Chang Liu, Na Wu, Bin Li, Zhou Wang, Lili Wu, Zhihui Zeng, Jiurong Liu
{"title":"Facile manufacturing of carbon nanotube/ZIF-67-derived cobalt composite aerogel with high-efficiency electromagnetic wave absorption","authors":"Chang Liu, Na Wu, Bin Li, Zhou Wang, Lili Wu, Zhihui Zeng, Jiurong Liu","doi":"10.1016/j.jmst.2024.08.065","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.08.065","url":null,"abstract":"Developing high-efficiency electromagnetic wave (EMW) absorbers by designing dielectric/magnetic components and microstructure in a straightforward, scalable method is highly desirable yet challenging. Here, we introduce a novel hierarchical composite aerogel-based EMW absorber composed of conductive carbon nanotubes (CNTs) and magnetic metal-organic framework (MOF) derivatives, integrated with sustainable cellulose nanofibers (CNF) derived carbon. This composite was prepared using a scalable freeze-casting followed by carbonization approach. Freeze casting enabled the creation of porous monoliths with high specific surface areas and customizable pore sizes and porosities, crucial for enhancing EMW reflection and scattering. Carbonization enhanced composite conductivity and stabilized the cobalt (Co)/carbon nanoparticles derived from ZIF-67 within the carbon matrix. CNF-derived carbon facilitated the efficient integration of ZIF-derived Co nanoparticles and CNTs, resulting in a robust 3D aerogel structure. The synergistic effects of CNT conductive paths and Co nanoparticles' magnetic losses provided an efficient route to enhance EMW absorption. Moreover, the creation of numerous heterogeneous interfaces augmented polarization losses, significantly enhancing EMW loss capability. Remarkably, the composite achieved outstanding EMW absorption, with a minimum reflection loss of -71.03 dB at a filling ratio of merely 10 wt.% and an effective absorption bandwidth of 4.64 GHz, comparable to leading EMW absorbers reported to date.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"10 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142330053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jianxi Liu, Yifan Fang, Yang Ou, Xiaowei Shi, Yaoming Zhang, Qiang Chen, Lei Li, Feng Zhou, Weimin Liu
{"title":"Synergistic anti-corrosion and anti-wear of epoxy coating functionalized with inhibitor-loaded graphene oxide nanoribbons","authors":"Jianxi Liu, Yifan Fang, Yang Ou, Xiaowei Shi, Yaoming Zhang, Qiang Chen, Lei Li, Feng Zhou, Weimin Liu","doi":"10.1016/j.jmst.2024.08.063","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.08.063","url":null,"abstract":"The synergy between corrosion protection and wear resistance is an effective strategy for the development of multifunctional coating to withstand complex working conditions. This study reports an epoxy resin coating filled with benzotriazole loaded metal-organic frameworks (BTA-MOFs) functionalized graphene oxide nanoribbons (GONR) that exhibit active anti-corrosion, act as a barrier to corrosive ion, and enhance wear resistance. The GONR@BTA-MOFs composite is synthesized through chemically etching multi-walled carbon nanotubes and subsequent electrostatic self-assembly corrosion inhibitors loaded MOFs onto the GONR. The composite demonstrates improved compatibility with epoxy resins compared to carbon nanotubes. The anti-corrosion performance of the composite coating is investigated using electrochemical impedance spectroscopy. After immersing in a 3.5 wt.% NaCl solution for 25 d, the alternating current impedance of the composite coating is three orders of magnitude higher than that of pure epoxy resin. Simultaneously, the controlled release of the corrosion inhibitor retards the deterioration of the coating after localized damage occurrence, which functions as active corrosion protection. The GONR@BTA-MOFs/EP composite coating exhibits the highest corrosion potential of -0.188 V and the lowest corrosion current of 3.162 × 10<sup>−9</sup> A cm<sup>−2</sup>) in the Tafel test. Tribological studies reveal a reduction in the friction coefficient from 0.62 to 0.08 after incorporating GONR@BTA-MOFs in the coating, with the wear volume being seven times lower than that of pure epoxy resin. The excellent lubrication effect of the nanomaterials reduces the coefficient of friction of the coating, thereby improving the abrasion resistance of the coating. The synergy between the self-lubrication of the two-dimensional layered fillers and the corrosion resistance of the smart inhibitor containers suggests a promising strategy for enhancing the performance of epoxy resins under complex working conditions.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"218 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142329276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shuang Liu, Lina Li, Tao Yang, Enhui Wang, Xiangtao Yu, Yanglong Hou, Zhentao Du, Sheng Cao, Kuo-Chih Chou, Xinmei Hou
{"title":"Enhanced overall water splitting by morphology and electronic structure engineering on pristine ultrathin metal-organic frameworks","authors":"Shuang Liu, Lina Li, Tao Yang, Enhui Wang, Xiangtao Yu, Yanglong Hou, Zhentao Du, Sheng Cao, Kuo-Chih Chou, Xinmei Hou","doi":"10.1016/j.jmst.2024.09.014","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.09.014","url":null,"abstract":"Metal-organic frameworks (MOFs) have caused extensive attention attributed to their widespread applications including electrocatalysis by virtue of their distinctive structural characteristics. However, the direct application of pristine MOFs as bifunctional electrocatalysts is quite challenging due to their insufficient active sites and poor electrical conductivity. In this research, the ultrathin tri-metal (Fe, Co, and V) doped FeCoV-NiMOF nanosheet arrays were prepared through a facile hydrothermal method. Benefiting from the distinctive ultrathin (1.5 nm) nanosheet arrays and electronic structure reconfiguration induced by heteroatom doping, the prepared FeCoV-NiMOF displays the low overpotentials of 238, 309, and 408 mV for oxygen evolution reaction (OER) and 144, 255, and 349 mV for hydrogen evolution reaction (HER) at the current densities of 10, 100, and 1000 mA cm<sup>−2</sup>, respectively, outperforming the vast majority of previously reported bifunctional pristine MOFs. The electrolytic cell utilizing FeCoV-NiMOF as both cathode and anode requires just 1.61 V to attain 10 mA cm<sup>−2</sup> and displays superior stability of 100 h at 100 mA cm<sup>−2</sup>. In the anion exchange membrane electrolyzer, as-prepared FeCoV-NiMOF needs a low cell voltage of 2.16 V at 500 mA cm<sup>−2</sup> for effective overall water splitting, demonstrating its substantial potential as bifunctional electrodes for H<sub>2</sub> production. The viable and efficient strategy in this study exhibits great prospects to enrich the exploration of bifunctional MOF-based electrocatalysts with superior performance for renewable energy conversion.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"54 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142329181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sisi Tang, Li Li, Jinlong Su, Yuan Yuan, Yong Han, Jinglian Fan
{"title":"Unveiling micro-scale mechanisms of in-situ silicon alloying for tailoring mechanical properties in titanium alloys: Experiments and computational modeling","authors":"Sisi Tang, Li Li, Jinlong Su, Yuan Yuan, Yong Han, Jinglian Fan","doi":"10.1016/j.jmst.2024.08.064","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.08.064","url":null,"abstract":"Titanium-silicon (Ti-Si) alloy system shows significant potential for aerospace and automotive applications due to its superior specific strength, creep resistance, and oxidation resistance. For Si-containing Ti alloys, the sufficient content of Si is critical for achieving these favorable performances, while excessive Si addition will result in mechanical brittleness. Herein, both physical experiments and finite element (FE) simulations are employed to investigate the micro-mechanisms of Si alloying in tailoring the mechanical properties of Ti alloys. Four typical states of Si-containing Ti alloys (solid solution state, hypoeutectoid state, near-eutectoid state, hypereutectoid state) with varying Si content (0.3–1.2 wt.%) were fabricated via in-situ alloying spark plasma sintering. Experimental results indicate that in-situ alloying of 0.6 wt.% Si enhances the alloy's strength and ductility simultaneously due to the formation of fine and uniformly dispersed Ti<sub>5</sub>Si<sub>3</sub> particles, while higher content of Si (0.9 and 1.2 wt.%) results in coarser primary Ti<sub>5</sub>Si<sub>3</sub> agglomerations, deteriorating the ductility. FE simulations support these findings, highlighting the finer and more uniformly distributed Ti<sub>5</sub>Si<sub>3</sub> particles contribute to less stress concentration and promote uniform deformation across the matrix, while agglomerated Ti<sub>5</sub>Si<sub>3</sub> particles result in increased local stress concentrations, leading to higher chances of particle fracture and reduced ductility. This study not only elucidates the micro-mechanisms of in-situ Si alloying for tailoring the mechanical properties of Ti alloys but also aids in optimizing the design of high-performance Ti alloys.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"25 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142329272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Fast diffusion and stable topotactic reaction in single crystal conversion anode","authors":"Weili Liu, Tian Xu, Shouguo Wang, Guanglin Xia, Dalin Sun, Xuebin Yu","doi":"10.1016/j.jmst.2024.09.013","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.09.013","url":null,"abstract":"Conversion electrodes typically have high theoretical specific capacity, but mostly suffer large structural changes during charge/discharge and result in poor cycling stability. The optimization of the polycrystalline materials is the mostly used strategy, however, these polycrystalline materials are intrinsically vulnerable to grain-boundary (intergranular) fracture caused by the anisotropic volume change during sodiation/desodiation, resulting in rapid impedance growth and capacity decay. Herein, we propose an alternative pathway to design single-crystal materials as potential conversion anodes. As an example, SnO<sub>2</sub> with different crystallinities is successfully synthesized via solvothermal methods and compared to determine the implications of different crystallinity for the electrochemical properties of conversion anodes. It is demonstrated that the single-crystal SnO<sub>2</sub> not only has faster Na<sup>+</sup> diffusion dynamics but also maintains structural stability via topotactic reaction. Further optimization of the electron conduction and structural robustness is realized by uniformly covering a graphitic carbon shell on the surface of single-crystal SnO<sub>2</sub> nanosheets. The modified single-crystal SnO<sub>2</sub> exhibits a high reversible capacity of 436.2 mA h g<sup>–1</sup> and maintains a high capacity of 257.1 mA h g<sup>-1</sup> and remarkable capacity retention of about 98.9% after 9000 cycles at 5000 mA g<sup>-1</sup>. The deep understandings of the topotactic reaction in single crystal conversion anode in this work provide a theoretical foundation and new direction for further developing electrode materials with excellent electrochemical performance, especially high rate capabilities, and long cyclability.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"27 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142325618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Compositional fluctuation and local chemical ordering in multi-principal element alloys","authors":"Evan Ma, Jun Ding","doi":"10.1016/j.jmst.2024.09.008","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.09.008","url":null,"abstract":"The recently emerging multi-principal element alloys (MPEAs) are attracting widespread attention. This naturally raises a materials science question as to what is new in the microstructure of these “high-entropy” alloys (HEAs) that makes them different from well-documented traditional (dilute) solid solutions. Here we illustrate that the concentrated chemical make-up towards equi-molar compositions in these multi-principal element solid solutions MPEA brings forth an unusually high population density of chemical inhomogeneities at length scales from sub-nanometers to a few nanometers. Specifically, a spatial variation in local composition, and in local chemical order (LCO), constitutes an inherent structural feature. In this article we define these various inhomogeneities and discuss the challenges facing their identification while explaining their relations with, and (sometimes subtle) differences from, the previously known inhomogeneities including the compositional coring in cast ingots, chemical short-range order and (precursor of) precipitates in conventional solid solutions. The potential impact is discussed in an outlook at the end, to provide a future perspective on this sub-field.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"25 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142321390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Peng He, Meiqian Fu, Fangqian Wang, Yushan Zhang, Chen Li, Jiening Feng, Lianwen Deng, Jun Yan
{"title":"Unlocking versatile capabilities: Mixed-valence decavanadate aerogels for boosting radar, infrared, and thermal stealth","authors":"Peng He, Meiqian Fu, Fangqian Wang, Yushan Zhang, Chen Li, Jiening Feng, Lianwen Deng, Jun Yan","doi":"10.1016/j.jmst.2024.08.057","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.08.057","url":null,"abstract":"Multifunctional compatible stealth materials have emerged as the focal point of contemporary protection technology research and vanadium-based nanomaterials play a pivotal role in the development of advanced stealth materials. Here, a compatible stealth aerogel is successfully synthesized by employing mixed-valence decavanadate as the vanadium oxide (VO<em><sub>x</sub></em>) molecular model. Ultralight {V<sup>Ⅳ</sup>V<sup>V</sup><sub>9</sub>}/MXene aerogel (0.0429 g cm<sup>–3</sup>) exhibits exceptional radar stealth performance with a minimal reflection loss (RL<sub>min</sub>) of −57.74 dB (99.9998% EMW absorption) and a significantly superior radar cross section reduction value of 26.77 dB m<sup>2</sup>. The aerogel's exceptional properties, including a low infrared (IR) emissivity (0.479) and a low thermal conductivity of (32.30 mW m<sup>–1</sup> K<sup>–1</sup>), are crucial for enabling compatibility with IR and thermal stealth technologies. The presence of a mixed-valence polyoxovanadate cluster leads to an increase in the Schottky barrier and enhances magnetic properties, consequently boosting interfacial polarization and contributing to magnetic losses during electromagnetic wave (EMW) absorption. Consequently, altering the number of valence electrons significantly enhances the compatible stealth capabilities. These findings contribute significantly to our comprehension of how microstructure impacts EMW absorption processes and provide a basis for further research into the development of VO<em><sub>x</sub></em>-based compatible stealth materials.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"97 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142324898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xueyuan Qiu, Xiao Han, Baorui Dong, Meng Zong, Runtong Zhou, Teng Zhang, Pan Wang, Chang Guo, Hejun Li, Jianhua Hao
{"title":"Multi-stimulus responsive actuator with weldable and robust MXene-CNTs hybrid films","authors":"Xueyuan Qiu, Xiao Han, Baorui Dong, Meng Zong, Runtong Zhou, Teng Zhang, Pan Wang, Chang Guo, Hejun Li, Jianhua Hao","doi":"10.1016/j.jmst.2024.08.062","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.08.062","url":null,"abstract":"Stimulus-responsive actuators are novel functional devices capable of sensing external stimuli and exhibiting specific deformation responses. MXene, owing to its unique 2D structure and efficient energy conversion efficiency, has bridged the gap in traditional devices and shown great potential for multiple stimulus-responsive actuators. However, the drawbacks of pure MXene films, including susceptibility to oxidation and vulnerability to shear stress, hinder their applications. Through composite modification and structural design strategies, a three-layer structured MXene-carbon nanotubes hybrid film (tHCM) is fabricated, exhibiting a tensile strength and fracture strain of 153.8 MPa and 4.65%, respectively, representing improvements of 598.4% and 226.8% compared to the initial film. Meanwhile, the film maintains excellent stability demonstrating the enhancing effects of hydrogen bonds and densely packed structure. The hybrid films demonstrate unique and facile welding features due to splicing properties, enabling the formation of complex configurations. In terms of electro-/photo-thermal conversion performance, the hybrid film can reach a reasonably high temperature of 250 ℃ at low voltage (2.5 V) and 110.6 ℃ under 150 mW cm<sup>–2</sup> infrared light. Leveraging the thermal expansion mismatch between tHCM and thermoplastic films, an integrated, flexible, and weldable actuator with unique electro/photo-response is developed, and various biomimetic driving applications, particularly, the light-mediated hierarchical transmission and precise motion along predetermined trajectory are realized. This work not only provides an effective strategy for modifying MXene composite films but also advances the design of novel actuators, offering broad application prospects in fields such as stimulus-responsive actuated robots and cargo transportation.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"9 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142324894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Chao Ding, Huibin Wu, Dong Liu, Robert O. Ritchie, Na Gong, Kun Li, Lawrence E. Murr, Gang Niu
{"title":"Achieving unexpected strength and ductility synergies in heterogeneous metastable lamellar steels","authors":"Chao Ding, Huibin Wu, Dong Liu, Robert O. Ritchie, Na Gong, Kun Li, Lawrence E. Murr, Gang Niu","doi":"10.1016/j.jmst.2024.09.012","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.09.012","url":null,"abstract":"High-strength steel with excellent ductility is pivotal for the formability and safety of critical structural components. Here, a heterogeneous metastable lamellar steel, composed of alternating lamellar ferrite and austenite aligned with the rolling direction, was developed through an innovative combination of warm rolling and immediate annealing processes. This novel design overcomes the strength-ductility trade-off, achieving high ultimate tensile strength (∼1.2 GPa) and excellent uniform elongation (∼78%), pushing the product of ultimate tensile strength and uniform elongation to an ultra-high level (> 90 GPa %). The high tensile strength is attributed to ultrafine lamellar grains and significant work hardening induced by the hetero-deformation and transformation-induced plasticity (TRIP) effect. The exceptional ductility is a result of the synergy of multiple plasticity mechanisms, including (i) the inherent plastic deformation ability of lamellar microstructure and the hetero-deformation-induced hardening in the early deformation period, (ii) the persistent TRIP effect induced by the lamellar austenite with high mechanical stability and the elimination of strain localization caused by prolonged strain hardening due to the coordinated deformation of lamellar austenite and ferrite in the middle deformation period, and (iii) delamination cracking in the late deformation period. This approach adopted in current work offers a straightforward and economically feasible pathway for fabricating advanced high-strength steel with superior performance.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"22 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142317244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A novel strategy for ingot cogging without homogenization: Dynamical recrystallization and nucleation mechanisms associated with as-cast dendrites of nickel-based superalloys","authors":"B.C. Xie, Y.W. Luo, Z.T. Wang, Q.Q. Meng, Y.Q. Ning, M.W. Fu","doi":"10.1016/j.jmst.2024.08.061","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.08.061","url":null,"abstract":"Since the as-cast microstructure benefits dynamic recrystallization (DRX) nucleation, the present research is focused on the microstructure evolution associated with the dendrites and precipitates during the thermal deformation of an ingot without homogenization treatment aiming at exploring a new efficient strategy of ingot cogging for superalloys. The as-cast samples were deformed at the sub-solvus temperature, and the DRX evolution from dendritic arms (DAs) to inter-dendritic regions (IDRs) was discussed based on the observation of the fishnet-like DRX microstructures and the gradient of DRX grain size at IDRs. The difference in the precipitates at DAs and IDRs played an essential role during the deformation and DRX process, which finally resulted in very different microstructures in the two areas. A selective strain-induced grain boundary bulging (SIGBB) mechanism was found to function well and dominate the DRX nucleation at DAs. The grain boundary was able to migrate and bulge to nucleate on the condition that the boundary was located at DAs and had a great difference in dislocation density between its opposite sides at the same time. As for DRX nucleation at IDRs, the particle-stimulated nucleation (PSN) mechanism played a leading role, and the progressive subgrain rotation (PSR) and geometric DRX were two important supplementary mechanisms. The dislocation accumulation around the coarse precipitates at IDR resulted in progressive orientation rotation, which would generate DRX nuclei once the maximum misorientation there was sufficient to form a high-angle boundary with the matrix. The PSR or geometric DRX functioned at the severely elongated IDRs at the later stage of deformation, depending on the thickness of the elongated IDRs. The uniform microstructure was obtained by the deformation without homogenization and the subsequent annealing treatment. The smaller strain, the lower annealing temperature, and the much shorter soaking time requested in the above process lead to a smaller risk of cracking and a lower consumption of energy during the ingot-cogging process.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"65 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142317245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}