Materials Science最新文献

{"title":"Mechanical Properties of Recycled Concrete with Polypropylene Fiber and Its Bonding Performance with Rebars","authors":"Shuping Sun, Yufen Du, Shuping Sun, Qingxian Yu, Yongchun Li","doi":"10.5755/j02.ms.35924","DOIUrl":"https://doi.org/10.5755/j02.ms.35924","url":null,"abstract":"This paper explores the influence of polypropylene fiber on the mechanical properties of recycled concrete and the bonding performance between recycled concrete and steel bars. The results indicate that the compressive strength and splitting tensile strength of concrete decrease with the increase in the replacement rate of recycled aggregate. When the replacement rate of recycled aggregate was 100 %, the compressive strength of concrete decreased by 25.0%, while the splitting tensile strength of concrete decreased by 21.7 %. The compressive strength and splitting tensile strength of recycled aggregate concrete show a trend of first increasing and then decreasing with increasing fiber content. When the fiber content is 0.09 %, the compressive strength and tensile strength of recycled aggregate concrete are optimal. The bond strength of recycled concrete pullout specimens with fiber is higher than that of recycled concrete pullout specimens without fiber, while the slip of recycled concrete pullout specimens with fiber is lower than that of recycled concrete pullout specimens without fiber. The maximum improvement in bonding performance between recycled concrete and rebars with a 50 % recycled aggregate replacement rate is 13.7 %, and the maximum improvement in bonding performance between recycled concrete and rebars with a 100 % recycled aggregate replacement rate is 11.8 %. The bond strength shows a trend of first increasing and then decreasing with increasing fiber content, but the degree of decrease was not significant, while the slip shows a trend of first decreasing and then increasing with increasing fiber content. Compared to the compressive strength of concrete, the splitting tensile strength can better reflect the bond strength between concrete and rebar. The nonlinear relationship between the bond strength, compressive strength, and splitting tensile strength of recycled concrete is established. This study can effectively improve the mechanical properties of recycled concrete, expand the application scope of recycled concrete technology, and promote the sustainable development of the construction industry.","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140730780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Refinement of Nanoporous Cu by Polyvinylpyrrolidone and Photodegradation of Methyl Orange by Cu2O Nanowires and Nanoporous Cu Photocatalysts","authors":"Zhuxu Xu, Yun LI, Fengxiang Qin, Z. Dan","doi":"10.5755/j02.ms.35363","DOIUrl":"https://doi.org/10.5755/j02.ms.35363","url":null,"abstract":"Refinement of nanoporous Cu (NP Cu) by the addition of Polyvinylpyrrolidone (PVP) in HF solution during dealloying of Ti40.6Zr9.4Cu40.6Ni6.3Sn3.1 amorphous ribbons and effect of the surface coverage of Cu2O nanowires obtained by immersing NP Cu in dehydrated ethanol on the photodegradation of methyl orange (MO) pollutants were investigated. The sizes of pores and ligaments of NP Cu decrease significantly with the increase of PVP concentration in the dealloying solutions, accompanied by a drastic decrease in the surface diffusivity and the dislocation defect densities. The surface coverage of Cu2O nanowires becomes higher with an increase of the PVP reagents. The Cu2O nanowires@nanoporous Cu (Cu2O@NP Cu) catalysts show excellent photocatalytic activity towards the degradation of MO under the sunlight due to the existence of large amounts of heterojunctions between Cu2O nanowires and Cu ligaments in nanoscale.","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140211086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of the Endurance Limit of Cooled Blades of Gas-Turbine Engines Made of Heat-Resistant Nickel Alloy","authors":"Yu. H. Kvasnytska, L. M. Ivaskevych, A. I. Balitskii, H. P. Mialnitsa, K. H. Kvasnytska","doi":"10.1007/s11003-024-00783-w","DOIUrl":"https://doi.org/10.1007/s11003-024-00783-w","url":null,"abstract":"<p>The characteristics of fatigue failure of the working blades of the first stage of the high-pressure turbine of the power gas-turbine engine were determined. Experimental studies were carried out on blades obtained according to the improved technology from the CM88Y alloy, which is used in the serial production of gas-turbine units. The blades withstood the test base of 1×10⁷ cycles at a stress of 200–240 MPa. The established endurance limit corresponded to the given service life of blades of this type.</p>","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140155551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanism of Development of Damage of Low-Strength Pipe Steel Due to Hydrogenation Under Operation","authors":"O. I. Zvirko, M. I. Hredil, O. T. Tsyrulnyk, O. Z. Student, H. M. Nykyforchyn","doi":"10.1007/s11003-024-00778-7","DOIUrl":"https://doi.org/10.1007/s11003-024-00778-7","url":null,"abstract":"<p>Resistance of pipe steels to hydrogen embrittlement is an important indicator of their serviceability. Pipes are manufactured from steels of a wide strength range. With the strength increase, a susceptibility to hydrogen embrittlement in general increases. This regularity is usually true for steels in the as-received state; however, the long-term operation can increase hydrogen susceptibility even of low- strength steels. This is caused by the development of damage dissipated in the metal bulk with the formation of voids due to deformation caused by high-pressure recombined hydrogen in them. Implementation of the hydrogen-induced damage mechanism, associated with the formation of deformation voids, extends the strength range of pipe steels, which become prone to operational hydrogen embrittlement.</p>","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140155578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Surface Modification of Titanium by Oxidation Followed by Electrospark Alloying with a Graphite Electrode","authors":"I. M. Pohrelyuk, M. M. Student, Kh.R. Zadorozhna, V. S. Trush, T. M. Kravchyshyn","doi":"10.1007/s11003-024-00784-9","DOIUrl":"https://doi.org/10.1007/s11003-024-00784-9","url":null,"abstract":"<p>The characteristics of the modified layer of commercially pure BT1-0 titanium (c.p. BT1-0 titanium) after oxygen thermal diffusion saturation (oxidation) and subsequent electrospark alloying (ESA) with a graphite electrode were analyzed. The phase composition of surface layers, their hardness and tribological properties were studied. It was shown that both surface electrospark alloying of titanium with a graphite electrode and combined processing (oxidation followed by ESA) improve its tribological characteristics during friction without lubrication. As a result, the friction coefficient decreases from 0.4–0.5 to 0.15–0.17. At the same time, the wear resistance of titanium increases in 1.2–2.9 times.</p>","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140156943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Peculiarities of Preparation and Properties of Cemented Carbide WC + 20 Mass% Ni with Ultra-Coarse-Grained Microstructure","authors":"O. O. Matviichuk, I. V. Andreiev, N. V. Litoshenko, M. O. Tsysar, V. A. Vynar, I. O. Hnatenko, S. A. Davydenko, I. V. Savchuk","doi":"10.1007/s11003-024-00786-7","DOIUrl":"https://doi.org/10.1007/s11003-024-00786-7","url":null,"abstract":"<p>The influence of the conditions of original components mixing and sintering temperatures on the peculiarities of microstructure formation of the cemented carbide WC + 20 mass% Ni prepared of ultra-coarse-grained (80/40 μm) tungsten carbide particles is investigated. The metallographic analysis shows that for the formation of such hard alloy microstructure, it is sufficient to use liquid phase sintering and preliminary economical wet mixing of WC with Ni powder. The strength under bending and compression is 1530 and 1720 MPa, respectively, the density is 13.51 g/cm³, and the hardness is 76 HRA. For the first time, the compressive stress-compression strain curve for this alloy with an average carbide grain size of 20 μm is experimentally obtained. The alloy plasticity is 6 times higher than that of the alloys prepared under other technological modes.</p>","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140155399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Structural-Mechanical State of 12Kh1MF Steel of TPP Pipeline Bend after Long-Term Operation","authors":"I. O. Tsybailo, H. V. Krechkovska","doi":"10.1007/s11003-024-00780-z","DOIUrl":"https://doi.org/10.1007/s11003-024-00780-z","url":null,"abstract":"<p>The mechanical characteristics and structural features of the heat-resistant 12Kh1MF steel after long-term operation in a bend of the TPP (thermal power plants) steam pipelines were analyzed. The change in the technical state of the metal of different zones of the bend and the anisotropy of properties across the pipe wall thickness were established. It was found that in the stretched zone of the bend near the outer surface of the pipe the steel degraded more intense than in other zones, which was due to the most favorable operating conditions for creep.</p>","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140155579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrogen Generation by Hydrolysis of Magnesium Hydride Composites with TiFe/Ti3Fe3O Additives and Graphite","authors":"O. P. Kononiuk, I. Yu. Zavaliy, V. V. Berezovets, A. R. Kytsia, I. V. Borukh","doi":"10.1007/s11003-024-00779-6","DOIUrl":"https://doi.org/10.1007/s11003-024-00779-6","url":null,"abstract":"<p>Hydrides of magnesium composites with additives of intermetallic TiFe and suboxide Ti₃Fe₃O were synthesized by mechanical milling in a hydrogen atmosphere. The addition of graphite reduces the particle size of the composites. The influence of catalytic additives and graphite on the hydrolysis of magnesium hydride was studied. The dependence of the amount of hydrogen obtained by hydrolysis on the time of composite milling was found.</p>","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140155583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Influence of Polyvinylpyrrolidone as a Polymer Modifier on the Morphology and Properties of Copolyamide","authors":"T. V. Humenetskyi, A. S. Masiuk, V. Ye. Levitskyi, L. M. Bilyi","doi":"10.1007/s11003-024-00788-5","DOIUrl":"https://doi.org/10.1007/s11003-024-00788-5","url":null,"abstract":"<p>Peculiarities of copolyimide modification by polyvinylpyrrolidone in a viscous state were studied. The differential scanning calometry revealed changes in the morphology and phase transitions of modified copolyamide materials. The increased technological compatibility between the components of copolyamide-polyvinyl pyrrolidone mixture was established. The effect of the modifier on the strength and thermophysical properties of the studied thermoplastic was found. Introduction of polyvinylpyrrolidone contributes to the growth of copolyamide strength under rupture and relative elongation and leads to a certain decrease in Vicat softening point and change of copolyamide technological properties.</p>","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140155584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrosion Activity of Low-Carbon Steel Under the Action of Multi-Component Anti-Icing Reagent","authors":"I. V. Kravchenko, O. V. Suvorin, H. O. Tatarchenko","doi":"10.1007/s11003-024-00776-9","DOIUrl":"https://doi.org/10.1007/s11003-024-00776-9","url":null,"abstract":"<p>Corrosion activity of a multi-component solution, namely, distiller liquid previously clarified and strengthened to 20 wt% by CaCl₂ including the addition of corrosion inhibitors at –5°C to low-carbon 08kp steel is studied by the gravimetric method. The holding time of the specimens is 500–650 h. In distiller liquid corrosion rate is 0.111 g/(m²×h), corrosion depth is 0.12 mm/year, steel resistance refers to the IV group (relatively resistant). When adding the hexamethylenetetramine, triethanolamine, trilon B corrosion inhibitors or their mixture in the amount of 0.5 wt% the corrosion resistance of steel improves, and the best results are achieved by adding hexamethylenetetramine with triethanolamine. The obtained results indicate the possibility of using the distiller liquid from sludge accumulator of JSC “Lysychanska Soda” with additives of such corrosion inhibitors as reagents for preventing highway surface against icing.</p>","PeriodicalId":18230,"journal":{"name":"Materials Science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140155439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}