Materials Characterization最新文献_第6页

Development of a novel deleterious phases analysis and detection method for stainless steel 一种新的不锈钢有害相分析检测方法的建立

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-07-12 DOI: 10.1016/j.matchar.2025.115363

Ibrahim M. Ibrahim , Geoffrey Will , Xiaodong Wang , Richard Clegg , Stuart Bell

{"title":"Development of a novel deleterious phases analysis and detection method for stainless steel","authors":"Ibrahim M. Ibrahim , Geoffrey Will , Xiaodong Wang , Richard Clegg , Stuart Bell","doi":"10.1016/j.matchar.2025.115363","DOIUrl":"10.1016/j.matchar.2025.115363","url":null,"abstract":"<div><div>The integrity and performance of stainless steel can be significantly impacted by thermal aging, leading to the formation of deleterious phases such as sigma and chi phase. These deleterious phases, which are often enriched in chromium and molybdenum, affect the steel's mechanical properties by reducing ductility and toughness. Traditional methods for detecting and analysing these phases are either not consistent, costly, or lack the precision necessary for a comprehensive analysis.</div><div>This study introduces a novel Python based method for the qualitative and quantitative analysis of deleterious phases. This method is applied to thermally aged 316 L stainless steel, utilizing advanced image processing techniques, including Contrast Limited Adaptive Histogram Equalization (CLAHE) and automated particle detection algorithms, this method analyses Scanning Electron Microscopy (SEM) images to identify bright particles as an indication of phase changes. The methodology is capable of processing both individual images and batches of micrographs, providing detailed statistics on the number of particles, area percentages, average aspect ratio, circularity, particle density, spatial distribution metrics and additional particle statistics.</div><div>Results showed that the area percentage of deleterious phases increased with decreasing aging temperature and increasing time, ranging from 2 % to 13.43 %. The proposed method's reliability was validated against X-ray diffraction and ImageJ software demonstrating its accuracy and sensitivity. By offering precise, scalable, and user-friendly quantitative analyses, this methodology represents a valuable tool for industrial quality control, material optimization, and life prediction of stainless-steel components, particularly in critical energy applications.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"228 ","pages":"Article 115363"},"PeriodicalIF":4.8,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144632212","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

Microstructural evolution and grain boundary character distribution during annealing recrystallization of high-purity niobium 高纯铌退火再结晶过程中的组织演变及晶界特征分布

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-07-12 DOI: 10.1016/j.matchar.2025.115381

Jiale Wang , Aijuan Wang , Zhaobo Li , Jiuhai Zhang , Pei Zhao , Dongliang Ge , Kai Wang , Lang Wu , Gaojie Liang , Tao Yu

{"title":"Microstructural evolution and grain boundary character distribution during annealing recrystallization of high-purity niobium","authors":"Jiale Wang , Aijuan Wang , Zhaobo Li , Jiuhai Zhang , Pei Zhao , Dongliang Ge , Kai Wang , Lang Wu , Gaojie Liang , Tao Yu","doi":"10.1016/j.matchar.2025.115381","DOIUrl":"10.1016/j.matchar.2025.115381","url":null,"abstract":"<div><div>Continuous production of high-purity niobium cavities for superconducting radio frequency (SRF) applications is essential for enhancing accelerator performance. This study primarily investigates the mechanism of microstructural evolution during annealing. Cold-rolled niobium plates were annealed at 600 °C, 800 °C, and 1000 °C in a gradient process, and the characteristics of grain boundary distribution were analyzed using Electron Backscatter Diffraction (EBSD). After annealing, the niobium plates exhibited a coexisting distribution of low-angle grain boundaries (LAGBs), high-angle grain boundaries (HAGBs), and coincident site lattice boundaries (CSLBs). It was observed that increasing the annealing temperature promotes recrystallization (Rx), leading to a significant reduction in the density of geometrically necessary dislocations (GNDs), which are closely associated with the degradation of cavity performance due to flux trapping. Annealing at 800 °C achieved near-complete Rx, marking this temperature as a critical thermodynamic threshold. Spatial anisotropy analysis revealed that the Rx fraction in the normal direction (ND) was significantly higher than in the transverse direction (TD) and rolling direction (RD), with both RD and TD simultaneously forming {001} and {111} texture bands.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"228 ","pages":"Article 115381"},"PeriodicalIF":4.8,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144653916","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

An analysis of Cu-content-driven quench sensitivity in aviation Al-Cu-Li alloys 航空Al-Cu-Li合金cu含量驱动的淬火灵敏度分析

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-07-12 DOI: 10.1016/j.matchar.2025.115365

Tian-le Liu , Hui Xiang , Guang-jun Zeng , Zhan-xu Liu , Tian-yu Peng , Zhen-zhen Liu , Peng-cheng Ma , Yong-lai Chen , Dan-yang Liu , Jin-feng Li

{"title":"An analysis of Cu-content-driven quench sensitivity in aviation Al-Cu-Li alloys","authors":"Tian-le Liu , Hui Xiang , Guang-jun Zeng , Zhan-xu Liu , Tian-yu Peng , Zhen-zhen Liu , Peng-cheng Ma , Yong-lai Chen , Dan-yang Liu , Jin-feng Li","doi":"10.1016/j.matchar.2025.115365","DOIUrl":"10.1016/j.matchar.2025.115365","url":null,"abstract":"<div><div>Quenching is a critical heat treatment for aging-hardenable Al-Cu-Li alloys. However, current research on the Cu-content-driven quenching precipitation behaviors remains limited. In this paper, the quench sensitivity of Al-Cu-Li alloys with a broad range of Cu contents (3.0 wt% ∼ 4.0 wt%) was detailed investigated through a serial of interrupted quenching treatments. Furthermore, the interaction between Cu atoms and vacancy was deeply analyzed based on the first principles calculation. Analysis of the constructed Time-Temperature-Transformation (TTT) and Time-Temperature-Property (TTP) curves reveals a decreased “nose tip” temperature and a shorter incubation period with the increase in Cu content. The increased Cu content accelerates the decomposition of supersaturated solid solution (SSSS), facilitating coarse Cu-rich particles precipitation during quenching process. This enhanced quenching precipitation is primarily attributed to the decreased formation energy and stronger binding energy of the Cu-Vacancy pairs for the sample with higher Cu content, which thereby lowers the nucleation and diffusion activation energy for quenching precipitates. Furthermore, the precipitation of Cu-rich particles leads to a reduction of the aging precipitates during the subsequent aging process, especially for θ’ phase. The quenching precipitation behavior also changes the subsequent aging precipitation sequence and promotes the formation of δ’ phase. This work aims to provide experimental and theoretical basis for the fabrication process and composition design of aviation Al-Cu-Li alloys with large scale thickness.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"228 ","pages":"Article 115365"},"PeriodicalIF":4.8,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144632213","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

Microstructure and mechanical properties of Al matrix composites produced by Al-CeO2 in-situ reaction Al- ceo2原位反应制备Al基复合材料的微观结构和力学性能

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-07-11 DOI: 10.1016/j.matchar.2025.115373

Y. Liu , H.J. Hu , Y.H. Shi , C. Zhou , Y.N. Zan , M. Song , D. Wang , Q.Z. Wang , B.L. Xiao , Z.Y. Ma

{"title":"Microstructure and mechanical properties of Al matrix composites produced by Al-CeO2 in-situ reaction","authors":"Y. Liu , H.J. Hu , Y.H. Shi , C. Zhou , Y.N. Zan , M. Song , D. Wang , Q.Z. Wang , B.L. Xiao , Z.Y. Ma","doi":"10.1016/j.matchar.2025.115373","DOIUrl":"10.1016/j.matchar.2025.115373","url":null,"abstract":"<div><div>This study reports a breakthrough in designing heat-resistant Al matrix composites through a controlled Al-CeO<sub>2</sub> in-situ reaction, achieving exceptional thermal stability via a novel interfacial mutual stabilization mechanism between amorphous Al<sub>2</sub>O<sub>3</sub> (am-Al<sub>2</sub>O<sub>3</sub>) and Al<sub>11</sub>Ce<sub>3</sub>. By regulating the hot-pressing temperature (490–610 °C), it is demonstrated that the tensile strength can be modulated over a 52 % range (143–218 MPa, 350 °C), directly governed by the evolution of a unique core-shell structure where am-Al<sub>2</sub>O<sub>3</sub> layers encapsulate Al<sub>11</sub>Ce<sub>3</sub> and CeO<sub>2</sub> nanoparticles. Detailed characterization reveals that the am-Al<sub>2</sub>O<sub>3</sub> shell effectively suppresses Al<sub>11</sub>Ce<sub>3</sub> coarsening, while the Al<sub>11</sub>Ce<sub>3</sub> core chemically stabilizes the am-Al<sub>2</sub>O<sub>3</sub> against crystallization – a reciprocal stabilization effect. The composite retains >98.8 % of its original strength after annealing at 350 °C for 1000 h and 450 °C for 360 h. Concurrently, the composite displays exceptional corrosion resistance (0.03 mg·cm<sup>−3</sup> weight loss vs. 4.14 mg·cm<sup>−3</sup> for 2219 Al alloy). This work establishes a new materials design paradigm leveraging amorphous-crystalline interfacial synergy, providing a pathway to tailor high-temperature composites.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"228 ","pages":"Article 115373"},"PeriodicalIF":4.8,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144632214","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

Evaluation of biocompatible NiTi/ZrO2 joint brazed with AuSi fillers: Interfacial evolution, mechanical properties, and corrosion resistance 用AuSi填料钎焊的生物相容性NiTi/ZrO2接头的评价：界面演变、力学性能和耐腐蚀性

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-07-11 DOI: 10.1016/j.matchar.2025.115375

Xiukai Chen , Qishen Yang , Zizhao Guan , Boyang Huang , Hong Bian , Xiaoguo Song , Zhiwen Wan , Jing Wu , Zubin Chen , Danyang Lin

{"title":"Evaluation of biocompatible NiTi/ZrO2 joint brazed with AuSi fillers: Interfacial evolution, mechanical properties, and corrosion resistance","authors":"Xiukai Chen , Qishen Yang , Zizhao Guan , Boyang Huang , Hong Bian , Xiaoguo Song , Zhiwen Wan , Jing Wu , Zubin Chen , Danyang Lin","doi":"10.1016/j.matchar.2025.115375","DOIUrl":"10.1016/j.matchar.2025.115375","url":null,"abstract":"<div><div>Reliable NiTi/ZrO<sub>2</sub> joints with superior corrosion resistance were fabricated through a two-step process: Pre-metallization of ZrO<sub>2</sub> ceramics with NiTi filler, followed by brazing with an AuSi eutectic filler. The interfacial microstructure of the metallization layer and NiTi/ZrO<sub>2</sub> joints were thoroughly characterized. The influence of temperature on the interfacial microstructure, mechanical properties and corrosion resistance was more significant. As the temperature rose, the NiSiTi nanocrystalline layer went through three stages: formation, thickening, and decomposition. During this process, the amount of Si decreased, and the Ni<sub>49</sub>Si<sub>37</sub>Ti<sub>14</sub> particle phase became more evenly dispersed, and some Au(s,s) transformed into Au<sub>2</sub>Ti. Collectively, these changes in the Au(s,s) contributed to the enhancement of the joint strength. Moreover, at 460 °C for 10 min, the Au(s,s) had the least amount of phase, leading to the formation of the least amount of primary cells, and the NiTi/ZrO<sub>2</sub> joint exhibited the best corrosion resistance. The findings indicated that AuSi fills hold great potential for achieving high corrosion resistance in implantable devices.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"228 ","pages":"Article 115375"},"PeriodicalIF":4.8,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144653969","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

Influence of TiB and TiC on the material performance and structural integrity of titanium matrix composites during the dynamic deformation TiB和TiC对钛基复合材料动态变形过程中材料性能和结构完整性的影响

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-07-11 DOI: 10.1016/j.matchar.2025.115374

Zheng Li , Yu Ren , Chengwen Tan

{"title":"Influence of TiB and TiC on the material performance and structural integrity of titanium matrix composites during the dynamic deformation","authors":"Zheng Li , Yu Ren , Chengwen Tan","doi":"10.1016/j.matchar.2025.115374","DOIUrl":"10.1016/j.matchar.2025.115374","url":null,"abstract":"<div><div>Titanium matrix composites (TMCs) have emerged as promising candidates for impact-resistant components. Two TMCs, TiB/TA15 and TiC/TA15, were fabricated by laser melting deposition in this work. Their uniform and localized deformation behavior under highstrain-rate loading were investigated using a split Hopkinson pressure bar (SHPB), combining with systematic electronic micro-analysis. Both TiB whiskers and TiC particles help result in competitive dynamic strength of composites compared with reported Ti-based materials. Adiabatic shearing within the matrix alloy is the dominant failure mechanism accelerated by the reinforcements, resulting in higher localized temperature rise. The elevated temperature within the adiabatic shear bands (ASBs) facilitated the formation of dominant <span><math><mfenced><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>1</mn></mrow></mfenced></math></span> nanotwins which were first discovered in ASBs of Ti-based materials, as opposed to the predominant <span><math><mfenced><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>2</mn></mrow></mfenced></math></span> twins in remaining microdomain. The plastic deformation happened to TiC particles, in contrast to the absence of deformation in TiB whiskers, helped alleviate dislocation pile-ups and shear localization at TiC/matrix interfaces. Consequently, TiC/TA15 demonstrates relatively lower temperature in ASB and better resistance to adiabatic shear failure compared to TiB/TA15, with enhanced energy absorption (456 J·cm<sup>−3</sup>), showing its potential for high-impact applications.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"228 ","pages":"Article 115374"},"PeriodicalIF":4.8,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144663560","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

Microstructure and tensile properties of TIB2-reinforced Al-2618 thin walls produced by laser powder bed fusion 激光粉末床熔合tib2增强Al-2618薄壁的组织与拉伸性能

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-07-10 DOI: 10.1016/j.matchar.2025.115372

G. Lupi , L. Mariotti , A. Mistrini , J. Larsson , L. Patriarca , R. Casati

{"title":"Microstructure and tensile properties of TIB2-reinforced Al-2618 thin walls produced by laser powder bed fusion","authors":"G. Lupi , L. Mariotti , A. Mistrini , J. Larsson , L. Patriarca , R. Casati","doi":"10.1016/j.matchar.2025.115372","DOIUrl":"10.1016/j.matchar.2025.115372","url":null,"abstract":"<div><div>This study focuses on enhancing the processability and mechanical properties of the Al-2618 Al alloy by functionalizing powder with TiB<sub>2</sub>. Four different methods have been used to add TiB<sub>2</sub> particles to the Al alloy powder: i) low-pressure plasma, ii) low-energy and iii) high-energy mechanical mixing, and iv) pre-alloying by gas-atomization. Comprehensive characterization of composite powders was conducted, followed by Laser Powder Bed Fusion (LPBF) manufacturing of samples. High-density printed composites were achieved with all powder feedstocks, with homogeneous dispersion of TiB<sub>2</sub> and absence of cracks. Borides effectively promoted heterogeneous nucleation of α-Al phase, suppressing epitaxial growth and leading to a fine equiaxed microstructure. Upon preliminary study on different heat-treatment routes (T6 and T5), tensile tests aided by Digital Image Correlation (DIC) have been performed to assess the mechanical properties. Results show significant enhancements in yield and ultimate strengths post-heat treatments. Despite lower ductility, pre-alloyed powder exhibited superior mechanical performance due to nano-metric TiB<sub>2</sub> formation.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"228 ","pages":"Article 115372"},"PeriodicalIF":4.8,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144622786","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

Suction casting-cooling gradient mediated grain orientation in Fe2NiCoCr(VN)0.5 high-entropy alloys for strength-plasticity synergy Fe2NiCoCr(VN)0.5高熵合金吸铸冷却梯度介导晶粒取向的强度塑性协同效应

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-07-10 DOI: 10.1016/j.matchar.2025.115348

Zhiyu Feng , Lianning Li , Xinlong Zhang , Bingzhao Wu , Zixian Xiong , Chunyu Zhao , Lei Zhang

{"title":"Suction casting-cooling gradient mediated grain orientation in Fe2NiCoCr(VN)0.5 high-entropy alloys for strength-plasticity synergy","authors":"Zhiyu Feng , Lianning Li , Xinlong Zhang , Bingzhao Wu , Zixian Xiong , Chunyu Zhao , Lei Zhang","doi":"10.1016/j.matchar.2025.115348","DOIUrl":"10.1016/j.matchar.2025.115348","url":null,"abstract":"<div><div>This study investigates the effects of suction casting parameters on the microstructure and mechanical properties of Fe<sub>2</sub>NiCoCr(VN)<sub>0.5</sub> high-entropy alloys (HEAs). By adjusting copper mold diameters (7 mm, 6 mm, 5 mm, and 4 mm), gradient cooling rates were established, linking solidification induced microstructural evolution to mechanical performance. Reducing the mold diameter (and thus increasing the cooling rate) enhances the degree of grain preferred orientation. The 5 mm sample exhibits a dual microstructure: columnar grains with [001] and [101] crystallographic orientations coexisting with equiaxed grains. Transmission electron microscopy characterization of the 5 mm alloy reveals a metastable dislocation network near the fracture zone, contributing to exceptional strength-plasticity synergy with a yield strength of 416 MPa, ultimate tensile strength of 950 MPa, and elongation of 62 %. Compared to the 7 mm alloy, the 5 mm alloy shows increases of 42.9 % in yield strength, 52 % in ultimate tensile strength, and 44.2 % in elongation. Molecular dynamics simulations demonstrate that equiaxed and columnar grains jointly govern dislocation slip behavior through multi-slip activation, enhanced dislocation storage, and regulated grain interactions. This mechanism achieves a balance between homogeneous plastic deformation and localized stress distribution. The work elucidates the role of cooling rate in microstructural evolution and establishes a framework for optimizing HEA performance through solidification parameter control.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"228 ","pages":"Article 115348"},"PeriodicalIF":4.8,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144623495","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

Ultrafine elongated grain structure for enhanced cryogenic impact toughness of low-alloy steel 提高低合金钢低温冲击韧性的超细拉长组织

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-07-10 DOI: 10.1016/j.matchar.2025.115371

Bo Yang , Kuanyuan Fan , Baoxi Liu , Zhichao Luo , Fuxing Yin

{"title":"Ultrafine elongated grain structure for enhanced cryogenic impact toughness of low-alloy steel","authors":"Bo Yang , Kuanyuan Fan , Baoxi Liu , Zhichao Luo , Fuxing Yin","doi":"10.1016/j.matchar.2025.115371","DOIUrl":"10.1016/j.matchar.2025.115371","url":null,"abstract":"<div><div>This study investigates the cryogenic impact toughness of low-alloy steels engineered via bi-axial forging and rolling, emphasizing the roles of ferrite volume fraction, microstructural refinement, and delamination-induced plasticity. Three steels were fabricated: F650 (forged at 650 °C), R730 (rolled at 730 °C), and R770 (rolled at 770 °C). Among them, R730 exhibited the highest impact toughness (252 J at −196 °C), outperforming R770 (134 J) and F650 (9 J). Unlike 9Ni steels, where high toughness stems from retained austenite, our results demonstrate that increasing the ferrite volume fraction and refining the grain structure significantly enhance impact toughness in the crack-arrester orientation. EBSD analyses revealed bamboo-like ultrafine elongated grains in the rolled steels, which promoted crack deflection and delamination, transforming the fracture mode to bending-dominated and enabling extensive plastic deformation. These findings demonstrate that optimizing ferrite fraction and grain morphology provides a robust route to achieve superior cryogenic toughness in low-alloy steels.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"228 ","pages":"Article 115371"},"PeriodicalIF":4.8,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144632211","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

Achieving exceptionally high strength across a wide temperature range in a near-eutectic L12/B2 composite alloy via nano-sized η phase 通过纳米级η相，在宽温度范围内实现近共晶L12/B2复合合金的超高强度

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-07-10 DOI: 10.1016/j.matchar.2025.115358

Mengqi Gao , Donghui Wen , Zhaowen Huang , Fengyu Kong , Haojie Kong , Wenli Song , Qiang Li , Cong Zhang , Anding Wang , Chain-Tsuan Liu

{"title":"Achieving exceptionally high strength across a wide temperature range in a near-eutectic L12/B2 composite alloy via nano-sized η phase","authors":"Mengqi Gao , Donghui Wen , Zhaowen Huang , Fengyu Kong , Haojie Kong , Wenli Song , Qiang Li , Cong Zhang , Anding Wang , Chain-Tsuan Liu","doi":"10.1016/j.matchar.2025.115358","DOIUrl":"10.1016/j.matchar.2025.115358","url":null,"abstract":"<div><div>Excellent temperature-bearing capacity over a wide temperature rasnge is critical for elevated-temperature application. In this study, via a unique nano-particle precipitation hardening strategy, a novel near-eutectic Ni-19Al-15Ti alloy multi-composited with L1<sub>2</sub> and nano-sized η phase strengthened B2 intermetallics is developed, to improve the yield strength (YS) and ductility at room-medium temperature as well as to combine the superior microstructural stability and castability. The nano-sized η particles densely precipitated in the B2 phase can effectively strengthen the multi-fold composite structure, leading to the high hardness of 650 HV and super-high YS of about 1900 MPa at room-temperature. The samples also exhibit superior mechanic properties at high temperature, e.g., high YS of 790 MPa at 800 °C and compressive strain larger than 50 %. The superior mechanical properties can be attributed to the solution and precipitation strengthening effects as well as the synergistic deformation of composite structure. These results provide a paradigm for developing alloys with an excellent synergy of mechanic properties, temperature-bearing capability and castability.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"228 ","pages":"Article 115358"},"PeriodicalIF":4.8,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144605328","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