Scripta Materialia最新文献

Thick-film SmCo5 micromagnet fabrication using molten salt 熔盐制备厚膜SmCo5微磁体

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-05-30 DOI: 10.1016/j.scriptamat.2025.116775

Ryogen Fujiwara, Daisuke Shiga , Masaki Tomita, Mio Otsuru, Kenichi Suzuki, Yoshinori Fujikawa

{"title":"Thick-film SmCo5 micromagnet fabrication using molten salt","authors":"Ryogen Fujiwara, Daisuke Shiga , Masaki Tomita, Mio Otsuru, Kenichi Suzuki, Yoshinori Fujikawa","doi":"10.1016/j.scriptamat.2025.116775","DOIUrl":"10.1016/j.scriptamat.2025.116775","url":null,"abstract":"<div><div>Sintered Nd-Fe-B magnets encounter thickness and shape limitations due to machining-induced degradation. Although Nd-Fe-B magnetic films show promise, achieving thicker films with complex shapes and larger sample sizes is difficult due to limitations in existing deposition methods. In this study, we successfully developed a method to fabricate a 100-μm-thick SmCo<sub>5</sub> micromagnet film on a complex Co structure using molten-salt processing to diffuse Sm into Co. The magnetic properties of the film were characterized using vibrating sample magnetometry measurements, revealing a zero-field magnetic flux density of ∼1.0 T and coercivity of ∼820 kA/m. The fabricated film exhibited anisotropic magnetism, with its easy magnetization axis aligned along the thickness direction. Utilizing the unique properties of the micromagnet, we then designed and fabricated a stable 1.5-mm-diameter micromotor, capable of rotating at 1,000 rpm. This study enables the fabrication of 100-μm-thick SmCo₅ micromagnets for miniaturized electromagnetic systems, offering potential applications in advanced electromechanical devices.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"266 ","pages":"Article 116775"},"PeriodicalIF":5.3,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144166420","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}

引用次数: 0

Mitigating hydrogen embrittlement in a 1.8 GPa-grade press-hardened steel by internal stress relaxation via low-temperature tempering 通过低温回火的内应力松弛来减轻1.8 gpa级压硬化钢的氢脆

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-05-29 DOI: 10.1016/j.scriptamat.2025.116789

Z.D. Zhao , H. Liu , J.Z. Zhu , D.H. Du , K.H. Zheng , F.X. Yin , M.X. Huang , Z.C. Luo

引用次数: 0

Breakthroughs in scanning electron microscopy poling of massive dense and porous lead-free piezoelectric ceramics 块状致密多孔无铅压电陶瓷扫描电镜极化研究取得突破性进展

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-05-29 DOI: 10.1016/j.scriptamat.2025.116795

Pietro Galizia , Alessia Tavolaro , Carlo Baldisserri , Floriana Craciun , Elisa Mercadelli

引用次数: 0

Hierarchical MgAl2O4/Al3Ti nucleating agents induce full equiaxed grains in laser-powder-bed-fused Al alloys 分层形核剂MgAl2O4/Al3Ti在激光粉末床熔合铝合金中诱导出全等轴晶粒

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-05-28 DOI: 10.1016/j.scriptamat.2025.116790

Zhendong Jia , Qiaonan Shu , Biao Chen , Fangqi Liu , Lei Jia , Pingxiang Zhang , Jinshan Li

{"title":"Hierarchical MgAl2O4/Al3Ti nucleating agents induce full equiaxed grains in laser-powder-bed-fused Al alloys","authors":"Zhendong Jia , Qiaonan Shu , Biao Chen , Fangqi Liu , Lei Jia , Pingxiang Zhang , Jinshan Li","doi":"10.1016/j.scriptamat.2025.116790","DOIUrl":"10.1016/j.scriptamat.2025.116790","url":null,"abstract":"<div><div>Laser powder bed fusion (LPBF) provides high design freedom for high-strength aluminum alloys in aerospace and automotive industries. However, the rapid solidification of LPBF results in a critical microstructural challenge in aluminum alloys: coarse columnar grains with anisotropy and cracking. In this work, we employ the synergistic effect of magnesium and titanium elements in aluminum alloys for building self-assembled MgAl<sub>2</sub>O<sub>4</sub>/Al<sub>3</sub>Ti hierarchical architectures as a highly efficient nucleation agent. In-situ MgAl<sub>2</sub>O<sub>4</sub> nanoparticles offer coherent interfaces (lattice mismatch: 0.05 %) for the nucleation of L1<sub>2</sub>-structured Al<sub>3</sub>Ti phase, facilitating the formation of fully equiaxed grains with random orientations in aluminum alloys. Aberration-corrected transmission electron microscopy demonstrates atomic-scale coherence at MgAl<sub>2</sub>O<sub>4</sub>/Al<sub>3</sub>Ti interfaces, confirming MgAl<sub>2</sub>O<sub>4</sub> as effective nucleation substrates for Al<sub>3</sub>Ti phase. Our study provides a new microstructure-design strategy for LPBF, achieving aluminum alloys with fully equiaxed grains.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"266 ","pages":"Article 116790"},"PeriodicalIF":5.3,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144147334","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}

引用次数: 0

High-throughput evaluation of alloying effect on hydrogen diffusion of ultra-high strength steel 合金对超高强度钢氢扩散影响的高通量评价

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-05-28 DOI: 10.1016/j.scriptamat.2025.116791

Xilin Xiong , Jingjing Yang , Chunlei Shang , Honghui Wu , Rongjian Shi , Zhaoxiang Ma , Yanjing Su

{"title":"High-throughput evaluation of alloying effect on hydrogen diffusion of ultra-high strength steel","authors":"Xilin Xiong , Jingjing Yang , Chunlei Shang , Honghui Wu , Rongjian Shi , Zhaoxiang Ma , Yanjing Su","doi":"10.1016/j.scriptamat.2025.116791","DOIUrl":"10.1016/j.scriptamat.2025.116791","url":null,"abstract":"<div><div>Hydrogen embrittlement is a critical factor limiting the development of ultra-high-strength steel for automotive applications.To enhance the efficiency of alloy design for HE resistance in ultra-high-strength steel, this study presents a high-throughput approach to measure hydrogen diffusion coefficients in martensitic steels using scanning Kelvin probe force microscopy integrated with diffusion multiple techniques. By analyzing regions with varying Cr and Mo contents, we demonstrate that these solutes induce subtle microstructural changes, reducing grain size and low-angle grain boundary fractions while increasing high-angle grain boundaries. The hydrogen diffusion coefficient decreases with higher Cr and Mo contents, primarily due to lattice distortions, with Mo showing a stronger effect owing to its larger atomic radius. Supported by EBSD, HADDF, and statistical analyses, these findings elucidate the influence of solute alloying on the reduction of the hydrogen diffusion coefficient, providing a robust framework for rapid alloy screening and optimization.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"266 ","pages":"Article 116791"},"PeriodicalIF":5.3,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144166417","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}

引用次数: 0

Atomic insights into strain-induced nanoscopic compositional fluctuation in AlGaN quantum well epitaxy AlGaN量子阱外延中应变诱导的纳米级成分波动的原子见解

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-05-28 DOI: 10.1016/j.scriptamat.2025.116788

Chia-Yen Huang , Ying-Chun Chao , Hung-Wei Yen

引用次数: 0

Non-equilibrium kinetic Phase-diagram in undercooling solidification: A case of Pseudo-binary MgTiO3-TiO2 system 过冷凝固非平衡动力学相图：以伪二元MgTiO3-TiO2体系为例

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-05-27 DOI: 10.1016/j.scriptamat.2025.116787

Yilong Yang, Xuan Ge, Jianguo Li, Qiaodan Hu

{"title":"Non-equilibrium kinetic Phase-diagram in undercooling solidification: A case of Pseudo-binary MgTiO3-TiO2 system","authors":"Yilong Yang, Xuan Ge, Jianguo Li, Qiaodan Hu","doi":"10.1016/j.scriptamat.2025.116787","DOIUrl":"10.1016/j.scriptamat.2025.116787","url":null,"abstract":"<div><div>Extreme solidification processes in advanced manufacturing (e.g., laser additive manufacturing and in space fabrication) amplify challenges in predicting phase selection under severe thermodynamic non-equilibrium. Using aerodynamic levitation containerless processing, we investigate the solidification behavior of pseudo-binary MgTiO<sub>3</sub>-TiO<sub>2</sub> system. Our experiments reveal an anomalous trans-phase-regime selection phenomenon in which the thermodynamically stable MgTi<sub>2</sub>O<sub>5</sub> phase is kinetically suppressed from precipitation. This selection arises from nucleation kinetic barriers of MgTi<sub>2</sub>O<sub>5</sub>, where coupled undercooling and compositional fluctuations destabilize critical nuclei formation. By integrating composition- and temperature-dependent interfacial energy dynamics into classical nucleation theory, we develop a predictive framework that quantitatively maps anomalous phase selection regions. This approach establishes the first non-equilibrium kinetic phase diagram of this system with experimental validation, resolving long-standing discrepancies between equilibrium predictions and non-equilibrium experimental outcomes. The proposed methodology establishes a generalized paradigm for phase selection prediction, offering transformative insights into microstructure and phase control under extreme non-equilibrium solidification conditions.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"266 ","pages":"Article 116787"},"PeriodicalIF":5.3,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144147298","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}

引用次数: 0

Inversion of dislocation-impurity interactions in α-Fe under magnetic state changes 磁态变化下α-Fe中位错-杂质相互作用的反转

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-05-26 DOI: 10.1016/j.scriptamat.2025.116766

Franco Moitzi , Lorenz Romaner , Andrei V. Ruban , Swarnava Ghosh , Markus Eisenbach , Oleg E. Peil

引用次数: 0

Nanowire growth of aluminum carbide ceramics by cobalt-based catalyst and its photoluminescence characteristics 钴基催化剂制备碳化铝陶瓷纳米线及其光致发光特性

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-05-26 DOI: 10.1016/j.scriptamat.2025.116774

Yasuhiro Kimura , Ren Iwaya , Naoki Azuma , Yuhki Toku , Yang Ju

{"title":"Nanowire growth of aluminum carbide ceramics by cobalt-based catalyst and its photoluminescence characteristics","authors":"Yasuhiro Kimura , Ren Iwaya , Naoki Azuma , Yuhki Toku , Yang Ju","doi":"10.1016/j.scriptamat.2025.116774","DOIUrl":"10.1016/j.scriptamat.2025.116774","url":null,"abstract":"<div><div>Al<sub>4</sub>C<sub>3</sub> nanowires (NWs) are one-dimensional ceramic nanomaterials that have attracted attention for potential applications in field-emission (FE) and photoluminescence (PL) devices owing to their unique crystal structure. The principle behind their synthesis often relies on the vapor-liquid-solid (VLS) process, which is widely applied to semiconductor NWs. However, to achieve stable synthesis, it is necessary to identify sustainable and appropriate catalysts and to elucidate the NW growth principle. This study reports the synthesis of Al<sub>4</sub>C<sub>3</sub> NWs using CoAl as a catalyst, demonstrates the effectiveness of the catalyst for NW growth, and suggests the possibility of future application to PL devices. Electron microscopy analyses revealed the NW growth mechanism by examining the crystallographic relationship between the NW and the catalyst. The synthesis environment inferred from this experiment was compatible with the conventional VLS method, representing a pioneering achievement that will facilitate the large-scale synthesis of Al<sub>4</sub>C<sub>3</sub> NWs.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"266 ","pages":"Article 116774"},"PeriodicalIF":5.3,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135021","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}

引用次数: 0

A novel high-performance Co-Al-W-based superalloy for additive manufacturing 用于增材制造的新型高性能co - al - w基高温合金

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-05-24 DOI: 10.1016/j.scriptamat.2025.116771

Junying Yang , Wei Song , Peng Wang , Mingsong Hao , Lei Shi , Liming Lei , Yizhou Zhou , Xiaofeng Sun , Jingjing Liang , Jinguo Li

{"title":"A novel high-performance Co-Al-W-based superalloy for additive manufacturing","authors":"Junying Yang , Wei Song , Peng Wang , Mingsong Hao , Lei Shi , Liming Lei , Yizhou Zhou , Xiaofeng Sun , Jingjing Liang , Jinguo Li","doi":"10.1016/j.scriptamat.2025.116771","DOIUrl":"10.1016/j.scriptamat.2025.116771","url":null,"abstract":"<div><div>An unprecedented high-γ' content Co-Al-W-based superalloy ZGH688 has been proposed for laser-directed energy deposition (L-DED), which exhibits excellent crack-resistant and mechanical properties. In this alloy, the volume fraction of γ' phase is 77.5 ± 5.5 %, surpassing other typical Ni/Co superalloys fabricated by additive manufacturing technique. Meanwhile, the γ' precipitate shows an excellent cubic degree with a 47.7 ± 7.6 nm side length. A series of crack evaluation criteria show that the composition of ZGH688 alloy falls into the crack-free zone. Additionally, this work validates that the modeling approach to defect optimization in Ni-based superalloys is suitable for Co-Al-W-based alloys. Finally, the newly AMed ZGH688 alloy demonstrates superior mechanical behavior under both room and high temperatures compared with other as-built Ni/Co-based superalloys. This work demonstrates the enormous potential of the freshly Co-Al-W-based superalloys in additive manufacturing for high-temperature applications.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"266 ","pages":"Article 116771"},"PeriodicalIF":5.3,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123458","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}

引用次数: 0