Scripta Materialia最新文献_第4页

Minor Al addition tuning relationship of crystal-like structures and fast β’ relaxation in Cu-Zr metallic glasses Cu-Zr金属玻璃中微量Al添加与晶状结构和快速β′弛豫的调谐关系

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2025-09-17 DOI: 10.1016/j.scriptamat.2025.116993

Nizhen Zhang , Kang Sun , Qun Yang , Dongmei Li , Xin Jin , Qing Wang , Peng Yu

{"title":"Minor Al addition tuning relationship of crystal-like structures and fast β’ relaxation in Cu-Zr metallic glasses","authors":"Nizhen Zhang , Kang Sun , Qun Yang , Dongmei Li , Xin Jin , Qing Wang , Peng Yu","doi":"10.1016/j.scriptamat.2025.116993","DOIUrl":"10.1016/j.scriptamat.2025.116993","url":null,"abstract":"<div><div>Glassy dynamics, a fundamentally important yet long-standing issue of glass physics, is however crucial in understanding the intrinsic properties of metallic glasses. By means of mechanical spectroscopy, high-resolution transmission electron microscopy and molecular dynamical simulation, here we report the evolution of fast process in addition to the slow β relaxation in the Cu-Zr based metallic glasses due to minor Al elemental addition. It is revealed that the icosahedral crystal structures formed as a result of element addition leads to remarkable opposite changes in the broadness and asymmetry of the fast secondary relaxation mode. Moreover, we found that the relaxation strength of fast process increases with the increasing number of these low-energy state ordered atomic structures whereas its relaxation kinetics becomes to be slowdown. The outreach of the present work provides us insight into the dynamic nature of metallic glasses and its variation with chemistry from the atomic-scale structural viewpoint.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"271 ","pages":"Article 116993"},"PeriodicalIF":5.6,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145096962","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

Anomalous ionic conductivity along the coherent Σ3 grain boundary in ThO2 ThO2中沿相干Σ3晶界的异常离子电导率

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2025-09-17 DOI: 10.1016/j.scriptamat.2025.116987

Miaomiao Jin , Jilang Miao , Marat Khafizov , Beihan Chen , Yongfeng Zhang , David H. Hurley

{"title":"Anomalous ionic conductivity along the coherent Σ3 grain boundary in ThO2","authors":"Miaomiao Jin , Jilang Miao , Marat Khafizov , Beihan Chen , Yongfeng Zhang , David H. Hurley","doi":"10.1016/j.scriptamat.2025.116987","DOIUrl":"10.1016/j.scriptamat.2025.116987","url":null,"abstract":"<div><div>Understanding oxygen diffusion along grain boundaries (GBs) is critical for controlling ionic conductivity in oxide ceramics. GBs are typically thought to enhance ionic transport due to structural disorder and increased free volume. In this study, we report an unexpected anomaly: the <span><math><mi>Σ</mi><mn>3</mn><mo>(</mo><mn>111</mn><mo>)</mo></math></span> GB in thorium dioxide (ThO<sub>2</sub>), despite its compact and coherent structure, exhibits significantly higher oxygen ionic conductivity compared to the more open GBs (e.g., Σ19). Using atomistic simulations, we revealed that the high conductivity in the Σ3 GB arises from a collective diffusion mechanism involving highly correlated atomic motion reminiscent of a superionic state. In contrast, the Σ19 GB follows conventional pipe diffusion, consistent with its more open structure. This comparison highlights that enhanced GB conductivity can occur from specific structural motifs that enable collective transport. These findings provide new guidance for designing GB-engineered oxides with targeted ionic transport properties for energy applications.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"271 ","pages":"Article 116987"},"PeriodicalIF":5.6,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145096983","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

Leveraging miscibility gap via low-temperature annealing for enhanced hard magnetic properties in laser additively processed Alnico-8H 利用混相间隙低温退火提高激光增材加工铝镍合金的硬磁性能

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2025-09-16 DOI: 10.1016/j.scriptamat.2025.116996

Saikumar Dussa , Sudip Kumar Sarkar , Sameehan S. Joshi , Rajarshi Banerjee , Narendra B. Dahotre

{"title":"Leveraging miscibility gap via low-temperature annealing for enhanced hard magnetic properties in laser additively processed Alnico-8H","authors":"Saikumar Dussa , Sudip Kumar Sarkar , Sameehan S. Joshi , Rajarshi Banerjee , Narendra B. Dahotre","doi":"10.1016/j.scriptamat.2025.116996","DOIUrl":"10.1016/j.scriptamat.2025.116996","url":null,"abstract":"<div><div>This study delves into the miscibility gap present in the phase diagram to tune nanoscale microstructure through controlled annealing for enhanced hard magnetic properties in laser-directed energy deposition fabricated Alnico-8H using a blend of constituent elemental powders. Through strategic annealing, intrinsic coercivity as high as 1392 Oe was achieved by altering conventional annealing parameters from 830 °C-10 min (935 Oe) to 650 °C-34 hrs (1392 Oe). Atom probe tomography investigations revealed that lower annealing temperature in conjunction with longer time generated a nearly three times smaller spatial dimension of α<sub>1</sub> (Fe-Co-rich) and α<sub>2</sub> (Ni-Al-Ti-rich) phases, a steeper concentration gradient between α<sub>1</sub> and α<sub>2</sub> phases, and Cu-rich (finer rod) core-shell (Ni-Al-rich)-type precipitates in higher number density (1.1 × 10<sup>22</sup>/m<sup>3</sup>). Notably, intrinsic coercivity value achieved in this research approach characteristics of conventionally thermo-magnetically processed multi-step anisotropic Alnico alloys. Thus, findings of this study present a simplified pathway for designing isotropic Alnico magnets through a simple single-step heat-treatment process.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"271 ","pages":"Article 116996"},"PeriodicalIF":5.6,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145096947","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

Enhanced electrocaloric effect in lead-free ceramics through interfacial polarization restriction 通过界面极化限制增强无铅陶瓷的电热效应

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2025-09-16 DOI: 10.1016/j.scriptamat.2025.116992

Mei Bai , Junwen Mei , Yangfei Gao , Junbo Xu , Ruirui Kang , Wenjing Qiao , Xiaopei Zhu , Jiantuo Zhao , Ziyu Li , Lei Song , Hui Wang , Yani Ye , Jianwen Li , Feng Li , Xiaojie Lou

{"title":"Enhanced electrocaloric effect in lead-free ceramics through interfacial polarization restriction","authors":"Mei Bai , Junwen Mei , Yangfei Gao , Junbo Xu , Ruirui Kang , Wenjing Qiao , Xiaopei Zhu , Jiantuo Zhao , Ziyu Li , Lei Song , Hui Wang , Yani Ye , Jianwen Li , Feng Li , Xiaojie Lou","doi":"10.1016/j.scriptamat.2025.116992","DOIUrl":"10.1016/j.scriptamat.2025.116992","url":null,"abstract":"<div><div>Electrocaloric (EC) refrigeration offers high efficiency, environmental compatibility, and miniaturization for localized and chip-level cooling. Ferroelectric polycrystalline ceramics are ideal EC candidates, but their performance is hindered by interfacial polarization arising from defects and energy barriers at grain boundaries. In this work, Bi<sup>3+</sup> was incorporated into BaTiO<sub>3</sub> (BT) to restrict interfacial polarization by reducing the activation energy mismatch between grain and grain boundary. The resulting oxygen vacancies (<em>OV</em>s) facilitate charge transfer and transition from localized to diffusive charge states. These effects enhance electric field uniformity and domain switching dynamics, leading to improved polarization response and EC performance. A maximum adiabatic temperature change (Δ<em>T</em>) of 0.98 K was achieved in the 9 mol% Bi<sub>2</sub>O<sub>3</sub>-doped BT sample at 60 kV/cm and 60 °C, with Δ<em>T</em> > 0.9 K maintained over 50–95 °C. This study offers a viable route for optimizing EC ceramics through interfacial polarization control.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"271 ","pages":"Article 116992"},"PeriodicalIF":5.6,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145096948","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

Defining structural gradient hardening through Type II back stress for heterostructured materials 通过II型背应力定义异质结构材料的结构梯度硬化

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2025-09-16 DOI: 10.1016/j.scriptamat.2025.116995

En Ma , Ting Zhu

引用次数: 0

Characterizing the phase transition behavior of ferroelectrics with multi-field constraints at nano-scale 纳米尺度下多场约束下铁电体相变行为的表征

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2025-09-15 DOI: 10.1016/j.scriptamat.2025.116991

Xuhui Lou , Pan Liu , Xu Hou , Wentao Jiang , Qingyuan Wang , Jie Wang , Xiaobao Tian , Yingwei Li

{"title":"Characterizing the phase transition behavior of ferroelectrics with multi-field constraints at nano-scale","authors":"Xuhui Lou , Pan Liu , Xu Hou , Wentao Jiang , Qingyuan Wang , Jie Wang , Xiaobao Tian , Yingwei Li","doi":"10.1016/j.scriptamat.2025.116991","DOIUrl":"10.1016/j.scriptamat.2025.116991","url":null,"abstract":"<div><div>Multiphase ferroelectric-paraelectric composite systems have emerged as promising candidates for next-generation electromechanical devices. Accurately characterizing the response of embedded ferroelectrics under coupled multi-field constraints is essential for achieving breakthroughs in broader applications. In this paper, an indirect nanoindentation methodology is developed to investigate the ferroelectric behaviors under electro-thermal-mechanical constraints. We experimentally demonstrate unprecedented phase transition-mediated superelasticity in bulk ferroelectrics above the Curie temperature, achieving a 4200 nm recoverable indentation depth under 10 mN loading at 140 °C. Thermodynamic analyses reveal multi-field constraints serve as the dominant driving force behind this unconventional behavior. Through modulating the strength of interfacial multi-field constraints in ferroelectric-paraelectric phase composite systems, this work achieves macroscopic phase transition at room temperature. Quantitative composition-property correlations of multiphase ferroelectric-paraelectric composite systems are established and provide a valuable design database for energy storage optimization. The proposed materials-by-constraint strategy provides a generalizable design framework for tailoring material functional properties.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"271 ","pages":"Article 116991"},"PeriodicalIF":5.6,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145060880","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

Ductilizing martensite in lean steel via chemical heterogeneity 贫钢中马氏体的化学非均质化

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2025-09-15 DOI: 10.1016/j.scriptamat.2025.116986

Kamran Kaboli , Chaofan Zhang , Ran Ding , Youyou Zhang , Zhigang Yang , Hao Chen

{"title":"Ductilizing martensite in lean steel via chemical heterogeneity","authors":"Kamran Kaboli , Chaofan Zhang , Ran Ding , Youyou Zhang , Zhigang Yang , Hao Chen","doi":"10.1016/j.scriptamat.2025.116986","DOIUrl":"10.1016/j.scriptamat.2025.116986","url":null,"abstract":"<div><div>Martensitic steels typically exhibit high strength but limited ductility, necessitating complex heat treatments to balance strength and ductility via the transformation induced plasticity effect. Here we demonstrate that chemical heterogeneity within martensite alone, induced through flash annealing and cooling, enhances strength and ductility in a low alloyed steel without reliance on retained austenite. The chemical heterogeneity in the initial cold-rolled ferritic + pearlitic microstructure generated structural heterogeneity in the final martensite, i.e. soft Mn-depleted martensite (MDM) with multiple variants and hard Mn-enriched martensite (MEM) with a single variant. This heterogeneity drives geometrically necessary dislocation accumulation at MDM/MEM interfaces, leading to sustained back-stress hardening during deformation. Consequently, the heterogeneous sample achieved mechanical properties that surpasses its homogeneous counterparts despite minimal retained austenite (∼2 %). This work establishes that intrinsic chemically induced structural heterogeneity in martensite can enable exceptional strength-ductility synergy, offering a streamlined alternative for advanced high-strength steels.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"271 ","pages":"Article 116986"},"PeriodicalIF":5.6,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145060881","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

Spectral analysis of light interstitial segregation energies in Ni: The role of local Cr coordination for boron and carbon Ni中光间隙偏析能的光谱分析：硼和碳的局部Cr配位的作用

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2025-09-12 DOI: 10.1016/j.scriptamat.2025.116974

Tyler D. Doležal , Rodrigo Freitas , Ju Li

{"title":"Spectral analysis of light interstitial segregation energies in Ni: The role of local Cr coordination for boron and carbon","authors":"Tyler D. Doležal , Rodrigo Freitas , Ju Li","doi":"10.1016/j.scriptamat.2025.116974","DOIUrl":"10.1016/j.scriptamat.2025.116974","url":null,"abstract":"<div><div>Understanding interstitial segregation in chemically complex alloys requires accounting for chemical and structural heterogeneity of interfaces, motivating approaches that move beyond scalar descriptors to capture the full spatial and compositional spectra of segregation behavior. Here, we introduce a spectral segregation framework that maps distributions of segregation energies for light interstitials in Ni as a function of local Cr coordination. Boron exhibits a broad, rugged energy spectrum with significant positional flexibility whereas carbon remains confined to a narrow spectrum with minimal displacement. At the free surface, Cr-rich coordination destabilizes both interstitials (e.g., positive segregation energies), in sharp contrast to the stabilizing role of Cr at the GB. This inversion establishes a natural segregation gradient that drives interstitials away from undercoordinated internal surfaces and toward GBs. These results underscore the limitations of single-valued segregation descriptors and demonstrate how a distributional approach reveals the mechanistic origins of interstitial–interface interactions in chemically heterogeneous alloys.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"271 ","pages":"Article 116974"},"PeriodicalIF":5.6,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047087","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

Giant linear magnetoresistance of self-doped SrTiO3 自掺杂SrTiO3的巨线性磁阻

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2025-09-12 DOI: 10.1016/j.scriptamat.2025.116989

Xin Xue , Xiaowen Ren , Yaner Qiu , Zhaoting Zhang , Shuanhu Wang , Kexin Jin , Hong Yan

引用次数: 0

Structure-dependent clustering-to-declustering solute segregation transitions near disconnections 结构依赖的聚类到聚类的溶质偏析转变

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2025-09-11 DOI: 10.1016/j.scriptamat.2025.116971

Oyshee Chowdhury , Rémi Dingreville , Klaus van Benthem , Chongze Hu

{"title":"Structure-dependent clustering-to-declustering solute segregation transitions near disconnections","authors":"Oyshee Chowdhury , Rémi Dingreville , Klaus van Benthem , Chongze Hu","doi":"10.1016/j.scriptamat.2025.116971","DOIUrl":"10.1016/j.scriptamat.2025.116971","url":null,"abstract":"<div><div>Grain-boundary disconnections, characterized by a step and a dislocation, are pervasive interfacial line defects that play a critical role in governing the properties and performance of nanocrystalline alloys. Although segregation of alloying elements is frequently observed at GB disconnections, the underlying mechanisms remain poorly understood, particularly at elevated temperatures and non-dilute conditions. In this study, we employ atomistic simulations to study the segregation behavior of Ag at various faulted disconnections in Cu as a model material system. Our results demonstrate a pronounced size and compactness effect on the segregation behavior: more compact faulted disconnection structures promote the formation of Ag segregation clusters due to a highly localized tensile field, whereas more spread faulted disconnection structures (<em>i.e.</em>, with wider partial dislocation spacing) exhibit much weaker clustering tendencies. With increasing temperature, Ag clustering in small disconnections initially intensifies and then disappears, indicating a thermally driven transition from clustering to declustering segregation behavior.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"271 ","pages":"Article 116971"},"PeriodicalIF":5.6,"publicationDate":"2025-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145047086","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