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Different Methods for Calculation of Activation Energies During Non-Isothermal Annealing of Mg72Zn27Pt1 and Mg72Zn27Cu1 Metallic Glasses.
IF 3.1 3区 材料科学
Materials Pub Date : 2025-02-05 DOI: 10.3390/ma18030694
Aleksandra Pierwoła, Janusz Lelito, Michał Szucki, Halina Krawiec
{"title":"Different Methods for Calculation of Activation Energies During Non-Isothermal Annealing of Mg<sub>72</sub>Zn<sub>27</sub>Pt<sub>1</sub> and Mg<sub>72</sub>Zn<sub>27</sub>Cu<sub>1</sub> Metallic Glasses.","authors":"Aleksandra Pierwoła, Janusz Lelito, Michał Szucki, Halina Krawiec","doi":"10.3390/ma18030694","DOIUrl":"10.3390/ma18030694","url":null,"abstract":"<p><p>Mg<sub>72</sub>Zn<sub>27</sub>Pt<sub>1</sub> and Mg<sub>72</sub>Zn<sub>27</sub>Cu<sub>1</sub> metallic glasses were produced using a melt-spinner. Their crystallization kinetics were investigated during annealing with five heating rates using DSC. Amorphous Mg<sub>72</sub>Zn<sub>27</sub>Pt<sub>1</sub> crystallized in the form of one and Mg<sub>72</sub>Zn<sub>27</sub>Cu<sub>1</sub> crystallized in the form of two exothermic crystallization peaks. It was noticed that the glass transition, the onset crystallization and the crystallization peak temperatures were strongly heating-rate-dependent. The addition of Pt and Cu increased the stability compared to that of binary Mg-Zn glass, and especially so with Pt, due to its higher melting point and different atom size to those of Mg and Zn. The activation energies were calculated using six model-free methods: the Kissinger, Ozawa-Flynn-Wall, Boswell, Tang, Augis-Bennett and Gao-Wang methods. The Augis-Bennett and Gao-Wang methods allow for the calculation of only the activation energy at the crystallization peak but they are the only ones that consider Tx or dx/dT. For Mg<sub>72</sub>Zn<sub>27</sub>Pt<sub>1</sub>, the calculated values fluctuate in the ranges 114.60-117.99 kJ/mol, 102.46-105.98 kJ/mol and 71.16-98.62 kJ/mol for Eg, Ex and Ep, respectively, whereas, for Mg<sub>72</sub>Zn<sub>27</sub>Cu<sub>1</sub>, the calculated values are in the ranges of 98.51-101.77 kJ/mol, 95.15-98.51 kJ/mol and 55.15-93.34 kJ/mol for Eg, Ex and Ep, respectively. Both alloys are meta-stable in the amorphous state and crystallization occurs spontaneously. The Kissinger, Ozawa-Flynn-Wall, Tang and Boswell methods give similar values for the activation energy. The Gao-Wang method significantly underestimates values compared to other methods. The Augis-Bennett method shows much lower values for the local activation energy. Considering the ease of their formulas, best convergence and widespread use in the literature, the Kissinger and Ozawa-Flynn-Wall methods will work very well for any comparison.</p>","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11821047/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143407727","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
Design and Heat Transfer Analysis of Graphene-Based Electric Heating Solid Wood Composite Energy Storage Flooring.
IF 3.1 3区 材料科学
Materials Pub Date : 2025-02-05 DOI: 10.3390/ma18030698
Bo Guan, Wen Qu, Xinchi Tian, Zihao Zhang, Guoyu Sun, Siman Zhou, Xiaoyu Feng, Chengwen Sun, Chunmei Yang
{"title":"Design and Heat Transfer Analysis of Graphene-Based Electric Heating Solid Wood Composite Energy Storage Flooring.","authors":"Bo Guan, Wen Qu, Xinchi Tian, Zihao Zhang, Guoyu Sun, Siman Zhou, Xiaoyu Feng, Chengwen Sun, Chunmei Yang","doi":"10.3390/ma18030698","DOIUrl":"10.3390/ma18030698","url":null,"abstract":"<p><p>Due to severe global energy issues and the widespread demand for high-quality winter heating, this study designed a new type of graphene-based electrically heated solid wood composite floor. This flooring maintains the convenience of a traditional floor installation while providing users with a more comfortable living experience. Additionally, the low-temperature heating and temperature regulation system further reduces energy consumption, offering a new perspective for green home living. This paper introduces the overall structure and temperature control system of the graphene-heated solid wood composite flooring. Based on the above reasons, the working mechanism and heat transfer process of the graphene-heated flooring were analyzed, and a mathematical model was established. Furthermore, simulations of flooring with different thicknesses were conducted to determine temperature rise curves and corresponding times. Finally, a comparative experimental verification was conducted on the thermodynamic performance of the solid wood composite graphene flooring. The results showed that in the case of a floor with an 18 mm thickness, the time for the surface layer of the floor to reach 22 °C is 27 min; the time to reach 26 °C is 56 min; and that the time to reach 28 °C is 109 min. The time required to return to 22 °C after the power has been switched off is 25 min. The results also showed that one hour after the power was turned off, the surface temperature of the floor was still above 20 °C. The study shows that the graphene-heated flooring can be used to achieve high-quality heating.</p>","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11820558/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408812","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
Molecular Dynamics Investigation of the Diffusion Mechanisms and Thermodynamic Behaviors in Warm Mix Recycled Asphalt Binders with and Without Rejuvenators.
IF 3.1 3区 材料科学
Materials Pub Date : 2025-02-05 DOI: 10.3390/ma18030703
Qisheng Hu, Derun Zhang, Peixin Xu
{"title":"Molecular Dynamics Investigation of the Diffusion Mechanisms and Thermodynamic Behaviors in Warm Mix Recycled Asphalt Binders with and Without Rejuvenators.","authors":"Qisheng Hu, Derun Zhang, Peixin Xu","doi":"10.3390/ma18030703","DOIUrl":"10.3390/ma18030703","url":null,"abstract":"<p><p>In recent years, the employment of rejuvenators and warm mix asphalt (WMA) additives for reclaimed asphalt pavement (RAP) has been recognized as a popular approach to increase the recycling rate of waste materials and promote the sustainable development of pavement engineering. However, the composition of warm mix recycled asphalt binder is complicated, and the microstructural changes brought about by the rejuvenators and WMA additives are critical in determining its macroscopic mechanical properties. This research focuses on the atomic modeling of the rejuvenators and WMA additives diffusion behavior of the warm mix recycled asphalt binder. The objective is to reveal the thermodynamic performance and diffusion mechanism of the WMA binder under the dual presence of rejuvenators and WMA additives. Three types of mutual diffusion systems (Aged and oil + virgin + wax, Aged + virgin + wax, and Aged and oil + virgin) were established, respectively, for a comparative investigation of the glass transition temperature, viscosity, thermodynamics, free volume, and diffusion behavior. The results indicate a 44.27% and 31.33% decrease in the glass transition temperature and apparent viscosity, respectively, after the incorporation of 5% oil rejuvenators in the Aged + virgin + wax asphalt binder, demonstrating the improved cracking resistance and construction workability. The presence of the RAP binder and organic WMA additives raised the cohesion of the asphalt binder and decreased self-healing ability and free volume, and these detrimental influences can be offset by the introduction of rejuvenators. The combined use of rejuvenators and organic WMA additives remarkably enhanced the de-agglomeration to asphaltenes, stimulated the activity of aged RAP macromolecular components, and ultimately improved the blending efficiency of virgin binders with the overall structure of RAP binders.</p>","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11820756/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143407728","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
Static and Fatigue Properties of Rhenium-Alloyed Inconel 718 Produced by Powder Bed Fusion Additive Manufacturing.
IF 3.1 3区 材料科学
Materials Pub Date : 2025-02-05 DOI: 10.3390/ma18030692
Mariusz Frankiewicz, Michał Karoluk, Robert Dziedzic, Konrad Gruber, Wojciech Stopyra
{"title":"Static and Fatigue Properties of Rhenium-Alloyed Inconel 718 Produced by Powder Bed Fusion Additive Manufacturing.","authors":"Mariusz Frankiewicz, Michał Karoluk, Robert Dziedzic, Konrad Gruber, Wojciech Stopyra","doi":"10.3390/ma18030692","DOIUrl":"10.3390/ma18030692","url":null,"abstract":"<p><p>Inconel 718 (In718) is the most widely used nickel-based alloy in additive manufacturing due to its favorable processability. However, In718's high-temperature performance is not suited for the most demanding applications in the aerospace industry. Therefore, in this study, Inconel 718 powder was coated with 3% wt. rhenium (In718-Re) using AM's in situ alloying capabilities to improve high-temperature properties. The proposed alloy's mechanical performance was evaluated, focusing on the effects of post-process heat treatment and hot isostatic pressing following the laser-based powder bed fusion of metals (PBF-LB/M) processing. Static tensile tests conducted at room temperature and elevated temperatures (650 °C and 760 °C) demonstrated that the alloy has comparable strength to pure In718 according to ASTM F3055-14a-an ultimate tensile strength of 1247 MPa, yield strength of 909 MPa, and almost 2× higher elongation of 23.8%. Fatigue tests at room temperature indicated a fatigue limit below 400 MPa for 10<sup>7</sup> cycles. Fractographic analysis revealed that fatigue performance was primarily impacted by a lack of fusion defects inherent to the PBF-LB/M process, highlighting the need for optimized powder preparation and processing parameters to minimize defect formation. While rhenium addition shows limited benefits in Inconel 718, this study underscores the potential of in situ alloying through powder surface modification as a flexible method for incorporating high-melting-point elements into nickel-based alloys for tailored alloy design in additive manufacturing.</p>","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11820652/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143409040","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
Photographic Analysis of a Low-Current, Vacuum Electric Arc Using an Ultrafast Camera.
IF 3.1 3区 材料科学
Materials Pub Date : 2025-02-05 DOI: 10.3390/ma18030693
Michał Lech, Paweł Węgierek
{"title":"Photographic Analysis of a Low-Current, Vacuum Electric Arc Using an Ultrafast Camera.","authors":"Michał Lech, Paweł Węgierek","doi":"10.3390/ma18030693","DOIUrl":"10.3390/ma18030693","url":null,"abstract":"<p><p>The main component of vacuum interrupters responsible for ensuring the correct flow of current is the contact system. In a vacuum environment, due to the higher values of the mean free path of electrons and particles in the contact gap, the material and condition of the contacts exert the greatest influence on the development of the arc discharge. To accurately analyze the phenomenon of discharge development in vacuum insulating systems, the authors conducted a time-lapse photographic analysis of a vacuum electric arc. For this purpose, they used a test setup comprising a discharge chamber, a vacuum pump set, a power and load assembly, an ultra-high-speed camera, and an oscilloscope with dedicated probes. The measurement process involved connecting the system, determining the power supply, load, and measurement parameters and subsequently performing contact opening operations while simultaneously recording the process using the oscilloscope and ultra-high-speed camera. An analysis of a low-current vacuum arc in a residual helium gas environment, with a pressure of <i>p</i> = 1.00 × 10<sup>1</sup> Pa was carried out. Different phases of vacuum arc burning between electrodes in the discharge chamber were identified. In the stable phase, the arc voltage remained constant, while in the unstable phase, the arc voltage increased. The results of the time-lapse analysis were compared with the characteristics recorded by the oscilloscope, revealing a correlation between the increase in vacuum arc voltage and the intensity of flashes in the interelectrode space. The movement of microparticles ejected from the surface of the contacts-either reflecting or adhering to one of the electrodes-was observed. This analysis provides a deeper understanding of the processes involved in discharge formation and development under reduced pressure conditions. Understanding these mechanisms can support the design of vacuum interrupters, particularly in the selection of suitable contact materials and shapes.</p>","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11819706/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408920","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
Influence of Interface Mixed Layer on Non-Collinear Exchange Coupling in V-Fe Multilayers.
IF 3.1 3区 材料科学
Materials Pub Date : 2025-02-05 DOI: 10.3390/ma18030697
Agnieszka Ranecka, Maria Pugaczowa-Michalska, Lesław Smardz
{"title":"Influence of Interface Mixed Layer on Non-Collinear Exchange Coupling in V-Fe Multilayers.","authors":"Agnieszka Ranecka, Maria Pugaczowa-Michalska, Lesław Smardz","doi":"10.3390/ma18030697","DOIUrl":"10.3390/ma18030697","url":null,"abstract":"<p><p>V/Fe multilayers were prepared on naturally oxidized Si(100) substrates at room temperature (RT) by UHV magnetron sputtering. Mixing effects at the Fe-V interfaces were investigated in-situ, directly after deposition, by means of X-ray photoelectron spectroscopy (XPS). The results of systematic in-situ XPS studies of the integral intensity of the Fe-2p peak, as a function of the nominal thickness of the Fe sublayer deposited on vanadium, allowed us to estimate the thickness of the pure iron layer that forms the mixed layer at about 0.4 nm. Assuming the same thickness of the vanadium layer that forms the mixed layer, the estimated thickness of the mixed layer near the Fe-V interface was about 0.8 nm. In the analysis of magnetic hysteresis loops, in addition to the bilinear (J<sub>1</sub>) and biquadratic (J<sub>2</sub>) coupling constant, the contribution of the cubic exchange constant (J<sub>3</sub>) was taken into account, which also contributed significantly to the total energy. Higher order interactions (J<sub>2</sub> and J<sub>3</sub>) are particularly important for V spacer thicknesses greater than 7 atomic monolayers. Hydrogen absorption in V/Fe multilayers at RT and a pressure of about 1 bar causes an increase in the biquadratic coupling constant J<sub>2</sub>, while the values of J<sub>1</sub> and J<sub>3</sub> are reduced. A comparison of the obtained experimental results and available theoretical models leads to the conclusion that the mechanism of \"fluctuating thickness of the non-magnetic spacer\" could be responsible for the biquadratic exchange coupling. On the other hand, the \"loose spins\" model can explain the cubic coupling in the V/Fe multilayers. The modification of the interlayer exchange coupling using hydrogen is fully reversible.</p>","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11820266/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408839","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
Dental Implant with Porous Structure and Anchorage: Design and Bench Testing in a Calf Rib Model Study.
IF 3.1 3区 材料科学
Materials Pub Date : 2025-02-05 DOI: 10.3390/ma18030700
Keila Lovera, Vicente Vanaclocha, Carlos M Atienza, Amparo Vanaclocha, Pablo Jordá-Gómez, Nieves Saiz-Sapena, Leyre Vanaclocha
{"title":"Dental Implant with Porous Structure and Anchorage: Design and Bench Testing in a Calf Rib Model Study.","authors":"Keila Lovera, Vicente Vanaclocha, Carlos M Atienza, Amparo Vanaclocha, Pablo Jordá-Gómez, Nieves Saiz-Sapena, Leyre Vanaclocha","doi":"10.3390/ma18030700","DOIUrl":"10.3390/ma18030700","url":null,"abstract":"<p><p>Primary dental implant stability is critical to enable osseointegration. We assessed the primary stability of our newly designed dental implant. We used the calf rib bone animal model. Our implant has an outside tapered screw with two inside barrettes that deploy with a second screw situated at the implant's crown. We used ten calf ribs with III/IV bone density and inserted ten implants per rib. We deployed the barrettes in the calf rib's transversal direction to support against the nearby cortical bone. We measured the primary implant's stability with resonance frequency analysis and collected the Implant Stability Quota (ISQ) in the transverse and longitudinal calf rib planes before (PRE) and after (POS) deploying the barrette. The mean ISQ was PRE 84.00 ± 3.56 and POS 84.73 ± 4.53 (<i>p</i> = 0.84) in the longitudinal plane and PRE 81.80 ± 2.74 and POS 83.53 ± 4.53 (0.27) in the transverse plane. The barrettes' insertion increases our dental implant primary stability by 11% in the transverse plane and 2% in the longitudinal plane. Our dental implant ISQ values are in the higher range than those reported in the literature and reflect high primary stability after insertion. The barrette deployment improves the dental implant's primary stability, particularly in the direction in which it deploys (transverse plane).</p>","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11820065/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408865","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
A New Type of Self-Compacting Recycled Pervious Concrete Under Sulfate Drying-Wetting Exposure.
IF 3.1 3区 材料科学
Materials Pub Date : 2025-02-05 DOI: 10.3390/ma18030704
Xiancui Yan, Zimo He, Qun Xia, Cen Zhao, Pinghua Zhu, Meirong Zong, Minqi Hua
{"title":"A New Type of Self-Compacting Recycled Pervious Concrete Under Sulfate Drying-Wetting Exposure.","authors":"Xiancui Yan, Zimo He, Qun Xia, Cen Zhao, Pinghua Zhu, Meirong Zong, Minqi Hua","doi":"10.3390/ma18030704","DOIUrl":"10.3390/ma18030704","url":null,"abstract":"<p><p>Traditional pervious concrete poses significant challenges in optimizing both mechanical properties and permeability. To address this issue, a novel type of self-compacting recycled pervious concrete (SCRPC) featuring vertical and penetrating channels has been developed. The vertical channels were created by pulling out the reinforcement in the pre-drilled holes that were artificially created in the mold, after the concrete had been poured. However, whether this concrete has superior durability and can be employed in different sulfate drying-wetting situations remains to be investigated. This study explored the sulfate resistance and permeability of SCRPC under five drying-wetting exposure regimes: full soaking in Na<sub>2</sub>SO<sub>4</sub> solution with drying-wetting ratios of 3:18, 9:12, and 18:3; semi-soaking in Na<sub>2</sub>SO<sub>4</sub> solution; and full soaking in MgSO<sub>4</sub> solution. The results showed that the SCRPC soaked in MgSO<sub>4</sub> solution suffered the largest compressive strength loss (13.4%) after 150 drying-wetting cycles. Furthermore, as the drying-wetting ratio increased, the sulfate degradation of the SCRPC increased. Despite the comparable relative dynamic modulus of elasticity of SCRPC after full soaking (95.54%) and semi-soaking (92.89%), ettringite and gypsum were identified as the predominant sulfate deterioration products of SCRPC, respectively. In contrast to the two stages for traditional pervious concrete, the effective porosity of SCRPC was divided into three stages during sulfate attack: an initial rapid decline stage, a subsequent increase stage, and a final slow decline stage. The permeability coefficient of SCRPC varied from 6.00 to 6.82 mm/s under different sulfate drying-wetting exposures. In summary, SCRPC has superior sulfate resistance and permeability, and it could be more applicable in environments containing Na<sub>2</sub>SO<sub>4</sub> compared to MgSO<sub>4</sub>. This study provides basic data for the enhancement and application of pervious concrete with artificial vertical and penetrating channels.</p>","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11820751/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408170","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
Boosting Electrooxidation of Ethanol by Nickel Addition to Metallic Glass Ribbon Precursors.
IF 3.1 3区 材料科学
Materials Pub Date : 2025-02-05 DOI: 10.3390/ma18030701
Jingjing Song, Bo Zhang, Yu Chen, Qingzhuo Hu, Fabao Zhang, Langxiang Zhong
{"title":"Boosting Electrooxidation of Ethanol by Nickel Addition to Metallic Glass Ribbon Precursors.","authors":"Jingjing Song, Bo Zhang, Yu Chen, Qingzhuo Hu, Fabao Zhang, Langxiang Zhong","doi":"10.3390/ma18030701","DOIUrl":"10.3390/ma18030701","url":null,"abstract":"<p><p>A CuNiCe-O nanocomposite was fabricated on the Cu<sub>40</sub>Ni<sub>20</sub>Al<sub>10</sub>Ce<sub>26</sub>Pt<sub>3</sub>Ru<sub>1</sub> metallic glass (MG) ribbon surface by dealloying. The influences of Ni and dealloying time on the morphology and EOR performance were analyzed. The results suggest that the catalytic activity and stability of the dealloyed MG ribbon could be significantly enhanced owing to the alloying of Ni to the Cu<sub>60</sub>Al<sub>10</sub>Ce<sub>26</sub>Pt<sub>3</sub>Ru<sub>1</sub> MG ribbon precursor. The activated D-Cu<sub>40</sub>Ni<sub>20</sub>Al<sub>10</sub>Ce<sub>26</sub>Pt<sub>3</sub>Ru<sub>1</sub> ribbon obtained at an etching time of 3 h had a better electrochemical ethanol oxidation reaction (EOR) performance than other dealloyed samples due to the formation of abundant active sites and the presence of defects within the CuNiCe-O composite.</p>","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11821255/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143408751","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
Microstructure Evolution of Rapid Solidified Invar Alloy. 快速凝固因瓦合金的微观结构演变
IF 3.1 3区 材料科学
Materials Pub Date : 2025-02-05 DOI: 10.3390/ma18030691
Hanxin He, Zhirui Yao, Junfeng Xu, Xianzhe Shi, Xuyang Li
{"title":"Microstructure Evolution of Rapid Solidified Invar Alloy.","authors":"Hanxin He, Zhirui Yao, Junfeng Xu, Xianzhe Shi, Xuyang Li","doi":"10.3390/ma18030691","DOIUrl":"10.3390/ma18030691","url":null,"abstract":"<p><p>Invar alloy has a wide range of applications in aerospace and precision instruments. However, the microstructure evolution during rapid solidification is not yet fully understood. In this study, the rapid solidification microstructure of Invar alloy with undercooling ranging from 5 K to 231 K was investigated using optical microscopy, EBSD, and TEM techniques. The results show that, as the undercooling increased from 5 K to 181 K, the microstructure transitioned from large dendrites to columnar grains and finally to small equiaxed grains. When the undercooling ranged from 181 K to 193 K, the grain size suddenly increased before continuing to decrease with further undercooling. EBSD analysis revealed that, for ΔT > 181 K, two distinct types of grains appeared in the microstructure: one larger and the other much smaller. Under low undercooling conditions, the grains grew anisotropically with a preferred orientation, while under high undercooling, there was no apparent preferred growth orientation. Many twin boundaries were observed in the high-undercooling samples, which were further confirmed by TEM analysis. Additionally, both twin boundaries and high-angle grain boundaries increased gradually with undercooling.</p>","PeriodicalId":18281,"journal":{"name":"Materials","volume":"18 3","pages":""},"PeriodicalIF":3.1,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11819713/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143409029","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
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