Journal of Alloys and Compounds最新文献

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Tailoring breakdown behaviour in BST-xMgO ceramics for energy storage applications 用于储能应用的BST-xMgO陶瓷的定制击穿行为
IF 6.3 2区 材料科学
Journal of Alloys and Compounds Pub Date : 2025-08-04 DOI: 10.1016/j.jallcom.2025.182737
Aman Malasi, Nibedan Nanda, Sujata Swain, Pawan Kumar
{"title":"Tailoring breakdown behaviour in BST-xMgO ceramics for energy storage applications","authors":"Aman Malasi,&nbsp;Nibedan Nanda,&nbsp;Sujata Swain,&nbsp;Pawan Kumar","doi":"10.1016/j.jallcom.2025.182737","DOIUrl":"10.1016/j.jallcom.2025.182737","url":null,"abstract":"<div><div>In this study, Ba₀.₆₅Sr₀.₃₅TiO₃–xMgO ceramics with x = 0, 1, 3, and 5 wt% (abbreviated as BST, BST-1M, BST-3M, and BST-5M, respectively) were successfully synthesized via the conventional solid-state route. XRD study confirmed the phase purity with tetragonal perovskite structure with space group P4mm, while FESEM study revealed the enhanced grain growth and reduced porosity in BST-1M and BST-3M samples, which was found to be in correlation with density measurement, where density increased from 5.35 gm/cc to 5.40 gm/cc in BST-1M. Dielectric study showed good thermal stability upto 45° C under TCC performance, whereas Yamada model provided the best dielectric fitting to present experimental data. Ferroelectric analysis confirmed improved polarization and breakdown strength with the increase of MgO addition, which was attributed to MgO-induced grain enhancement and increased bandgap. Notably, BST-1M ceramics exhibited high total energy density (∼3.1 J/cm³), and BST-3M ceramics exhibited excellent recoverable energy (W <sub>rec</sub>∼1.28 J/cm³) with ∼73.56 % efficiency at E<sub>b</sub> ∼ 190 kV/cm. Breakdown strength (E<sub>b</sub>) increased from ∼ 120 kV/cm ( BST) to ∼ 220 kV/cm (BST-5M). Optimum W<sub>rec</sub>/E<sub>b</sub> ratio of BST-1M, BST-3M ceramics further demonstrated their superior performance at lower fields, making them suitable for embedded capacitors, flexible electronics, and low-power tunable RF devices.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1038 ","pages":"Article 182737"},"PeriodicalIF":6.3,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144766658","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
Fabrication and ablation behavior of ZrB2-SiC/ZrB2-TiB2-SiC gradient coating on carbon/carbon composites 碳/碳复合材料上ZrB2-SiC/ZrB2-TiB2-SiC梯度涂层的制备及烧蚀行为
IF 6.3 2区 材料科学
Journal of Alloys and Compounds Pub Date : 2025-08-04 DOI: 10.1016/j.jallcom.2025.182734
Shaopu Liu , Yaxin Wang , Ping Gu , Zhuang Ma , Yanbo Liu , Shizhen Zhu
{"title":"Fabrication and ablation behavior of ZrB2-SiC/ZrB2-TiB2-SiC gradient coating on carbon/carbon composites","authors":"Shaopu Liu ,&nbsp;Yaxin Wang ,&nbsp;Ping Gu ,&nbsp;Zhuang Ma ,&nbsp;Yanbo Liu ,&nbsp;Shizhen Zhu","doi":"10.1016/j.jallcom.2025.182734","DOIUrl":"10.1016/j.jallcom.2025.182734","url":null,"abstract":"<div><div>ZrB<sub>2</sub>-SiC coatings show promise for thermal protection systems (TPS) in carbon/carbon (C/C) composites but are limited by thermal expansion mismatch. Here, a ZrB<sub>2</sub>-TiB<sub>2</sub>-SiC transition layer was fabricated via pack cementation to enhance the compatibility of an atmospheric plasma sprayed (APS) ZrB<sub>2</sub>-SiC coating. The ZrB<sub>2</sub>-SiC/ZrB<sub>2</sub>-TiB<sub>2</sub>-SiC coating demonstrated superior cyclic ablation resistance at 2670 ℃ compared to conventional Zr-based coatings, attributed to (i) Rapid densification of ZrO<sub>2</sub> in the outer layer, combined with the self-healing capability of SiO<sub>2</sub>. (ii) The graded ceramic distribution in the transition layer alleviates the mismatch in coefficient of thermal expansion both externally and internally. (iii) The novel Zr-Ti-Si-O glass scale, characterized by low oxygen diffusivity and reduced vapor pressure, reduces gas generation within the transition layer, mitigating internal stress and impact on the outer layer. These findings provide fundamental insights and highlight the potential of ZrB<sub>2</sub>-SiC/ZrB<sub>2</sub>-TiB<sub>2</sub>-SiC coating for C/C composites in extreme environments.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1038 ","pages":"Article 182734"},"PeriodicalIF":6.3,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144770588","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
Submicrostructure evolution of high-phosphorus nickel barrier/seed layers deposited by electroless plating on SiO2/Si substrates for 3D integration applications 用于3D集成的SiO2/Si衬底化学镀高磷镍屏障/种子层的亚微观结构演变
IF 6.3 2区 材料科学
Journal of Alloys and Compounds Pub Date : 2025-08-04 DOI: 10.1016/j.jallcom.2025.182686
N.S. Buylov , V.V. Pobedinskiy , E.A. Ilina , D.L. Goloshchapov , D.N. Nesterov , N.V. Stolpovskaya , A.I. Chukavin , E.S. Kersnovskiy , M.V. Grechkina , P.L. Parmon , K.V. Zolnikov , P.V. Seredin
{"title":"Submicrostructure evolution of high-phosphorus nickel barrier/seed layers deposited by electroless plating on SiO2/Si substrates for 3D integration applications","authors":"N.S. Buylov ,&nbsp;V.V. Pobedinskiy ,&nbsp;E.A. Ilina ,&nbsp;D.L. Goloshchapov ,&nbsp;D.N. Nesterov ,&nbsp;N.V. Stolpovskaya ,&nbsp;A.I. Chukavin ,&nbsp;E.S. Kersnovskiy ,&nbsp;M.V. Grechkina ,&nbsp;P.L. Parmon ,&nbsp;K.V. Zolnikov ,&nbsp;P.V. Seredin","doi":"10.1016/j.jallcom.2025.182686","DOIUrl":"10.1016/j.jallcom.2025.182686","url":null,"abstract":"<div><div>The objective of our research was to obtain high-phosphorus nickel (El-Ni) layers coatings formed through chemical deposition on oxidized silicon (SiO<sub>2</sub>/Si) substrates, as well as the evolution of their submicrostructure under the influence of annealing. The study involved several steps in the fabrication of samples that closely approximate the technological processes used in the production of TSV for interconnections. The approach proposed in this work enables an assessment of the feasibility of implementing high-phosphorus El-Ni coatings as barrier and seed layers in the technological steps of heterogeneous 3D integration at a qualitatively new level.</div><div>Using a combination of advanced microscopic analysis (SEM and AFM) in their combination with those ones which are sensitive to electronic structure (XPS, USXES) and crystalline structure analysis, we provide an assessment of the spatial structure of the spherical grains that compose the nickel coating with average grain sizes of approximately 100 nm and 200 nm. High-temperature treatment led to a reduction in the mean square roughness of the coating's surface by approximately 20 %, resulting in an RMS value of 90.7 nm, along with the formation of an oxidized NiO layer approximately 50 nm thick.</div><div>The structure of the grains in the nickel coating can be described using the nucleus-shell model, where the nucleus contains a higher concentration of nickel atoms, while the shell is enriched with phosphorus atoms. The nickel oxide layer on the surface of the electroplated nickel coating inhibits further electrochemical deposition of copper. EDS mapping across the layered ECD-Cu/El-Ni/SiO2/Si structure, both before and after repeated annealing at 200 °C, did not reveal any evidence of copper diffusion into the substrate.</div><div>The results regarding the reproducibility and uniformity of thickness for high-phosphorus El-Ni coatings, as well as the preservation of the amorphous structure following thermal treatment, confirm the promising potential of these coatings for TSV technology.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1038 ","pages":"Article 182686"},"PeriodicalIF":6.3,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144771679","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 behaviors of the laser powder-bed fused WMoTaNbV refractory high-entropy alloy 激光粉末床熔接WMoTaNbV难熔高熵合金的组织与力学行为
IF 6.3 2区 材料科学
Journal of Alloys and Compounds Pub Date : 2025-08-04 DOI: 10.1016/j.jallcom.2025.182731
Bang Xiao, Guangyu Yang, Ming Wei, Jian Wang
{"title":"Microstructure and mechanical behaviors of the laser powder-bed fused WMoTaNbV refractory high-entropy alloy","authors":"Bang Xiao,&nbsp;Guangyu Yang,&nbsp;Ming Wei,&nbsp;Jian Wang","doi":"10.1016/j.jallcom.2025.182731","DOIUrl":"10.1016/j.jallcom.2025.182731","url":null,"abstract":"<div><div>WMoTaNbV refractory high-entropy alloy was fabricated utilizing laser powder-bed fusion. The Calculation of Phase Diagram was applied to model the phase constituents of the alloy. The as-fabricated WMoTaNbV refractory high-entropy alloy exhibits a single BCC phase. The as-fabricated microstructure experienced a variation in power, accompanied by the evolution of porosity and solidification cracking, while the chemical composition is somewhat uniform. The better mechanical properties of the as-built WMoTaNbV refractory high-entropy alloy are achieved at a manufacturing power of 250 W and a scanning rate of 550 mm/s. The hardness and the ultimate compressive strength are 744 HV and 1382 MPa, respectively. The solidification cracking and abnormal grain growth are two negative factors that can influence the mechanical properties of the as-built refractory high-entropy alloy.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1038 ","pages":"Article 182731"},"PeriodicalIF":6.3,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144766656","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
1D WS2 nanorods/2D WO3 nanoplates heterostructured arrays for boosting photoelectrochemical water splitting 一维WS2纳米棒/二维WO3纳米板异质结构阵列促进光电化学水分解
IF 6.3 2区 材料科学
Journal of Alloys and Compounds Pub Date : 2025-08-04 DOI: 10.1016/j.jallcom.2025.182715
Quping Zhu , Zhehui Yan , Yiding Wang , Jinneng Wang , Dong Hao , Luping Zhu
{"title":"1D WS2 nanorods/2D WO3 nanoplates heterostructured arrays for boosting photoelectrochemical water splitting","authors":"Quping Zhu ,&nbsp;Zhehui Yan ,&nbsp;Yiding Wang ,&nbsp;Jinneng Wang ,&nbsp;Dong Hao ,&nbsp;Luping Zhu","doi":"10.1016/j.jallcom.2025.182715","DOIUrl":"10.1016/j.jallcom.2025.182715","url":null,"abstract":"<div><div>A hierarchical 1D WS₂ nanorod/2D WO₃ nanoplate heterostructured array photoelectrode was synthesized <em>via</em> a combined hydrothermal-solvothermal strategy, demonstrating exceptional photoelectrochemical (PEC) performance for solar-driven water splitting. Compared to pristine WO₃, the optimized hierarchical heterostructures (WO₃/WS₂-0.75) achieved a 2.8-fold enhancement in photocurrent (1.85 <em>vs</em>. 0.66 mA cm⁻² at 1.23 V <em>vs</em>. RHE), a prolonged electron lifetime (1608 <em>vs</em>. 237 ms), enhanced applied bias photon-to-current efficiency (ABPE)(0.21 % <em>vs</em>. 0.07 % at 1.0 V <em>vs</em>. RHE) and improved incident photon-to-current efficiency (IPCE)(60.2 % at 380 nm <em>vs</em>. 6.5 % at 350 nm). The superior performance of WO₃/WS₂-0.75 compared to other WS₂-modified counterparts can be attributed to its optimized WS₂ coverage and favorable aspect ratio, synergistically contributing to enhanced light harvesting, improved charge separation/transport kinetics, and suppressed charge recombination. These improvements result from the synergistic effects of a type-II band alignment and hierarchical heterostructures. This cost-effective synthesis method offers a scalable platform for designing multifunctional heterostructures with tailored optoelectronic properties, highlighting significant potential for advancing solar energy conversion and environmental remediation technologies.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1038 ","pages":"Article 182715"},"PeriodicalIF":6.3,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144766668","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
Intermittent cooling aging: A new method of combining intermittent and non-isothermal aging to enhance the comprehensive properties of 7075 aluminium alloy 间歇冷却时效:采用间歇时效与非等温时效相结合的方法提高7075铝合金的综合性能
IF 6.3 2区 材料科学
Journal of Alloys and Compounds Pub Date : 2025-08-04 DOI: 10.1016/j.jallcom.2025.182706
Kunze Li, Yuezhu Wang, Ruiming Su, Guanglong Li
{"title":"Intermittent cooling aging: A new method of combining intermittent and non-isothermal aging to enhance the comprehensive properties of 7075 aluminium alloy","authors":"Kunze Li,&nbsp;Yuezhu Wang,&nbsp;Ruiming Su,&nbsp;Guanglong Li","doi":"10.1016/j.jallcom.2025.182706","DOIUrl":"10.1016/j.jallcom.2025.182706","url":null,"abstract":"<div><div>In order to simultaneously enhance both the mechanical properties and corrosion resistance of the 7075 aluminium alloy, this paper proposes an intermittent cooling aging treatment to solve this problem, which combines intermittent aging with non-isothermal cooling aging. The effects of different cooling rates before and after interruption on the comprehensive properties and microstructure morphology of 7075 aluminium alloy were studied by hardness test, tensile property test, friction and wear performance test, intergranular corrosion (IGC) test, electrochemical corrosion test and transmission electron microscopy (TEM) observation. The results show that when the cooling rates before and after the intermittent are 10 °C/h and 30 °C/h, respectively, the alloy achieves its highest hardness value of 193.2 HV, the highest tensile strength is 612.2 MPa, and the minimum weight loss is 6.6 mg. The minimum intergranular corrosion depth is 23.3 μm, and the minimum self-corrosion current is 0.43 × 10<sup>−3</sup> mA/cm<sup>2</sup>. In addition, the matrix precipitation phase of the alloy has the smallest average size, the highest volume fraction, and the best precipitation strengthening effect. The grain boundary precipitates are parallel and intermittently distributed, independently rounded, and the precipitate free zone width is 66.7 nm. It effectively obstructs the anodic corrosion channel, slows down the corrosion progression, and improves the corrosion resistance.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1038 ","pages":"Article 182706"},"PeriodicalIF":6.3,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144770585","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 cooling-rate-dependent influence of Ag addition on the quench sensitivity of AlZnMg alloys 银的加入对AlZnMg合金淬火敏感性的影响
IF 6.3 2区 材料科学
Journal of Alloys and Compounds Pub Date : 2025-08-04 DOI: 10.1016/j.jallcom.2025.182724
X. Yuan , C.Y. Li , Y.C. Wu , Y.T. He , W.Q. Ming , Z. Zhang
{"title":"The cooling-rate-dependent influence of Ag addition on the quench sensitivity of AlZnMg alloys","authors":"X. Yuan ,&nbsp;C.Y. Li ,&nbsp;Y.C. Wu ,&nbsp;Y.T. He ,&nbsp;W.Q. Ming ,&nbsp;Z. Zhang","doi":"10.1016/j.jallcom.2025.182724","DOIUrl":"10.1016/j.jallcom.2025.182724","url":null,"abstract":"<div><div>Large-scale integral structural components have been widely used in contemporary industrial applications, which demands aluminum alloys with low quench sensitivity to ensure uniform properties across thickness sections. The beneficial influence of Ag on mechanical properties of AlZnMg alloys has been well established, while its impact on the quench sensitivity remains poorly understood. This study reveals a cooling-rate-dependent reversal of quench sensitivity in Ag-modified AlZnMg alloys. For air-quenched specimens (∼5 K/s), the Ag-containing alloy exhibits lower quench sensitivity, superior hardness, tensile and yield strength compared to the base alloy. In contrast, this trend reversed at slower cooling rates (∼0.05 K/s), with the Ag-containing alloy showing higher quench sensitivity and inferior mechanical properties. Detailed microstructural analysis suggests this inversion originates from the competitive formation between the quench-induced and age-induced precipitates, since Ag can not only stabilize the supersaturated solid solution, but also simultaneously promote the formation of both. Our findings imply that precise cooling rate control during quenching processes is essential, when designing Ag-modified AlZnMg alloys for critical structural applications.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1038 ","pages":"Article 182724"},"PeriodicalIF":6.3,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144767112","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
Effect of temperature on host emission and ratiometric thermometry in Dy(III) doped tungstate double perovskite 温度对Dy(III)掺杂钨酸双钙钛矿中寄主发射及比例测温的影响
IF 6.3 2区 材料科学
Journal of Alloys and Compounds Pub Date : 2025-08-04 DOI: 10.1016/j.jallcom.2025.182733
Naresh Degda , Nimesh Patel , S. Masilla Moses Kennedy , A. Princy , M. Srinivas
{"title":"Effect of temperature on host emission and ratiometric thermometry in Dy(III) doped tungstate double perovskite","authors":"Naresh Degda ,&nbsp;Nimesh Patel ,&nbsp;S. Masilla Moses Kennedy ,&nbsp;A. Princy ,&nbsp;M. Srinivas","doi":"10.1016/j.jallcom.2025.182733","DOIUrl":"10.1016/j.jallcom.2025.182733","url":null,"abstract":"<div><div>Non-contact ratiometric thermometers owing to thermally coupled energy levels (TCLs) are in high demand due to higher precision and temperature sensitivity. Here, Dy<sup>3+</sup> activated Mg<sub>3</sub>WO<sub>6</sub> down-converting phosphors were investigated for temperature sensing within 303–498 K. Dy<sup>3+</sup> concentration was varied from 0.5 to 2.5 mol%, and all the phosphors were synthesized via the solid-state reaction at 1200 °C. When excited at 278 nm, the phosphors exhibited tungstate host emission at 473 nm along with Dy<sup>3+</sup> emissions at 490 nm (<sup>4</sup>F<sub>9/2</sub>-<sup>6</sup>H<sub>15/2</sub>) and 575 nm (<sup>4</sup>F<sub>9/2</sub>-<sup>6</sup>H<sub>13/2</sub>), wherein host emission dominated the emission spectrum. The phosphors examined for luminescence decay displayed a reduction in decay lifetime with increasing Dy<sup>3+</sup> concentration. The temperature-dependent photoluminescence (TDPL) spectra obtained within 303–498 K showed steady decrease in PL intensity of host emission and <sup>4</sup>F<sub>9/2</sub>-<sup>6</sup>H<sub>15/2</sub> (490 nm) emission due to thermal quenching. In contrast, the PL intensity of <sup>4</sup>F<sub>9/2</sub>-<sup>6</sup>H<sub>13/2</sub> (575 nm) transition initially increased before eventually decreasing. This behavior is collectively attributed to the energy transfer efficiency from host emission to activator (Dy<sup>3+</sup>) at higher temperatures and the thermal quenching effect on <sup>4</sup>F<sub>9/2</sub>-<sup>6</sup>H<sub>13/2</sub> Dy<sup>3+</sup> transition. Utilizing fluorescence intensity ratio (FIR) of TCLs (here 490 nm and 575 nm), the thermometry features were examined and discussed. The highest relative sensitivity is obtained to be 1.91 %K<sup>−1</sup> at 303 K, whereas the absolute sensitivity was calculated to be 2.07 %K<sup>−1</sup> at 473 K, indicating the suitability of the phosphor in temperature sensing within 303–498 K. Moreover, experiments on the repeatability of FIR confirm the reliability of the studied optical thermometer.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1038 ","pages":"Article 182733"},"PeriodicalIF":6.3,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144766669","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
Mechanisms of abnormal grain growth in a powder metallurgy nickel-based superalloy 粉末冶金镍基高温合金中晶粒异常长大的机理
IF 6.3 2区 材料科学
Journal of Alloys and Compounds Pub Date : 2025-08-04 DOI: 10.1016/j.jallcom.2025.182757
Yan Wang , Jingjun He , Gang Tan , Zi Wang , Liming Tan , Feng Liu
{"title":"Mechanisms of abnormal grain growth in a powder metallurgy nickel-based superalloy","authors":"Yan Wang ,&nbsp;Jingjun He ,&nbsp;Gang Tan ,&nbsp;Zi Wang ,&nbsp;Liming Tan ,&nbsp;Feng Liu","doi":"10.1016/j.jallcom.2025.182757","DOIUrl":"10.1016/j.jallcom.2025.182757","url":null,"abstract":"<div><div>For nickel-based powder metallurgy (PM) superalloy components manufactured by isothermal forging, abnormal grain growth (AGG) frequently occurred during the subsequent solution heat treatment (SHT). Once abnormal large grains (ALGs) formed, it was extremely challenging to eliminate them, which significantly impaired the service performance of the component. This study focused on the AGG behavior of hot-deformed PM nickel-based superalloy. The correlation between the formation of ALGs and deformation conditions during SHT was explored. The influencing factors for occurrence of AGG in the alloy were analyzed. Combining the interrupted SHT experiments, the formation process and underlying mechanisms of ALGs were discussed. The results indicated that AGG during SHT predominantly occurred at the conditions of lower deformation temperatures, higher strain rates, and larger strains. Stored energy (SE) played a crucial role in the occurrence of AGG. When the SE within the deformed matrix was higher, certain recrystallized grains with advantageous grain boundary migration underwent selective growth, causing the formation of ALGs. AGG was also related to the uneven dissolution of γ' precipitates during SHT, resulting in inhomogeneous pinning and solute dragging effects on the grains across different regions of the alloy. Consequently, the regions where γ' precipitates were completely dissolved were more prone to AGG phenomenon. Quantitative calculations on the driving force of grain growth and pinning force of γ' precipitates revealed that the SE differential between deformed grains and recrystallized grains was the main factor for the occurrence of AGG in the alloy. During SHT, some undistorted recrystallized grains overcame the pinning effect caused by γ' precipitates under the drive of SE, rapidly grew during the holding stage, and formed size advantages, ultimately leading to the formation of ALGs.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1038 ","pages":"Article 182757"},"PeriodicalIF":6.3,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144767111","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
Synergistic effect of MWCNT and CoFe₂O₄ in ethylene-octene copolymer foam for electromagnetic interference shielding and thermal management MWCNT与CoFe₂O₄在乙烯-辛烯共聚物泡沫中的协同电磁干扰屏蔽和热管理作用
IF 6.3 2区 材料科学
Journal of Alloys and Compounds Pub Date : 2025-08-04 DOI: 10.1016/j.jallcom.2025.182718
Jasomati Nayak , Sreeja Nath Choudhary , Aparajita Pal , Shovan Biswas , Soumen Giri , Pallab Banerji , Narayan Chandra Das
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