Pub Date : 2026-01-24DOI: 10.1016/j.scriptamat.2026.117189
Yuhe Huang , Haibo Feng , Jun Lu , Junheng Gao , Haitao Zhao , Chaolei Zhang , Honghui Wu , Shuize Wang , Xinping Mao
The {332} body-centered cubic (bcc) deformation twinning mode is crucial for the mechanical performance of metastable bcc Ti alloys, yet its migration and growth mechanism remains unclear. Here, in situ tensile transmission electron microscopy was employed to directly observe {332} twin boundary migration in a Ti–12Mo alloy. Transient α’’ martensite was found at migrating twin boundaries. Lattice correspondence and Schmid factor analyses show that the activated α’’ martensite occurs as single crystallographic variant in the {332} twin and the bcc matrix, indicating that the migration of the {332} twin boundary is not governed by α’’ twinning-assisted mechanisms. Instead, α’’ acts as an interfacial accommodation structure facilitating twin boundary migration. These findings provide direct mechanistic insight into the role of α’’ martensite during {332} twin boundary migration in metastable bcc Ti alloys, demonstrating that the {332} twin migration proceeds via martensite-assisted interfacial accommodation rather than through the martensitic twinning mechanism.
{"title":"In-situ investigation of {332} twin boundary migration in metastable bcc titanium alloys","authors":"Yuhe Huang , Haibo Feng , Jun Lu , Junheng Gao , Haitao Zhao , Chaolei Zhang , Honghui Wu , Shuize Wang , Xinping Mao","doi":"10.1016/j.scriptamat.2026.117189","DOIUrl":"10.1016/j.scriptamat.2026.117189","url":null,"abstract":"<div><div>The {332} body-centered cubic (bcc) deformation twinning mode is crucial for the mechanical performance of metastable bcc Ti alloys, yet its migration and growth mechanism remains unclear. Here, in situ tensile transmission electron microscopy was employed to directly observe {332} twin boundary migration in a Ti–12Mo alloy. Transient α’’ martensite was found at migrating twin boundaries. Lattice correspondence and Schmid factor analyses show that the activated α’’ martensite occurs as single crystallographic variant in the {332} twin and the bcc matrix, indicating that the migration of the {332} twin boundary is not governed by α’’ twinning-assisted mechanisms. Instead, α’’ acts as an interfacial accommodation structure facilitating twin boundary migration. These findings provide direct mechanistic insight into the role of α’’ martensite during {332} twin boundary migration in metastable bcc Ti alloys, demonstrating that the {332} twin migration proceeds via martensite-assisted interfacial accommodation rather than through the martensitic twinning mechanism.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"275 ","pages":"Article 117189"},"PeriodicalIF":5.6,"publicationDate":"2026-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146074174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2026-01-23DOI: 10.1016/j.scriptamat.2026.117179
Dmitrii Kretov , Tiffany Kaspar , Ben Derby , Daniel Schreiber , Djamel Kaoumi
This work reports the first observations of grain growth under irradiation of Fe oxides, specifically maghemite (γ-Fe2O3) and magnetite (Fe3O4). The Fe oxide thin films were grown by Pulsed Laser Deposition and irradiated in-situ in a Transmission Electron Microscope at 223using 1 MeV Kr2+ ions up to 8.75 x to study grain growth kinetics under irradiation. Grain growth at such low temperatures appears to follow kinetics that can be accounted for by the thermal spike model developed for metals in the literature. The corresponding activation energies were calculated and compared with other oxides. The results demonstrate that γ-Fe2O3, despite its larger initial grain size, exhibits surprisingly fast grain growth in comparison with Fe3O4, likely due to the presence of iron vacancies in the crystal structure that facilitate faster atomic diffusion under irradiation.
{"title":"Irradiation-Induced Grain Growth of γFe2O3 and Fe3O4at Cryogenic Temperatures","authors":"Dmitrii Kretov , Tiffany Kaspar , Ben Derby , Daniel Schreiber , Djamel Kaoumi","doi":"10.1016/j.scriptamat.2026.117179","DOIUrl":"10.1016/j.scriptamat.2026.117179","url":null,"abstract":"<div><div>This work reports the first observations of grain growth under irradiation of Fe oxides, specifically maghemite (γ-Fe<sub>2</sub>O<sub>3</sub>) and magnetite (Fe<sub>3</sub>O<sub>4</sub>). The Fe oxide thin films were grown by Pulsed Laser Deposition and irradiated <em>in-situ</em> in a Transmission Electron Microscope at <span><math><mrow><mo>−</mo><mspace></mspace></mrow></math></span>223<span><math><mrow><msup><mrow></mrow><mo>∘</mo></msup><mi>C</mi><mspace></mspace></mrow></math></span>using 1 MeV Kr<sup>2+</sup> ions up to 8.75 x<span><math><mrow><mspace></mspace><msup><mrow><mn>10</mn></mrow><mn>19</mn></msup><mrow><mspace></mspace><mtext>ions</mtext></mrow><mo>/</mo><msup><mrow><mi>m</mi></mrow><mn>2</mn></msup></mrow></math></span> to study grain growth kinetics under irradiation. Grain growth at such low temperatures appears to follow kinetics that can be accounted for by the thermal spike model developed for metals in the literature. The corresponding activation energies were calculated and compared with other oxides. The results demonstrate that γ-Fe<sub>2</sub>O<sub>3</sub>, despite its larger initial grain size, exhibits surprisingly fast grain growth in comparison with Fe<sub>3</sub>O<sub>4</sub>, likely due to the presence of iron vacancies in the crystal structure that facilitate faster atomic diffusion under irradiation.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"275 ","pages":"Article 117179"},"PeriodicalIF":5.6,"publicationDate":"2026-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2026-01-23DOI: 10.1016/j.scriptamat.2026.117184
Kil-dong Sung , Michal Gulka , Jaromír Kopeček , Vincent Mortet
The influence of pulsed nitrogen gas flow on microstructure and nitrogen-vacancy (NV) center formation was systematically investigated in polycrystalline diamond layers synthesized by microwave plasma chemical vapor deposition. Compared with static flow, gas pulsing enabled precise control of nitrogen-related radicals and induced a transition from microcrystalline to nanocrystalline diamond, accompanied by variations in residual stress and NV emission. Under optimized nitrogen flow, a bimodal structure emerged, comprising (001)-oriented, flake-like microcrystalline grains embedded in nanocrystalline diamond. Confocal optical analysis revealed that negatively charged NV (NV−) centers were preferentially localized within highly crystalline grains, whereas neutral NV (NV0) centers predominated at grain boundaries, forming spatially separated NV−-rich clusters. Relaxometry demonstrated that the longitudinal relaxation times of flake-like grains were comparable to those of high-quality single-crystal diamond. These findings demonstrate that pulsed nitrogen modulation provides an effective strategy for tailoring diamond microstructure and optimizing NV center formation, offering significant potential for quantum applications.
{"title":"Formation of nitrogen-vacancy centers in (001)-textured polycrystalline diamond layers through pulsed nitrogen gas flow","authors":"Kil-dong Sung , Michal Gulka , Jaromír Kopeček , Vincent Mortet","doi":"10.1016/j.scriptamat.2026.117184","DOIUrl":"10.1016/j.scriptamat.2026.117184","url":null,"abstract":"<div><div>The influence of pulsed nitrogen gas flow on microstructure and nitrogen-vacancy (NV) center formation was systematically investigated in polycrystalline diamond layers synthesized by microwave plasma chemical vapor deposition. Compared with static flow, gas pulsing enabled precise control of nitrogen-related radicals and induced a transition from microcrystalline to nanocrystalline diamond, accompanied by variations in residual stress and NV emission. Under optimized nitrogen flow, a bimodal structure emerged, comprising (001)-oriented, flake-like microcrystalline grains embedded in nanocrystalline diamond. Confocal optical analysis revealed that negatively charged NV (NV<sup>−</sup>) centers were preferentially localized within highly crystalline grains, whereas neutral NV (NV<sup>0</sup>) centers predominated at grain boundaries, forming spatially separated NV<sup>−</sup>-rich clusters. Relaxometry demonstrated that the longitudinal relaxation times of flake-like grains were comparable to those of high-quality single-crystal diamond. These findings demonstrate that pulsed nitrogen modulation provides an effective strategy for tailoring diamond microstructure and optimizing NV center formation, offering significant potential for quantum applications.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"275 ","pages":"Article 117184"},"PeriodicalIF":5.6,"publicationDate":"2026-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2026-01-23DOI: 10.1016/j.scriptamat.2026.117183
Shang Sun , Mingdi Lan , Guojian Li , Shiying Liu , Jingyi Zhu , Kai Wang , Qiang Wang
Porous structures can enhance thermoelectric films by suppressing heat transport, but excessive porosity degrades electrical conduction. Here, β-Cu2-xSe films with four pore architectures (non-pore, through-pore, half through-pore and sealing-pore) were grown on AAO templates by tuning the thickness. The sealing-pore film combines internal pores with a dense surface layer, which blocks heat flow while providing continuous carrier pathways. As a result, at 250 °C it yields a power factor of about 460 μW·m-1·K-2 and a maximum power density of 0.58 W·m-2, where the maximum power density is nearly twice that of the non-pore film prepared under the same conditions. These results show that sealing-pore structure can balance thermal insulation and electrical transport, offering a simple method for high-performance Cu2-xSe TE films and devices.
{"title":"Evolution of thermoelectric properties in Cu2-xSe films with ordered porous structures","authors":"Shang Sun , Mingdi Lan , Guojian Li , Shiying Liu , Jingyi Zhu , Kai Wang , Qiang Wang","doi":"10.1016/j.scriptamat.2026.117183","DOIUrl":"10.1016/j.scriptamat.2026.117183","url":null,"abstract":"<div><div>Porous structures can enhance thermoelectric films by suppressing heat transport, but excessive porosity degrades electrical conduction. Here, β-Cu<sub>2-x</sub>Se films with four pore architectures (non-pore, through-pore, half through-pore and sealing-pore) were grown on AAO templates by tuning the thickness. The sealing-pore film combines internal pores with a dense surface layer, which blocks heat flow while providing continuous carrier pathways. As a result, at 250 °C it yields a power factor of about 460 μW·m<sup>-1</sup>·K<sup>-2</sup> and a maximum power density of 0.58 W·m<sup>-2</sup>, where the maximum power density is nearly twice that of the non-pore film prepared under the same conditions. These results show that sealing-pore structure can balance thermal insulation and electrical transport, offering a simple method for high-performance Cu<sub>2-x</sub>Se TE films and devices.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"275 ","pages":"Article 117183"},"PeriodicalIF":5.6,"publicationDate":"2026-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146034869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2026-01-22DOI: 10.1016/j.scriptamat.2026.117182
Daniele Fattó Offidani, Emmanuelle A. Marquis
Irradiation-induced grain boundary migration (RIGM) has previously been observed in different metallic systems. However, the mechanisms and dependence on irradiation conditions remained unclear. Here, we report on radiation-induced GB migration (RIGM) in a coarse-grain Fe-Ni-Cr-Mn austenitic alloy irradiated with Fe ions at 400 °C to 15, 35, and 70 dpa. Grain boundary migration is only observed in the irradiated regions and exhibits a linear dependence on the locally delivered dose, as estimated from SRIM calculations. Notably, the same linear dependence is noted across the nominal doses. The evidence points to grain boundary migration being mediated by the flux of point defects to grain boundaries and motivates additional systematic studies of RIGM in these systems.
辐照引起的晶界迁移（RIGM）已经在不同的金属体系中被观察到。然而，其机制和对辐照条件的依赖性尚不清楚。在这里，我们报道了在400°C、15、35和70 dpa条件下，铁离子辐照的粗晶Fe- ni - cr - mn奥氏体合金中辐射诱导的GB迁移（RIGM）。晶界迁移仅在受辐照区域观察到，并且根据SRIM计算估计，晶界迁移与局部传递的剂量呈线性关系。值得注意的是，相同的线性依赖关系在名义剂量之间被注意到。证据表明晶界迁移是由点缺陷到晶界的通量介导的，这激发了对这些系统中RIGM的进一步系统研究。
{"title":"Irradiation-induced grain boundary migration in an ion irradiated Fe-Ni-Cr-Mn alloy","authors":"Daniele Fattó Offidani, Emmanuelle A. Marquis","doi":"10.1016/j.scriptamat.2026.117182","DOIUrl":"10.1016/j.scriptamat.2026.117182","url":null,"abstract":"<div><div>Irradiation-induced grain boundary migration (RIGM) has previously been observed in different metallic systems. However, the mechanisms and dependence on irradiation conditions remained unclear. Here, we report on radiation-induced GB migration (RIGM) in a coarse-grain Fe-Ni-Cr-Mn austenitic alloy irradiated with Fe ions at 400 °C to 15, 35, and 70 dpa. Grain boundary migration is only observed in the irradiated regions and exhibits a linear dependence on the locally delivered dose, as estimated from SRIM calculations. Notably, the same linear dependence is noted across the nominal doses. The evidence points to grain boundary migration being mediated by the flux of point defects to grain boundaries and motivates additional systematic studies of RIGM in these systems.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"275 ","pages":"Article 117182"},"PeriodicalIF":5.6,"publicationDate":"2026-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146034868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2026-01-22DOI: 10.1016/j.scriptamat.2026.117185
Jiayi Xiong , Haoyu Wang , Guangheng Zhang , Xirui Lv , Jiemin Wang , Jie Zhang , Jingyang Wang
Advanced multifunctional thermal environmental barrier coatings (TEBCs) are in high demand to provide environmental protection and thermal insulation for SiC-based ceramic matrix composites (CMCs). Here, the non-equiatomic high-entropy strategy was employed, expanding the vast chemical and size disorder space and enabling fine-tuning distortions to tailor the thermal behavior. Through intentional modification of Y concentration, the structural features were characterized using a Cs-corrected transmission electron microscope and a neutron powder diffractometer. It has been established that tunable distortion of [ORE4] tetrahedra endows the platform for tailoring the thermal expansion coefficient, and that the mass disorder contributes to lower thermal conductivity. This work highlights the feasibility of designing RE monosilicates for TEBC applications.
{"title":"Rational design strategy for rare-earth monosilicate with tailored thermal behavior","authors":"Jiayi Xiong , Haoyu Wang , Guangheng Zhang , Xirui Lv , Jiemin Wang , Jie Zhang , Jingyang Wang","doi":"10.1016/j.scriptamat.2026.117185","DOIUrl":"10.1016/j.scriptamat.2026.117185","url":null,"abstract":"<div><div>Advanced multifunctional thermal environmental barrier coatings (TEBCs) are in high demand to provide environmental protection and thermal insulation for SiC-based ceramic matrix composites (CMCs). Here, the non-equiatomic high-entropy strategy was employed, expanding the vast chemical and size disorder space and enabling fine-tuning distortions to tailor the thermal behavior. Through intentional modification of Y concentration, the structural features were characterized using a Cs-corrected transmission electron microscope and a neutron powder diffractometer. It has been established that tunable distortion of [ORE<sub>4</sub>] tetrahedra endows the platform for tailoring the thermal expansion coefficient, and that the mass disorder contributes to lower thermal conductivity. This work highlights the feasibility of designing RE monosilicates for TEBC applications.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"275 ","pages":"Article 117185"},"PeriodicalIF":5.6,"publicationDate":"2026-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146034867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2026-01-22DOI: 10.1016/j.scriptamat.2026.117186
Shuan Ma , Jian Liu , Jingyu Zhang , Minqing Wang , Shaolan Wang , Yixuan He , Yiwei Ju , Huiling Duan , Jing Zhu
In this study, we investigate the segregation behavior and interactions of stacking faults(SFs) and microtwins in the 718Plus under 650 °C/800 MPa and 730 °C/500 MPa by atomic-scale Z-contrast (High angle annular dark field image, HAADF) in combination with creep models. Our results reveal that creep deformation is dominated by SFs and microtwins, with pronounced Nb and Co enrichment alongside Al and Ni depletion at SFs sites. Furthermore, γ″-Ni3Nb precipitates nucleate preferentially at SFs intersections, suggesting a dynamic interplay between defect evolution and precipitation. A comparative analysis of microtwinning-based creep models and experimental data demonstrates that microtwinning in the γ' phase provides the dominant strengthening contribution, yielding a slip resistance of approximately 92.3 MPa-accounting for 62% of the total hardening. In stark contrast, γ″-induced hardening is negligible (∼0.15 MPa). These atomic-scale insights advance our understanding of creep mechanisms and γ″ precipitation in 718Plus superalloys, providing critical guidance for alloy design.
{"title":"Elemental segregation-dependent γ″ nucleation on stacking faults during creep in 718Plus superalloy","authors":"Shuan Ma , Jian Liu , Jingyu Zhang , Minqing Wang , Shaolan Wang , Yixuan He , Yiwei Ju , Huiling Duan , Jing Zhu","doi":"10.1016/j.scriptamat.2026.117186","DOIUrl":"10.1016/j.scriptamat.2026.117186","url":null,"abstract":"<div><div>In this study, we investigate the segregation behavior and interactions of stacking faults(SFs) and microtwins in the 718Plus under 650 °C/800 MPa and 730 °C/500 MPa by atomic-scale Z-contrast (High angle annular dark field image, HAADF) in combination with creep models. Our results reveal that creep deformation is dominated by SFs and microtwins, with pronounced Nb and Co enrichment alongside Al and Ni depletion at SFs sites. Furthermore, γ″-Ni<sub>3</sub>Nb precipitates nucleate preferentially at SFs intersections, suggesting a dynamic interplay between defect evolution and precipitation. A comparative analysis of microtwinning-based creep models and experimental data demonstrates that microtwinning in the γ' phase provides the dominant strengthening contribution, yielding a slip resistance of approximately 92.3 MPa-accounting for 62% of the total hardening. In stark contrast, γ″-induced hardening is negligible (∼0.15 MPa). These atomic-scale insights advance our understanding of creep mechanisms and γ″ precipitation in 718Plus superalloys, providing critical guidance for alloy design.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"275 ","pages":"Article 117186"},"PeriodicalIF":5.6,"publicationDate":"2026-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146034866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2026-01-16DOI: 10.1016/j.scriptamat.2026.117167
Rafael B. Rosante, Ricardo F. Lancelotti, Edgar D. Zanotto
Glass-forming ability (GFA) is a key parameter that determines how easily a liquid can vitrify, with significant scientific and technological implications. Its accurate evaluation is challenging due to the complexity of experimental measurements and theoretical calculations. A simplified predictor, the JeZiCA model, was previously proposed as , where is the liquidus temperature and is the viscosity at that temperature. In this study, we extend this approach by introducing two refined formulations, JeZCAT and JeZCAH, which additionally consider model parameters, including the temperature of maximum crystal growth rate (, the corresponding viscosity , the atomic jump distance (λ), and the free energy change of crystallization (∆G), estimated using the Turnbull and Hoffman methods. Testing these refined formulations on 20 stoichiometric oxide compositions reveals a slightly improved performance ( from 0.87 to 0.90). However, the original JeZiCA model remains a simple and effective predictor, since machine learning models can estimate and from composition, avoiding glass production.
{"title":"JeZCA and JeZiCA – Powerful predictors of glass-forming ability","authors":"Rafael B. Rosante, Ricardo F. Lancelotti, Edgar D. Zanotto","doi":"10.1016/j.scriptamat.2026.117167","DOIUrl":"10.1016/j.scriptamat.2026.117167","url":null,"abstract":"<div><div>Glass-forming ability (GFA) is a key parameter that determines how easily a liquid can vitrify, with significant scientific and technological implications. Its accurate evaluation is challenging due to the complexity of experimental measurements and theoretical calculations. A simplified predictor, the JeZiCA model, was previously proposed as <span><math><mrow><mi>η</mi><mrow><mo>(</mo><msub><mi>T</mi><mi>L</mi></msub><mo>)</mo></mrow><mo>/</mo><msup><mrow><msub><mi>T</mi><mi>L</mi></msub></mrow><mn>2</mn></msup></mrow></math></span>, where <span><math><msub><mi>T</mi><mi>L</mi></msub></math></span> is the liquidus temperature and <span><math><mrow><mi>η</mi><mo>(</mo><msub><mi>T</mi><mi>L</mi></msub><mo>)</mo></mrow></math></span> is the viscosity at that temperature. In this study, we extend this approach by introducing two refined formulations, JeZCAT and JeZCAH, which additionally consider model parameters, including the temperature of maximum crystal growth rate (<span><math><mrow><msub><mi>T</mi><mi>n</mi></msub><mrow><mo>)</mo></mrow></mrow></math></span>, the corresponding viscosity <span><math><mrow><mi>η</mi><mo>(</mo><msub><mi>T</mi><mi>n</mi></msub><mo>)</mo></mrow></math></span>, the atomic jump distance (λ), and the free energy change of crystallization (∆G), estimated using the Turnbull and Hoffman methods. Testing these refined formulations on 20 stoichiometric oxide compositions reveals a slightly improved performance (<span><math><msup><mi>R</mi><mn>2</mn></msup></math></span> from 0.87 to 0.90). However, the original JeZiCA model remains a simple and effective predictor, since machine learning models can estimate <span><math><msub><mi>T</mi><mi>L</mi></msub></math></span> and <span><math><mrow><mi>η</mi><mo>(</mo><msub><mi>T</mi><mi>L</mi></msub><mo>)</mo></mrow></math></span> from composition, avoiding glass production.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"275 ","pages":"Article 117167"},"PeriodicalIF":5.6,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2026-01-15DOI: 10.1016/j.scriptamat.2026.117177
Mingyang Wang , Yi Li , Yuanhang Gao , Pengting Li , Yinong Wang , Yi Tan
High-strength, lamellar-structured Ni-Cr-Al alloys are critically important for industrial components, but their application is severely limited by an intrinsic brittleness originating from the rigid, non-deforming nature of the nano-scale α-Cr (BCC) lamellae. Here, we resolve this long-standing strength-ductility conflict by designing a “dual-heterostructure” that partitions the α-Cr strengthening phase into two functionally distinct morphologies: the original strength-providing nano-lamellae and the newly introduced, deformable submicron-scale globular particles. These submicron-scale particles uniquely capable of accommodating plasticity, acting as dynamic dislocation sinks to delocalize strain. This functional synergy activates a sustained, non-saturating hetero-deformation-induced (HDI) hardening, which continuously elevates the work-hardening rate. This unique mechanism produces an exceptional combination of an ultimate tensile strength over 1.5 GPa and a total elongation exceeding 17%. Our work demonstrates that engineering the deformability of a secondary hard phase, while preserving the primary strengthening backbone, offers a new and potent strategy for creating damage-tolerant, ultra-strong alloys.
{"title":"Strong and ductile hetero-lamellar-structured alloy with a dual heterogeneous microstructure","authors":"Mingyang Wang , Yi Li , Yuanhang Gao , Pengting Li , Yinong Wang , Yi Tan","doi":"10.1016/j.scriptamat.2026.117177","DOIUrl":"10.1016/j.scriptamat.2026.117177","url":null,"abstract":"<div><div>High-strength, lamellar-structured Ni-Cr-Al alloys are critically important for industrial components, but their application is severely limited by an intrinsic brittleness originating from the rigid, non-deforming nature of the nano-scale α-Cr (BCC) lamellae. Here, we resolve this long-standing strength-ductility conflict by designing a “dual-heterostructure” that partitions the α-Cr strengthening phase into two functionally distinct morphologies: the original strength-providing nano-lamellae and the newly introduced, deformable submicron-scale globular particles. These submicron-scale particles uniquely capable of accommodating plasticity, acting as dynamic dislocation sinks to delocalize strain. This functional synergy activates a sustained, non-saturating hetero-deformation-induced (HDI) hardening, which continuously elevates the work-hardening rate. This unique mechanism produces an exceptional combination of an ultimate tensile strength over 1.5 GPa and a total elongation exceeding 17%. Our work demonstrates that engineering the deformability of a secondary hard phase, while preserving the primary strengthening backbone, offers a new and potent strategy for creating damage-tolerant, ultra-strong alloys.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"275 ","pages":"Article 117177"},"PeriodicalIF":5.6,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ultrafine grained metals, with grain size ranging from 100 nm to 1 μm, generally exhibit increasing strength with decreasing grain size, as expected by the Hall-Petch relationship. Contrary to this trend, we observe an increase in yield strength from 310 to 520 MPa as the average grain size of Au thin films increases from 140 to 360 nm after annealing at 350 °C. Quantitative in situ TEM nanomechanical testing reveals that the grain size distribution plays a key role in determining the films’ yield strength. In the as-deposited state, a large area fraction of nanograins (<50 nm in size) adjacent to larger grains results in substantial stress-assisted grain-boundary migration and grain coalescence, leading to yielding at relatively low applied stresses. When these small grains are removed through annealing, grain boundary migration is largely suppressed, and higher stresses are required to initiate dislocation-mediated yielding, despite the coarser average grain size.
{"title":"The role of grain size distribution on the anomalous yielding of ultrafine-grained Au thin films","authors":"Yichen Yang , Kunqing Ding , Ting Zhu , Josh Kacher , Olivier Pierron","doi":"10.1016/j.scriptamat.2026.117178","DOIUrl":"10.1016/j.scriptamat.2026.117178","url":null,"abstract":"<div><div>Ultrafine grained metals, with grain size ranging from 100 nm to 1 μm, generally exhibit increasing strength with decreasing grain size, as expected by the Hall-Petch relationship. Contrary to this trend, we observe an increase in yield strength from 310 to 520 MPa as the average grain size of Au thin films increases from 140 to 360 nm after annealing at 350 °C. Quantitative in situ TEM nanomechanical testing reveals that the grain size distribution plays a key role in determining the films’ yield strength. In the as-deposited state, a large area fraction of nanograins (<50 nm in size) adjacent to larger grains results in substantial stress-assisted grain-boundary migration and grain coalescence, leading to yielding at relatively low applied stresses. When these small grains are removed through annealing, grain boundary migration is largely suppressed, and higher stresses are required to initiate dislocation-mediated yielding, despite the coarser average grain size.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"275 ","pages":"Article 117178"},"PeriodicalIF":5.6,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号