Pub Date : 2026-01-28DOI: 10.1016/j.actamat.2026.121972
Sang Yoon Song, Tae Jin Jang, Chang-Gi Lee, Dae Cheol Yang, Min Young Sung, Gunjick Lee, Jung Hun Han, Ju-Hyun Baek, Jin-Yoo Suh, Alireza Zargaran, Aparna Saksena, Baptiste Gault, Won-Seok Ko, Se-Ho Kim, Seok Su Sohn
{"title":"Reconciling ultrahigh strength and hydrogen embrittlement resistance via discontinuous L12 precipitation in a high-entropy alloy","authors":"Sang Yoon Song, Tae Jin Jang, Chang-Gi Lee, Dae Cheol Yang, Min Young Sung, Gunjick Lee, Jung Hun Han, Ju-Hyun Baek, Jin-Yoo Suh, Alireza Zargaran, Aparna Saksena, Baptiste Gault, Won-Seok Ko, Se-Ho Kim, Seok Su Sohn","doi":"10.1016/j.actamat.2026.121972","DOIUrl":"https://doi.org/10.1016/j.actamat.2026.121972","url":null,"abstract":"","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"279 1","pages":"121972"},"PeriodicalIF":9.4,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146072318","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}
Pub Date : 2026-01-28DOI: 10.1016/j.actamat.2026.121971
Hao He , Zhiyuan Chen , Wansen Ma , Qigang Chen , Qian Li , Xuewei Lv , Jie Dang
Seawater-electrolysis is a promising green method for hydrogen production, but the high corrosiveness of seawater and magnesium hydroxide precipitation during electrolysis quickly deactivate the cathode. Therefore, developing efficient and low-cost electrocatalysts remains a key challenge in this field. Herein, we develop a high-entropy alloy (CuCoCrRuMo HEA) catalyst for seawater electrolysis hydrogen production, simultaneously achieving the recovery of magnesium resources from seawater. The formation of MoO42− during the OER process effectively repels Cl−, mitigating catalyst corrosion. Additionally, the Cr2O3 enhances the corrosion resistance of the catalyst. The alloy also facilitates the deposition and recovery of Mg(OH)2 by repelling Mg2+, enabling efficient utilization of seawater resources. In 1 M KOH, the CuCoCrRuMo HEA exhibits overpotentials of 402 mV for HER and 450 mV for OER at the current density of 1000 mA cm−2. In 1 M KOH + 0.5 M NaCl (simulated seawater), the overpotentials decrease to 368 mV for HER and 430 mV for OER. Moreover, sustaining HER and OER performance for 1000 h at the same high current density in 1 M KOH + 0.5 M NaCl. These outstanding electrochemical performances highlight the potential of the CuCoCrRuMo HEA catalyst for efficient and stable seawater electrolysis and the comprehensive utilization of seawater resources.
海水电解是一种很有前途的绿色制氢方法，但电解过程中海水的高腐蚀性和氢氧化镁的沉淀会使阴极迅速失活。因此，开发高效、低成本的电催化剂仍然是该领域的关键挑战。本研究开发了一种用于海水电解制氢的高熵合金（cuccrrumo HEA）催化剂，同时实现了海水中镁资源的回收。在OER过程中形成的MoO42−有效地排斥Cl−，减轻了催化剂的腐蚀。此外，Cr2O3还增强了催化剂的耐腐蚀性。该合金还通过排斥Mg2+，促进了Mg(OH)2的沉积和回收，实现了海水资源的有效利用。在1 M KOH条件下，当电流密度为1000 mA cm−2时，CuCoCrRuMo HEA的HER过电位为402 mV， OER过电位为450 mV。在1 M KOH + 0.5 M NaCl（模拟海水）条件下，HER过电位降至368 mV， OER过电位降至430 mV。此外，在1 M KOH + 0.5 M NaCl中，在相同的高电流密度下，保持HER和OER性能1000小时。这些优异的电化学性能凸显了cuccrrumo HEA催化剂在高效稳定的海水电解和海水资源综合利用方面的潜力。
{"title":"CuCoCrRuMo HEA achieving Cl− repulsion and Mg resource recovery in industrial-current-density seawater electrolysis","authors":"Hao He , Zhiyuan Chen , Wansen Ma , Qigang Chen , Qian Li , Xuewei Lv , Jie Dang","doi":"10.1016/j.actamat.2026.121971","DOIUrl":"10.1016/j.actamat.2026.121971","url":null,"abstract":"<div><div>Seawater-electrolysis is a promising green method for hydrogen production, but the high corrosiveness of seawater and magnesium hydroxide precipitation during electrolysis quickly deactivate the cathode. Therefore, developing efficient and low-cost electrocatalysts remains a key challenge in this field. Herein, we develop a high-entropy alloy (CuCoCrRuMo HEA) catalyst for seawater electrolysis hydrogen production, simultaneously achieving the recovery of magnesium resources from seawater. The formation of MoO<sub>4</sub><sup>2−</sup> during the OER process effectively repels Cl<sup>−</sup>, mitigating catalyst corrosion. Additionally, the Cr<sub>2</sub>O<sub>3</sub> enhances the corrosion resistance of the catalyst. The alloy also facilitates the deposition and recovery of Mg(OH)<sub>2</sub> by repelling Mg<sup>2+</sup>, enabling efficient utilization of seawater resources. In 1 M KOH, the CuCoCrRuMo HEA exhibits overpotentials of 402 mV for HER and 450 mV for OER at the current density of 1000 mA cm<sup>−2</sup>. In 1 M KOH + 0.5 M NaCl (simulated seawater), the overpotentials decrease to 368 mV for HER and 430 mV for OER. Moreover, sustaining HER and OER performance for 1000 h at the same high current density in 1 M KOH + 0.5 M NaCl. These outstanding electrochemical performances highlight the potential of the CuCoCrRuMo HEA catalyst for efficient and stable seawater electrolysis and the comprehensive utilization of seawater resources.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"307 ","pages":"Article 121971"},"PeriodicalIF":9.3,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146071507","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}
Pub Date : 2026-01-26DOI: 10.1016/j.actamat.2026.121967
Yile Yang, Jing Shang, Jinbo Zhang, Pengfan Lv, Jiachen Li, Yiting Hui, Lei Zhang, Min Chen, Shaobin Zhang, Man Yu, Yongping Pu
The practical application in electronic devices of NaNbO3 (NN)-based ceramics by utilizing the antiferroelectric (AFE) behavior is highly limited by its phase instability and insufficient breakdown strength. Traditional approaches rely heavily on extensive experimental validation, and the fundamental mechanisms remain poorly understood. To address these challenges, density functional theory (DFT) calculations were performed in the present study to predict the effects of Sm doping at the A-site of NN on structural and energy variation. The calculated results indicate that Sm doping stabilizes the AFE-R phase by lowering its formation energy relative to the FE-Q and AFE-P phases, revealing a clear preference toward the AFE-R configuration. Guided by theoretical predictions, Na1-xSmxNbO3+δ ceramics were designed and synthesized in this study to verify the calculated results. Experimental results indicate that substitutional doping at the A-site could effectively help to stabilize the AFE-R phase. With the increasing doping concentration, the substitution effect of Sm3+ becomes more pronounced, leading to an enhanced relaxor behavior in the AFE-R phase and resulting in a slim P-E loop, consistent with the larger calculated ∆E values. Additionally, the SmNbO4 phase with low dielectric constant and high breakdown strength gradually precipitates at the grain boundaries, contributing to improved electrical performance of the ceramics. The potential mechanism of the improved breakdown strength and the energy storage performance were further revealed by electron paramagnetic resonance (EPR) and piezoresponse force microscopy (PFM) measurements. These results provide theoretical insights and experimental evidence for the development of lead-free ceramics with high-performance energy storage capabilities.
{"title":"Phase Transition of NaNbO3-Based Antiferroelectric Ceramics: Doping research based on DFT calculation","authors":"Yile Yang, Jing Shang, Jinbo Zhang, Pengfan Lv, Jiachen Li, Yiting Hui, Lei Zhang, Min Chen, Shaobin Zhang, Man Yu, Yongping Pu","doi":"10.1016/j.actamat.2026.121967","DOIUrl":"https://doi.org/10.1016/j.actamat.2026.121967","url":null,"abstract":"The practical application in electronic devices of NaNbO<ce:inf loc=\"post\">3</ce:inf> (NN)-based ceramics by utilizing the antiferroelectric (AFE) behavior is highly limited by its phase instability and insufficient breakdown strength. Traditional approaches rely heavily on extensive experimental validation, and the fundamental mechanisms remain poorly understood. To address these challenges, density functional theory (DFT) calculations were performed in the present study to predict the effects of Sm doping at the A-site of NN on structural and energy variation. The calculated results indicate that Sm doping stabilizes the AFE-R phase by lowering its formation energy relative to the FE-Q and AFE-P phases, revealing a clear preference toward the AFE-R configuration. Guided by theoretical predictions, Na<ce:inf loc=\"post\">1-</ce:inf><ce:italic><ce:inf loc=\"post\">x</ce:inf></ce:italic>Sm<ce:italic><ce:inf loc=\"post\">x</ce:inf></ce:italic>NbO<ce:inf loc=\"post\">3+δ</ce:inf> ceramics were designed and synthesized in this study to verify the calculated results. Experimental results indicate that substitutional doping at the A-site could effectively help to stabilize the AFE-R phase. With the increasing doping concentration, the substitution effect of Sm<ce:sup loc=\"post\">3+</ce:sup> becomes more pronounced, leading to an enhanced relaxor behavior in the AFE-R phase and resulting in a slim <ce:italic>P</ce:italic>-<ce:italic>E</ce:italic> loop, consistent with the larger calculated ∆<ce:italic>E</ce:italic> values. Additionally, the SmNbO<ce:inf loc=\"post\">4</ce:inf> phase with low dielectric constant and high breakdown strength gradually precipitates at the grain boundaries, contributing to improved electrical performance of the ceramics. The potential mechanism of the improved breakdown strength and the energy storage performance were further revealed by electron paramagnetic resonance (EPR) and piezoresponse force microscopy (PFM) measurements. These results provide theoretical insights and experimental evidence for the development of lead-free ceramics with high-performance energy storage capabilities.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"53 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2026-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146047857","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}
Pub Date : 2026-01-25DOI: 10.1016/j.actamat.2026.121966
Junhui Tang, Nicolas Jobit, Agata Sotniczuk, Witold Chromiński, Denis Laillé, Daniel Galy, Philippe Vermaut, Phillippe Castany, Thierry Gloriant, Ju Li, Frédéric Prima, Fan Sun
The present study focuses on the development of a novel Zr-12Nb-3Sn alloy displaying a body-centered tetragonal (BCT) / β dual-phase microstructure and engineered to achieve a superior combination of high strength and low elastic modulus. The BCT phase is shown to play a critical role in enhancing strength without increasing elastic modulus. Comprehensive analyses using in situ straining electron backscatter diffraction (EBSD) experiment and transmission electron microscopy (TEM) were conducted to characterize the microstructure of the BCT phase and the associated deformation mechanisms, including dislocation slip, stress-induced reversion from BCT to β transformation, and mechanical twinning. The present findings reveal that the BCT phase and mechanical twinning both contribute to material strengthening, whereas the stress-induced reversion of the BCT phase to β acts as a mechanism for stress relaxation. As a result, the alloy demonstrates exceptional mechanical performance, achieving a yield strength exceeding 1200 MPa, an elastic modulus of approximately 70 GPa, and an elongation of ∼13%.
{"title":"A dual-phase strain-transformable zirconium alloy with exceptional yield strength (1.2 GPa) and low elastic modulus (70 GPa) via TWIP and phase reversion","authors":"Junhui Tang, Nicolas Jobit, Agata Sotniczuk, Witold Chromiński, Denis Laillé, Daniel Galy, Philippe Vermaut, Phillippe Castany, Thierry Gloriant, Ju Li, Frédéric Prima, Fan Sun","doi":"10.1016/j.actamat.2026.121966","DOIUrl":"https://doi.org/10.1016/j.actamat.2026.121966","url":null,"abstract":"The present study focuses on the development of a novel Zr-12Nb-3Sn alloy displaying a body-centered tetragonal (BCT) / β dual-phase microstructure and engineered to achieve a superior combination of high strength and low elastic modulus. The BCT phase is shown to play a critical role in enhancing strength without increasing elastic modulus. Comprehensive analyses using <ce:italic>in situ</ce:italic> straining electron backscatter diffraction (EBSD) experiment and transmission electron microscopy (TEM) were conducted to characterize the microstructure of the BCT phase and the associated deformation mechanisms, including dislocation slip, stress-induced reversion from BCT to β transformation, and mechanical twinning. The present findings reveal that the BCT phase and mechanical twinning both contribute to material strengthening, whereas the stress-induced reversion of the BCT phase to β acts as a mechanism for stress relaxation. As a result, the alloy demonstrates exceptional mechanical performance, achieving a yield strength exceeding 1200 MPa, an elastic modulus of approximately 70 GPa, and an elongation of ∼13%.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"58 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2026-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146047861","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}
Pub Date : 2026-01-25DOI: 10.1016/j.actamat.2026.121965
X. Zhang , C.D. Woodgate , G. Hadjipanayis , J.B. Staunton , L.H. Lewis
Combined experimental and computational investigations of the CuNiFe spinodal system confirm that application of a mild magnetic field during thermal treatment alters elemental redistribution and the resulting microstructure, relative to that obtained from zero-field annealing. Spinodal decomposition of a Cu40Ni42Fe18 alloy was initiated during thermal treatment at 773 K, conducted either under zero field or modest (60 mT) magnetic field conditions for up to 200 h. Periodic (∼10 nm) chemical modulations into Cu-rich and NiFe-rich regions were observed under both conditions, with the amplitude and wavelength of the segregated regions increasing with treatment time. However, magnetic field annealing resulted in a more than twofold increase in the amplitude of elemental modulations relative to zero-field conditions – consistent with enhanced diffusional fluxes during spinodal decomposition – while the modulation wavelength remained largely unaffected. These microstructural differences are reflected in various extrinsic magnetic properties. In parallel, first-principles DFT calculations indicate that long-range ferromagnetic order, as induced by an applied magnetic field, substantially alters the strength and nature of atomic interactions, enhancing the thermodynamic instability of the CuNiFe solid solution. Collectively, these results suggest that incorporating a mild (millitesla-level) magnetic field – distinct from the strong (tesla-level) fields commonly used in prior studies – during thermal processing has the potential to deliver enhanced control of microstructures for targeted engineering outcomes.
{"title":"Tailoring microstructures with mild magnetic-field processing: A case study of CuNiFe alloys","authors":"X. Zhang , C.D. Woodgate , G. Hadjipanayis , J.B. Staunton , L.H. Lewis","doi":"10.1016/j.actamat.2026.121965","DOIUrl":"10.1016/j.actamat.2026.121965","url":null,"abstract":"<div><div>Combined experimental and computational investigations of the CuNiFe spinodal system confirm that application of a mild magnetic field during thermal treatment alters elemental redistribution and the resulting microstructure, relative to that obtained from zero-field annealing. Spinodal decomposition of a Cu<sub>40</sub>Ni<sub>42</sub>Fe<sub>18</sub> alloy was initiated during thermal treatment at 773 K, conducted either under zero field or modest (60 mT) magnetic field conditions for up to 200 h. Periodic (∼10 nm) chemical modulations into Cu-rich and NiFe-rich regions were observed under both conditions, with the amplitude and wavelength of the segregated regions increasing with treatment time. However, magnetic field annealing resulted in a more than twofold increase in the amplitude of elemental modulations relative to zero-field conditions – consistent with enhanced diffusional fluxes during spinodal decomposition – while the modulation wavelength remained largely unaffected. These microstructural differences are reflected in various extrinsic magnetic properties. In parallel, first-principles DFT calculations indicate that long-range ferromagnetic order, as induced by an applied magnetic field, substantially alters the strength and nature of atomic interactions, enhancing the thermodynamic instability of the CuNiFe solid solution. Collectively, these results suggest that incorporating a mild (millitesla-level) magnetic field – distinct from the strong (tesla-level) fields commonly used in prior studies – during thermal processing has the potential to deliver enhanced control of microstructures for targeted engineering outcomes.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"307 ","pages":"Article 121965"},"PeriodicalIF":9.3,"publicationDate":"2026-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146047862","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}
Pub Date : 2026-01-24DOI: 10.1016/j.actamat.2026.121964
Sourav Mandal, Tapan Kumar Nath
Harmful organic chemical substances require liquefaction or solidification for safe handling, but their high boiling points present significant challenges. Liquefaction of H₂ gas using the magnetocaloric response (MCR) near its boiling point has been proposed, highlighting the need for effective magnetic refrigerants at similar temperatures. This study introduces a potential refrigerant: a 52.4 nm thin film of half-metallic ferromagnetic (HMF) Full-Heusler alloy Fe2CrSi, deposited on a single-crystalline p-type Si <100> wafer via electron-beam physical vapor deposition (EBPVD), aimed at enabling the safe handling of such substances. The thin film exhibits a continuous ‘ferromagnetic-to-paramagnetic phase transition’ above the ‘Curie temperature’ (θCW = + 607.828 K), a ‘second-order magnetic phase transition’ (SOMPT). This HMF film possesses adequate significance for refrigeration and spintronics applications for high ‘relative cooling power’ (‘RCP’) of 380.85 mJ.cm-3 (equivalent to 57.01 J.Kg-1) at a 20 kOe field change; large ‘operating temperature range’ of 78.18 K; low constituent cost; non-toxic elements; zero thermal hysteresis; and high Curie temperature, respectively. The ‘spontaneous magnetization value close to 0 K’, Ms(0), is determined to be 56.868 emu/g (∼ 1.953 µB/f.u.) by extrapolating the Arrott plot to the H/M = 0 axis. It is consistent with the ‘Slater-Pauling (S-P) rule’. Additionally, using Critical Isotherms (CI), ‘Rusbrooke equality’ and ‘Widom-scaling relation’, the most feasible values of its ‘critical exponents’ (α ≈ -1.144, β ≈ 0.735, γ ≈ 1.674 and δ ≈ 3.278), across the film’s SOMPT, are predicted.
{"title":"Fe2CrSi thin film as magnetocaloric refrigerant to liquefy/solidify high-boiling-point harmful organic substances and its associated critical phenomena","authors":"Sourav Mandal, Tapan Kumar Nath","doi":"10.1016/j.actamat.2026.121964","DOIUrl":"https://doi.org/10.1016/j.actamat.2026.121964","url":null,"abstract":"Harmful organic chemical substances require liquefaction or solidification for safe handling, but their high boiling points present significant challenges. Liquefaction of H₂ gas using the magnetocaloric response (<ce:italic>MCR</ce:italic>) near its boiling point has been proposed, highlighting the need for effective magnetic refrigerants at similar temperatures. This study introduces a potential refrigerant: a 52.4 nm thin film of half-metallic ferromagnetic (<ce:italic>HMF</ce:italic>) Full-Heusler alloy Fe<ce:inf loc=\"post\">2</ce:inf>CrSi, deposited on a single-crystalline p-type Si <100> wafer via electron-beam physical vapor deposition (<ce:italic>EBPVD</ce:italic>), aimed at enabling the safe handling of such substances. The thin film exhibits a continuous ‘ferromagnetic-to-paramagnetic phase transition’ above the ‘Curie temperature’ (<mml:math altimg=\"si2.svg\"><mml:msub><mml:mi>θ</mml:mi><mml:mrow><mml:mi>C</mml:mi><mml:mi>W</mml:mi></mml:mrow></mml:msub></mml:math> = + 607.828 K), a ‘second-order magnetic phase transition’ (<ce:italic>SOMPT</ce:italic>). This <ce:italic>HMF</ce:italic> film possesses adequate significance for refrigeration and spintronics applications for high ‘relative cooling power’ (‘<ce:italic>RCP</ce:italic>’) of 380.85 mJ.cm<ce:sup loc=\"post\">-3</ce:sup> (equivalent to 57.01 J.Kg<ce:sup loc=\"post\">-1</ce:sup>) at a 20 kOe field change; large ‘operating temperature range’ of 78.18 K; low constituent cost; non-toxic elements; zero thermal hysteresis; and high Curie temperature, respectively. The ‘spontaneous magnetization value close to 0 K’, <ce:italic>M<ce:inf loc=\"post\">s</ce:inf>(0)</ce:italic>, is determined to be 56.868 emu/g (∼ 1.953 <ce:italic>µ<ce:inf loc=\"post\">B</ce:inf>/f.u</ce:italic>.) by extrapolating the Arrott plot to the <ce:italic>H/M</ce:italic> = 0 axis. It is consistent with the ‘Slater-Pauling (<ce:italic>S-P</ce:italic>) rule’. Additionally, using Critical Isotherms (<ce:italic>CI</ce:italic>), ‘Rusbrooke equality’ and ‘Widom-scaling relation’, the most feasible values of its ‘critical exponents’ (<ce:italic>α</ce:italic> ≈ -1.144, <ce:italic>β</ce:italic> ≈ 0.735, <ce:italic>γ</ce:italic> ≈ 1.674 and <ce:italic>δ</ce:italic> ≈ 3.278), across the film’s <ce:italic>SOMPT</ce:italic>, are predicted.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"45 2 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2026-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146047863","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}
Pub Date : 2026-01-24DOI: 10.1016/j.actamat.2026.121959
Dmitri V. Alexandrov, Irina E. Koroznikova, Alexandra E. Glebova, Liubov V. Toropova
Based on a number of experiments carried out in microgravity and terrestrial conditions, we demonstrate that the shape of ice dendrite tips sufficiently differs from an elliptical paraboloid. To describe the stable growth mode of such crystals, we apply Geometrically Morphological Theory (Acta Mater. 296 (2025), 121232), Boundary Integral Method (Physica A 469 (2017), 420) and Selection Criterion (Phys. Rep. 1085 (2024) 1). This enables us to theoretically obtain the dendrite tip velocity <span><span style=""></span><span data-mathml='<math xmlns="http://www.w3.org/1998/Math/MathML"><mi is="true">V</mi></math>' role="presentation" style="font-size: 90%; display: inline-block; position: relative;" tabindex="0"><svg aria-hidden="true" focusable="false" height="1.971ex" role="img" style="vertical-align: -0.235ex;" viewbox="0 -747.2 769.5 848.5" width="1.787ex" 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"><use xlink:href="#MJMATHI-56"></use></g></g></svg><span role="presentation"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi is="true">V</mi></math></span></span><script type="math/mml"><math><mi is="true">V</mi></math></script></span> and tip radius <span><span style=""></span><span data-mathml='<math xmlns="http://www.w3.org/1998/Math/MathML"><msub is="true"><mrow is="true"><mi is="true">R</mi></mrow><mrow is="true"><mn is="true">1</mn></mrow></msub></math>' role="presentation" style="font-size: 90%; display: inline-block; position: relative;" tabindex="0"><svg aria-hidden="true" focusable="false" height="2.317ex" role="img" style="vertical-align: -0.582ex;" viewbox="0 -747.2 1213.4 997.6" width="2.818ex" 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"><g is="true"><use xlink:href="#MJMATHI-52"></use></g></g><g is="true" transform="translate(759,-150)"><g is="true"><use transform="scale(0.707)" xlink:href="#MJMAIN-31"></use></g></g></g></g></svg><span role="presentation"><math xmlns="http://www.w3.org/1998/Math/MathML"><msub is="true"><mrow is="true"><mi is="true">R</mi></mrow><mrow is="true"><mn is="true">1</mn></mrow></msub></math></span></span><script type="math/mml"><math><msub is="true"><mrow is="true"><mi is="true">R</mi></mrow><mrow is="true"><mn is="true">1</mn></mrow></msub></math></script></span> in the basal plane during the same experiment as the functions of liquid undercooling. Analyzing all available experimental data on the measurements of <span><span style=""></span><span data-mathml='<math xmlns="http://www.w3.org/1998/Math/MathML"><mi is="true">V</mi></math>' role="presentation" style="font-size: 90%; display: inline-block; position: relative;" tabindex="0"><svg aria-hidden="true" focusabl
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