Journal of Materials Science & Technology最新文献

{"title":"Synergistic enhancement of actuation performance through crystallographic texturing and configuration optimization","authors":"Yue Zhang, Yuan Sun, Linjing Liu, Jie Wu, Jinpeng Ma, Hongjun Zhang, Yulin Yang, Siyuan Yu, Bin Yang","doi":"10.1016/j.jmst.2026.08.104","DOIUrl":"https://doi.org/10.1016/j.jmst.2026.08.104","url":null,"abstract":"Piezoelectric actuators must simultaneously achieve large stroke, good linearity, and high precision. Piezoelectric property enhancement plays a critical role in improving actuation performance. In this study, [001]<ce:inf loc=\"post\">c</ce:inf> textured 0.73Pb(Mg<ce:inf loc=\"post\">1/3</ce:inf>Nb<ce:inf loc=\"post\">2/3</ce:inf>)O<ce:inf loc=\"post\">3</ce:inf>-0.27PbTiO<ce:inf loc=\"post\">3</ce:inf>-Gd<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">3</ce:inf> (PMN-PT-Gd) ceramics with <ce:italic>F</ce:italic><ce:inf loc=\"post\">001</ce:inf>=98% were fabricated via the templated grain growth method. The textured ceramics exhibit excellent piezoelectric properties, including <ce:italic>d</ce:italic><ce:inf loc=\"post\">33</ce:inf>=1300 pC/N, <ce:italic>d</ce:italic><ce:inf loc=\"post\">31</ce:inf>=−417 pC/N, <ce:italic>k</ce:italic><ce:inf loc=\"post\">31</ce:inf>=45%, <ce:italic>k</ce:italic><ce:inf loc=\"post\">p</ce:inf>=70%, <ce:italic>d</ce:italic><ce:inf loc=\"post\">33</ce:inf>*=1460 pm/V, and a low <ce:italic>H</ce:italic><ce:inf loc=\"post\">s</ce:inf>=5.6% under 20 kV/cm. Finite element analysis demonstrated that a square-tube configuration actuator yielded a significant increase in the output displacement, compared with that of the conventional cylindrical-tube structure, along with a more uniform stress distribution and lower energy dissipation. The actuator achieves remarkable performance improvement through the synergistic effect of enhanced piezoelectric properties and configuration optimization. The piezoelectric scanners based on textured PMN-PT-Gd ceramics exhibited an emitted spot displacement range 83.2% larger than that of the PZT-5H based counterparts, and also showed excellent linearity with respect to the driving voltage. These results demonstrate that the textured piezoceramic scanner with a square-tube configuration features strong potential for application in high-precision laser-modulation systems and miniature insertable medical endoscopes.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"124 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2026-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149084983","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":"Topologically crosslinked molecular intercalation enabling strain-resilient EMI shielding in an n-type conducting polymer","authors":"Xuefei Si, Yutong Liu, Shuaishuai Cheng, Jiaheng Bi, Chaobo Liang","doi":"10.1016/j.jmst.2026.09.029","DOIUrl":"https://doi.org/10.1016/j.jmst.2026.09.029","url":null,"abstract":"Maintaining stable electromagnetic interference (EMI) shielding performance under large deformation remains a major challenge. The n-type conducting polymer poly(benzodifurandione) (PBFDO) exhibits excellent electrical conductivity. However, strong π-π interactions lead to severe intrinsic brittleness. The incorporation of flexible polymers can alleviate brittleness, yet the resulting improvement in deformability is still limited. This work, by grafting 3-isocyanatopropyltriethoxysilane (IPTS) onto both ends of polyethylene glycol (PEG) to synthesize a flexible, both-end IPTS-grafted PEG (BIP), proposes a strategy based on molecular-level intercalation and dense hydrogen-bonding interactions. BIP is intercalated into the interlayers of PBFDO, increasing the free volume of the system and forming a high-density hydrogen-bonding network with PBFDO. The resulting increase in deformation freedom enables the composite film to achieve an elongation at break of 580%. Under strains of 100% and 500%, the EMI shielding effectiveness retention of the composite film reaches 93% and 65%, respectively. Moreover, a fully connected neural network is constructed to predict EMI shielding performance, achieving an external-validation root mean square error of 2.429. This work provides an effective strategy for alleviating the brittleness of n-type conducting polymers and achieving stable EMI shielding performance under large deformation, demonstrating great application potential in flexible electronics.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"464 1","pages":"248-256"},"PeriodicalIF":10.9,"publicationDate":"2026-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149084788","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":"Defect dipole engineering induced by Cobalt(II) doping enables ultralow dielectric loss in Zn2SiO4 ceramics","authors":"Xintong Song, Renfei Cheng, Jigong Hao, Hui Zhang, Yan Liang, Yating He, Tao Hu, Xiaohui Wang","doi":"10.1016/j.jmst.2026.09.031","DOIUrl":"https://doi.org/10.1016/j.jmst.2026.09.031","url":null,"abstract":"Tunnel-structured zinc orthosilicate (Zn<ce:inf loc=\"post\">2</ce:inf>SiO<ce:inf loc=\"post\">4</ce:inf>) is a promising low-loss dielectric ceramic, yet further suppression of dielectric dissipation requires effective regulation of its local defect structure. Herein, pristine Zn<ce:inf loc=\"post\">2</ce:inf>SiO<ce:inf loc=\"post\">4</ce:inf> and Ni<ce:sup loc=\"post\">2+</ce:sup>, Co<ce:sup loc=\"post\">2+</ce:sup>, and Mn<ce:sup loc=\"post\">2+</ce:sup> singly doped ceramics are prepared from chemically homogeneous precursors obtained by solvent evaporation. This synthesis route promotes uniform transition-metal incorporation at Zn lattice sites and enables controlled perturbation of the tetrahedral framework. Although Ni, Co, and Mn substitution all induce lattice distortion and defect formation, their dielectric effects are markedly different. In contrast to Ni and Mn, which introduce additional relaxation loss, Co selectively lowers dielectric dissipation. The Co-doped ceramic exhibits an ultralow tan<ce:italic>δ</ce:italic> of 7.3 × 10<ce:sup loc=\"post\">−5</ce:sup> at 1 MHz with an <ce:italic>ε</ce:italic><ce:inf loc=\"post\">r</ce:inf> of 9.2 at room temperature, nearly one order of magnitude lower than that of pristine Zn<ce:inf loc=\"post\">2</ce:inf>SiO<ce:inf loc=\"post\">4</ce:inf>. Electron paramagnetic resonance, X-ray photoelectron spectroscopy, and density functional theory calculations suggest that tetrahedrally coordinated Co<ce:sup loc=\"post\">2+</ce:sup> may enhance localized electron trapping and stabilize oxygen-vacancy-related defect complexes. These localized defect centers may suppress long-range carrier migration and weaken Maxwell-Wagner interfacial polarization, thereby reducing dielectric loss while maintaining a relatively high dielectric constant. This work establishes dopant-stabilized defect localization as an effective strategy for designing ultralow-loss silicate dielectric ceramics.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"77 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2026-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149084786","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":"Deformable Ti particles regulating strain partitioning and microstructural evolution in a high-yield-strength Mg-Gd-Y-Zn composite","authors":"Daiyi Deng, Jianbo Li, Yitao Wang, Jianwei Chen, Bo Liu, Zhouhang Feng, Yu Zhang, Zhanyuan Dong, Xianhua Chen, Fusheng Pan","doi":"10.1016/j.jmst.2026.09.030","DOIUrl":"https://doi.org/10.1016/j.jmst.2026.09.030","url":null,"abstract":"A Ti-particle-reinforced Mg-9Gd-4Y-1Zn-0.5Mn (Ti/VW94) composite with excellent yield strength was fabricated via near-recrystallization warm extrusion at 340°C followed by aging treatment. During warm extrusion, trace Mn atoms dynamically segregated toward the Ti/Mg interfaces, leading to the in-situ formation of a low-mismatch interface layer of MnTi intermetallic compound. This robust metallurgical bonding facilitated coordinated elastoplastic co-deformation between the Ti particles and the Mg matrix, thereby effectively governing local strain partitioning within the composite. Meanwhile, the coarse deformed undynamic recrystallization (unDRX) grains retained extremely high stored strain energy and dense dislocation structures, while the dual-source particle-stimulated nucleation mechanism induced by Ti particles and intrinsic long-period stacking ordered (LPSO) phases promoted the formation of ultrafine DRX grains (∼350 nm). After aging, nanoscale β′ precipitates and lamellar LPSO phases preferentially formed in high-defect-density unDRX grains, while β phases preferentially formed along solute-rich DRX grain boundaries. These precipitates constructed a hierarchical multi-scale obstacle network that effectively impeded dislocation motion. Owing to the combined effects of grain refinement, dislocation strengthening, precipitation strengthening, and load transfer, the composite achieved a high yield strength of 535 MPa and an ultimate tensile strength of 549 MPa. These findings demonstrate that deformable metallic reinforcements can fundamentally regulate strain partitioning and thereby govern recrystallization pathways, dislocation density, and precipitation behavior in Mg-rare earth-Zn alloys, providing a new strategy for designing high-strength magnesium matrix composites.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"99 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2026-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149084773","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":"Polyvinyl alcohol/gelatin/carboxymethyl chitosan hydrogels with improved mechanical strength and fatigue resistance for artificial heart valves","authors":"Yuhe Wang, Qiang Yu, Zeping Zhang, Rizheng Han, Jingtong Li, Guixue Wang, Rui Yang, Yun Bai, Xing Zhang","doi":"10.1016/j.jmst.2026.08.100","DOIUrl":"https://doi.org/10.1016/j.jmst.2026.08.100","url":null,"abstract":"Hydrogels are promising materials for heart valve tissue engineering; however, their translation into medical devices remains limited by post-processing steps that can introduce defects and weaken mechanical performance. Recent advances in mechanically robust hydrogels with nanoscale fibrous architectures have renewed interest in post-processing strategies for hydrogel devices. Here, polyvinyl alcohol/gelatin/carboxymethyl chitosan hydrogels (PVA/gelatin/CMCS, denoted as PGC) were fabricated by directional freeze-casting and further reinforced by Fe<ce:sup loc=\"post\">3+</ce:sup> cross-linking and heat treatment to obtain aPGC/Fe hydrogels. The resulting aPGC/Fe hydrogels exhibited an elastic modulus of up to 8.16 MPa, toughness of 6.45 MJ m<ce:sup loc=\"post\">−3</ce:sup>, and a fatigue threshold of 275.31 J m<ce:sup loc=\"post\">−2</ce:sup>, close to those of native heart valve leaflets. The aPGC/Fe hydrogels showed good hemocompatibility and cytocompatibility. Furthermore, interlayer assembly was employed to mimic the native trilayer architecture of human heart valve leaflets, while microgrooves were patterned on the hydrogel surfaces to regulate near-wall fluid behavior. Artificial heart valves fabricated from the post-processed aPGC/Fe hydrogels reproduced physiologic hydrodynamic performance with effective orifice area (EOA) and regurgitant fraction (RF) values satisfying the requirements of the ISO 5840-2 standard. Collectively, these results establish a reinforcement and post-processing strategy for translating fibrous hydrogels into biomedical devices.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"9 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2026-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149084787","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":"Role of deformation heterogeneity in the superplasticity of Ti6321 titanium alloy with a bimodal microstructure","authors":"Wei Fan, Xiaofei Wu, Xiaoyu Zhu, Huiping Wu, Dayong An, Xifeng Li","doi":"10.1016/j.jmst.2026.09.025","DOIUrl":"https://doi.org/10.1016/j.jmst.2026.09.025","url":null,"abstract":"Superplastic forming offers a promising approach for producing critical ultra-thick titanium alloy components for marine applications. Near-α Ti6321 titanium alloy with a bimodal microstructure provides excellent mechanical performance and is therefore widely used in marine engineering. However, the influence of microstructural heterogeneity on its superplastic behavior and the underlying deformation mechanisms remains insufficiently understood. In this work, interrupted high-temperature tensile tests combined with systematic microstructural characterization were performed. The results reveal that deformation is accommodated by distinct yet coupled mechanisms in equiaxed α and lamellar α regions. In equiaxed α, plastic flow is predominantly governed by strong dynamic recovery and continuous dynamic recrystallization (DRX), with discontinuous DRX activated at intermediate strains. In contrast, lamellar α undergoes pronounced strain- and orientation-dependent dynamic globularization and more extensive DRX, particularly in Type II/III colonies. A distinct DRX mechanism, epitaxial recrystallization, is identified in lamellar α at low strains, where newly formed α grains preserve the local Burgers orientation relationship with adjacent β and form semi-coherent, low-misfit α/β interfaces. Two-beam TEM observations reveal extensive &lt;<ce:italic>a</ce:italic>&gt; and &lt;<ce:italic>c</ce:italic>+<ce:italic>a</ce:italic>&gt; dislocation activity, consistent with the in-grain misorientation axes results showing that the preferred Taylor axes progressively shift from &lt;0001&gt; toward &lt;<mml:math altimg=\"si15.svg\"><mml:mrow><mml:mn>0</mml:mn><mml:mover accent=\"true\"><mml:mn>1</mml:mn><mml:mo>¯</mml:mo></mml:mover><mml:mn>12</mml:mn></mml:mrow></mml:math>&gt; and &lt;<mml:math altimg=\"si19.svg\"><mml:mrow><mml:mi>u</mml:mi><mml:mi>v</mml:mi><mml:mi>t</mml:mi><mml:mn>0</mml:mn></mml:mrow></mml:math>&gt; with increasing strain. The co-activation of multiple slip variants gradually alters the local misorientation axes away from those established by preceding slip, thereby modifying local grain orientations through slip-induced lattice rotation and promoting increasingly dispersed slip activity. The synergistic interplay of heterogeneous slip and multiple DRX mechanisms promotes the transformation of hard-slip-dominated lamellar α into a fine-grained equiaxed microstructure. This microstructural homogenization facilitates multidirectional soft slip and grain boundary sliding, thereby underpinning the superior superplastic response of the alloy.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"14 1","pages":"164-175"},"PeriodicalIF":10.9,"publicationDate":"2026-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149084985","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":"Phase-stability engineering of oxide scales in multicomponent (Hf,Zr,Sc)B2 coatings for durable cyclic ablation resistance","authors":"Junshuai Lv, Wei Li, Zhenglong Li, Lingxiang Guo, Junhao Zhao, Yixin Li, Jiachen Li, Tao Li, Yanqin Fu, Jian Zhang, Yulei Zhang, Hejun Li","doi":"10.1016/j.jmst.2026.08.102","DOIUrl":"https://doi.org/10.1016/j.jmst.2026.08.102","url":null,"abstract":"The growing demand for reusable thermal protection systems calls for ceramic coatings that can retain protective oxide scales under repeated ultra-high-temperature ablation. However, conventional ultra-high-temperature ceramic (UHTC) coatings often fail under thermal cycling because their HfO<ce:inf loc=\"post\">2</ce:inf>/ZrO<ce:inf loc=\"post\">2</ce:inf>-dominated oxide scales suffer phase-transformation-induced cracking and delamination. Here, we address this limitation by incorporating Sc into multicomponent (Hf,Zr,Sc)B<ce:inf loc=\"post\">2</ce:inf> solid-solution coatings to engineer oxide-scale phase stability. The optimized coating containing 10 mol% Sc maintains scale integrity after 6 × 120 s exposures at temperatures above 2300°C and exhibits a negative linear recession rate of −0.11 μm s<ce:sup loc=\"post\">−1</ce:sup>. Multiscale characterization of the resulting oxide scale reveals partial tetragonal-to-monoclinic martensitic transformation within parent tetragonal grains, producing monoclinic laths while retaining Sc-stabilized metastable tetragonal domains and thereby limiting the overall transformation-induced volumetric strain. These tetragonal domains are preferentially retained at grain boundaries and triple junctions along intergranular crack paths, a spatial distribution consistent with transformation-associated crack tolerance. These findings establish phase-stability engineering of oxide scales as an effective strategy for maintaining scale integrity and protecting high-temperature structural materials under repeated extreme thermal exposure.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"34 1","pages":"176-184"},"PeriodicalIF":10.9,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149084688","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":"High-entropy ferrite with ultrafine heterostructured nanoclusters for broadband and intelligent switchable microwave absorption","authors":"Yiman Lu, Ruobing Cao, Xiaoning Zhao, Ya Lin, Ye Tao, Zhongqiang Wang, Haiyang Xu, Yichun Liu","doi":"10.1016/j.jmst.2026.09.026","DOIUrl":"https://doi.org/10.1016/j.jmst.2026.09.026","url":null,"abstract":"High-entropy (HE) ferrites with multi-element substitution emerge as promising candidates for microwave absorption (MA) due to their adjustable structure and unique HE effects. However, the effective absorption bandwidth (EAB) and the absorption strength of conventional kinetically random-mixing single-phase HE ferrites are limited. Herein, we report the synthesis of HE ferrite with the formation of ultrafine nanoclusters within the matrix anchored on carbon aerogel (CA) through rapid microwave heating. Benefiting from the binary formation energy differences among the constituent elements (Fe, Co, Ni, Cu, Mn, Ce, O), CeO<ce:inf loc=\"post\">2</ce:inf> nanoclusters are formed within the HE ferrite matrix. The CeO<ce:inf loc=\"post\">2</ce:inf>/HE ferrite-decorated CA (CH/CA) exhibits polarization-enhanced electromagnetic attenuation, which substantially widens the EAB. At 4.0 mm thickness, CH/CA achieves a minimum reflection loss of −69.14 dB at 5.21 GHz, with EAB covering 92.9% of C-band. Notably, the EAB reaches 8.94 GHz at a thickness of 2.5 mm, covering 89.4% of the combined X- and Ku-bands. The integrated EAB of CH/CA at a thickness ranging from 1.5 to 5.0 mm reaches 14.82 GHz, which is comparable to the reported highest values. Furthermore, the CH/CA exhibits compressive strain-driven intelligent on/off switchable and frequency-tunable MA performance. This work proposes a phase-separated HE composite for broadband and smart MA applications.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"6 1","pages":"124-132"},"PeriodicalIF":10.9,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149084673","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":"Rotational twinning endows B2 multi-principal element intermetallic alloys with excellent strength and ductility","authors":"Zhengao Wang, Qihua Wang, Tingmei Wang, Rui Yang","doi":"10.1016/j.jmst.2026.08.099","DOIUrl":"https://doi.org/10.1016/j.jmst.2026.08.099","url":null,"abstract":"The synergistic enhancement of strength and ductility remains a critical challenge for B2 intermetallic alloys due to their intrinsic room-temperature brittleness. Herein, using the Ni–Ti system with its highly tunable composition and sensitive phase stability as an ideal model, we designed Ni<ce:inf loc=\"post\">50</ce:inf>Ti<ce:inf loc=\"post\">16.7</ce:inf>Zr<ce:inf loc=\"post\">16.7</ce:inf>Hf<ce:inf loc=\"post\">16.6</ce:inf> and Ni<ce:inf loc=\"post\">25</ce:inf>Co<ce:inf loc=\"post\">25</ce:inf>Ti<ce:inf loc=\"post\">16.7</ce:inf>Zr<ce:inf loc=\"post\">16.7</ce:inf>Hf<ce:inf loc=\"post\">16.6</ce:inf> alloys via a multi-principal element approach. Multiscale characterization and first-principles calculations show that the Co-free alloy adopts a brittle B19′ martensitic structure at room temperature, with a fracture strain of ∼13%. In contrast, Co-doping induces changes in the structural ground state, which facilitates the stabilization of the monolithic B2 phase. The Ni<ce:inf loc=\"post\">25</ce:inf>Co<ce:inf loc=\"post\">25</ce:inf>Ti<ce:inf loc=\"post\">16.7</ce:inf>Zr<ce:inf loc=\"post\">16.7</ce:inf>Hf<ce:inf loc=\"post\">16.6</ce:inf> alloy shows an exceptional combination of strength and ductility, with a yield strength of 1527 MPa, an ultimate compressive strength of 3099 MPa, and a compressive strain of ∼40%. This distinctive feature stems from a deformation mechanism in which &lt;110&gt;-oriented rotational twinning mediates strain accommodation, maintains long-range structural order, and facilitates screw dislocations cross-slip. This twinning-induced plasticity within ordered structures provides a generalizable pathway for designing high-performance B2 intermetallic alloys.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"558 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2026-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149084672","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":"Regulating Fe3O4-to-FeO ratio by Co3O4 pre-deposition to enhance oxidation resistance of pure iron","authors":"Teng Fu, Linhan Xu, Wen Wang, Dongyang Zhao, Yechun Xin, Bo Zhang","doi":"10.1016/j.jmst.2026.08.092","DOIUrl":"https://doi.org/10.1016/j.jmst.2026.08.092","url":null,"abstract":"Oxidation of iron-based alloys above 600°C produces a Fe<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">3</ce:inf>/Fe<ce:inf loc=\"post\">3</ce:inf>O<ce:inf loc=\"post\">4</ce:inf>/FeO trilayer scale, in which the porous, rapidly growing FeO layer is detrimental, whereas Fe<ce:inf loc=\"post\">3</ce:inf>O<ce:inf loc=\"post\">4</ce:inf> is desirable owing to its high compactness and lower growth rate. Yet the vastly different growth kinetics of the two oxides make FeO suppression challenging. Here, we demonstrate that pre-depositing a layer of Co<ce:inf loc=\"post\">3</ce:inf>O<ce:inf loc=\"post\">4</ce:inf> nanoparticles on pure iron can effectively regulate the growth kinetics and structure of the oxide scale at 700°C, reducing the oxidation rate constant by one order of magnitude and increasing the Fe<ce:inf loc=\"post\">3</ce:inf>O<ce:inf loc=\"post\">4</ce:inf>/FeO thickness ratio from 0.06 to 1.36. Density functional theory calculations reveal that these changes originate from Co<ce:sup loc=\"post\">2+</ce:sup> doping, which increases the diffusion barrier for cation vacancies while lowering that for anion vacancies in both Fe<ce:inf loc=\"post\">3</ce:inf>O<ce:inf loc=\"post\">4</ce:inf> and FeO. As a result, FeO growth is strongly suppressed, and Fe<ce:inf loc=\"post\">3</ce:inf>O<ce:inf loc=\"post\">4</ce:inf> growth shifts toward inward O<ce:sup loc=\"post\">2−</ce:sup> diffusion, promoting competitive growth at the Fe<ce:inf loc=\"post\">3</ce:inf>O<ce:inf loc=\"post\">4</ce:inf>/FeO interface and further hindering FeO thickening. This work provides theoretical guidance for rational regulation of oxide-scale phase structure and oxidation-protection strategies in iron.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"58 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2026-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148984732","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}