Scripta Materialia最新文献_第8页

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-06-11 DOI: 10.1016/j.scriptamat.2025.116799

Luke Hunter , Ryo Torii , Gaetano Burriesci , Sergio Bertazzo

引用次数: 0

Thermo-electrical analysis of joule heating effects at grain boundaries during field-assisted sintering of yttria-doped ceria 场助烧结掺钇铈晶界焦耳热效应的热电分析

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-06-10 DOI: 10.1016/j.scriptamat.2025.116814

Junyoung Chae , Robert Mücke , Payam Kaghazchi , Olivier Guillon , Heung Nam Han

{"title":"Thermo-electrical analysis of joule heating effects at grain boundaries during field-assisted sintering of yttria-doped ceria","authors":"Junyoung Chae , Robert Mücke , Payam Kaghazchi , Olivier Guillon , Heung Nam Han","doi":"10.1016/j.scriptamat.2025.116814","DOIUrl":"10.1016/j.scriptamat.2025.116814","url":null,"abstract":"<div><div>This study investigates the role of local microscopic Joule heating at grain boundaries in the enhanced sintering behaviour of ceria under moderate electric fields. While fields as low as 10 V/cm are known to significantly accelerate sintering, the underlying mechanism remains unclear. Three potential factors have been proposed: macroscopic Joule heating (previously ruled out), local Joule heating at grain boundaries, and direct field-induced modifications of grain boundary structures enhancing diffusion. Focusing on the second hypothesis, thermo-electrical finite element (FE) simulations were conducted for a realistic microstructure of 10 mol% yttria-doped ceria (YDC) at 1208 °C under a field strength of 14 V/cm, incorporating appropriate grain boundary properties. The simulations revealed that power dissipation at grain boundaries is minimal (∼0.1 W/mm³), resulting in negligible local temperature rises (<0.1 K). These findings exclude microscopic Joule heating as a significant contributor to the field-enhanced sintering of ceria.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"267 ","pages":"Article 116814"},"PeriodicalIF":5.3,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144255432","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

Impacts of excess vacancies on order-domain growth in D03 Fe3Al intermetallic phase 过量空位对D03 Fe3Al金属间相有序畴生长的影响

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-06-09 DOI: 10.1016/j.scriptamat.2025.116812

Masayuki Okugawa , Madoka Watanabe , Satoshi Ichikawa , Kazuhisa Sato , Yuheng Liu , Hiroyuki Y. Yasuda , Yuichiro Koizumi

{"title":"Impacts of excess vacancies on order-domain growth in D03 Fe3Al intermetallic phase","authors":"Masayuki Okugawa , Madoka Watanabe , Satoshi Ichikawa , Kazuhisa Sato , Yuheng Liu , Hiroyuki Y. Yasuda , Yuichiro Koizumi","doi":"10.1016/j.scriptamat.2025.116812","DOIUrl":"10.1016/j.scriptamat.2025.116812","url":null,"abstract":"<div><div>Properties of intermetallic compounds depend on the degree of order and the size of ordered domain (i.e., antiphase domain). Phase-field simulations can predict domain growth. However, precise prediction requires understanding of the ordering mobility. Herein, we examine the impact of excess vacancies on the ordered-domain growth in D0<sub>3</sub>-Fe<sub>3</sub>Al intermetallics using <em>in-situ</em> transmission electron microscopy (TEM). It was found that ordering mobility is correlated with excess vacancies introduced via rapid quenching from the disordered state. The similarity between the dependence of ordering mobility at 773 K on the quenching temperature and the dependence of equilibrium vacancy concentration on the temperature suggests that the diffusion for migration of domain boundary is dominated by the quenched-in excess vacancies. These findings advance fundamental understanding and enable control over the ordering in intermetallic fabrication through rapid solidification processes, such as powder bed fusion-type additive manufacturing.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"267 ","pages":"Article 116812"},"PeriodicalIF":5.3,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144239969","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 twinning mechanism: Direct observation of the transition from stacking faults to Microtwins 孪生机制：从层错到微孪生转变的直接观察

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-06-09 DOI: 10.1016/j.scriptamat.2025.116803

Xiaokun Li , Haopeng Zhang , Jian Jia , Jiantao Liu , Yiwen Zhang

{"title":"A twinning mechanism: Direct observation of the transition from stacking faults to Microtwins","authors":"Xiaokun Li , Haopeng Zhang , Jian Jia , Jiantao Liu , Yiwen Zhang","doi":"10.1016/j.scriptamat.2025.116803","DOIUrl":"10.1016/j.scriptamat.2025.116803","url":null,"abstract":"<div><div>The transition mechanism from stacking faults to microtwins in nickel-based superalloys remains debated despite its critical role in governing high-temperature creep behavior. Here, we directly observe the atomic-scale evolution of superlattice extrinsic stacking faults (SESFs) into microtwins during creep deformation at 815 °C/490 MPa using aberration-corrected scanning transmission electron microscopy (STEM). Transitional regions exhibit coexisting microtwin-like symmetry and residual stacking fault misalignment, confirming that sequential shearing of a/6 < 112> Shockley partial dislocations and subsequent atomic rearrangement drive SESF-to-microtwin conversion. Notably, microtwins exclusively originate within the γ′ phase, with no evidence of matrix-initiated twins. These findings experimentally validate the Kolbe atomic rearrangement mechanism while challenging hypotheses proposing matrix-driven twin formation in analogous systems. The results provide a foundational framework for understanding deformation pathways and designing creep-resistant alloys, particularly for applications demanding microstructural stability under extreme thermomechanical conditions.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"267 ","pages":"Article 116803"},"PeriodicalIF":5.3,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144239968","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

Oxygen-induced interfacial structure selection, dopant segregation and adhesive strength of α/β interfaces in titanium alloys 钛合金中氧致界面结构选择、掺杂偏析及α/β界面的结合强度

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-06-07 DOI: 10.1016/j.scriptamat.2025.116813

Xiaofu Zhang , Shu Wang , Minghao Hua , Ruirun Chen , Weipeng Xu , Hongwei Wang

{"title":"Oxygen-induced interfacial structure selection, dopant segregation and adhesive strength of α/β interfaces in titanium alloys","authors":"Xiaofu Zhang , Shu Wang , Minghao Hua , Ruirun Chen , Weipeng Xu , Hongwei Wang","doi":"10.1016/j.scriptamat.2025.116813","DOIUrl":"10.1016/j.scriptamat.2025.116813","url":null,"abstract":"<div><div>The dopant segregation and interfacial strengthening in multi-phase engineering alloys have been extensively investigated to understand bonding behavior and enhance mechanical properties by employing density functional theory (DFT). However, the properties of interface involving dynamical/mechanical unstable structures, e.g., β-Ti at low temperatures, are still obscured. We employed DFT with tailored restrictive relaxation to comprehensively investigate the structure, segregation and strength of α/β interface in titanium alloys. The results provide a new insight to the inconsistency of α/β interface types between theoretical calculations and experimental observations, i.e., the hollow-type interface would be destroyed by inevitable oxygen impurities. Moreover, many reported segregation behaviors observations are rationalized in the case of single doping. Boron is screened as the most effective strengthening element, and origin of interface hardening is revealed by electronic structure analysis. Furthermore, we explore the promising selections of X-O co-strengthening strategy to promote environment-friendly development of titanium alloys.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"267 ","pages":"Article 116813"},"PeriodicalIF":5.3,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144239967","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

The role of excess vacancies in stabilizing solute clusters in low-alloy steels 过量空位在稳定低合金钢中溶质团簇中的作用

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-06-06 DOI: 10.1016/j.scriptamat.2025.116797

Jia-Hong Ke , Anshul Kamboj , Mukesh Bachhav

引用次数: 0

Tribological improvements through in-situ oxide layer formation in Fe-based nano-dual-phase glass-crystal alloys 原位氧化层形成对铁基纳米双相玻璃晶合金摩擦学性能的改善

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-06-05 DOI: 10.1016/j.scriptamat.2025.116793

Xiyan Lei , Yi Ren , Long Wang , Zhi-Wei Shan , Ge Wu

引用次数: 0

Influence of boron substitution at Si-site and associated interplay between structure, water-stability, ion-transport and interfacial resistance of NASICON-structured Na3Zr2Si2PO12-based solid electrolyte si位硼取代对nasiconon结构na3zr2si2po12基固体电解质结构、水稳定性、离子输运和界面阻力的影响

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-06-05 DOI: 10.1016/j.scriptamat.2025.116800

Illa Mani Pujitha , Sreyanka Karmakar , Bibek Samanta , Sushobhan Kobi , Shivam More , Amartya Mukhopadhyay

{"title":"Influence of boron substitution at Si-site and associated interplay between structure, water-stability, ion-transport and interfacial resistance of NASICON-structured Na3Zr2Si2PO12-based solid electrolyte","authors":"Illa Mani Pujitha , Sreyanka Karmakar , Bibek Samanta , Sushobhan Kobi , Shivam More , Amartya Mukhopadhyay","doi":"10.1016/j.scriptamat.2025.116800","DOIUrl":"10.1016/j.scriptamat.2025.116800","url":null,"abstract":"<div><div>Boron (B<sup>3+</sup>) substitution for Si<sup>4+</sup> in the tetrahedral site of NASICON-structured Na<sub>3</sub>Zr<sub>2</sub>Si<sub>2</sub>PO<sub>12</sub>-based polycrystalline solid electrolyte (NZSP), as confirmed via diffraction and solid-state <sup>11</sup>B NMR, has been found to improve the sinter-density to ∼98.4 %ρ<sub>th</sub> (from ∼93.2 %ρ<sub>th</sub>) and enlarge the grain size by ∼73 %. The combination of enhanced grain/bulk Na-ion conductivity due to increment in the Na-content and lowered grain-boundary resistance due to enlarged grain size, as well as accrued sinter-density, results in an overall enhancement of Na-ion conductivity by ∼143 %. Shrinkage of unit cell and reduction in grain boundary area also render B<sup>3+</sup>-substituted NZSP 'water-stable'. Furthermore, B<sup>3+</sup>-substitution improves mechanical properties and lowers Na/NZSP interfacial resistance (by ∼58 %; to ∼194 Ω cm<sup>2</sup>), which are beneficial towards suppression of Na-dendrite growth/penetration. Overall, this work not only reveals an interesting interplay between the above aspects for inorganic ion conductors, but also showcases the importance of adopting an integrated strategy towards the development of superior solid electrolytes for next-generation solid-state batteries.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"267 ","pages":"Article 116800"},"PeriodicalIF":5.3,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144213481","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

Gamma-ray promoted defects dipole migration and fast aging mechanism in KNN-based ceramics γ射线促进knn基陶瓷缺陷偶极子迁移及快速老化机理

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-06-04 DOI: 10.1016/j.scriptamat.2025.116792

Yongqi Pan , Yi Ding , Yuntao Huang , Ting Zheng , Jiagang Wu

{"title":"Gamma-ray promoted defects dipole migration and fast aging mechanism in KNN-based ceramics","authors":"Yongqi Pan , Yi Ding , Yuntao Huang , Ting Zheng , Jiagang Wu","doi":"10.1016/j.scriptamat.2025.116792","DOIUrl":"10.1016/j.scriptamat.2025.116792","url":null,"abstract":"<div><div>The property evolution of piezoelectric ceramics under extreme environments such as gamma irradiation still lacks research. Here, the evolution of structure and electrical properties for potassium sodium niobate [K, Na)NbO<sub>3</sub>]-based ceramics under γ-ray irradiation was systematically investigated, with a focus on possible defect dipole migration mechanism. Compared with unirradiated ceramics, ceramics after irradiation have a stable <em>d</em><sub>33</sub> and rapid increase of <em>Q</em><sub>m</sub> as well as a fast-aging phenomenon. This is attributed to the hardened domain walls, instead of the variation of domain structure and the number of defect dipoles. The internal defect dipoles (<span><math><msup><mrow><mo>[</mo><mrow><mi>C</mi><msubsup><mi>u</mi><mrow><mi>N</mi><mi>b</mi></mrow><msup><mrow></mrow><mrow><mo>″</mo><mo>′</mo></mrow></msup></msubsup><mo>−</mo><msubsup><mi>V</mi><mi>O</mi><mrow><mo>.</mo><mo>.</mo></mrow></msubsup></mrow><mo>]</mo></mrow><mo>′</mo></msup></math></span>) are at a lower energy position, which will move toward the domain walls and produce a strong pinning effect during irradiation. This work reveals the property evolution and corresponding defect dipole migration mechanism in the piezoceramics under gamma irradiation, provides basic understanding for piezo-devices operating in harsh environments.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"267 ","pages":"Article 116792"},"PeriodicalIF":5.3,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144204628","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

Mechanical amorphization drives fragmentation in a nanocrystalline Ni 机械非晶化驱动镍纳米晶的破碎

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-06-02 DOI: 10.1016/j.scriptamat.2025.116798

Zhuofei Li , Heng Li , Lei Zhao , Longlong Ma , Shuang Han , Hongxiang Zong , Jianshe Lian , Xiaozhou Liao , Gang Sha , Xiangdong Ding , Jun Sun

引用次数: 0