Materials最新文献_第3页

Phase-Field Damage Modeling of Electromechanical Fracture in MEMS Piezoelectric Films. MEMS压电薄膜机电断裂的相场损伤建模。

IF 3.2 3区材料科学

Materials Pub Date : 2026-04-21 DOI: 10.3390/ma19081662

Xuanyi Chen, Yuhan Zhang, Yu Xue, Yangjie Shi, Jiaxing Cheng

{"title":"Phase-Field Damage Modeling of Electromechanical Fracture in MEMS Piezoelectric Films.","authors":"Xuanyi Chen, Yuhan Zhang, Yu Xue, Yangjie Shi, Jiaxing Cheng","doi":"10.3390/ma19081662","DOIUrl":"10.3390/ma19081662","url":null,"abstract":"Piezoelectric thin films have been widely used in micro-electromechanical systems (MEMSs), such as sensors, actuators, and resonant devices. Electromechanically driven fractures can severely degrade device performance and reliability. In this work, a phase-field damage model is developed for MEMS piezoelectric thin films under coupled electromechanical loading, incorporating pre-existing defects via an equivalent local fracture toughness. Microcracks and micro-voids arising from manufacturing defects are integrated into the model through an effective local fracture toughness, enabling a unified description of their roles in crack initiation and propagation. The proposed model is implemented in ABAQUS by means of a user-defined element (UEL) subroutine and solved using a staggered scheme. Numerical results show that the level of pre-existing defects, the applied electric potential, and the polarization direction all exert significant effects on fracture behavior. As the defect parameter Dc increases from 0 to 0.10, the reaction force decreases from 87.8 N to 86.3 N, indicating reduced fracture resistance due to manufacturing-induced defects. In addition, the reaction force changes from 90.3 N at -500 V to 86.3 N at +500 V, while it decreases from 102.9 N to 87.1 N as the polarization angle β increases from 0° to 90°. These results demonstrate that pre-existing defects and electromechanical loading jointly govern crack evolution in MEMS piezoelectric thin films. The present study provides a useful numerical tool for fracture analysis, reliability assessment, and structural design of MEMS piezoelectric devices containing manufacturing defects.","PeriodicalId":18281,"journal":{"name":"Materials","volume":"19 8","pages":""},"PeriodicalIF":3.2,"publicationDate":"2026-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13118041/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147816852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental Determination of Isothermal Sections in the Ni-Al-Cr-Ru Quaternary System: Implications for Ni-Based Superalloys and High-Entropy Alloys. Ni-Al-Cr-Ru四元体系等温截面的实验测定：对ni基高温合金和高熵合金的启示。

IF 3.2 3区材料科学

Materials Pub Date : 2026-04-21 DOI: 10.3390/ma19081669

Jianping Huang, Dupei Ma, Zhi Li, Yan Liu, Ruihua Wang, Huayu Xiao, Qiang Zhang

{"title":"Experimental Determination of Isothermal Sections in the Ni-Al-Cr-Ru Quaternary System: Implications for Ni-Based Superalloys and High-Entropy Alloys.","authors":"Jianping Huang, Dupei Ma, Zhi Li, Yan Liu, Ruihua Wang, Huayu Xiao, Qiang Zhang","doi":"10.3390/ma19081669","DOIUrl":"10.3390/ma19081669","url":null,"abstract":"The phase equilibria of the Ni-Al-Cr-Ru quaternary system were systematically investigated using the equilibrated alloy method combined with scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and X-ray diffraction (XRD). This study focuses on three key isothermal sections within the system: 55 at.% Al at 1423 K, 55 at.% Ni at 1173 K, and 60 at.% Ni at 1423 K. In the 55 at.% Al section at 1423 K, a four-phase equilibrium region comprising Bcc(Cr), β-(Ni,Ru)Al, Al8Cr5, and Al2Ru, along with three three-phase regions, was identified. Complete mutual solubility between the NiAl and AlRu phases was achieved with approximately 10 at.% Cr. In the 55 at.% Ni section at 1173 K, two four-phase and seven three-phase equilibrium regions were observed. The addition of Cr was found to promote the emergence of the Fcc(Ni) + β-(Ni,Ru)Al + Ni3Al three-phase region and the Fcc(Ni) + β-(Ni,Ru)Al two-phase region. Critically, Cr addition enabled complete solubility between the β1 (NiAl) and β2 (AlRu) phases even at 1173 K. For the 60 at.% Ni section at 1423 K, while no four-phase equilibrium was found, two three-phase regions-(Ni,Ru)Al + Hcp(Ru) + Fcc(Ni) and (Ni,Ru)Al + Ni3Al + Fcc(Ni)-were confirmed. Notably, the (Ni,Ru)Al + Fcc(Ni) two-phase region exhibited a wide compositional range. This work provides essential experimental phase diagram data and insights for the design of Ni-Al-Cr-Ru-X high-entropy alloys and next-generation Ni-based superalloys.","PeriodicalId":18281,"journal":{"name":"Materials","volume":"19 8","pages":""},"PeriodicalIF":3.2,"publicationDate":"2026-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13118003/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147816960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Processing of High-Quality WC-Inconel 625 Coating via DED. 高质量WC-Inconel 625涂层的DED加工。

IF 3.2 3区材料科学

Materials Pub Date : 2026-04-21 DOI: 10.3390/ma19081666

Jingjing Wang, Nellian Alagu Subramaniam, Eddie Zhi En Tan, John Hock Lye Pang

{"title":"Processing of High-Quality WC-Inconel 625 Coating via DED.","authors":"Jingjing Wang, Nellian Alagu Subramaniam, Eddie Zhi En Tan, John Hock Lye Pang","doi":"10.3390/ma19081666","DOIUrl":"10.3390/ma19081666","url":null,"abstract":"This study examines the effects of laser power (P), scanning speed (SS), and energy density (ED) on the microstructure and hardness of WC-reinforced Inconel 625 metallic matrix composite (MMC) coatings fabricated via a powder-based directed energy deposition (DED) process developed by Makino Asia Pte Ltd. Coating layers were evaluated for surface roughness (Sa), layer height (LH), porosity (Pr), dilution height (DH), dilution ratio (DR), and WC retention (WC%). Trends in the data reveal how process parameters influence deposition quality and microstructural evolution: higher P or lower SS increased melt pool depth, promoted WC dissolution, and coarsened microstructure, whereas lower P or higher SS preserved WC particles and minimized substrate dilution. Hardness variations in the Inconel 625 matrix were associated with dendrite size, solid-solution strengthening, dislocation density, and secondary carbide formation. These findings provide quantitative guidance for selecting DED parameters to produce crack-free WC-Inconel 625 MMC coatings with controlled microstructure and tailored mechanical properties.","PeriodicalId":18281,"journal":{"name":"Materials","volume":"19 8","pages":""},"PeriodicalIF":3.2,"publicationDate":"2026-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13117566/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147816991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","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 Effect of Microstructural Evolution on Mechanical Behavior of Carbon/Carbon Composites After Heat Treatment. 热处理后微观组织演变对碳/碳复合材料力学行为的影响。

IF 3.2 3区材料科学

Materials Pub Date : 2026-04-20 DOI: 10.3390/ma19081640

Zhenyu Yuan, Xiao Liu, Yu Yang

引用次数: 0

Enhanced Thermoelectric Properties of Oxyselenide Bi₂O₂Se via Cl Doping and Microstructure Modulation. 通过Cl掺杂和微观结构调制增强氧化硒化Bi2O2Se的热电性能。

IF 3.2 3区材料科学

Materials Pub Date : 2026-04-20 DOI: 10.3390/ma19081641

Lele Chen, Ruqing Chen, Yule Huang, Meiqing Liang, Yang Zhou, Danning Ma, Kai Guo

{"title":"Enhanced Thermoelectric Properties of Oxyselenide Bi2O2Se via Cl Doping and Microstructure Modulation.","authors":"Lele Chen, Ruqing Chen, Yule Huang, Meiqing Liang, Yang Zhou, Danning Ma, Kai Guo","doi":"10.3390/ma19081641","DOIUrl":"10.3390/ma19081641","url":null,"abstract":"Bi2O2Se is an emerging oxyselenide semiconductor, noted for its promising thermoelectric properties and excellent chemical stability, and it is often regarded as an n-type counterpart to p-type BiCuSeO. However, its intrinsic thermoelectric figure of merit (zT) is severely limited by low electron concentration and high thermal conductivity. In this work, we employed Cl element as donator dopant to substantially enhance the carrier concentration. The room-temperature carrier concentration of Bi2O2Se0.98Cl0.02 thereby reached 2.70 × 1020 cm-3, representing an improvement of two orders of magnitude compared to that of pristine Bi2O2Se. Subsequently, multiple hot-pressing cycles were applied to the optimized composition Bi2O2Se0.98Cl0.02. The process induced significant grain refinement, and the resulting high density of grain boundaries effectively suppressed the lattice thermal conductivity, reducing it to 0.95 W·m-1·K-1 at 823 K. Eventually, a maximum zT of 0.24 was achieved at 823 K for the three-time hot-pressed Bi2O2Se0.98Cl0.02 sample, representing a 71% improvement compared with the pristine Bi2O2Se sample prepared by single hot-pressing (zT = 0.14 at 823 K). This work provides a new strategy for enhancing the thermoelectric performance of oxyselenide through the synergistic regulation of doping and microstructure.","PeriodicalId":18281,"journal":{"name":"Materials","volume":"19 8","pages":""},"PeriodicalIF":3.2,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13118045/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147816957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Relationship Between Xonotlite Crystallite Size and Strength Degradation of Silica-Enriched Oil Well Cement Under 240 °C Curing Conditions. 240℃养护条件下富硅油井水泥硅钙石晶粒尺寸与强度退化的关系

IF 3.2 3区材料科学

Materials Pub Date : 2026-04-20 DOI: 10.3390/ma19081651

Guodong Cheng, Lei Chen, Qian Tao, Haoguang Wei, Fuzhu Xie, Jixiang Wang, Jun Lu

引用次数: 0

Preparation of γ-TiAl Alloys via Self-Propagating Aluminothermic Reduction-Slag Washing Refining Coupled with Vacuum Arc Remelting. 自扩散铝热还原-洗渣精炼-真空电弧重熔法制备γ-TiAl合金。

IF 3.2 3区材料科学

Materials Pub Date : 2026-04-20 DOI: 10.3390/ma19081650

Han Jiang, Ting-An Zhang, Zhi-He Dou

引用次数: 0

Interfacial Friction-Controlled Fiber Failure Modes for Toughness Enhancement of Engineered Cementitious Composites. 增强工程胶凝复合材料韧性的界面摩擦控制纤维破坏模式。

IF 3.2 3区材料科学

Materials Pub Date : 2026-04-20 DOI: 10.3390/ma19081643

Dachuan Zhang, Yingzi Yang, Zhendi Wang, Ling Wang

{"title":"Interfacial Friction-Controlled Fiber Failure Modes for Toughness Enhancement of Engineered Cementitious Composites.","authors":"Dachuan Zhang, Yingzi Yang, Zhendi Wang, Ling Wang","doi":"10.3390/ma19081643","DOIUrl":"10.3390/ma19081643","url":null,"abstract":"Despite extensive advancements in Engineered Cementitious Composites (ECCs), mixture design remains predominantly empirical, due to the absence of a quantitative parameter directly linking fiber-matrix interfacial mechanics to strain-hardening performance. This study identifies fiber-matrix interfacial friction as a quantifiable parameter and establishes a micromechanics-guided interfacial regulation framework to enhance the toughness of ECC by regulating fiber failure modes. First, a critical fiber-matrix interfacial frictional stress, (τ0)crit, corresponding to the transition between fiber pull-out and fracture, was theoretically derived based on energy dissipation maximization during crack propagation. A back-calculation approach was further developed to determine interfacial frictional stress (τ0) directly from tensile stress-crack opening responses under single-crack tension, eliminating reliance on single-fiber pull-out testing. Then, τ0 was tuned toward (τ0)crit through interfacial regulation using fly ash. Experimental results demonstrate that the toughness of ECC is maximized when τ0 approaches (τ0)crit, confirming the validity of the proposed toughness enhancement mechanism. The study establishes an explicit mechanistic linkage between interfacial micromechanics and macroscopic strain-hardening performance, providing a predictive and quantitative design pathway that transcends empirical mixture adjustment.","PeriodicalId":18281,"journal":{"name":"Materials","volume":"19 8","pages":""},"PeriodicalIF":3.2,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13117404/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147816958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Parametric Study on Scarf Patch Repairs for Shipboard Composite Structures. 舰船复合材料结构围巾修补的参数化研究。

IF 3.2 3区材料科学

Materials Pub Date : 2026-04-20 DOI: 10.3390/ma19081644

Panpan Liang, Guanbo Wang, Qingchang Guo, Maojun Li, Pan Gong

{"title":"Parametric Study on Scarf Patch Repairs for Shipboard Composite Structures.","authors":"Panpan Liang, Guanbo Wang, Qingchang Guo, Maojun Li, Pan Gong","doi":"10.3390/ma19081644","DOIUrl":"10.3390/ma19081644","url":null,"abstract":"This study focuses on the of key engineering parameters for the repair of shipboard carbon fiber reinforced polymer composite structures using a scarf patch repair configuration. A three-dimensional finite element model was developed to systematically analyze the effects of repair location (center-symmetric, diagonal-asymmetric, and edge-unidirectional) and cut-out depth (2.0 mm, 3.0 mm, and 4.0 mm) on the mechanical response of the repair structure. The results indicate that although the local stress level of the center-symmetric repair is slightly higher, it provides a continuous load transfer path with more balanced stress distribution, demonstrating the best overall mechanical performance. When the cut-out depth is 3.0 mm, the repair structure achieves an optimal balance between stress uniformity and displacement coordination, effectively reducing the risk of early adhesive layer failure and local buckling. This study identifies the optimal parameter combination for scarf patch repairs, providing important theoretical foundations and references for the design of repair processes and the standardization of engineering practices in shipboard composite structures.","PeriodicalId":18281,"journal":{"name":"Materials","volume":"19 8","pages":""},"PeriodicalIF":3.2,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13117075/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147816911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recent Advances in Triboelectric Nanogenerators for Biomedical and Cardiovascular Monitoring. 用于生物医学和心血管监测的摩擦电纳米发电机的最新进展。

IF 3.2 3区材料科学

Materials Pub Date : 2026-04-20 DOI: 10.3390/ma19081647

Amit Sarode, Jegan Rajendran, Gymama Slaughter

{"title":"Recent Advances in Triboelectric Nanogenerators for Biomedical and Cardiovascular Monitoring.","authors":"Amit Sarode, Jegan Rajendran, Gymama Slaughter","doi":"10.3390/ma19081647","DOIUrl":"10.3390/ma19081647","url":null,"abstract":"Triboelectric nanogenerators (TENGs) have emerged as versatile self-powered platforms for wearable and implantable biomedical sensing, offering an alternative to battery-dependent electronic devices. By converting biomechanical energy from physiological motion into electrical signals, TENGs enable simultaneous energy harvesting and active sensing within flexible, lightweight, and biocompatible architectures. This review summarizes recent advances from 2020 to 2025 in triboelectric nanogenerator (TENG)-based cardiovascular monitoring. The discussion focuses on material systems, device configurations, sensing mechanisms, and applications including pulse detection and cuffless blood pressure estimation. Representative studies are compared to highlight emerging trends in wearable and self-powered sensing technologies. However, differences in experimental conditions, anatomical sites, calibration methods, and signal-processing approaches limit direct comparison of reported performance. In addition, challenges such as subject-specific calibration, motion artifacts, and limited clinical validation remain. Overall, this review highlights current progress and outlines key challenges for future development and translation of TENG-based cardiovascular monitoring systems.","PeriodicalId":18281,"journal":{"name":"Materials","volume":"19 8","pages":""},"PeriodicalIF":3.2,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13117456/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147817082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0