Powder Metallurgy and Metal Ceramics最新文献

{"title":"Application of the Press-and-Sinter Method to Titanium Powder Produced by a Novel Titanium Dioxide Reduction Technology","authors":"V. S. Kruzhanov,&nbsp;A. G. Gonchar,&nbsp;V. V. Troshchylo,&nbsp;A. V. Brodskyy,&nbsp;V. Y. Yarovynskyi,&nbsp;O. I. Chukhmanov,&nbsp;A. V. Yarovinskyi","doi":"10.1007/s11106-026-00557-w","DOIUrl":"10.1007/s11106-026-00557-w","url":null,"abstract":"<p>The Ukrainian VELTA company has developed and patented a novel technology for producing titanium metal powder through a two-stage reduction of titanium dioxide, offering an alternative to currently widespread titanium powder production methods. The key feature of the technology is the use of titanium oxide as the feedstock material, in contrast to the conventional Kroll process, which relies on titanium tetrachloride. Titanium dioxide powder is formed into feedstock elements with a specific shape, structure, and strength. The oxide constituting these elements is reduced in two stages. The first stage consists of reduction using metallic magnesium vapor and the second stage involves final deoxidation using calcium vapor. In addition to the production of pure metallic titanium, the proposed process can be employed to obtain titanium alloy powders by reducing titanium dioxide together with oxides of doping elements. The resulting powder is characterized by a low content of interstitial oxygen, nitrogen, and carbon atoms, at levels not exceeding the standard values for Ti Grade 1. The typical powder used in this study exhibits a broad particle-size distribution with a D50 of approximately 50 μm and consists of compact, irregularly shaped particles along with a significant number of very fine, nearly spherical particles smaller than 2 μm. Classification of the powder into two fractions employing an inexpensive sieving technique makes it suitable for various powder metallurgy applications. When separated into fractions below and above 45 μm, the fine fraction accounts for approximately one-third and the coarse fraction for two-thirds of the original powder weight. Previous studies have shown that the fine fraction (&lt;45 μm) is suitable for metal injection molding (MIM). The aim of this study is to determine the suitability of VELTA’s &gt;45 μm powder fraction for producing compact titanium via the press-and-sinter method.</p>","PeriodicalId":742,"journal":{"name":"Powder Metallurgy and Metal Ceramics","volume":"64 11-12","pages":"664 - 673"},"PeriodicalIF":0.8,"publicationDate":"2026-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965411","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":"A Novel Eu2+-Doped θ-Al2O3 Cyan-Emitting Phosphor for Bridging the Cyan Gap in High-Performance White Light-Emitting Diodes","authors":"Yingnan Dong,&nbsp;Zhongxiang Shi,&nbsp;Jing Wang,&nbsp;Xu Sun,&nbsp;Chuheng Guan","doi":"10.1007/s11106-026-00563-y","DOIUrl":"10.1007/s11106-026-00563-y","url":null,"abstract":"<p>To address the \"cyan gap\" issue in white light-emitting diodes (WLEDs), a novel Eu²⁺-doped θ-Al₂O₃ cyan-emitting phosphor (θ-Al_2(1–x)O₃ : xEu²⁺ (0.06 ≤ x ≤ 0.22)) was synthesized via the high-temperature solid-state reaction. The results indicate that all samples exhibit a pure monoclinic phase structure, with Eu2+ doping causing no phase transformation in the host lattice. The phosphor particles display uniform morphology and an average particle size of approximately 0.39 μm. Photoluminescence analysis reveals that the material exhibits strong absorption in the 300–420 nm range, enabling effective excitation by near-ultraviolet LED chips. The dominant emission peak is located at 500 nm, which precisely covers the cyan spectral gap. Gaussian fitting further deconvolutes the emission into two sub-peaks at 468 nm and 510 nm, attributed to Eu²⁺ occupying the Al(2) octahedral sites and Al(1) tetrahedral sites, respectively. Thermal stability tests demonstrate that the phosphor retains 81.78% of its initial emission intensity at 150°C and 65.26% at 250°C. The thermal-quenching activation energy was calculated to be 0.223 eV, indicating excellent thermal-quenching resistance. For practical application, an optimized sample (θ-Al_1.64O₃ : 0.18Eu²⁺) was combined with a commercial white phosphor to fabricate a prototype WLED device. Electroluminescence spectra of the device show a significant enhancement in the cyan emission region (480–520 nm), and the color rendering index (Ra) exceeds 78. These results confirm that the developed phosphor effectively improves the spectral continuity and color rendering performance of WLEDs.</p>","PeriodicalId":742,"journal":{"name":"Powder Metallurgy and Metal Ceramics","volume":"64 11-12","pages":"751 - 761"},"PeriodicalIF":0.8,"publicationDate":"2026-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965410","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":"Temperature and Composition Ranges of fcc HEA Existence in the Cu–Cr–Fe–Co–Ni System II. Calculation Results and Experimental Verification","authors":"M. A. Turchanin,&nbsp;P. G. Agraval,&nbsp;A. O. Vodopyanova,&nbsp;M. V. Bulanova,&nbsp;I. V. Fartushna,&nbsp;V. F. Kravchuk","doi":"10.1007/s11106-026-00561-0","DOIUrl":"10.1007/s11106-026-00561-0","url":null,"abstract":"<p>Within the framework of the CALPHAD method, vertical radial sections were calculated using the database developed by, reflecting phase transformations involving the liquid (L), fcc (A1), and bcc (A2) phases of the Cu–Cr–Fe–Co–Ni system over the range from liquidus temperatures to 1000 K. The calculations show that the equiatomic alloy and alloys with near-equiatomic compositions are two-phase, formed by the fcc₁ phase depleted in copper and the fcc₂ phase enriched in copper. In these alloys, a precipitation-strengthened fcc structure can be produced, with the primary grains formed by the fcc₁ phase and with the strengthening dispersed particles formed by the fcc₂ phase. The composition of these alloys corresponds to the stabilization condition due to the high-entropy effect. The experimentally determined phase composition, chemical composition of the phases, microstructure of the as-cast and annealed alloys, and phase transition temperatures in the as-cast alloys are in full agreement with the sections of the Cu–Cr–Fe–Co–Ni phase diagram modeled within the CALPHAD method. The lattice parameters of the fcc phase are governed by the combined influence of the copper-to-chromium and iron-to-cobalt ratios. The (<i>x</i>_Cu/<i>x</i>_Cr)·(<i>x</i>_Fe/<i>x</i>_Co) factor is proposed to unite them and allows to describe the lattice parameters by a single dependence. The microhardness of the matrix fcc phase in the as-cast and annealed alloys indicates that the matrix of these high-entropy alloys is quite soft and requires strengthening, whose possibility is supported by the present calculations. The thermodynamic database used for the calculations opens the way to a targeted selection of the optimal composition of precipitation-strengthened high-entropy alloys in the Cu–Cr–Fe–Co–Ni system and to determination of technological conditions for their production.</p>","PeriodicalId":742,"journal":{"name":"Powder Metallurgy and Metal Ceramics","volume":"64 11-12","pages":"728 - 741"},"PeriodicalIF":0.8,"publicationDate":"2026-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965398","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":"Interfacial Microstructure and Properties of Al/(7075–B4C)/Al Laminated Composite Slabs Fabricated Via Semi-Continuous Casting and Hot Rolling","authors":"Yingshui Yu,&nbsp;Mingze Du,&nbsp;Liping Feng,&nbsp;Kunpeng Yao,&nbsp;Heng Ju,&nbsp;Zhongai Jiang","doi":"10.1007/s11106-026-00565-w","DOIUrl":"10.1007/s11106-026-00565-w","url":null,"abstract":"<p>Laminated composites, consisting of multiple materials with distinct properties arranged in layers, are designed to combine attributes like high strength, low density, and excellent fracture toughness. These materials can be tailored to specific requirements by adjusting the number and composition of layers. Inspired by biomimetic designs, such as nacre, the development of graphene oxide-polydopamine (GO-PDA) nanocomposites has improved material properties. Fabrication methods for these composites, particularly in metal/metal and metal/ceramic combinations, include diffusion bonding, roll bonding, and casting. However, challenges such as high production costs and complex preparation processes hinder the development of metal/ceramic laminated composites. This study focuses on a metal-ceramic composite matrix reinforced with boron carbide (B₄C) in aluminum alloys and investigates semi-continuous casting methods for fabricating Al/(7075–B₄C)/Al laminated composites. The composites exhibit excellent mechanical properties, including high hardness, good impact energy absorption, and resistance to projectile impact.</p>","PeriodicalId":742,"journal":{"name":"Powder Metallurgy and Metal Ceramics","volume":"64 11-12","pages":"773 - 782"},"PeriodicalIF":0.8,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965493","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":"Multicomponent Alloys of the ZrNiMnCr(V) System for Chemical Current Sources II. Influence of Temperature, Discharge Rate, and Other Parameters on the Electrochemical Hydrogen Sorption Properties of Alloys","authors":"Yu. M. Solonin,&nbsp;O. Z. Galiy,&nbsp;K. O. Graivoronska","doi":"10.1007/s11106-026-00562-z","DOIUrl":"10.1007/s11106-026-00562-z","url":null,"abstract":"&lt;p&gt;The electrochemical hydrogen sorption properties of electrodes produced from alloys without vanadium, ZrNi&lt;sub&gt;1.2&lt;/sub&gt;Mn&lt;sub&gt;0.5&lt;/sub&gt;Cr&lt;sub&gt;0.3&lt;/sub&gt; (1), and with different vanadium contents, ZrNi&lt;sub&gt;1.2&lt;/sub&gt;Mn&lt;sub&gt;0.5&lt;/sub&gt;Cr&lt;sub&gt;0.2&lt;/sub&gt;V&lt;sub&gt;0.1&lt;/sub&gt; (2), ZrNi&lt;sub&gt;1.2&lt;/sub&gt;Mn&lt;sub&gt;0.45&lt;/sub&gt;Cr&lt;sub&gt;0.2&lt;/sub&gt;V&lt;sub&gt;0.15&lt;/sub&gt; (3), ZrNi&lt;sub&gt;1.2&lt;/sub&gt;Mn&lt;sub&gt;0.4&lt;/sub&gt;Cr&lt;sub&gt;0.2&lt;/sub&gt;V&lt;sub&gt;0.2&lt;/sub&gt; (4), and ZrNiMn&lt;sub&gt;0.5&lt;/sub&gt;Cr&lt;sub&gt;0.2&lt;/sub&gt;V&lt;sub&gt;0.5&lt;/sub&gt; (5), without catalytic additives were studied in galvanostatic and potentiodynamic modes. The effect of temperature and discharge rate on the hydrogen sorption behavior of alloys with different contents of the Zr&lt;sub&gt;7&lt;/sub&gt;Ni&lt;sub&gt;10&lt;/sub&gt; phase was examined. This phase had a decisive influence on the kinetics of electrode processes for ZrNiMnCr(V) alloys, and its content decreased from ~28 vol.% (alloy 1) to zero (alloy 5) with increasing vanadium content. Galvanostatic studies were conducted on electrodes produced from alloys 2 and 4 containing 17 and 3.5 vol.% Zr&lt;sub&gt;7&lt;/sub&gt;Ni&lt;sub&gt;10&lt;/sub&gt; phase at 20, 25, and 30°C. The dependence of the maximum discharge capacity on temperature and discharge current increased with decreasing amount of the Zr&lt;sub&gt;7&lt;/sub&gt;Ni&lt;sub&gt;10&lt;/sub&gt; phase. A decrease in the temperature from 25 to 20°C at discharge current &lt;i&gt;I&lt;/i&gt;&lt;sub&gt;d&lt;/sub&gt; = 50 mA/g had a more negative effect on the hydrogen sorption properties of the electrode with a smaller amount of the Zr&lt;sub&gt;7&lt;/sub&gt;Ni&lt;sub&gt;10&lt;/sub&gt; phase (3.5 vol.%). At &lt;i&gt;I&lt;/i&gt;&lt;sub&gt;d&lt;/sub&gt; = 30 mA/g, this effect was not observed. An increase in the temperature from 25 to 30°C significantly improved the hydrogen sorption properties of the electrode with a higher amount of the Zr&lt;sub&gt;7&lt;/sub&gt;Ni&lt;sub&gt;10&lt;/sub&gt; phase (activation occurred in two cycles) and had a lower effect in the case of the electrode from alloy 4. The recovery of the discharge capacity of the electrodes after a 7-day interruption of cycling depended on the amount of the Zr&lt;sub&gt;7&lt;/sub&gt;Ni&lt;sub&gt;10&lt;/sub&gt; phase: the discharge capacity decreased at 17 vol.% Zr&lt;sub&gt;7&lt;/sub&gt;Ni&lt;sub&gt;10&lt;/sub&gt; and increased at 3.5 vol.%. The highest cyclic stability was demonstrated by the electrodes from the alloys with ~3.7–5 wt.% V. A discrepancy was found between the electrode surface activity evaluated by potentiodynamic studies and the activation rate determined by galvanostatic measurements. A comprehensive analysis of the surface activity, phase composition (C15 + C14 and Zr&lt;sub&gt;7&lt;/sub&gt;Ni&lt;sub&gt;10&lt;/sub&gt;) of the alloys, and activation rate of the associated electrodes showed that the surface activity was primarily governed by the main C15 + C14 phases and the Zr&lt;sub&gt;7&lt;/sub&gt;Ni&lt;sub&gt;10&lt;/sub&gt; phase, but the propagation of the reaction into the inner alloy layers was largely promoted by the Zr&lt;sub&gt;7&lt;/sub&gt;Ni&lt;sub&gt;10&lt;/sub&gt; phase. Thus, the relationship between the quantitative phase composition of the ZrNiMnCr(V) alloys and the vanadium content was established, the role of the Zr&lt;sub&gt;7&lt;/sub&gt;N","PeriodicalId":742,"journal":{"name":"Powder Metallurgy and Metal Ceramics","volume":"64 11-12","pages":"742 - 750"},"PeriodicalIF":0.8,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965440","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":"Friction and Wear Characteristics of the GF/BN/EP Composite during Sliding","authors":"Sang Xiong,&nbsp;Ruxue Shen,&nbsp;Chao Wu,&nbsp;Huaguan Li","doi":"10.1007/s11106-026-00559-8","DOIUrl":"10.1007/s11106-026-00559-8","url":null,"abstract":"<p>Epoxy resin (EP) was used as the matrix, with glass fiber (GF) and boron nitride (BN) as reinforcements to prepare GF/BN/EP composites for industrial components under complex service conditions. GF/BN/EP composites with BN contents of 0, 0.3, 0.6, 0.9, and 1.2 wt.% were fabricated via vacuum diversion technique, and their tribological behaviors were systematically investigated under dry sliding, oil-lubricated sliding, and argon atmosphere sliding conditions. The results show that the argon atmosphere yields the highest coefficient of friction and wear rate for the composites, due to continuous contact between fresh GF fibers and the steel counterpart, which fails to form an effective adsorbed surface layer. Under all test conditions, the wear rate and friction coefficient of the composites decrease significantly with increasing BN content from 0 to 1.2 wt.%, which is attributed to the excellent solid lubrication and anti-wear properties of BN nanoparticles. In addition, increasing the normal load (40 ~ 120 N) and the sliding speed (2.5 ~ 10 m/s) elevates the tribocontact zone temperature, resulting in thermal softening of the EP matrix and accelerated fiber-matrix debonding, thereby increasing the wear loss of the composites. The worn surface morphology and steel counterpart characterization reveal the wear mechanisms of the composites under different conditions, and the formation of a transfer film on the steel surface in an oil-lubricated environment is the key factor in the lowest tribological loss. This work clarifies the coupling effects of BN content, test parameters, and the sliding medium on the tribological behavior of GF/BN/EP composites. It provides a theoretical basis for the design and industrial application of high-performance polymer-matrix tribological composites.</p>","PeriodicalId":742,"journal":{"name":"Powder Metallurgy and Metal Ceramics","volume":"64 11-12","pages":"700 - 711"},"PeriodicalIF":0.8,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965441","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":"Influence of Chemical Vapor Deposition Conditions on the Morphology of TiC Micro- and Nanostructures","authors":"P. M. Sylenko,&nbsp;D. I. Andrushchenko,&nbsp;I. Yu. Okun,&nbsp;Yu. M. Solonin","doi":"10.1007/s11106-026-00556-x","DOIUrl":"10.1007/s11106-026-00556-x","url":null,"abstract":"<p>The synthesis of TiC micro- and nanofibers by chemical vapor deposition from titanium tetrachloride and carbon-containing substances such as toluene and carbon tetrachloride, using Fe, Co, Ni, and Al catalysts, in the temperature range 1000–1200°C was studied. The optimal temperature ranges for the synthesis of TiC micro- and nanofibers were found to be 1000–1100°C with titanium tetrachloride and toluene as the carbon source and 1150–1200°C with titanium tetrachloride and carbon tetrachloride, which is consistent with the thermodynamic calculations. Nickel was identified as the most suitable catalyst for the synthesis. The TiC micro- and nanofibers grew through the vapor–liquid–solid mechanism. The TiC nanofibers were predominantly synthesized at 1000–1100°C, while microfibers with diameters reaching several micrometers were produced at higher temperatures. When nickel was used as the catalyst, the fibers grew in the form of tufts or needles. Thickened regions, microcrystals, and nanofibers developed on individual TiC microfibers. For the first time, rod-like phases were produced by chemical vapor deposition on an aluminum substrate, which can be interpreted as the MAX Ti₃AlC₂ phase. When iron powder was used as the catalyst, a two-dimensional titanium carbide phase grew, regardless of the carbon source. Dew-like droplets were formed on titanium carbide fibers grown on nickel or cobalt catalysts. Their composition can be attributed to the corresponding eutectics in the Ti–Ni and Ti–Co systems.</p>","PeriodicalId":742,"journal":{"name":"Powder Metallurgy and Metal Ceramics","volume":"64 11-12","pages":"655 - 663"},"PeriodicalIF":0.8,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965443","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":"Phase Equilibria in the 40–60% (at.) Ni Region of the Ni–Sc–Zr System. Quasibinary ZrNi–ScNi Section","authors":"O. L. Semenova,&nbsp;O. S. Fomichev,&nbsp;K. A. Meleshevich,&nbsp;A. V. Sameliuk,&nbsp;V. V. Kremenytskyi,&nbsp;A. I. Agapov","doi":"10.1007/s11106-026-00560-1","DOIUrl":"10.1007/s11106-026-00560-1","url":null,"abstract":"<p>To refine the phase transformations near the 50 at.% Ni isopleth in the ternary Ni–Sc–Zr system and, using the data obtained, to clarify the nature of the section between the equiatomic phases of the Ni–Zr and Ni–Sc systems, phase equilibria and crystallization reactions of alloys in the 40–60 at.% region were studied with physicochemical analysis methods (metallography, X-ray diffraction, differential thermal analysis, and electron probe microanalysis). The equiatomic phases based on ZrNi (Cmcm space group, CrB-type structure) with a melting temperature of 1230°C and Sc₅₃Ni₄₇ (Pm3m group, CsCl structure) with a melting temperature of 1270°C were ascertained to form a quasibinary section with a gentle maximum on the solidus and liquidus curves at 1300°C in the 15–20 at.% Sc composition range. At subsolidus temperatures, the Sc₅₃Ni₄₇-based phase dissolves up to 40 at.% Zr, and the ZrNi-based phase dissolves less than 5 at.% Sc. The transition between modifications may occur both by a diffusionless mechanism in the solid state and with the participation of a liquid phase. The reported data do not contradict either version. As in the binary boundary systems, the homogeneity regions of the equiatomic phases are linear and do not dissolve components at subsolidus temperatures, but their primary crystallization fields are extensive, ranging from 30 to 60 at.% Ni. The phase with an orthorhombic structure participates in two invariant equilibria involving a liquid phase on the solidus surface, and the cubic phase participates in one equilibrium. The absence of a noticeable ZrNi homogeneity region in the binary system, the rapid (martensitic) transformation, and the narrow temperature range of the probable high-temperature phase do not allow experimental confirmation of its existence. The likelihood of solid-state transformation should be verified by calculation.</p>","PeriodicalId":742,"journal":{"name":"Powder Metallurgy and Metal Ceramics","volume":"64 11-12","pages":"712 - 727"},"PeriodicalIF":0.8,"publicationDate":"2026-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965442","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":"Fabrication and Performance Assessment of Bonding Jumpers for Aircraft Applications","authors":"Burak Güler,&nbsp;Veysel Erturun,&nbsp;Faruk Koca","doi":"10.1007/s11106-026-00564-x","DOIUrl":"10.1007/s11106-026-00564-x","url":null,"abstract":"<p>Bonding jumpers are critical aircraft components that ensure electrical continuity between structural elements and protect against lightning-induced failures, and they must comply with the EN-4199 aviation standard. Despite their safety-critical role, the design, fabrication, and performance evaluation of bonding jumpers, particularly domestic manufacturing, have not been systematically investigated in the literature. In this study, tin-coated copper wires were braided to fabricate bonding jumper specimens and benchmarked against imported bonding jumpers used in passenger aircraft. All specimens were characterized by FESEM–EDX analysis, tensile testing, and electrical resistance measurements. Domestically manufactured bonding jumpers exhibited tin coating ratios, tensile strengths, and electrical resistance comparable to those of imported specimens. In addition, catalog data from leading international manufacturers were evaluated, revealing that the manufactured specimens achieved equivalent or superior performance in both mechanical and electrical properties. These findings represent the first systematic study in the literature to comprehensively investigate the design, fabrication, and multi-parameter performance characterization of bonding jumpers, thereby establishing a scientific foundation for future research and qualification studies in this field.</p>","PeriodicalId":742,"journal":{"name":"Powder Metallurgy and Metal Ceramics","volume":"64 11-12","pages":"762 - 772"},"PeriodicalIF":0.8,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965356","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":"Comprehensive Analysis of Novel SPS Ti6321 and Ti–Nb–Zr–Mo–Al Alloys: Predicting Deformation Mechanisms, Antibacterial Performance and Processing Map for Orthopedic Implants","authors":"B. Vinod,&nbsp;N. Santhosh,&nbsp;Muralasetti Nookaraju,&nbsp;B. Divya Baliga,&nbsp;Vinayak B. Hemadri","doi":"10.1007/s11106-026-00558-9","DOIUrl":"10.1007/s11106-026-00558-9","url":null,"abstract":"<p>The high-temperature flow behavior and thermomechanical processing conditions are fundamental requirements for evaluating Ti alloys in the current context of lightweight, high-strength structural materials. Considerable work has been carried out on the correlation between heat treatments, microstructure, and properties of the Ti₅₂Nb₁₉Zr₁₅Mo₁₄ and Ti6321 alloys. Workability was evaluated under various heat-treatment conditions that allow α to precipitate. However, processing maps determine stability and instability regimes that impact deformation behavior at elevated temperatures. However, the impact of workability on Ti6321 and Ti–Nb–Zr–Mo alloys has not been explored. A high-temperature hot deformation test at 700 to 1000°C and a strain rate range of 0.01 to 10 s^–1, with a constant strain of 0.3, was employed to characterize the hot flow behavior of Ti alloys. The processing map showed a high peak power dissipation efficiency (η = 56%) at 910°C and a strain rate of 10 s^–1 for the Ti₅₂Nb₁₉Zr₁₅Mo₁₄ alloy. Two distinct mechanisms, continuous dynamic recrystallization (DRX) characterized by the progressive rotation of sub-grains and dynamic recovery (DRY), which includes the original grain boundary, are identified. At low temperatures and high strain rates, it was discovered that dynamic recovery was the primary deformation process. The Ti–Nb–Zr–Mo exhibits high tensile strength and hardness of 912 and 396 MPa compared to the Ti6321 alloy. The research further examined the applicability and reliability of the hot-processing map for titanium alloys. This type of material is widely used in gas turbine engine components, submarine hydraulic fittings, and surgical tools that require high-temperature resistance.</p>","PeriodicalId":742,"journal":{"name":"Powder Metallurgy and Metal Ceramics","volume":"64 11-12","pages":"674 - 699"},"PeriodicalIF":0.8,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148965357","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}