Smart Materials in Manufacturing最新文献

Creation of heavily La-doped SrTiO3 thermoelectric films achieved by freeze-dry pulsated orifice ejection method and laser powder bed fusion 冻干脉冲孔喷射法和激光粉末床熔合制备重la掺杂SrTiO3热电薄膜

Smart Materials in Manufacturing Pub Date : 2025-01-01 DOI: 10.1016/j.smmf.2025.100077

Myeonggyun Kang , Zhenxing Zhou , Weiwei Zhou, Naoyuki Nomura

{"title":"Creation of heavily La-doped SrTiO3 thermoelectric films achieved by freeze-dry pulsated orifice ejection method and laser powder bed fusion","authors":"Myeonggyun Kang , Zhenxing Zhou , Weiwei Zhou, Naoyuki Nomura","doi":"10.1016/j.smmf.2025.100077","DOIUrl":"10.1016/j.smmf.2025.100077","url":null,"abstract":"<div><div>Achieving both fine grain sizes and high doping levels simultaneously holds great promise for improving the dimensionless figure of merit (zT) of oxide thermoelectric materials; however, this remains a global challenge. This study presents a pioneering example of fabricating heavily La-doped SrTiO<sub>3</sub> films by leveraging the unique characteristics of laser powder bed fusion (L-PBF). A novel freeze-dry pulsated orifice ejection method (FD-POEM) was used to prepare spherical SrTiO<sub>3</sub>–La<sub>2</sub>O<sub>3</sub> composite powders with a narrow size distribution, homogeneous element distribution, and high laser absorptivity. Owing to the high processing temperature and rapid solidification of the L-PBF process, the La<sub>2</sub>O<sub>3</sub> nanoparticles decomposed and dissolved in the lattice of the cubic perovskite SrTiO<sub>3</sub>. Consequently, the thermoelectric SrTiO<sub>3</sub> film achieved a high La doping concentration of 36.7 mol% and a nanoscale grain size of approximately 700 nm, surpassing conventional methods. Moreover, the La-doped SrTiO<sub>3</sub> film, approximately 10 μm thick, was closely deposited onto a Mo substrate and exhibited excellent thermal stability at 1073 K, making it well-suited for high-temperature thermoelectric applications.</div></div>","PeriodicalId":101164,"journal":{"name":"Smart Materials in Manufacturing","volume":"3 ","pages":"Article 100077"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143759226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effects of TiN nanoparticle incorporation on the microstructure and wear resistance of additively manufactured CoCrMoW alloys TiN纳米颗粒掺入对CoCrMoW合金组织和耐磨性的影响

Smart Materials in Manufacturing Pub Date : 2025-01-01 DOI: 10.1016/j.smmf.2025.100078

Canjuan Xiao , Wenting Jiang , Yi Huang , Song Ni

{"title":"The effects of TiN nanoparticle incorporation on the microstructure and wear resistance of additively manufactured CoCrMoW alloys","authors":"Canjuan Xiao , Wenting Jiang , Yi Huang , Song Ni","doi":"10.1016/j.smmf.2025.100078","DOIUrl":"10.1016/j.smmf.2025.100078","url":null,"abstract":"<div><div>To enhance the wear resistance of CoCrMoW alloys, this study used laser powder bed fusion (LPBF) to fabricate TiN nanoparticle-incorporated composites. By conducting microstructure characterization and wear resistance testing, the intricate relationship between microstructure and wear behavior was elucidated. The LPBF-fabricated samples presented dual-phase structures comprising face-centered cubic and hexagonal close-packed phases along with numerous stacking faults. The TiN particles were uniformly distributed in the sample with a 1 wt% addition. However, as the additive content increased, the TiN particles grew, and the interparticle spacing correspondingly decreased. Notably, robust interfacial bonding existed between the TiN nanoparticles and the matrix material. The interface between the TiN particles and the matrix displayed a semicoherent nature characterized by a specific orientation relationship: [001] <sub>TiN</sub>//[011]<sub>γ</sub> and (020)<sub>TiN</sub>//(111)<sub>γ</sub>. Compared to the nonincorporated sample, the incorporated samples demonstrated reduced friction coefficients and wear rates. A comparative analysis of the nonincorporated and incorporated samples’ wear behaviors revealed that oxidation wear predominantly characterized the nonincorporated sample, which displayed significant plastic deformation along with fragmented debris and loose oxides. In contrast, the incorporated samples presented relatively smooth wear surfaces where abrasive wear emerged as the primary mechanism. These findings underscore enhancements in tribological properties due to TiN incorporation and offer valuable insights into its fundamental behavior during wear.</div></div>","PeriodicalId":101164,"journal":{"name":"Smart Materials in Manufacturing","volume":"3 ","pages":"Article 100078"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143679050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Machine learning prediction of surface roughness in sustainable machining of AISI H11 tool steel aisih11工具钢可持续加工中表面粗糙度的机器学习预测

Smart Materials in Manufacturing Pub Date : 2025-01-01 DOI: 10.1016/j.smmf.2025.100075

Balasuadhakar A. , Thirumalai Kumaran S. , Uthayakumar M.

{"title":"Machine learning prediction of surface roughness in sustainable machining of AISI H11 tool steel","authors":"Balasuadhakar A. , Thirumalai Kumaran S. , Uthayakumar M.","doi":"10.1016/j.smmf.2025.100075","DOIUrl":"10.1016/j.smmf.2025.100075","url":null,"abstract":"<div><div>Surface roughness prediction ensures high product quality, boosts manufacturing efficiency, and aids in effective tool life management. In this study, surface roughness optimization and prediction in the end milling of AISI H11 die steel were examined under three cooling conditions: dry milling, Minimum Quantity Lubrication (MQL), and Nano Fluid Minimum Quantity Lubrication (NMQL). The experiments were designed using a Taguchi L27 orthogonal array, with cutting speed, feed, and cooling environments as the variables. Surface roughness, the performance output parameter, was analyzed through Taguchi Signal-to-Noise (S/N) analysis. The dataset's diversity and robustness were further enhanced using the Gaussian Data Augmentation (GDA) technique, ensuring improved predictive accuracy of the Machine Learning (ML) models. Advanced machine ML models, including Decision Tree(DT), XGBoost (XGB), Support Vector Regression (SVR), CATBoost, AdaBoost Regression (ABR), and Random Forest Regression (RFR), were developed, with hyperparameters optimized using Grid Search Cross Validation. The ideal cutting parameters were identified as a cutting speed of 40 m/min, a feed rate of 0.01 mm/rev, and utilization of the NMQL cooling environment. The ML models, including DT, ABR, RFR, and CATBoost, demonstrate exceptional performance by achieving accuracy rates above 90 % and determinant coefficient (R<sup>2</sup>) greater than 0.9. Remarkably, the CATBoost model exhibited heightened precision, boasting 90.8 % accuracy, a R<sup>2</sup> of 0.94, a mean absolute error (MAE) of 0.05, a mean squared error (MSE) of 0.005, a root mean squared error (RMSE) of 0.07, and a mean absolute percentage error (MAPE) of 9.17.</div></div>","PeriodicalId":101164,"journal":{"name":"Smart Materials in Manufacturing","volume":"3 ","pages":"Article 100075"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bioactive and fatigue-resistant Ti–Ta alloy by additive manufacturing for orthopedic applications 生物活性和抗疲劳的钛合金增材制造矫形应用

Smart Materials in Manufacturing Pub Date : 2025-01-01 DOI: 10.1016/j.smmf.2025.100086

Qian Liu , Yiming Zhang , Wenliang Chen , Peidong He , Ye Tian , Yang Liu , Yiming Dou , Hanming Bian , Jingzhou Yang , Qiang Yang , Xiaopeng Li

{"title":"Bioactive and fatigue-resistant Ti–Ta alloy by additive manufacturing for orthopedic applications","authors":"Qian Liu , Yiming Zhang , Wenliang Chen , Peidong He , Ye Tian , Yang Liu , Yiming Dou , Hanming Bian , Jingzhou Yang , Qiang Yang , Xiaopeng Li","doi":"10.1016/j.smmf.2025.100086","DOIUrl":"10.1016/j.smmf.2025.100086","url":null,"abstract":"<div><div>Despite advancements, metallic materials for load-bearing medical applications still face ongoing challenges. Titanium (Ti) and tantalum (Ta) are widely used due to their mechanical and biological properties, but both have limitations: Ta is highly bioactive but heavy and expensive, while Ti is lightweight but less bioactive. Metal additive manufacturing (AM) offers a new pathway for the design of porous metallic biomaterials. This study developed a 50 wt% Ti–Ta alloy for orthopedic implants using in situ alloying capability from laser powder bed fusion (LPBF) AM to combine Ti's lightweight with Ta's bioactivity. Extensive evaluations, including fatigue testing, wettability analysis, and in vitro and in vivo biocompatibility assessments, revealed the superior fatigue and biocompatibility performance of LPBF-fabricated Ti–Ta alloys compared to pure Ti. The alloy demonstrated exceptional fatigue resistance, enduring up to 10<sup>5</sup> cycles at 110 % of yield strength, and achieved a 40 % bone–implant contact rate 12 weeks after implantation in rabbit femurs. For the first time, this study uncovered the critical influence of LPBF process parameters (i.e., laser power and scan speed) on the microstructures, mechanical properties, and biocompatibility of Ti–Ta alloys. These findings validate LPBF's capability to produce bioactive, mechanically robust Ti–Ta scaffolds, underscoring their potential for advanced orthopedic applications.</div></div>","PeriodicalId":101164,"journal":{"name":"Smart Materials in Manufacturing","volume":"3 ","pages":"Article 100086"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143885999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Radiation and EMI shielding of 3D printed lightweight components for neuroimaging devices 用于神经成像设备的3D打印轻量级组件的辐射和EMI屏蔽

Smart Materials in Manufacturing Pub Date : 2025-01-01 DOI: 10.1016/j.smmf.2025.100085

Azadeh Mirabedini , Chris McCrowe , David Welch , Pradip Deb , Toh Yen Pang , Francesca Langenberg , Shieak Tzheng , Sergei Obruchkov , Stephen Davis , Geoffrey Donnan , Kate Fox

{"title":"Radiation and EMI shielding of 3D printed lightweight components for neuroimaging devices","authors":"Azadeh Mirabedini , Chris McCrowe , David Welch , Pradip Deb , Toh Yen Pang , Francesca Langenberg , Shieak Tzheng , Sergei Obruchkov , Stephen Davis , Geoffrey Donnan , Kate Fox","doi":"10.1016/j.smmf.2025.100085","DOIUrl":"10.1016/j.smmf.2025.100085","url":null,"abstract":"<div><div>The growing demand for miniaturized diagnostic neuroimaging devices, alongside the widespread use of electronics, presents an opportunity to develop lightweight, durable and non-toxic alternative shielding components. This study investigates lightweight shielding solutions for ultraportable neuroimaging toolkit devices for stroke detection, evaluating electromagnetic interference (EMI) and X-ray shielding properties of two commercially available conductive filaments: Koltron G1 and Fili Conductivo. The EMI shielding effectiveness (SE) of 3D-printed specimens with varying thicknesses was assessed across a broad frequency range from 10 MHz to 12 GHz, covering Ultra High Frequency (UHF), S-band, C-band, and X-band frequencies. Both materials demonstrated increased SE with thickness, with Koltron achieving a 102 % increase from 1 mm to 4 mm in the 10 MHz to 8.5 GHz range and up to ∼28.5 dB attenuation at lower frequencies. In the X-band, both performed similarly, averaging over 29 dB SE, with less variability in Koltron. X-ray shielding tests confirmed their effectiveness, with Koltron showing ∼65.5 % of lead's shielding performance when normalized for density. These results, combined with the lower weight and ease of processing of conductive thermoplastics compared to traditional metallic shielding materials, highlight their potential as flexible, lightweight, and non-toxic alternatives for enhancing the portability and efficiency of neuroimaging technologies, particularly in environments where conventional shielding methods are impractical, aiming to improve patient outcomes.</div></div>","PeriodicalId":101164,"journal":{"name":"Smart Materials in Manufacturing","volume":"3 ","pages":"Article 100085"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143868790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Self-lubrication and enhanced wear and corrosion resistance of calcium silicate hydrate nanostructures on Ti-based micro-arc oxidized coatings 水化硅酸钙纳米结构在ti基微弧氧化涂层上的自润滑和增强的耐磨损和耐腐蚀性能

Smart Materials in Manufacturing Pub Date : 2025-01-01 DOI: 10.1016/j.smmf.2025.100081

Xinjie Dai , Jingyi He , Yisong Chen , Ao Fu , Wei Zhang , Qianli Huang

{"title":"Self-lubrication and enhanced wear and corrosion resistance of calcium silicate hydrate nanostructures on Ti-based micro-arc oxidized coatings","authors":"Xinjie Dai , Jingyi He , Yisong Chen , Ao Fu , Wei Zhang , Qianli Huang","doi":"10.1016/j.smmf.2025.100081","DOIUrl":"10.1016/j.smmf.2025.100081","url":null,"abstract":"<div><div>Nanostructured coatings for titanium (Ti)-based implants are well-known for their biological properties; however, they are highly fragile in service. The debris generated by wear and coating destruction can lead to chronic inflammatory response, bone resorption, and, consequently, implant loosening. Therefore, the development of highly wear-resistant micro/nanostructured coatings is essential for the long-term service stability of Ti-based implants. In this study, calcium silicate hydrate nanostructures (CSHNs) were generated on micro-arc oxidation (MAO)-treated Ti surfaces via hydrothermal treatment (HT). Owing to the layered crystal feature of the CSHNs, as-prepared micro/nanostructured coatings exhibit typical self-lubricating performance under dry-sliding conditions, with their coefficients of friction measured to be ≤ 0.2. Meanwhile, the appropriate growth of CSHNs on MAO coatings is beneficial for reduced wear rate and enhanced corrosion resistance due to self-lubrication and increased coating crystallinity, respectively. However, in turn, the overgrowth of CSHNs with prolonged HT duration can compromise the wear and corrosion resistance owing to the potential risk of crack formation on MAO coatings. Overall, the results indicate that CSHNs are potential nanostructures for MAO coatings to achieve self-lubrication as well as enhanced wear and corrosion resistance.</div></div>","PeriodicalId":101164,"journal":{"name":"Smart Materials in Manufacturing","volume":"3 ","pages":"Article 100081"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development and evaluation of urea formaldehyde resin-modified poly(vinyl alcohol)-based biocomposites reinforced with Corchorus olitorius cellulose microfiber 松茸纤维素微纤维增强脲醛树脂改性聚乙烯醇基生物复合材料的研制与评价

Smart Materials in Manufacturing Pub Date : 2025-01-01 DOI: 10.1016/j.smmf.2025.100074

Shahin Sultana , Zahidul Islam , Md Khabir Uddin Sarker , Shamima Akther Eti , Swapan Kumer Ray , Mohammad Majedul Haque , Samia Tabassum

{"title":"Development and evaluation of urea formaldehyde resin-modified poly(vinyl alcohol)-based biocomposites reinforced with Corchorus olitorius cellulose microfiber","authors":"Shahin Sultana , Zahidul Islam , Md Khabir Uddin Sarker , Shamima Akther Eti , Swapan Kumer Ray , Mohammad Majedul Haque , Samia Tabassum","doi":"10.1016/j.smmf.2025.100074","DOIUrl":"10.1016/j.smmf.2025.100074","url":null,"abstract":"<div><div>This study aimed to investigate the effects of thermosetting urea formaldehyde (UF) resin on thermoplastic poly (vinyl alcohol) (PVA) biocomposites. Cellulose microfiber (CMF) was prepared from the extracted cellulose of jute fibers (<em>Corchorus olitorius)</em> using a mechanical ball milling technique, and the resulting material was used as a reinforcing ingredient to produce biocomposites. CMF was characterized by attenuated total reflection-Fourier transform infrared (ATR-FTIR), particle size measurement, and scanning electron microscopy (SEM). Biodegradable PVA-based sustainable green biocomposites were prepared with different CMF loadings (0%–10 % in weight) by the solution casting technique. UF resins with seven different wt% (ranging from 0.5 % to 10 %) were added to thermoplastic PVA to enhance the interpenetrating polymer networks (IPNs) of UF-PVA sheets via the casting technique. Furthermore, seven different wt% of CMF and UF (ranging from 0.5 % to 10 %) were mixed with PVA to produce CMF-UF-PVA biocomposites. Thermogravimetric analysis (TGA), SEM, ATR-FTIR, and tensile property investigations were conducted to characterize the products. The effectiveness of UF in the biocomposites was evaluated through the comparative characterization of neat PVA and UF-PVA, CMF-PVA, and CMF-UF-PVA biocomposites. The results indicate that the tensile strength of the biocomposites produced from 1 wt% UF, 1 wt% CMF, and 98 wt% PVA significantly improved by 118 % compared to the neat PVA matrix and all other biocomposites. Additionally, the biodegradability test results indicate that the CMF-UF-PVA biocomposite is more biodegradable than neat PVA. Therefore, compared to neat PVA, the CMF-UF-PVA biocomposite is more environmentally beneficial and sustainable.</div></div>","PeriodicalId":101164,"journal":{"name":"Smart Materials in Manufacturing","volume":"3 ","pages":"Article 100074"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stable waterborne epoxy resins: Impact of toughening agents on coating properties 稳定性水性环氧树脂：增韧剂对涂层性能的影响

Smart Materials in Manufacturing Pub Date : 2025-01-01 DOI: 10.1016/j.smmf.2025.100079

Yongshan Zhao , Hao Zhang , Xingzhu Zhu , Mengtong Wang , Duowei Shen , Changqing Fu , Jun Ma

{"title":"Stable waterborne epoxy resins: Impact of toughening agents on coating properties","authors":"Yongshan Zhao , Hao Zhang , Xingzhu Zhu , Mengtong Wang , Duowei Shen , Changqing Fu , Jun Ma","doi":"10.1016/j.smmf.2025.100079","DOIUrl":"10.1016/j.smmf.2025.100079","url":null,"abstract":"<div><div>Waterborne epoxy coatings are extensively utilized. However, traditional bisphenol A-based formulations are prone to chalking and cracking in low-temperature, high-humidity conditions, which undermines their protective qualities. To address the limitations, this study first synthesized a series of cyclic long-chain dicarboxylic acid compounds (CAs), which were used to replace bisphenol A (BPA), to develop two groups of waterborne epoxy resins. The CE waterborne epoxy resins (CEs) were prepared by completely replacing BPA with CAs in reactions with liquid epoxy resin. The CEB waterborne epoxy resins (CEBs) were synthesized through blending CA-4 with BPA at controlled ratios, followed by reaction with liquid epoxy resin. The research examined how the chain length in each CA influenced the properties of the resins, films and coatings. The findings revealed that all CAs effectively made the coatings ductile. Among the tested samples, the CE-4 film showed an elongation at break of 193 %, and its epoxy primer demonstrated excellent flexibility, passing a 1 mm cylindrical mandrel test without cracking. Furthermore, the epoxy varnishes formed transparent, continuous films at 5 °C. CA-4 significantly balanced the mechanical properties and durability of the CEB coatings, e.g. tensile strength 23.3 MPa and elongation at break 156 % for the CEB-80 film. At molar ratios of 2:3 and 3:2 of CA-4 to bisphenol A, the coatings not only showcased superior film-forming at 5 °C but also rivaled the salt spray resistance of commercial bisphenol A-based waterborne epoxy coatings.</div></div>","PeriodicalId":101164,"journal":{"name":"Smart Materials in Manufacturing","volume":"3 ","pages":"Article 100079"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143679049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fabrication and performance assessment of CoCrNi-based medium entropy alloy with silver-coated graphene 镀银石墨烯cocrni基中熵合金的制备及性能评价

Smart Materials in Manufacturing Pub Date : 2025-01-01 DOI: 10.1016/j.smmf.2025.100080

Qing Zhou , Yangyang Ma , Mingda Xie , Zhibin Ye , Zhichao Jiao , Ming Yang , Wenting Ye , Cunhong Yin , Haishan Teng , Xiaojiang Lu , Haifeng Wang

{"title":"Fabrication and performance assessment of CoCrNi-based medium entropy alloy with silver-coated graphene","authors":"Qing Zhou , Yangyang Ma , Mingda Xie , Zhibin Ye , Zhichao Jiao , Ming Yang , Wenting Ye , Cunhong Yin , Haishan Teng , Xiaojiang Lu , Haifeng Wang","doi":"10.1016/j.smmf.2025.100080","DOIUrl":"10.1016/j.smmf.2025.100080","url":null,"abstract":"<div><div>Graphene and its derivatives are widely used to improve the friction performance of metal composite materials. Unfortunately, challenges like uniform graphene dispersion and severe interfacial reactions hinder the development of graphene-reinforced medium entropy composite (MEC). In this work, silver-decorated reduced graphene oxide (rGO) as a reinforcement for CoCrNi MEA was prepared through a one-step chemical reduction method, achieving uniform graphene dispersion and alleviating the severe interfacial reaction. During spark plasma sintering (SPS), minimal graphene decomposition occurred, forming hard Cr<sub>23</sub>C<sub>6</sub> carbides. The friction testing showed that thermal and mechanical stresses facilitated the formation of a self-lubricating layer enriched with rGO and silver on the worn surface, leading to a synergistic effect among various solid lubricants and significantly improving the tribological performance. Under a load of 5 N, the average friction coefficient (COF) of the Ag@rGO/CoCrNi composite was 0.41, a 36.9 % reduction compared to the CoCrNi matrix, while the wear rate decreased by 6.5 %. At 15 N, the COF further reduced to 0.37, a 25.1 % decrease. Microscopic investigation elucidated sub-surface nano twins and FCC-HCP phase transition under high-stress conditions. This work provides a new strategy for graphene dispersion and an approach for fabricating high-performance metal-modified rGO/CoCrNi MECs.</div></div>","PeriodicalId":101164,"journal":{"name":"Smart Materials in Manufacturing","volume":"3 ","pages":"Article 100080"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rare earth orthoferrites (RFeO3, R= rare earth elements): A comprehensive review of structural, dielectric, and magnetic properties 稀土正铁氧体（RFeO3， R=稀土元素）：结构、介电和磁性能的综合综述

Smart Materials in Manufacturing Pub Date : 2025-01-01 DOI: 10.1016/j.smmf.2025.100082

Prafulla Kumar Pradhan , A.B. Panda , G.K. Mishra , N.K. Mohanty

{"title":"Rare earth orthoferrites (RFeO3, R= rare earth elements): A comprehensive review of structural, dielectric, and magnetic properties","authors":"Prafulla Kumar Pradhan , A.B. Panda , G.K. Mishra , N.K. Mohanty","doi":"10.1016/j.smmf.2025.100082","DOIUrl":"10.1016/j.smmf.2025.100082","url":null,"abstract":"<div><div>Rare earth-based orthoferrites perovskite oxides RFeO<sub>3</sub> (R = rare earth ions) have been studied by many researchers across the globe for their potential applications as smart devices due to their interesting properties. The understanding of the different properties of these kinds of materials requires a comprehensive analysis of their structural, dielectric, and magnetic attributes. This review summarizes the structural stability, dielectric, and magnetic properties of rare-earth-based orthoferrites perovskite oxides. It also provides basic knowledge for the synthesis and characterizations of rare-earth-based perovskite oxides by introducing fundamental knowledge to researchers. The study therefore, will help the readers to address the challenges like weak ferromagnetism, complex magnetic interactions, difficulties in precise material synthesis for growing high-quality single crystals, doping strategies for desired applications and temperature-dependent behaviours that limit their room-temperature applications. This tenability unlocks applications across diverse fields, including advanced data storage, sensitive gas sensors, efficient fuel cells, magnetically recoverable catalysts, and innovative magnetic devices, all vital for next-generation smart manufacturing technologies.</div></div>","PeriodicalId":101164,"journal":{"name":"Smart Materials in Manufacturing","volume":"3 ","pages":"Article 100082"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143791135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0