Materials Research Express最新文献_第2页

Effect of T6I6 tempering on the coherence between core/shell precipitates and a solid solution in the 2024 aluminium alloy T6I6 回火对 2024 铝合金中核/壳沉淀与固溶体之间相干性的影响

Materials Research Express Pub Date : 2024-07-19 DOI: 10.1088/2053-1591/ad65ba

Mariusz Stegliński, A. Petrova, Irina Brodova, B. Adamczyk‐Cieślak

{"title":"Effect of T6I6 tempering on the coherence between core/shell precipitates and a solid solution in the 2024 aluminium alloy","authors":"Mariusz Stegliński, A. Petrova, Irina Brodova, B. Adamczyk‐Cieślak","doi":"10.1088/2053-1591/ad65ba","DOIUrl":"https://doi.org/10.1088/2053-1591/ad65ba","url":null,"abstract":"\u0000 Heat treatment of materials, including, in particular, the two-stage T6I6 treatment, enables the nucleation of precipitates with a two-phase structure: core and shell. The above-mentioned treatment can be used to harden materials by selecting suitable treatment parameters and chemical composition of the material that initiate a selective diffusion of the alloying elements. In this paper, tests of the T6I6 treatment were carried out on the EN AW-2024 alloy. The aluminium alloy was subject to T6I6 treatment and then the element distribution map was examined within the precipitate using the EDS method, mechanical properties of the precipitate were tested using the nanoindentation method and the kinetics of formation of the precipitate was analysed using DSC. The impact of two-phase precipitates on the mechanical properties has been determined through a static strength test, whereas the impact of the structure on the above-mentioned mechanical properties was determined based on HR-TEM observations. The results of the study confirm the formation of a precipitate with a two-phase structure (shell; core) in the EN AW-2024 alloy as well as the kinetics of their formation as a function of the parameters of the T6I6 process, such as temperature, duration and cooling rate. Strength tests have confirmed an increase in strength of the alloy to Rm = 520 MPa, with elongation remaining the same at A = 13.2%. HR-TEM observations, in turn, prove that the shell forming on the core is coherent with solid solution α, which means that the hardening of the alloy may occur as a sum of the Mott-Nabarro, Friedel and Ashby-Orowan mechanisms.","PeriodicalId":510378,"journal":{"name":"Materials Research Express","volume":"119 40","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141822259","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

Effects of surface hardening by laser shock peening and shot peening on a nickel-based single-crystal superalloy CMSX-4 激光冲击强化和喷丸强化对镍基单晶超合金 CMSX-4 表面硬化的影响

Materials Research Express Pub Date : 2024-07-18 DOI: 10.1088/2053-1591/ad6535

Aabid Husen Hakeem, N. I. Morar, Karl Dawson, G. Tatlock, Grant J. Gibson, Simon Gray

{"title":"Effects of surface hardening by laser shock peening and shot peening on a nickel-based single-crystal superalloy CMSX-4","authors":"Aabid Husen Hakeem, N. I. Morar, Karl Dawson, G. Tatlock, Grant J. Gibson, Simon Gray","doi":"10.1088/2053-1591/ad6535","DOIUrl":"https://doi.org/10.1088/2053-1591/ad6535","url":null,"abstract":"\u0000 Improving the expected life of nickel-based single-crystal superalloy turbine components by surface hardening treatments including laser shock peening (LSP) and mechanical shot peening (MSP) are of particular interest for mitigation of life limiting damage such as environmental assisted cracking in hot section components of gas turbines. In the present study the effects of LSP and MSP on the surface roughness, microhardness and work hardening of a nickel-based single crystal superalloy CMSX-4® have been assessed. Surface roughness was measured using laser profilometry. The degree of work hardening was measured using electron backscattered diffraction with local misorientation analysis. The analysis showed evidence for a work hardening layer in the MSP sample to a depth of approximately 70 m. Sets of slip bands extending far into the bulk of the sample were observed in the LSP-treated sample, without any evidence of a work hardening layer. Microhardness measurements used to gauge the depth of residual stress showed that LSP produced a much deeper hardness profile than MSP, with compressive residual stress depths of 1000 µm and 200 µm in LSP and MSP respectively. The retention of hardness after a heat treatment of 50 h at 700 °C was more prominent in the LSP sample than in the MSP sample. LSP and MSP have therefore been shown to be at the opposite ends of the spectrum of surface hardening treatments of CMSX-4, with LSP giving milder hardening, but to a greater depth.","PeriodicalId":510378,"journal":{"name":"Materials Research Express","volume":" 37","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141824324","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

Incorporation of Ni in Cu2SnSe3: An insight into the reduction in electrical resistivity 在 Cu2SnSe3 中掺入镍：深入了解电阻率的降低

Materials Research Express Pub Date : 2024-07-18 DOI: 10.1088/2053-1591/ad6534

Rohith Jagan, Twinkle Gurung, Deepika Shanubhogue U, G. Poojitha, P. P, Ashok Rao

引用次数: 0

Magnetically tuned thermoelectric properties of metal-oxides: A review 金属氧化物的磁调热电特性：综述

Materials Research Express Pub Date : 2024-07-18 DOI: 10.1088/2053-1591/ad6533

D. P. Dubey, Ratnamala Chatterjee

引用次数: 0

Comparing the impact of various sterilization methods on the cyclic fatigue resistance, bending strength, and torsional fatigue properties of NiTi rotary files 比较各种消毒方法对镍钛旋转锉的抗循环疲劳性能、弯曲强度和扭转疲劳性能的影响

Materials Research Express Pub Date : 2024-07-17 DOI: 10.1088/2053-1591/ad64ae

R. Almnea

{"title":"Comparing the impact of various sterilization methods on the cyclic fatigue resistance, bending strength, and torsional fatigue properties of NiTi rotary files","authors":"R. Almnea","doi":"10.1088/2053-1591/ad64ae","DOIUrl":"https://doi.org/10.1088/2053-1591/ad64ae","url":null,"abstract":"\u0000 This study aimed to evaluate the influence of various sterilization techniques on the cyclic fatigue resistance, bending strength, and torsional fatigue resistance of Tornado Blue and Race Evo rotary endodontic file systems. Both the file systems underwent a series of 15 cycles of sterilization according to the following study groups: control group (G1; i.e., without treatment), chemical sterilization with 5.25% sodium hypochlorite (G2), dry heat sterilization (G3), glass beads sterilization (G4), and steam autoclaving (G5). Each group consisted of 8 samples (n=8/group). Statistical analysis was performed using a two-way ANOVA and Tukey’s tests (p≤ 0.05). Mean values for the number of cycles between both files were 1291±52.79 rpm and 2095±52.91 rpm for Tornado Blue and Race Evo, respectively. The torsional fatigue resistance was 8.00±0.85 NCF and 10.70±0.85 NCF and the bending strength was 486.94±20.97 gf and 564.17 ±20.97 gf for Tornado Blue and Race Evo, respectively. The results showed no significant difference in the mechanical properties followed by different sterilization protocols. However, a significant difference was observed in tested properties between the two file systems (p≤ 0.05). The outcome is reassuring for clinicians that the essential process of routine sterilization at clinics seems safe with regards to mechanical integrity of the endodontic files.","PeriodicalId":510378,"journal":{"name":"Materials Research Express","volume":" 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141829586","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

Can pulsed laser treatment reduce microbial adhesion on the surface of resin denture base materials? 脉冲激光治疗能否减少树脂义齿基托材料表面的微生物附着？

Materials Research Express Pub Date : 2024-07-17 DOI: 10.1088/2053-1591/ad64b0

Runki Saran, Keerthi Kanneeram, U. V. K., Sajan D. George, R. Hariharapura, Nagaraja Upadhya P, K. Ginjupalli

{"title":"Can pulsed laser treatment reduce microbial adhesion on the surface of resin denture base materials?","authors":"Runki Saran, Keerthi Kanneeram, U. V. K., Sajan D. George, R. Hariharapura, Nagaraja Upadhya P, K. Ginjupalli","doi":"10.1088/2053-1591/ad64b0","DOIUrl":"https://doi.org/10.1088/2053-1591/ad64b0","url":null,"abstract":"\u0000 Objectives: The present work investigates the influence of pulsed nanosecond laser patterning of two commercial heat cure poly (methyl methacrylate) denture base materials, Trevalon and DPI heat cure, on their surface characteristics such as roughness, hydrophobicity, and microbial adhesion. Methods: A Q-switched Nd-YAG solid state nanosecond pulsed laser at a wavelength of 532 nm with a fluence of 2.55x1010 W/cm2 having a pulse frequency of 10 Hz was used at varying translation stage speed and vertical spacing for the surface patterning of denture base materials. The surface properties of control and patterned materials were characterized by measuring the compositional changes, wettability, and roughness. Microbial adhesion was assessed by incubating the specimens in Candida albicans suspension at 37°C for 2 hours followed by estimating the number of adherent Candida cells. Results: The micro-Raman spectroscopic studies indicated no chemical changes in the materials due to laser patterning. However, laser patterning increased the average surface roughness from 0.02 ± 0.005 and 0.04 ± 0.003 µm to 3.85 ± 0.20 µm and 3.70 ± 0.12 µm respectively for Trevalon and DPI heat cure materials. In addition, a reduction in the surface wettability was evident as manifested by an increase in water contact angle from 76 ± 2° to 105 ± 1° for Trevalon and from 72 ± 1° to 97 ± 1° for DPI heat cure. Finally, the microbial adhesion studies clearly indicated that the surfaces with higher hydrophobicity and roughness following laser patterning exhibited reduced microbial adhesion. Significance: Laser patterning can be utilized to tune the surface features of denture base materials and thus offer a promising method to create microbial adhesion resistant surfaces. Clinically, such surfaces help in reducing the incidence of denture stomatitis, especially in immunocompromised patients, without altering the composition and bulk properties of denture base materials.","PeriodicalId":510378,"journal":{"name":"Materials Research Express","volume":" 39","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141830322","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

Analysis of Strength Characteristics and Microstructure of Alkali-activated Slag Cement Fluidized Solidified Soil 碱活性矿渣水泥流化固化土的强度特性和微观结构分析

Materials Research Express Pub Date : 2024-07-17 DOI: 10.1088/2053-1591/ad64b1

Lin Liu, Shan San Chen, Feng Chen, Liang He, Shinlin Shen

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Hetero-core fiber-optic surface plasmon resonance sensor with ionic liquid gel coating for CO2 sensing 带有离子液体凝胶涂层的异芯光纤表面等离子体共振传感器用于二氧化碳传感

Materials Research Express Pub Date : 2024-06-14 DOI: 10.1088/2053-1591/ad58ab

Yoshimi Kosugi, Mitsuhiro Suzuki, M. Nishiyama, Kazuhiro Watanabe, Junichi Ida

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Preparation and Thermal Performance Testing of Diatomite-Modified Asphalt Pavements 硅藻土改性沥青路面的制备和热性能测试

Materials Research Express Pub Date : 2024-06-14 DOI: 10.1088/2053-1591/ad58ac

Guangzhen Hou, Qun Wu

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Ab-Initio study of substitution at alkaline earth site on quaternary heusler alloys LiXNiSb 碱土位点在四价楠镍钴合金上的取代的 Ab-Initio 研究

Materials Research Express Pub Date : 2024-06-14 DOI: 10.1088/2053-1591/ad58aa

Jagdish Kumar, Manish Kumar, D. K. Raman, Anand Pal

引用次数: 0