MatSciRN: Fabrication & Testing of Advanced Microcomposite Materials (Topic)最新文献

{"title":"Stable High-Entropy TiZrHfNbVCrMoMnFeCoNiAl Laves Phase","authors":"S. Uporov, R. Ryltsev, S. Estemirova, E. Sterkhov, N. Chtchelkatchev","doi":"10.2139/ssrn.3714489","DOIUrl":"https://doi.org/10.2139/ssrn.3714489","url":null,"abstract":"Abstract Recent researches in the field of high-entropy materials reveal an intriguing result: the multi-component systems combining the chemical elements with diverse valencies and radii can form single-phase solid solutions with the structure of intermetallic Laves phases. Here we report the fabrication of hexagonal Laves phase (C14, prototype MgZn 2 ) in duodenary TiZrHfNbVCrMoMnFeCoNiAl alloy. The phase is stable after the thermal treatment at 973 K for 50 h. To characterize the material, we examine its electrical conductivity and magnetic properties. The measurements reveal that the Laves phase is a Curie-Weiss paramagnet, which demonstrates metallic conduction and a pronounced Kondo-like anomaly at 80 K. Analysis of experimental data as well as ab initio calculations suggests that chemical complexity and compositional disorder cause strong s-d band scattering and thus the rather high density of d -states in the conduction band.","PeriodicalId":164752,"journal":{"name":"MatSciRN: Fabrication & Testing of Advanced Microcomposite Materials (Topic)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129998163","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}

{"title":"Elucidating the Effect of Gradient Structure on Strengthening Mechanisms and Fatigue Behavior of Pure Titanium","authors":"Xiao Li, Binhan Sun, B. Guan, Yun-Fei Jia, Congyang Gong, Xian‐Cheng Zhang, S. Tu","doi":"10.2139/ssrn.3688768","DOIUrl":"https://doi.org/10.2139/ssrn.3688768","url":null,"abstract":"Abstract Gradient nanostructured (GNS) layer was fabricated on the pure titanium using ultrasonic surface rolling process. With the coaction of deformation twinning, phase transformation, and dislocation slip, a spatial gradient of grain size distribution was formed. Nanocrystalline and amorphous phase exist simultaneously on the top surface. The effect of grain refinement, dislocation density, and deformation twinning on strength was analyzed quantitatively. Stress-controlled fatigue tests showed that enhanced fatigue strength was achieved on the GNS Ti due to the synergetic effect of microstructure and unique mechanical properties. The primary mechanism was fatigue-induced grain coarsening sustained the cumulative plastic strain during cyclic deformation and the GNS layer could change the crack initiation mode.","PeriodicalId":164752,"journal":{"name":"MatSciRN: Fabrication & Testing of Advanced Microcomposite Materials (Topic)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116809636","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}

{"title":"Fabrication of Three Bio-Adsorbents from Different Parts of Rape Straw","authors":"Juan Xie, Biao Liu, Hu Wanmg, Chenjie Wang, Lei Zhang, Penghui Bai, Dajun Wang, Yaozhuang Chen","doi":"10.1139/CJC-2021-0004","DOIUrl":"https://doi.org/10.1139/CJC-2021-0004","url":null,"abstract":"Three kinds of bio-adsorbents are fabricated from the different parts of rape straw, which are adsorbent core, adsorbent hull, and adsorbent stalk, respectively. As the adsorbates, kerosene, paraffin, rapeseed oil, and dibutyl phthalate are employed to evaluate the adsorption performance of the three kinds of bio-adsorbents. The results suggest that adsorbent core has much higher adsorption quantity to all the four adsorbates (27.37, 32.23, 33.37, and 39.28 g/g, respectively) than adsorbent hull (7.39, 8.37, 8.85, and 10.30 g/g) and adsorbent stalk (6.75, 7.25, 7.92, and 9.32 g/g). The adsorption mechanism of the three bio-adsorbents is investigated. The results illustrate that different bio-adsorbents own different micromorphologies. The special microchamber structure is found in the bio-adsorbent of the adsorbent core, which is seen as the main reason for its excellent adsorption performance. The adsorption volume of unit mass (Va) was proposed to evaluate the intrinsic adsorption properties of the bio-adsorbents. The recovery performance of the bio-adsorbents is investigated by using of two different treatment methods. The effect of treatment on recovery rate is discussed.","PeriodicalId":164752,"journal":{"name":"MatSciRN: Fabrication & Testing of Advanced Microcomposite Materials (Topic)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130162115","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}

{"title":"Dependence of Damage Evolution on Submicro-Micro Characteristics in Co/WC/Diamond Composites","authors":"Y. Schneider, U. Weber, R. Zielke, Ch. Xu, S. Schmauder, W. Tillmann","doi":"10.2139/ssrn.3632521","DOIUrl":"https://doi.org/10.2139/ssrn.3632521","url":null,"abstract":"Commercial Co/WC/diamond composites are hard metals and very useful as tool materials. This work studies their damage evolution in dependence of microstructural features. With 90vol.% Co, our material is also a kind of tool material, which is much less studied than the same type of composites with more than 50vol.% WC. The mean size ratio of diamond:WC particles is no less than 10:1. Another special characteristic is that the material behavior can be both ductile and quasi-brittle depending on the portion and local morphology of the diamond. Measurements are performed to achieve real microstructures, the local hardness, the local strain field, the local damage propagation, as well as the macro stress flow behavior. For the finite element (FE) simulations, different methods and techniques are applied. Both real and Poisson Voronoi microstructures are used in 2D and 3D, where residual stresses are taken into account before loading. For submicro-sized WC particles, which are too fine distributed to be meshed with an acceptable number of elements, their strengthening and size effect are taken into consideration through a homogenized matrix (Co-WC). FE results show that the WC phase has a higher mean stress value than the diamond phase, which is proved by the hardness test. The experimental and numerical results are compared on micro and macro scales. For the local strain distribution and the damage development, FE models well predict the reality, even in morphological details. An optimized microstructure should avoid diamond clusters and its local volume concentrations, which easily provoke fatal fracture.","PeriodicalId":164752,"journal":{"name":"MatSciRN: Fabrication & Testing of Advanced Microcomposite Materials (Topic)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125154469","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}

{"title":"Mechanical Characterisation of Epoxy Polymer Composite Reinforced with Ramie and Synthetic Fiber","authors":"L. M., J. Xavier, Kevin D Rodney, S. R., Sidharth J Prakash","doi":"10.2139/ssrn.3439194","DOIUrl":"https://doi.org/10.2139/ssrn.3439194","url":null,"abstract":"Composites materials are used in almost all features of the industrial and marketable fields in aircraft, ships, common vehicles, etc. The major attractive properties are the high strength-to­-weight ratio and high stiffness-to-weight ratio. Evolution of the Polymer Composites with synthetic fibre and natural fillers as a maintainable alternative for some engineering applications, predominantly in aerospace applications and automobile application.<br><br>An experimental study of mechanical characterization of Ramie fiber/glass fiber/Kevlar fiber Reinforced epoxy composite is our main objective of this research. The study included following tasks Fabrication of Ramie fiber/glass fiber/Kevlar fiber epoxy composite using hand lay-up technique, an Mechanical characterization such as tensile strength, flexural strength, impact strength and hardness no.","PeriodicalId":164752,"journal":{"name":"MatSciRN: Fabrication & Testing of Advanced Microcomposite Materials (Topic)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129856511","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}

{"title":"Low Temperature Joining and High Temperature Service of Segmented Half Heusler/Skutterudite Thermoelectric Joints","authors":"Weian Wang, M. Gu, Longhui Fang, Y. Bao, Jinhui Fan, Lidong Chen, Xiaoya Li","doi":"10.2139/ssrn.3389516","DOIUrl":"https://doi.org/10.2139/ssrn.3389516","url":null,"abstract":"A low temperature joining process has been developed to fabricate segmented half Heusler/skutterudite thermoelectric joints, and high temperature service behavior of the joints has been studied. The microstructure and electrical resistance cross the joint before and after aging were investigated. The joint is well bonded and no cracks appear at the interfaces of the joint before and after aging, which can attribute to the formation of high melting point intermetallic compounds. The electrical resistance crosses the bonding layer smoothly and the contact resistance is low. These results show the process is effective, and promising for preparation of segmented thermoelectric devices.","PeriodicalId":164752,"journal":{"name":"MatSciRN: Fabrication & Testing of Advanced Microcomposite Materials (Topic)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121647158","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}

{"title":"3D Bioprinted Endometrial Stem Cells on Melt Electrospun PCL Meshes for Pelvic Floor Application Promote Anti-Inflammatory Responses in Mice","authors":"K. Paul, S. Darzi, G. McPhee, M. D. Borgo, J. Werkmeister, C. Gargett, S. Mukherjee","doi":"10.2139/ssrn.3387674","DOIUrl":"https://doi.org/10.2139/ssrn.3387674","url":null,"abstract":"Endometrial mesenchymal stem/stromal cells (eMSCs) exhibit excellent regenerative capacity in the endometrial lining of the uterus following menstruation and high proliferative capacity in vitro. Bioprinting eMSCs onto a mesh could be a potential therapy for Pelvic Organ Prolapse (POP). This study reports a novel strategy targeting vaginal repair using bioprinting of eMSCs encapsulated in a hydrogel and3D melt electrospun mesh to generate a tissue engineering construct. Following a CAD, 3D printed poly e-caprolactone (PCL) meshes were fabricated using melt electrospinning (MES) at different temperatures using a GMP clinical grade GESIM Bioscaffolder. Electron and atomic force microscopies revealed that MES meshes fabricated at 100°C and with a speed 20 mm/sec had the largest open pore diameter (47.2 ± 11.4 μm) and the lowest strand thickness (121.4 ± 46 μm) that promoted optimal eMSC attachment. An Aloe Vera-Sodium Alginate (AV-ALG) composite based hydrogel was optimised to a 1:1 mixture (1%AV-1%ALG) and eMSCs, purified from human endometrial biopsies, were then bioprinted in this hydrogel onto the MES printed meshes. Acute in vivo foreign body response assessment in NSG mice revealed that eMSC printed on MES constructs promoted tissue integration, eMSC retention and an anti-inflammatory M2 macrophage phenotype characterised by F4/80+CD206+ colocalization. Our results address an unmet medical need highlighting the potential of alternative 3D bioprinted eMSC-MES meshes as a novel approach to overcome the current challenges with non-degradable knitted meshes in POP treatment.","PeriodicalId":164752,"journal":{"name":"MatSciRN: Fabrication & Testing of Advanced Microcomposite Materials (Topic)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122428036","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}

{"title":"Enhanced Work-Hardening and Toughening Via Contiguous Stress-Induced Martensitic Transformation and Mechanical Twinning in Ti-Zr-Hf-Nb-Al High Entropy Alloys","authors":"Lu-Ning Wang, Chao Fu, Yidong Wu, Runguang Li, Yandong Wang, X. Hui","doi":"10.2139/ssrn.3310266","DOIUrl":"https://doi.org/10.2139/ssrn.3310266","url":null,"abstract":"Refractory high entropy alloys (HEAs) have been considered as candidate alloys for next-generation high-temperature applications, but encounter the strength-ductility trade-off dilemma. In this article, we proposed a strategy of strengthening and toughening for Ti-rich refractory HEAs by the initiation of martensitic transformation and mechanical twinning successively. Three Ti-Zr-Hf-Al-Nb HEAs with the tensile strength and elongation up to 1167 MPa and 34%, respectively, which are superb among most of the reported BCC HEAs, have been successfully prepared. By using the SEM, TEM, HE-XRD and EBSD setups, the as-cast and fully recrystallized microstructures for these HEAs were characterized. And the mechanisms for the martensitic transformation and mechanical twinning in these HEAs are deeply explored. It has been clarified that under the as-cast and fully recrystallized state, these HEAs are mainly composed of β phase and a little of α′′ martensite phase. Stress-induced martensitic transformation took place in favor of special variants with the [110]β//LD, which has the maximum transformation strain of 7.8%. At the later stage, mechanical twinning α′′ phase have formed between the α′′ laths and the β matrix with the preferential orientation relationship of [111]β//[101]α′′M//[-10-1]α′′T.","PeriodicalId":164752,"journal":{"name":"MatSciRN: Fabrication & Testing of Advanced Microcomposite Materials (Topic)","volume":"59 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114015843","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}

{"title":"Testing and Modeling of Creep Behavior of Different Fiber Content and Type Single-Tow CVI-SiC f/SiC Minicomposites","authors":"A. Almansour, G. Morscher","doi":"10.2139/ssrn.3310269","DOIUrl":"https://doi.org/10.2139/ssrn.3310269","url":null,"abstract":"The understanding of creep deformation in high-temperature SiC_f /SiC composites is essential in order to better predict stress-redistribution and life-limiting scenarios under high temperature and stress conditions. One area that warrants further investigation is the effect of constituent content and type on creep behavior. Therefore, this study evaluated the tensile creep behavior of different fiber volume fraction pristine and precracked Hi-Nicalon, Hi-Nicalon Type S, and Tyranno ZMI SiC fiber reinforced minicomposites with boron nitride (BN) interphase and chemical vapor infiltrated silicon carbide (CVI-SiC) matrix. Creep tests were performed in air at 1200°C for pristine minicomposites and some minicomposites that were pre-cracked. Precracking stresses were determined from room temperature monotonic tensile tests with acoustic emission monitoring. A single fiber tow minicomposite can be considered the basic architectural feature of woven and laminate ceramic matrix composites (CMCs). The minicomposite creep damage behavior represents the creep behavior of 0° fiber tows in the axial loading direction of a macrocomposite or component. A bottom-up creep damage characterization and modeling approach was applied where creep parameters of the different minicomposite constituents were obtained separately at 1200° C. Next, a theoretical model based on the rule of mixtures was derived to model the fibers and matrix creep-time-dependent stress redistribution and fiber volume fraction effect on load transfer. Fiber and matrix creep parameters, load transfer model results, and developed numerical model methodology were used to construct a creep strain model to predict creep damage evolution of the different fiber type and content minicomposites, which was used to model the creep behavior of Hi-Nicalon and Hi-Nicalon Type S SiC fiber-reinforced minicomposites. This study demonstrates a testing methodology and modeling approaches for use in screening, developing, and improving new generation ceramic matrix composites.","PeriodicalId":164752,"journal":{"name":"MatSciRN: Fabrication & Testing of Advanced Microcomposite Materials (Topic)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129071213","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}

{"title":"Stacked Conical-Cylindrical Hybrid Dielectric Resonator Antenna for Improved Ultrawide Bandwidth","authors":"A. Al-Azza, Nuhad A. Malalla, F. Harackiewicz, K. Han","doi":"10.2528/pierl18081008","DOIUrl":"https://doi.org/10.2528/pierl18081008","url":null,"abstract":"Conical and cylindrical dielectric resonator elements are vertically stacked and excited by a simple coaxial monopole. Compared to all earlier configurations, the proposed geometry significantly improves the impedance bandwidth. The ultrawideband response is enhanced due to the multiple resonances occurring by the suggested hybrid antenna. The footprint area of the antenna is only 63.6 mm2 or 25.44 x10-3λo 2 at the lowest operating frequency. The performance of the antenna is verified experimentally and numerically. Presented results show that the proposed hybrid monopole-DRA has a measured impedance bandwidth up to 148.6% (S11 < -10 dB) along with consistent monopole-like radiation patterns and peak gain of 7.14 dBi. With such properties, the proposed hybrid monopole-DRA can be used in different ultra-wideband wireless applications and as wideband electromagnetic interference (EMI) sensors.","PeriodicalId":164752,"journal":{"name":"MatSciRN: Fabrication & Testing of Advanced Microcomposite Materials (Topic)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115273025","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}