null,"abstract":"Graphitic carbon nitride (g-C₃N₄), as an efficient photocatalytic material, has garnered significant attention in CO₂ reduction. However, its practical application is hindered by the high recombination rate of photogenerated charge carriers and insufficient product selectivity. In this study, an indium (In)-modified polymeric carbon nitride (In-PCN) catalyst was successfully synthesized via calcination of MIL-68(In) precursor with urea, aiming to systematically investigate its regulatory mechanism in photocatalytic CO₂ reduction. Experimental characterizations revealed that trace amounts of In were uniformly incorporated into the PCN framework through In‒N bonds, preserving its layered porous structure while significantly enhancing charge carrier separation efficiency and reducing interfacial charge transfer resistance. Under visible-light irradiation, the In-PCN exhibited a CO production rate of 19.37 μmol g⁻¹ h⁻¹ with 91.5% selectivity, representing a 2.2-fold enhancement compared to pristine PCN, and maintained stable activity over 16 h of cyclic operation. In situ Fourier transform infrared (in-FTIR) spectroscopy and density functional theory (DFT) calculations demonstrated that In sites stabilize the critical intermediate *COOH (Δ<em>G</em> decreased from +2.02 eV to +1.03 eV) and optimize electron transfer pathways, thereby significantly lowering the activation energy barrier for CO₂ reduction. Furthermore, the incorporation of In suppresses the generation of H₂ and increases the reduction efficiency of CO₂ by preventing the dissociation of H₂O molecules on the catalyst surface. Band structure analysis further revealed that In doping reconstructs the electronic distribution of PCN, enhancing surface charge density to promote CO₂ adsorption and selective reduction. This work provides theoretical insights and experimental validation for the rational design of metal-modified PCN catalysts with a chemical coordination environment, advancing their application in efficient and selective photocatalytic CO₂ conversion.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"22 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145153657","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 ability, thermal/mechanical properties and hydrogen permeability of high entropy TiZrHf0.5Nb0.5CoNiCu amorphous and amorphous plus B2 alloys","authors":"C.J. Chen, S. Yamaura, T. Nakata, R. Zhao, F.L. Kong, H. Wang, A. Inoue","doi":"10.1016/j.jmst.2025.09.022","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.09.022","url":null,"abstract":"High entropy TiZrHf_0.5Nb_0.5CoNiCu alloys with amorphous (Am) and Am+B2 mixed phases were synthesized in the melt-spun ribbons with different thicknesses of 32 μm to 102 μm. The as-spun structure consists of an Am phase for the ribbons with thicknesses below 80 μm and changes to Am+B2 phases for the ribbons with larger thicknesses. The B2 phase has a spherical morphology and its diameter and volume fraction are 0.5–5 μm and approximately 5% for the ribbon with a thickness of 102 μm. No difference in alloy composition between amorphous and B2 phases is recognized. The Am phase crystallizes through two stages: Am→Am'+B2→B2+Cu₁₀Zr₇+bcc-Nb. The B2 precipitates have extremely fine particle sizes of approximately 20–30 nm, and their volume fraction is as large as approximately 60–70%. The tensile yield and fracture strengths of the amorphous+B2 phase ribbon (102 µm in thickness) are 950 and 1523 MPa, respectively, and its plastic elongation is 1.64%, indicating that remarkable strain-hardening occurs for the mixed phase alloy. The reason for the strain-hardening seems to originate from the strain-induced precipitations of B19′ in B2 phase and B2 and B19′ in Am matrix as well as at the Am/B2 interface. The highest hydrogen permeability for the Am alloy sheet of 32 μm in thickness was 7.00 × 10⁻⁹ mol m⁻¹ s⁻¹ Pa^−1/2 at 673 K, indicating that the hydrogen permeation amount in a unit time is comparable to that for the commercial Pd–Ag alloy sheet with a thickness of 100 μm. The knowledge that the HE Am and Am+B2 alloys exhibit good tensile mechanical properties with distinct strain-hardening caused by the strain-induced precipitation as well as rather good hydrogen permeation ability encourages the future practical use of HE Am and Am+B2 mixed phase alloys.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"62 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145141563","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":"Cooling-mediated N2 plasma engineering of facet-selective iron nitride frameworks for enhanced electrocatalysis","authors":"Bo Ouyang, Yuechuan Du, Jiankang Nie, Yaping Li, Zheng Zhang, Siyu Liu, Erjun Kan, Rajdeep Singh Rawat","doi":"10.1016/j.jmst.2025.06.059","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.06.059","url":null,"abstract":"In-situ plasma processing serves as a cost-effective strategy for modulating surface structure while simultaneously functionalizing material surface, owing to the low-contamination environment and its capability to induce strong surface-substrate interaction. However, current research primarily focuses on correlating plasma discharge parameters with the resultant surface morphology and facet orientation, often overlooking the dynamic evolution of critical parameters during plasma processing, particularly the surface thermal field. This leads to suboptimal surface structure modulation, thereby limiting the practical applicability of plasma-based surface engineering. Herein, we introduce a facile cooling-mediated N₂-plasma processing strategy to directly engineer iron nitride nano-framework on Fe surface, while concurrently modulating the surface facets. Operando plasma diagnostics, combined with numerical simulations, are employed to unravel the role of the surface-thermal field in governing the formation of catalytically favorable facets. Given the strong dependence of hydrogen evolution reaction (HER) behavior on surface structure, the resultant iron nitride frameworks via cooling-mediated plasma processing (cFeNC) exhibit improved catalytic performance compared to those fabricated through conventional thermally preserved plasma (hFeN). Density functional theory (DFT) calculations further confirm that the enhanced catalytic behaviors of cFeNC arise from the preferential exposure of highly reactive facets. Our strategy presents a cost-effective pathway for facet engineering of nitride surfaces, providing a promising route towards advanced electrocatalytic materials.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"28 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145141566","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":"Dislocation plasticity in porous micropillars under uniaxial loading","authors":"Phu Cuong Nguyen, Seungjoon Lee, Ill Ryu","doi":"10.1016/j.jmst.2025.08.058","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.08.058","url":null,"abstract":"A mesoscale computational plasticity model, which concurrently couples dislocation dynamics and the finite element method, has been developed to investigate fundamental deformation mechanisms and the corresponding mechanical response of single-crystalline aluminum porous micropillars. In this study, we explore the deformation mechanisms for incipient plasticity and the size-dependent strengthening properties in nanoporous metals under the complex loading conditions from the porous geometry. At a small scale where plastic deformation is governed by the operation of dislocation sources, the presence of nanovoids could even increase the flow stress by shortening the source length, which could also effectively hinder easy glide motion. Interestingly, nanoporous micropillars could achieve even higher strength than the bulk strength, as observed in recent experiments. In this regard, the flow stress shows clear dependence on not only macroscopic features of relative density, but also microscopic features such as the size and shape of the nanovoids. Our coupled model could provide unique opportunities for predicting macroscopic mechanical properties through the fundamental understanding of microscopic deformation mechanisms, showing good agreement with recent experimental results of nanoarchitecture materials.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"89 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145141564","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}