Scripta Materialia最新文献_第2页

Iron as a microstructural architect in ATI 425 via DED-LB 铁作为一个微结构建筑师在ATI 425通过d - lb

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2026-04-15 Epub Date: 2026-02-02 DOI: 10.1016/j.scriptamat.2026.117199

Shenglu Lu, Tiantian Wang, Shudong Luo, Tingting Song, Milan Brandt, Ma Qian

{"title":"Iron as a microstructural architect in ATI 425 via DED-LB","authors":"Shenglu Lu, Tiantian Wang, Shudong Luo, Tingting Song, Milan Brandt, Ma Qian","doi":"10.1016/j.scriptamat.2026.117199","DOIUrl":"10.1016/j.scriptamat.2026.117199","url":null,"abstract":"<div><div>Laser-based directed energy deposition (DED-LB) overcomes the long-standing barrier to iron alloying in titanium—β-fleck formation—unlocking new compositional space for alloy design. Here, we exploit this capability to engineer the α-β Ti alloy ATI 425 (≤1.8 wt.% Fe) with Fe additions up to 4.5 wt.%. Our findings reveal two previously unrecognised roles of Fe: (i) driving the development of a pronounced {<span><math><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>2</mn></mrow></math></span>} texture component with high Schmid factors across all primary slip systems, and (ii) promoting Type 2 α-variant misorientation (<span><math><mrow><mrow><mo>[</mo><mrow><mn>11</mn><mover><mn>2</mn><mo>¯</mo></mover><mn>0</mn></mrow><mo>]</mo></mrow><mo>/</mo><msup><mn>60</mn><mo>∘</mo></msup></mrow></math></span>) that favour transformation strain self-accommodation. At total Fe contents ≥4.5 wt.%, Fe additionally facilitates a columnar-to-equiaxed transition, notably without disrupting the [001]‖Z texture. Across the composition range, Fe progressively refines both prior-β grains and α–β lamellae. Based on ω-phase formation and tensile response, a new practical limit of ∼3.0 wt.% total Fe content is identified for DED-LB–processed ATI 425, which significantly enhances strength while preserving good ductility.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"276 ","pages":"Article 117199"},"PeriodicalIF":5.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171346","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

U1 Raman band as a signature of uranium interstitials in irradiated UO2 UO2辐照下铀间隙的U1拉曼谱带特征

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2026-04-15 Epub Date: 2026-02-04 DOI: 10.1016/j.scriptamat.2026.117213

A. Georgesco , C. Onofri , J.-P. Crocombette , F. Bruneval , D. Drouan , G. Gutierrez

引用次数: 0

Solute/interphase interaction and deviation from equilibrium during ferrite growth: Nanoscale diagnostics 铁氧体生长过程中溶质/相间相互作用和平衡偏差：纳米级诊断

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2026-04-15 Epub Date: 2026-01-28 DOI: 10.1016/j.scriptamat.2026.117195

Olha Nakonechna , Frédéric Danoix , Helena Zapolsky , Mohamed Gouné

{"title":"Solute/interphase interaction and deviation from equilibrium during ferrite growth: Nanoscale diagnostics","authors":"Olha Nakonechna , Frédéric Danoix , Helena Zapolsky , Mohamed Gouné","doi":"10.1016/j.scriptamat.2026.117195","DOIUrl":"10.1016/j.scriptamat.2026.117195","url":null,"abstract":"<div><div>A significant deviation in phase fractions from equilibrium is highlighted during γ-austenite to α-ferrite transformation at 625 °C of a Fe-C-Mn model alloy. To understand it, representative α/γ interfaces were analysed by atom probe tomography for different holding times, after selection assisted by electron backscattered diffraction (EBSD). Most of the interfaces exhibit strong Mn segregation within the interface, and some were found to be in paraequilibrium (PE) mode. Individual interface dynamics were revealed, and the observed growth sequence in PE mode, segregation at the α/γ interface, and partitioning of Mn into austenite are analyzed using the normalized interface velocity. This latter, rather than the intrinsic velocity of the interface, is shown to be the marker of solute/interface interaction. The original deviation of the ferrite phase fraction from equilibrium is associated with the velocity-dependent segregation effects. The proposed analysis provides clarification of the mechanisms and modes of ferrite growth in steels.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"276 ","pages":"Article 117195"},"PeriodicalIF":5.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146076359","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

Deformation induced kink band formation and ω-to-β phase reversion in a cold rolled metastable β Ti-10Mo alloy 冷轧亚稳态Ti-10Mo合金变形诱导扭结带形成和ω-to-β相逆转

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2026-04-15 Epub Date: 2026-01-31 DOI: 10.1016/j.scriptamat.2026.117194

Deepak V Pillai , Tirthesh Ingale , Fan Sun , Liang Qi , Rajarshi Banerjee , Yufeng Zheng

{"title":"Deformation induced kink band formation and ω-to-β phase reversion in a cold rolled metastable β Ti-10Mo alloy","authors":"Deepak V Pillai , Tirthesh Ingale , Fan Sun , Liang Qi , Rajarshi Banerjee , Yufeng Zheng","doi":"10.1016/j.scriptamat.2026.117194","DOIUrl":"10.1016/j.scriptamat.2026.117194","url":null,"abstract":"<div><div>The deformation mechanism of a metastable β Ti-10Mo (wt.%) alloy during cold rolling was investigated using scanning electron microscopy, transmission electron microscopy, and aberration-corrected scanning transmission electron microscopy. While being typically considered a TRIP alloy, {332}<sub>β</sub><113><sub>β</sub> deformation twinning was identified as the dominant mechanism, accompanied by nanoscale stress-induced ω and αʺ martensite. Additionally, nanoscale <110><sub>β</sub>-type deformation induced kink bands formed via lattice rotation around <110><sub>β</sub> axis due to pileups of {112}<sub>β</sub><111><sub>β</sub> dislocations, effectively relaxing localized strain. Inside primary deformation kink bands, secondary <110><sub>β</sub>-type kink bands developed together with ω-free zones, wherein pre-formed athermal ω reverted to β phase. It is speculated that {112}<sub>β</sub><111><sub>β</sub> dislocation slip within primary kink bands promote secondary kink bands and facilitate the atomic shuffling along {112}<sub>β</sub> planes leading to the ω-to-β phase reversion. These findings provide new insights into the role of kink band formation in strain accommodation and phase reversion in ductile metastable β titanium alloys.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"276 ","pages":"Article 117194"},"PeriodicalIF":5.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146076429","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

Role of reinforcement-dominated strengthening and thermally activated accommodation/damage in the tensile performances of AlFeVSi-B2O3 composites 增强主导强化和热活化调节/损伤对AlFeVSi-B2O3复合材料拉伸性能的影响

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2026-04-15 Epub Date: 2026-02-09 DOI: 10.1016/j.scriptamat.2026.117215

Mengyu Li , Tong Gao , Guiliang Liu , Shushuai Liu , Xiangfa Liu

引用次数: 0

Improved strength-ductility with bimodal microstructure composed of kink-strengthening grains in a layer-structured Mg-Al-Y alloy 层状组织Mg-Al-Y合金中由扭结强化晶粒组成的双峰组织提高了强度-塑性

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2026-04-15 Epub Date: 2026-02-02 DOI: 10.1016/j.scriptamat.2026.117198

Han Chen , Kakeru Kubota , Daisuke Egusa , Yuto Ito , Michiaki Yamasaki , Eiji Abe

{"title":"Improved strength-ductility with bimodal microstructure composed of kink-strengthening grains in a layer-structured Mg-Al-Y alloy","authors":"Han Chen , Kakeru Kubota , Daisuke Egusa , Yuto Ito , Michiaki Yamasaki , Eiji Abe","doi":"10.1016/j.scriptamat.2026.117198","DOIUrl":"10.1016/j.scriptamat.2026.117198","url":null,"abstract":"<div><div>We report that a mille-feuille-type layer-structured Mg-Al-Y alloy shows a remarkably improved strength-ductility balance after applying a hot-extrusion process, which successfully generates a unique bimodal microstructure consisting of fine recrystallized grains and large kink-deformed grains. The strength originates primarily from the work-hardened large grains composed of a large number of kink boundaries (KBs), while the ductility is mainly due to the recrystallized grains that are almost free from defects. On the contrary to the significant solute-segregations at the KBs observed so far for the most kink-strengthened Mg-transition-metal-rare-earth alloys, the present Mg-Al-Y alloy exhibits notably weak solute-segregations, hence suggesting that the solute-segregation is not an essential factor to realize the KB strengthening effect. The solute-segregation behaviors as well as the layer-structure stability are discussed based on solute-pair interaction energy calculations and solute diffusion kinetics during the initial heat treatment and the hot-extrusion process.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"276 ","pages":"Article 117198"},"PeriodicalIF":5.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171349","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-resolution STEM/EDS characterization of defect cluster complexes in reactor pressure vessel steel model alloys 反应堆压力容器钢模型合金中缺陷团簇复合物的高分辨率STEM/EDS表征

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2026-04-15 Epub Date: 2026-01-29 DOI: 10.1016/j.scriptamat.2026.117197

Yusuke Noshi , Koki Onaka , Moe Ishiwaki , Manato Kakizawa , Ryoya Ishigami , Tomokazu Yamamoto , Kazuhiro Yasuda , Ken-ichi Fukumoto

{"title":"High-resolution STEM/EDS characterization of defect cluster complexes in reactor pressure vessel steel model alloys","authors":"Yusuke Noshi , Koki Onaka , Moe Ishiwaki , Manato Kakizawa , Ryoya Ishigami , Tomokazu Yamamoto , Kazuhiro Yasuda , Ken-ichi Fukumoto","doi":"10.1016/j.scriptamat.2026.117197","DOIUrl":"10.1016/j.scriptamat.2026.117197","url":null,"abstract":"<div><div>Dislocation loop complexes with solute atoms were observed in this study using a high-resolution STEM/EDS analysis technique. In Fe-1.3Mn-0.6Ni alloy, Mn segregated along dislocation lines, and Ni segregated to the centers of dislocation loops. Mn, predominantly diffusing as mixed dumbbells with SIA, were driven to segregate toward tensile stress regions outside the dislocation edges, appearing near the dislocation lines. Conversely, when Ni diffused via the vacancy dragging mechanism, they were driven to segregate toward compressive stress regions inside the dislocation loop edges, manifesting as segregation at the centers of the loops. In contrast, in Fe-1.3Mn-0.6Ni-0.2Si alloy, Si addition inhibited this Ni segregation. This occurred because Si atoms preferentially interacted with point defects, thereby restricting the available diffusion pathways for Ni segregation. Furthermore, as Si is thermodynamically stable in solid solution, it did not undergo spontaneous segregation; instead, it indirectly inhibited Ni segregation by competing for point defect diffusion vehicles.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"276 ","pages":"Article 117197"},"PeriodicalIF":5.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146076357","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

Simultaneous boost in plasticity and thermoelectric performance of Ag2Te via Ag nanotwins induced by HPHT 高温高温诱导银纳米孪晶同时提高Ag2Te的塑性和热电性能

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2026-04-15 Epub Date: 2026-02-03 DOI: 10.1016/j.scriptamat.2026.117205

Erzhuo Jiang , Hongtao Wang , Kailiang Fang , Zhuoming Xia , Chenyang Xiao , Xiaobin Feng , Bo Duan , Guodong Li , Pengcheng Zhai , Qingjie Zhang

引用次数: 0

Origin of strain localization near prior austenite grain boundary in martensitic steel: Role of chemical and dislocation structures 马氏体钢在奥氏体晶界附近应变局部化的起源：化学和位错组织的作用

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2026-04-15 Epub Date: 2026-01-31 DOI: 10.1016/j.scriptamat.2026.117201

Wujun Yin , Fabien Briffod , Jiyun Kang , Haoyu Hu , Kazuhiko Yamazaki , Takayuki Shiraiwa , Manabu Enoki

{"title":"Origin of strain localization near prior austenite grain boundary in martensitic steel: Role of chemical and dislocation structures","authors":"Wujun Yin , Fabien Briffod , Jiyun Kang , Haoyu Hu , Kazuhiko Yamazaki , Takayuki Shiraiwa , Manabu Enoki","doi":"10.1016/j.scriptamat.2026.117201","DOIUrl":"10.1016/j.scriptamat.2026.117201","url":null,"abstract":"<div><div>Premature failure near prior austenite grain boundaries (PAGBs) limits the ductility of lath-martensitic steels, yet the mechanistic origin of this vulnerability remains unclear due to their complex hierarchical microstructure. This study integrates atom probe tomography, electron channeling contrast imaging, and high-resolution digital image correlation to directly correlate atomic-scale chemical segregation with local dislocation activity and strain evolution near PAGBs. The results reveal that habit-plane in-lath dislocations dominate deformation in fine-lath martensite adjacent to PAGBs, preferentially activated according to the Schmid law and facilitated by their long mean free path. Intense carbon segregation at PAGBs, together with nanoscale carbide precipitates in their vicinity, forms a strong barrier to dislocation motion, producing substantial dislocation accumulation near the boundary. This interaction drives severe strain localization, providing direct nanoscale evidence linking chemical heterogeneity to localized mechanical response near the PAGBs.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"276 ","pages":"Article 117201"},"PeriodicalIF":5.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171344","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

Solid -state dewetting in Pd/a-Ge bilayers Pd/a-Ge双分子层的固态脱湿

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2026-04-15 Epub Date: 2026-01-29 DOI: 10.1016/j.scriptamat.2026.117188

Bärbel Krause , Gregory Abadias , David Babonneau

引用次数: 0