Journal of Alloys and Compounds最新文献_第5页

Tuning pores and mechanical properties for the heterogeneous interface of laser directed energy deposited IN718/316 L laminate via in-situ laser surface remelting

IF 6.2 2区材料科学

Journal of Alloys and Compounds Pub Date : 2024-11-30 DOI: 10.1016/j.jallcom.2024.177872

Jiantao Zhou, Luyao Shen, Xiao Yang, Rui Li, Kewen Pan

{"title":"Tuning pores and mechanical properties for the heterogeneous interface of laser directed energy deposited IN718/316 L laminate via in-situ laser surface remelting","authors":"Jiantao Zhou, Luyao Shen, Xiao Yang, Rui Li, Kewen Pan","doi":"10.1016/j.jallcom.2024.177872","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177872","url":null,"abstract":"In the past decades, laser directed energy deposition (L-DED) of multi-material attracts much attention for the integration of structure and performance. However, interfacial pores and limited mechanical properties are still bottlenecks. The present study introduces the in-situ laser surface remelting (LSR) treatment to L-DED of IN718/316 L laminate. During the LSR process, the continuous-wave (CW) near-infrared fiber printing laser rescans the whole surface after completely depositing the bottom material. When the bottom material was selected as 316 L and IN718, the pores around the heterogeneous interface were obviously eliminated and the proportion of high angle grain boundaries (HAGBs) was respectively lifted by 85.1% and 149.1% with slightly reduced average grain diameter after LSR treatment. Eventually, 8.5% and 58.9% increase in the elongation were respectively achieved. According to the numerical investigation, the “pinch-off” of bubble is observed during LSR process for the first time and the necking is enhanced with increased remelting laser power when the bottom material is IN718. Furthermore, the pore below the molten pool is prone to enlarge with stress concentration. This work can provide a novel guidance for the defect-free AM-built laminate.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"8 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142752970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Correlation between the Structural, Morphological, Optical, Nanomechanical, and Tribological Properties of ZnO Films by USPT with Their Photocatalytic Activities

IF 6.2 2区材料科学

Journal of Alloys and Compounds Pub Date : 2024-11-30 DOI: 10.1016/j.jallcom.2024.177885

Meryem POLAT GONULLU, Hanifi CİNİCİ, Cemil CETİNKAYA, Suleyman TEKELI, Bulent BOSTAN, Damla Dilara CAKIL

{"title":"Correlation between the Structural, Morphological, Optical, Nanomechanical, and Tribological Properties of ZnO Films by USPT with Their Photocatalytic Activities","authors":"Meryem POLAT GONULLU, Hanifi CİNİCİ, Cemil CETİNKAYA, Suleyman TEKELI, Bulent BOSTAN, Damla Dilara CAKIL","doi":"10.1016/j.jallcom.2024.177885","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177885","url":null,"abstract":"The present work focused on studying the nanomechanical properties of ZnO thin films deposited on glass substrates using the ultrasonic spray pyrolysis technique. Structural and morphological properties are related to processing conditions, which affect mechanical, optical, and photocatalytic properties. To produce the ZnO films, three different molarities of spraying solution have been used which are 0.05 M; 0.075; and 0.10. The increase in the concentration of the spray solution led to an improvement in the crystal structure with the average crystallite size increasing from 28 nm to 35 nm. Morphological investigations revealed that the spherical nanoparticles with various size distributions. The rough surface topology emerged as a result of increasing solution molarity. Optical band gap values of the films decreased from 3.29 to 3.27 eV. Photocatalytic efficiency reached 93% for ZnO film produced at higher solution molarity. Improved hardness values were determined for all films. Scratch tests showed better adhesion behavior for ZnO film at low solution molarity. Results indicate that solution molarity is an important parameter of the physical and photocatalytic properties of ZnO films as well as mechanical behaviors.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"27 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142753555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Blue light excitable efficient down-conversion photoluminescence of Yb3+ and Er3+ in ultra-wide NIR region via Cr3+-Yb3+-Er3+ energy transfer in KAlP2O7 and multifunctional applications

IF 6.2 2区材料科学

Journal of Alloys and Compounds Pub Date : 2024-11-30 DOI: 10.1016/j.jallcom.2024.177842

Changshuai Gong, Sihan Yang, Qian Zhang, Jian He, Xuejiao Wang

{"title":"Blue light excitable efficient down-conversion photoluminescence of Yb3+ and Er3+ in ultra-wide NIR region via Cr3+-Yb3+-Er3+ energy transfer in KAlP2O7 and multifunctional applications","authors":"Changshuai Gong, Sihan Yang, Qian Zhang, Jian He, Xuejiao Wang","doi":"10.1016/j.jallcom.2024.177842","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177842","url":null,"abstract":"Broadband near-infrared (NIR) phosphors have gained growing interest in applications such as food detection, plant growth and night vision lighting. However, designing NIR phosphors with large full width at half maximum (FWHM) is challenging. In this study, we introduce a novel blue light excitable Cr3+-Yb3+-Er3+ tri-doped KAlP2O7 (KAPO) phosphor, which exhibits luminescence in ultra-wide NIR region, including broadband NIR-II luminescence with the FWHM of 302 nm and sharp NIR-III luminescence at 1538 nm. Fluorescence decay curves confirmed the presence of energy transfer. In addition, the NIR optical thermometry was developed using the non-thermally coupled energy states of 4T2→4A2 (Cr3+) and 4I13/2→4I15/2 (Er3+), with the highest absolute (SA) and relative sensitivity (SR) values determined to be 122.2 × 10−4 K−1 (T = 473 K) and 0.76% K−1 (T = 448 K), respectively. In addition,the prepared phosphor can be efficiently excited by various wavelengths including 377 nm ultraviolet light, 468 nm blue light, and 808/980 nm near infrared light, suggesting its promising applications in anti-counterfeiting. The NIR phosphor-converted LED (pc-LED) was fabricated using KAPO: 0.01Cr3+, 0.002Yb3+, 0.01Er3+ phosphor and a 470 nm LED chip, demonstrating notable potential in night vision technology.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"389 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142752918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Two-step preparation and characterization of Bi-2212 superconductors by the glycine-nitrate method

IF 6.2 2区材料科学

Journal of Alloys and Compounds Pub Date : 2024-11-30 DOI: 10.1016/j.jallcom.2024.177868

Nan Wang, Tianlin Wang, Muyan Dai, Ming Yi, Huazhe Yang, Bowen Zhang

{"title":"Two-step preparation and characterization of Bi-2212 superconductors by the glycine-nitrate method","authors":"Nan Wang, Tianlin Wang, Muyan Dai, Ming Yi, Huazhe Yang, Bowen Zhang","doi":"10.1016/j.jallcom.2024.177868","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177868","url":null,"abstract":"In order to prepare high-quality sub-stable copper oxide superconductor Bi-2212, the glycine-nitrate method combined with rapid sintering process was used in this paper. Firstly, the glycine-nitrate method was used to obtain highly active Bi-2212 precursor powders with uniform composition, and then Bi-2212 superconductor powders were prepared by rapid sintering. Glycine acted as a combustion agent while giving property of the complexation to ensure the homogeneity of multiple chemical components. The high-quality precursor powder was the basis for broadening the temperature interval of the pure phase of Bi-2212. And then the effects of precursor powder sampling pressure on Bi-2212 superconducting materials were systematically investigated. On this basis, the pure-phase temperature interval of Bi-2212 superconducting materials prepared by the nitroglycerin method was further investigated. The results showed that the increase of the sample preparation pressure can effectively optimize the crystallinity of Bi-2212, which no longer changed significantly after 300 MPa. The pure phase temperature interval of Bi-2212 was 830~880 °C. The samples showed the characteristic lamellar morphology. The optimum sintering temperature was 850°C. The crystal integrity of Bi-2212 was destroyed under high temperature sintering conditions, and the two-dimensional properties were enhanced. The superconducting properties of Bi-2212 were acceptable, with a Tc, onset of 82.1 K, Tc, zero of 72.4 K, and ΔTc of 9.7 K. This work largely reduces the difficulty in the preparation of the superconductors of Bi-2212, and it provides a good basis for the preparation of multi-component functional oxides by using the nitrate method.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"84 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142752971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Zn-doped Mn₃O₄ with lattice distortion as flexible cathode for zinc-ion hybrid supercapacitor

IF 6.2 2区材料科学

Journal of Alloys and Compounds Pub Date : 2024-11-30 DOI: 10.1016/j.jallcom.2024.177895

Shengjuan Li, Qian He, Fengyan Gao, Henghan Liu, Huifeng Gao, Yuhua Xue, Lei Li

引用次数: 0

Characterization of structure and photoluminescence properties for LiZn(B1-xAlx)O3 (x=0-1) oxides

IF 6.2 2区材料科学

Journal of Alloys and Compounds Pub Date : 2024-11-30 DOI: 10.1016/j.jallcom.2024.177862

Sean Wu, Lay-Gaik Teoh, Jia- Jin Chen, Yee-Shin Chang

引用次数: 0

Effect of composite magnetic microspheres and curing time on the corrosion and wear properties of phosphate ceramic coatings

IF 6.2 2区材料科学

Journal of Alloys and Compounds Pub Date : 2024-11-30 DOI: 10.1016/j.jallcom.2024.177866

Li Jiahong, Qian Shanhua, Bian Da, Xu Anlin, Ni Zifeng, Zhao Yongwu

{"title":"Effect of composite magnetic microspheres and curing time on the corrosion and wear properties of phosphate ceramic coatings","authors":"Li Jiahong, Qian Shanhua, Bian Da, Xu Anlin, Ni Zifeng, Zhao Yongwu","doi":"10.1016/j.jallcom.2024.177866","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177866","url":null,"abstract":"In order to enhance the corrosion and wear resistance of ceramic coatings in marine environment, different types of micro-nano structures were constructed on the surface of phosphate ceramic coatings by magnetic polystyrene (PS@Fe3O4) microspheres and curing time. Subsequently, the surface properties of the magnetic composite microspheres and coatings were characterized, and the corrosion and wear properties of the coatings were investigated. The results revealed that the microspheres were gradually decomposed with the increase of curing time, and the surface of the coating presented different micro-nano structure with convex, flat and concave. Compared to unstructured coating (NSC), the convex micro-nano structured coating (CXMNC) and concave micro-nano structured coating (CEMNC) possessed outstanding superhydrophobicity. Through three tests of the knife scraping, tape peeling and sandpaper abrasion, the coatings showed excellent bonding strength and mechanical durability. After a long immersion period (256 h), the impedance modulus of CXMNC and CEMNC were 27 and 15 times that of NSC, respectively. Compared with the NSC, the wear rate of CXMNC and CEMNC was reduced by 31.09% and 5.42%, respectively. Compared with the uncorroded samples, the wear rate of NSC, CXMNC and CEMNC after the immersion corrosion (30 days) was increased by 127.23%, 59.18% and 65.48%, respectively. Therefore, the micro-nano structured coatings have superior corrosion resistance and wear resistance to NSC, and CXMNC so as to CEMNC, which will provide better insight into the development of new corrosion-wear resistant materials.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"11 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142753185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Luminescence and scintillation characteristics of Ce3+ and Tb3+ co-doped SiO2 fiber for low-dose gamma radiation

IF 6.2 2区材料科学

Journal of Alloys and Compounds Pub Date : 2024-11-29 DOI: 10.1016/j.jallcom.2024.177840

Haoyu Li, Yollanda Bella Christy, Chao Xu, Xulin Luo, Yahui Li, Linfeng He, Qiang Guo, Gang-Ding Peng

{"title":"Luminescence and scintillation characteristics of Ce3+ and Tb3+ co-doped SiO2 fiber for low-dose gamma radiation","authors":"Haoyu Li, Yollanda Bella Christy, Chao Xu, Xulin Luo, Yahui Li, Linfeng He, Qiang Guo, Gang-Ding Peng","doi":"10.1016/j.jallcom.2024.177840","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177840","url":null,"abstract":"Ce3+ and Tb3+ co-doped SiO2 optical fibers (SCTF) were prepared using the modified chemical vapor deposition method. The optical and structural properties of the SCTF samples were investigated using refractive index measurements, energy dispersive X-ray spectroscopy, photoluminescence (PL), transmission loss, and fluorescence lifetime. The SCTF was fabricated into a radiation dosimeter, and its gamma radioluminescence (RL) response was studied over a dose rate range of 424.27 to 2095.16 mGy/min and a total dose range of 424.27 to 2095.16 mGy. The radiation response exhibited good linearity. To verify the repeatability of the dosimeter, repeated experiments were conducted at a fixed dose rate of 2095.16 mGy/min. The results demonstrated that the dosimeter has good repeatability. An energy transfer model in SCTF was established, and Ce/Tb-doped SiO2 was prepared using a sol-gel method. The energy transfer model was verified by measuring its PL spectrum. The above results verify that the SCTF shifts the RL to a longer wavelength due to the energy transfer of radioluminescence, which is more conducive to the remote sensing and transmission of SiO2 optical fiber in an irradiated environment.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"70 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142742517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Probing n-ZnMgO/p-Si nanowire junctions: Insights into composition, strain, and defects via Raman spectroscopy and electrical measurements

IF 6.2 2区材料科学

Journal of Alloys and Compounds Pub Date : 2024-11-29 DOI: 10.1016/j.jallcom.2024.177851

E. Zielony, G. Szalewska, M.A. Pietrzyk

{"title":"Probing n-ZnMgO/p-Si nanowire junctions: Insights into composition, strain, and defects via Raman spectroscopy and electrical measurements","authors":"E. Zielony, G. Szalewska, M.A. Pietrzyk","doi":"10.1016/j.jallcom.2024.177851","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177851","url":null,"abstract":"This article focuses on investigating physical properties of n-ZnMgO/p-Si heterojunctions containing ZnMgO nanowires (NWs) with ZnMgO/ZnO/ZnMgO quantum wells (QWs) grown by molecular beam epitaxy. Detailed analysis of chemical composition, crystal lattice strain, and defects in the structures was conducted via Raman spectroscopy, deep level transient spectroscopy (DLTS), and capacitance-versus-temperature characteristics, C(T). Additionally, current-voltage (I-V) curves were included to demonstrate the rectifying properties of the studied n-ZnMgO/p-Si NW junctions. The samples varied in the thicknesses of the ZnO QWs and the ZnMgO barriers. Raman spectra provided information on strain within the crystal lattice of the nanowires. The values of the biaxial in-plane strain were calculated for the selected samples, and the origin of this strain was discussed in detail. A broadened part of spectrum in the range of 480-600 cm-1 was ascribed to the contribution of <math><msub is=\"true\"><mrow is=\"true\"><mi is=\"true\">A</mi></mrow><mrow is=\"true\"><mn is=\"true\">1</mn></mrow></msub><mrow is=\"true\"><mfenced close=\")\" is=\"true\" open=\"(\"><mrow is=\"true\"><mi is=\"true\" mathvariant=\"italic\">LO</mi></mrow></mfenced></mrow></math> mode, which is associated with lattice defects such as oxygen vacancies, zinc interstitials, or their complexes. The presence of deep traps in the junctions was revealed by the DLTS method. Measurements of C(T) characteristics of the p-n junctions disclosed the presence of deep-level traps in the structures as well.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"7 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142742545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Critical Behavior of Cobalt-doped van der Waals Ferromagnet (Fe0.74Co0.26)3GeTe2

IF 6.2 2区材料科学

Journal of Alloys and Compounds Pub Date : 2024-11-29 DOI: 10.1016/j.jallcom.2024.177837

Shiqi Chang, Min Wang, Zhenqi Wu, Kui Yuan, Jiacheng Gao, Shuo Wang, Zhendong Wang, Kaifei Liu, Kai Gu, Ping Liu, Xiaoqian Zhang, Wei Niu

{"title":"Critical Behavior of Cobalt-doped van der Waals Ferromagnet (Fe0.74Co0.26)3GeTe2","authors":"Shiqi Chang, Min Wang, Zhenqi Wu, Kui Yuan, Jiacheng Gao, Shuo Wang, Zhendong Wang, Kaifei Liu, Kai Gu, Ping Liu, Xiaoqian Zhang, Wei Niu","doi":"10.1016/j.jallcom.2024.177837","DOIUrl":"https://doi.org/10.1016/j.jallcom.2024.177837","url":null,"abstract":"Two-dimensional (2D) van der Waals (vdW) ferromagnet Fe3GeTe2 (FGT) demonstrates considerable potential for applications in spintronics due to its relatively high Curie temperature (TC) and strong perpendicular magnetic anisotropy. Moreover, these demanding magnetic properties are sensitive to the Fe contents and can be effectively tuned by substituting Fe with other elements, especially the cobalt (Co) doping. Here, we delve into the magnetic critical behavior of the Co-doped vdW ferromagnet (Fe0.74Co0.26)3GeTe2 (FCGT). Utilizing a range of techniques including modified Arrott plots, Widom scaling method, the Kouvel-Fisher approach, and critical isotherm analysis, we derived reliable and self-consistent critical exponents: β = 0.360, γ = 1.043, δ = 3.87, with a TC of 134.3 K. These critical exponents of FCGT do not conform to a single theoretical model but instead lie between the Mean-field model and the three-dimensional Heisenberg one. Despite the distinct critical exponents, Co doping does not alter the critical behavior intrinsic to the FGT. Further investigation implies the FCGT sustains long-range magnetic interactions, as evidenced by the magnetic exchange distance decay of J(r) ≈ r-4.566. Our work could offer insights for the understanding of the macroscopic magnetic behavior of vdW ferromagnets doped with other transition metals.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"259 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142742546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0