Materials LettersPub Date : 2025-05-04DOI: 10.1016/j.matlet.2025.138688
Yanxin Cao , Shuai Xie , Zhijiang Ji , Ronghua Su , Jing Wang
{"title":"A novel camouflage coating for simulating the solar spectrum of green vegetation","authors":"Yanxin Cao , Shuai Xie , Zhijiang Ji , Ronghua Su , Jing Wang","doi":"10.1016/j.matlet.2025.138688","DOIUrl":"10.1016/j.matlet.2025.138688","url":null,"abstract":"<div><div>To realize the hyperspectral camouflage under the background of vegetation, a polyvinyl alcohol based camouflage coating incorporated with green pigment, calcium alginate fibers, lithium chloride and organic siloxane. The water absorption, reflection spectrum, mechanical property and morphology of the coating were investigated. The results demonstrated that the similarity coefficient and the cosine of spectral angle between the coating and green leaves can reach 0.9612 and 0.9891, respectively, in the range of 200–2400 nm. Meanwhile, the fracture strength of the coating achieves 13.11 MPa. The developed coating possesses remarkable application potential in the field of hyperspectral camouflage to improve the survivability of soldiers and equipment on the battlefields.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"395 ","pages":"Article 138688"},"PeriodicalIF":2.7,"publicationDate":"2025-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908145","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}
Materials LettersPub Date : 2025-05-03DOI: 10.1016/j.matlet.2025.138684
Jiapeng Wu , Kun Yu , Yifeng Wang , Zhijun Li , Wenzhu Zhang , Mingqiang Xie , Lin Kong
{"title":"Vacuum brazing-induced dissolutive mechanisms in AgCuTi/Cu system","authors":"Jiapeng Wu , Kun Yu , Yifeng Wang , Zhijun Li , Wenzhu Zhang , Mingqiang Xie , Lin Kong","doi":"10.1016/j.matlet.2025.138684","DOIUrl":"10.1016/j.matlet.2025.138684","url":null,"abstract":"<div><div>This study investigates the time–temperature-dependent dissolutive behavior of copper using Ag-26.5Cu-1.5Ti (wt%) alloy powder. Prolonged thermal exposure under vacuum conditions causes significant Cu dissolution. Microstructural stratification reveals two distinct zones: Zone I dominated by Cu(s,s), Ag-Cu eutectic phase and Zone II containing Cu(s,s), Ag-Cu eutectic phase, Ti<sub>2</sub>Cu and TiCu. Analysis demonstrates near-equilibrium dissolution attainment within 30 min at 880 °C. A four-stage dissolutive mechanism is proposed.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"395 ","pages":"Article 138684"},"PeriodicalIF":2.7,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908019","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}
Materials LettersPub Date : 2025-05-03DOI: 10.1016/j.matlet.2025.138686
Xinyu Zhang , Yongfeng Liang , Gengwu Ge , Gang Yang , Feng Yi , Junpin Lin
{"title":"Comparison of microstructure and mechanical properties of GH4099 superalloys manufactured by L-DED and L-PBF","authors":"Xinyu Zhang , Yongfeng Liang , Gengwu Ge , Gang Yang , Feng Yi , Junpin Lin","doi":"10.1016/j.matlet.2025.138686","DOIUrl":"10.1016/j.matlet.2025.138686","url":null,"abstract":"<div><div>GH4099 superalloys with typical dendritic/cellular structures were manufactured and studied the microstructure evolution after hot isostatic pressing (HIP) and heat treatment (HT) using laser-powder bed fusion (L-PBF) and laser-directed energy deposition (L-DED), respectively. The results indicate that due to grain size and distribution differences, L-PBF alloy has higher strength and L-DED alloy has better plasticity at room temperature. In contrast, at high temperatures, the strengthening of grain boundaries is weakened, and the strength of the two is similar.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"395 ","pages":"Article 138686"},"PeriodicalIF":2.7,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908022","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}
Materials LettersPub Date : 2025-05-02DOI: 10.1016/j.matlet.2025.138681
Saad H. Ammar , Israa Sh. Mohammed , Huda D. Abdulkader , Zaid H. Jabbar , Duaa J. Kadhim
{"title":"ZIF-67/C-doped TiO2 heterojunctions for prompted photocatalytic decomposition of emerging pollutants","authors":"Saad H. Ammar , Israa Sh. Mohammed , Huda D. Abdulkader , Zaid H. Jabbar , Duaa J. Kadhim","doi":"10.1016/j.matlet.2025.138681","DOIUrl":"10.1016/j.matlet.2025.138681","url":null,"abstract":"<div><div>Herein, we fabricated carbon-doped TiO<sub>2</sub> and Co-based zeolitic imidazolate framework (ZIF-67) separately; then combined them to achieve efficient heterojunctions for visible-light-induced degradation of Malachite Green (MG). Notably, 40 wt%-ZIF-67/C-TiO<sub>2</sub> hybrid endorsed superior photocatalytic activity (96.8 %) under 45 min visible-light irradiation, which compared to bare C-TiO<sub>2</sub> was 6.5-times improvement. The results showed that C-TiO<sub>2</sub> exhibits enhanced visible light harvesting. The developed Z-type heterojunction between ZIF-67 and C-TiO<sub>2</sub> was behind the large separation of photocharge carriers. Furthermore, <sup>•</sup>O<sub>2</sub><sup>−</sup> and <sup>•</sup>OH species act as the key reactive species. The photocatalytic degradation of 93.2 % was still reached at the end of the fifth round, demonstrating high durability of synthesized ZIF-67/C-TiO<sub>2</sub> heterojunction.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"395 ","pages":"Article 138681"},"PeriodicalIF":2.7,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908143","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 effect of low concentrations of selected metal ions (Al, Ag, Cu, Mn) on the properties of ZnO nanoparticles prepared by the co-precipitation technique","authors":"Rabie Amari , Smail Terchi , Djamel Allali , Bahri Deghfel , Abdelhamid Guelil , Ammar Boukhari , Elhadj Benrezgua , Abdelhalim Zoukel , Ahmad Azmin Mohamad","doi":"10.1016/j.matlet.2025.138677","DOIUrl":"10.1016/j.matlet.2025.138677","url":null,"abstract":"<div><div>The effect of metal ion (MI) doping on the properties of zinc oxide nanoparticles (ZnO-NPs), was investigated. ZnO-NPs doped with a small amount (1.7 %) of Al, Ag, Cu, and Mn were successfully synthesized. X-ray diffraction (XRD) confirmed the retention of the hexagonal wurtzite structure after doping, with no secondary phases observed. A clear correlation was established between the ionic radii of the dopants and the consistent changes in the structural, vibrational and morphological properties. Ultraviolet–visible (UV–visible) spectroscopy showed a noticeable widening of the optical bandgap, shifting from 3.70 eV (ZnO) to 3.90 eV (Al-doping), 4.04 eV (Ag- doping), 3.88 eV (Cu- doping), and 3.97 eV (Mn- doping).</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"394 ","pages":"Article 138677"},"PeriodicalIF":2.7,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143901886","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}
Materials LettersPub Date : 2025-05-02DOI: 10.1016/j.matlet.2025.138682
Zhenglei Rui, Shangyu Huang, Huajun Wang
{"title":"Microstructure evolution and mechanical properties of Cu/Al magnetic pulse-assisted semi-solid brazed joints","authors":"Zhenglei Rui, Shangyu Huang, Huajun Wang","doi":"10.1016/j.matlet.2025.138682","DOIUrl":"10.1016/j.matlet.2025.138682","url":null,"abstract":"<div><div>This study uses magnetic pulse-assisted semi-solid brazing (MPASSB) to join Cu/Al tubes. By modulating brazing forming voltage, solid–liquid interfacial interactions are controlled, and their effects on oxide removal, elemental diffusion, and microstructure are analyzed. Results demonstrate that the MPASSB method achieves metallurgically bonded joints without brittle Cu/Al intermetallic compounds (IMCs). Meanwhile, increasing the brazing forming voltage enhances interfacial interactions, promoting the removal of the copper-side (Cu-side) oxide film and accelerating elemental diffusion. Furthermore, by adjusting the brazing forming voltage, high-quality joints with shear strength of up to 70.6 MPa can be achieved.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"395 ","pages":"Article 138682"},"PeriodicalIF":2.7,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908024","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":"Ag-Induced Synergistic Enhancement of mechanical and shape memory characteristics in Cu-Al-Ni alloys","authors":"Jinjin Zhang , Chi Zhang , Mingyong Jia , Guanchao Yin , Fei Chen","doi":"10.1016/j.matlet.2025.138679","DOIUrl":"10.1016/j.matlet.2025.138679","url":null,"abstract":"<div><div>This study investigates the microstructure, mechanical properties, and shape memory behavior of a series of (84-x) Cu-12Al-4Ni-xAg (x = 0, 4, 8, 12 wt%) alloys with varying Ag contents. The alloys predominantly exhibited martensitic phases: 18R and 2H, with the 18R phase becoming more prevalent as Ag was introduced. The formation of the Ag<sub>2</sub>Al phase and microstructural refinement contributed to significant improvements in mechanical properties. Notably, the alloy with 8 wt% Ag (x = 8) exhibited peak compressive strength of 947.1 MPa, the compressive strain of 14.1 %. Additionally, the inclusion of Ag enhanced the shape memory effect of the alloys, with the x = 8 alloy demonstrating a reversible strain of 4.7 % upon heating after an 8 % pre-strain.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"395 ","pages":"Article 138679"},"PeriodicalIF":2.7,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908021","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}
Materials LettersPub Date : 2025-05-01DOI: 10.1016/j.matlet.2025.138680
Xiaoshuai Wang , Zhihao Wang , Yongcheng Yang , Wei Luo , Yongwang Li , Qianfu Pan , Huiqun Liu
{"title":"Exceptional strength-ductility synergy in a RAFM steel via heterogeneous fiber-like δ-ferrite/tempered martensite microstructure","authors":"Xiaoshuai Wang , Zhihao Wang , Yongcheng Yang , Wei Luo , Yongwang Li , Qianfu Pan , Huiqun Liu","doi":"10.1016/j.matlet.2025.138680","DOIUrl":"10.1016/j.matlet.2025.138680","url":null,"abstract":"<div><div>In reduced-activation ferritic-martensitic (RAFM) steels, Cr and Si addition always induced formation of δ-ferrite, a soft phase randomly distributed in tempered martensite matrix. Two types of heterogeneous 12Cr1.45Si steel (as a RAFM steel) samples were prepared in this study, with fiber-like δ-ferrite embedded in harder or softer tempered martensitic matrix, designated as T600 and T750 respectively. Both samples exhibited excellent strength-ductility synergy compared to conventional RAFM steels and some oxide dispersion-strengthened (ODS) steels. T600 achieved a high tensile strength of 1218 MPa with a total elongation of 20.2 %; T750 displayed 902 MPa with a higher elongation of 38.4 %. The synergy arises from a hetero- deformation-induced (HDI) strengthening mechanism. Additionally, fiber-like δ-ferrite aligned along the rolling direction (RD) induces grain boundary delamination, enhancing ductility furtherly.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"395 ","pages":"Article 138680"},"PeriodicalIF":2.7,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908020","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}
Materials LettersPub Date : 2025-05-01DOI: 10.1016/j.matlet.2025.138678
Ambedkar K. Verma, Dev K. Mahato
{"title":"Structural, magnetic and ferroelectric properties of a new multivalent ions based La1.5Ba0.5Co(Mn0.5Ti0.5)O6 perovskite","authors":"Ambedkar K. Verma, Dev K. Mahato","doi":"10.1016/j.matlet.2025.138678","DOIUrl":"10.1016/j.matlet.2025.138678","url":null,"abstract":"<div><div>The La<sub>1.5</sub>Ba<sub>0.5</sub>Co(Mn<sub>0.5</sub>Ti<sub>0.5</sub>)O<sub>6</sub> (0.5LBCMT) ceramics comprising multi-valence ions was synthesized by solid-state reaction route for the first time. X-ray diffraction analysis confirmed the monoclinic phase with space group <span><math><mrow><mi>P</mi><msub><mn>2</mn><mn>1</mn></msub><mo>/</mo><mi>n</mi></mrow></math></span>. Field emission scanning electron micrographs (FE-SEM) showed average grain size of 0.56 <span><math><mrow><mi>μ</mi><mi>m</mi></mrow></math></span>. Raman spectra result was compatible with the structural analysis of the sample. Magnetization hysteresis at 5 K and moderate Curie temperature (125 K) was observed. Polarization-electric field (<em>P-E</em>) hysteresis measurement confirmed the reduced ferroelectric nature. The results demonstrated that 0.5LBCMT sample caused magnetic ordering and a switchable ferroelectric state.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"394 ","pages":"Article 138678"},"PeriodicalIF":2.7,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143899136","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}
Materials LettersPub Date : 2025-05-01DOI: 10.1016/j.matlet.2025.138673
Amish Kumar Jha , Preety D. Swami , Hussain Jeevakhan
{"title":"3D-printed frequency-selective substrates for next-generation patch antennas: plasmonic effects and dielectric optimization via infill and composite layering","authors":"Amish Kumar Jha , Preety D. Swami , Hussain Jeevakhan","doi":"10.1016/j.matlet.2025.138673","DOIUrl":"10.1016/j.matlet.2025.138673","url":null,"abstract":"<div><div>This paper presents an innovative approach to designing 3D-printed frequency-selective substrates, tailored for next-generation patch antennas used in 5G, IoT, and satellite communication systems. Leveraging additive manufacturing, dielectric properties were precisely tuned through variable infill (70–100 %) and composite layering of ABS Pro + and PLA Pro + materials. Notably, the ABSL80 substrate exhibited plasmonic behavior with a 105.43 % reduction in effective permittivity, a phenomenon not previously reported in thermoplastic substrates. The PLA50ABS50 composite structure demonstrated a 99.29 % reduction in permittivity and enhanced electromagnetic compatibility in multilayer configurations. X-ray photoelectron spectroscopy (XPS) revealed dominant carbon–oxygen peaks in PLA50ABS50 and intensified C–C bonding in ABSL80, confirming distinct interfacial chemistries driving dielectric behavior. Dielectric constants and loss tangents were validated using the Nicholson-Ross-Weir method and modeled through Maxwell Garnett theory. This pioneering work offers a sustainable and customizable platform for compact antenna design, enabling material-driven advancements in wireless communication.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"395 ","pages":"Article 138673"},"PeriodicalIF":2.7,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908025","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}