International Journal of Lightweight Materials and Manufacture最新文献

{"title":"Minimizing residual stress and fatigue crack propagation rate of FSW joints of AA2024-T3 by transient thermal tensioning: Effect of heater distance","authors":"Pujono ,&nbsp;M.N. Ilman ,&nbsp;M.R. Muslih ,&nbsp;Kusmono","doi":"10.1016/j.ijlmm.2024.03.006","DOIUrl":"10.1016/j.ijlmm.2024.03.006","url":null,"abstract":"<div><p>Friction stir welding (FSW) is a solid-state welding process that is suitable for joining hardly weldable metals such as aircraft AA2024-T3 aluminum alloy. Despite FSW owns many advantages, however, some problems still arise, especially welding residual stress which influences the weld fatigue performance. In the present work, in-process transient thermal tensioning (TTT) treatment was applied to the FSW process of AA2024-T3 aluminum alloy by putting two symmetrical heaters at the sides of the weld line at distances of 25 mm, 40 mm, and 55 mm. The FSW was conducted at the tool rotational speed of 1500 rpm and tool traveling speed of 30 mm/min whereas the heating temperature was set at 200 °C. Subsequently, changes in microstructure, strength, hardness, residual stress, and fatigue crack propagation rate under TTT treatment were evaluated. The results showed that the use of TTT generated peaks of tensile residual stress along the heater passage which changed the residual stress distributions. It was found that the best fatigue crack propagation resistance of the weld occurred at the heater distance of 25 mm which was attributable to the compressive residual stresses present in the weld region induced by thermal tensioning combined with re-precipitation during welding.</p></div>","PeriodicalId":52306,"journal":{"name":"International Journal of Lightweight Materials and Manufacture","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2588840424000271/pdfft?md5=ef5f82f2b7c8aa21f9694b8d82b7deba&pid=1-s2.0-S2588840424000271-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140406287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Novel short Agave americana based biocomposite and nanobiocomposites for automotive applications","authors":"Chinnappa Arumugam ,&nbsp;Gandarvakottai Senthilkumar Arumugam ,&nbsp;Ashok Ganesan ,&nbsp;Ponnurengam Malliappan Sivakumar ,&nbsp;Kannan Damodharan ,&nbsp;Mukesh Doble ,&nbsp;Sarojadevi Muthusamy","doi":"10.1016/j.ijlmm.2024.03.003","DOIUrl":"10.1016/j.ijlmm.2024.03.003","url":null,"abstract":"<div><p>Short fibers of <em>Agave Americana</em> (AA) was extracted from its plant leaf, was chemically treated with Ac₂O, HCOOH, H₂O₂, KMnO₄ and NaOH, and then characterized by Attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), thermo-gravimetric/differential thermo-gravimetric (TGA/DTG), and field emission-scanning electron microscopy (FE-SEM). PVA stabilized copper nanoparticles from chemical reduction method was characterized using field emission-scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDAX), powder X-ray diffraction (PXRD), Dynamic light scattering analysis (DLS), UV–visible absorption spectroscopy, Fourier Transform infrared (FT-IR) spectroscopy and Thermogravimetric analysis/differential thermogravimetry (TGA/DTG). Bio-composites (AA + Polyester Resin (PE) and hybrid nano bio-composites (AA + Polyester Resin (PE) + Cu) were prepared from the untreated and treated AA fibers and further characterized. The synergistic effect of chemical treatment on morphological (SEM), thermal (TGA/DTG), mechanical properties (flexural, tensile, impact and compressive strength) followed by % water absorption were examined. The average surface roughness values (Ra) of chemical treated fiber was identified to be in decreasing manner along with compression strength of biocomposite in the order of untreated (10.74 μm, 44.01 MPa) &gt; NaOH (8.55 μm, 45.07 MPa) &gt; HCOOH (3.49 μm, 24.10 MPa) Ac₂O (3.24 μm, 22.10 MPa) &gt; H₂O₂ (2.51um, 17.9 MPa) &gt; KMnO₄ (1.52 μm, 15.1 MPa) treated fibers. Subsequently, the addition of 2s@PVA led to reverse the order namely, the compressive strength of the bionanocomposites were Untreated (10.74 μm, 9.0 MPa) &lt; NaOH (8.55 μm, 0.1 MPa) &lt; HCOOH (3.49 μm, 3.6 MPa) &lt; Ac₂O (3.24 μm, 7.6 MPa) &lt; H₂O₂ (2.51um, 13.3 MPa) &lt; KMnO₄ (1.52 μm, 44.1 MPa) treated fibers. Similarly, the biocomposite where the fibres were treated with NaOH, HCOOH were more rough and had, good interconnection between fiber/PE matrix along with enhanced mechanical properties. On addition of nanobiocomposite, only KMnO₄ treated fiber composite possed significant mechanical properties. Therefore, mixing CuNPs@PVA with KMnO₄ treated fibers led to significant boost to the mechanical properties and minimised the % water absorption properties when compared to the untreated AA/PE biocomposites. The KMnO₄ treatment of the AA fiber and addition of copper nanoparticles caused the enhancement of thermal properties, tensile strength and flexural strength. But, these nanobiocomposites were observed to have low impact strength; while, H₂O₂ treated nanobiocomposites had highest impact strength. The chemical treatment of the AA fiber with NaOH, Ac₂O and KMnO₄ developed the water resistance of th","PeriodicalId":52306,"journal":{"name":"International Journal of Lightweight Materials and Manufacture","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2588840424000246/pdfft?md5=2b3231337f3a2ed130c6fcf3db63b926&pid=1-s2.0-S2588840424000246-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140401942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental and numerical investigation on cold cracking susceptibility of naval grade high strength steel welds for lightweight shipbuilding structures","authors":"Mikhail Ivanov ,&nbsp;Аlexander Cherniavsky ,&nbsp;Аleksandr Tingaev ,&nbsp;Yury Bezgans ,&nbsp;Denis Derbenev ,&nbsp;Nataliya Shaburova ,&nbsp;Ilsiya Suleymanova ,&nbsp;Anmar Alrukhaymi ,&nbsp;Tushar Sonar","doi":"10.1016/j.ijlmm.2024.03.004","DOIUrl":"https://doi.org/10.1016/j.ijlmm.2024.03.004","url":null,"abstract":"<div><p>In this study the cold cracking (CC) susceptibility of naval grade high strength steel (HSS) welds developed using flux core wires of different yield strength levels was analyzed for lightweight shipbuilding structures. The steel plates of the PCE500 TM grade were welded in T-joint configuration using automatic flux core arc welding under the shielding gas. The CC susceptibility of weld metals was evaluated using Tekken weldability test. The microstructure of weld metal and the hardness of welded joint were analyzed using optical microscope and Vickers microhardness tester, respectively. Software package Sysweld was used for finite element simulation of CC susceptibility of weld metals. Results showed that the probability of CC increases with increase in the strength of filler wires, especially under conditions of limited welding deformations and exposure to low temperatures. The maximum resistance to the formation of cold cracks (CCs) in microstructure of the weld metal is observed in the presence acicular ferrite of at least 60%. To assess the structural strength of T-joint with soft welds, a calculation method has been developed, which allows ranking various structural and technological solutions of the T-joint from the condition of resistance to various types of fracture. Numerical calculation showed that the margin for brittle fracture at 11–23% and the gain in fatigue durability at 40% for welded joint with soft weld greater than for a welded joint with an equally strong weld. The use of low strength filler wires for welding thick plates of HSSs can successfully resolve the problem of CCs and ensure structural strength of joints.</p></div>","PeriodicalId":52306,"journal":{"name":"International Journal of Lightweight Materials and Manufacture","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2588840424000258/pdfft?md5=3a15ec497447aacbdf49135455a9c529&pid=1-s2.0-S2588840424000258-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140643977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanical properties of LDPE and PS polymer matrix composites reinforced with GNP and CF — A critical review","authors":"Bilal Gayretli ,&nbsp;Rajinth Shanthar ,&nbsp;Tahsin Tecelli Öpöz ,&nbsp;Chamil Abeykoon","doi":"10.1016/j.ijlmm.2024.03.005","DOIUrl":"https://doi.org/10.1016/j.ijlmm.2024.03.005","url":null,"abstract":"<div><p>There is always a vital need for more robust, affordable, and multifunctional materials to satisfy the demands of industrial consumers. Therefore, polymer matrix composites (dual and hybrid matrix) have become popular with multiple fillers to meet these needs. Graphene nano-platelet (GNP) and Carbon fibre (CF) are popular among those fillers due to their superior properties, such as good mechanical, thermal, and electrical properties. Low density polyethylene (LDPE), Polystyrene (PS), GNP, and CF are popular and heavily used in the packaging, automotive, and aerospace industries. However, it would be good to look at how these areas have evolved over the last few decades. Hence, this review focuses on a comparison of LDPE and PS as a matrix and GNP and CF as a filler, considering the content that determines the overall performance of blends and composites. The literature was screened for the last few decades. The blends and/or composites produced by a twin-screw extruder were included. A total of 1628 relevant papers were retrieved from all databases. Based on the review, it was deduced that more research should be needed in areas such as the aerospace industry to identify optimum content. Most of the analysis showed that factors such as filler surface area, dispersion, and content affect overall blends and composites' performance in terms of mechanical properties, especially elastic modulus and tensile strength, and other properties. Based on the review, it was realised that using 20 and 30 wt%, 2 and 30 wt%, 2 and 4 wt%, and 20 and 30 wt% filler was the most common combination giving the optimum content for LDPE, PS, GNP, and CF, respectively. EMS and TSH changes of the composites were calculated according to their optimum content. Overall, LDPE and PS are good in packaging areas, but their mechanical properties still need to be improved for use in industries such as automotive, aerospace etc. Due to the advantages of GNP and CF, they are used in different applications, such as electrical devices, medical tools, and automobile vehicles. However, these properties are affected easily by interfacial adhesion, dispersion, and aggregation. Many researchers have searched these parameters and analysed how to prevent the negative effects of these parameters. In conclusion, this review will be helpful for researchers and industrial people to be aware of the state-of-the-art of carbon-based composites and the evolution of LDPE, PS, GNP, and CF.</p></div>","PeriodicalId":52306,"journal":{"name":"International Journal of Lightweight Materials and Manufacture","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S258884042400026X/pdfft?md5=d47bbcca45f4222ca945685c0f60ee7c&pid=1-s2.0-S258884042400026X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140643976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Novel methods for optimizing CNC aluminum alloy machining parameters in polymer mold cavities","authors":"Ibrahim I. Ikhries ,&nbsp;Ali F. Al-Shawabkeh","doi":"10.1016/j.ijlmm.2024.03.002","DOIUrl":"10.1016/j.ijlmm.2024.03.002","url":null,"abstract":"<div><p>The examination of the machining of 7075-T6 aluminum alloy polymer mold cavities using Taguchi optimization and analysis of variance is presented in this paper. This study identified the best CNC milling cutting parameters and used a mathematical model to quantify the surface roughness of the machined cavities. The findings showed that while using a flat endmill, the spindle speed multiplied by feed rate contributed 28.01% to surface roughness, and when using a ball endmill, the squared depth of cut contributed 41.27%. Using both flat and ball endmills, the depth of the cut contributed 98.53% to the material removal rate. A refined second-order linear regression model was employed to forecast the endmill-machined surface roughness. The Warp Surf Portable tester measured values that were outside the error range of approximately 0.257% and 2.8%, respectively, for the expected values. Surface roughness has a 99.97% correlation coefficient in the regression model, indicating a very significant link. Additionally, the study improved the cutting parameters for a ball endmill, which were 3005 Rpm, 726.7 mm/min, and 0.43 mm, and for a flat endmill, these were spindle speed (2500 Rpm), feed rate (650 mm/min), and axial cut depth (0.5 mm). The outcomes demonstrated how well the techniques enhanced mold cavity machining and cost estimation using Ra and MRR data. Consequently, these results can be applied to future academic studies and industrial applications.</p></div>","PeriodicalId":52306,"journal":{"name":"International Journal of Lightweight Materials and Manufacture","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2588840424000234/pdfft?md5=d6ba6c344da6f1a481934a52e7402042&pid=1-s2.0-S2588840424000234-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140270955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Laser ultrasonic inspection of internal porosity defects in AlSi10Mg additive manufacturing components","authors":"Huan Xi ,&nbsp;Xiao Wang ,&nbsp;Zheng Wang ,&nbsp;Yuanyi Zhang","doi":"10.1016/j.ijlmm.2024.03.001","DOIUrl":"10.1016/j.ijlmm.2024.03.001","url":null,"abstract":"<div><p>Additive Manufacturing (AM) technology is recognized as a pivotal direction for future technological and industrial advancement. Nevertheless, inherent to the manufacturing process are defects such as pores, inclusions, lack of fusion, and layering, which pose significant threats to product quality and safety, thereby serving as significant obstacles to the widespread adoption of additive manufacturing technology. Consequently, in recent years, non-destructive testing techniques for additive manufacturing products have gained considerable attention in research.</p><p>This paper focuses on components manufactured using the Laser Metal Deposit (LMD) process with AlSi10Mg material. Through a combination of finite element simulations and experimental analysis, this study compares and analyzes the propagation of laser ultrasound within AM components. By examining the characteristics of shear wave reflection signals from internal defects in AM components, a defect quantification method based on a laser ultrasonic (LU) inspection system is proposed. The research findings indicate that this method is capable of detecting sub-millimeter-level internal defects within AM components. Extracting the shear wave reflection signals from defects, enables quantitative assessment of the location and depth of internal defects in AM components.</p></div>","PeriodicalId":52306,"journal":{"name":"International Journal of Lightweight Materials and Manufacture","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2588840424000167/pdfft?md5=0b91bf9197993df04efd26f3d8bc6952&pid=1-s2.0-S2588840424000167-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140274755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Erratum regarding updating Declaration of Competing Interest statements in previously published articles","authors":"","doi":"10.1016/j.ijlmm.2024.02.005","DOIUrl":"https://doi.org/10.1016/j.ijlmm.2024.02.005","url":null,"abstract":"","PeriodicalId":52306,"journal":{"name":"International Journal of Lightweight Materials and Manufacture","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2588840424000155/pdfft?md5=87d2f340b0a128763cc7d94004b429e2&pid=1-s2.0-S2588840424000155-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140632792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of process parameters on the mechanical properties and microstructure in ultrasonic vibration-assisted warm tensile deformation of AZ31 magnesium alloy","authors":"Youchun Huang,&nbsp;Yue Zhang,&nbsp;Juan Liao","doi":"10.1016/j.ijlmm.2024.02.004","DOIUrl":"10.1016/j.ijlmm.2024.02.004","url":null,"abstract":"<div><p>Magnesium (Mg) alloys are becoming popular in lightweight manufacturing due to their low density and high specific strength. However, insufficient slip systems result in poor plasticity of Mg alloys at room temperature. Therefore, an ultrasonic energy field combined with thermal field is introduced to assist the deformation of AZ31 Mg alloy to improve its plasticity. Firstly, ultrasonic vibration (UV)-assisted tensile tests at different temperatures (130–150 °C) are conducted to investigate the effect of UV on material behaviour and the activation of dynamic recrystallization (DRX). Then, the influences of UV on the mechanical properties and microstructure of the material at 150 °C are investigated by varying the parameters of ultrasound amplitude, strain rate, and vibration interval. The results reveal that applying UV can activate DRX at a relatively lower temperature compared with that without UV. Superimposing a certain amount of ultrasonic energy on this material at warm conditions reduces flow stress and increases elongation. In the intermittent ultrasonic vibration (IUV) tests, the DRX percentage and elongation first increase and then decrease as the vibration interval increases. The elongation of specimens with appropriate vibration intervals even exceeds that of specimens with continuous ultrasonic vibration (CUV). However, CUV is more effective than IUV in reducing ultimate tensile strength at different amplitudes or strain rates.</p></div>","PeriodicalId":52306,"journal":{"name":"International Journal of Lightweight Materials and Manufacture","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2588840424000143/pdfft?md5=21135dbd51249aaaa45bfa6d68a78a54&pid=1-s2.0-S2588840424000143-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139878600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of tools rotational speed on the mechanical properties of one-step double-acting friction stir welded aluminum alloy AA 6061 hollow panel","authors":"Mohammad Inggi Hilmawan ,&nbsp;Ericha D.W. Syah Putri ,&nbsp;Nurul Muhayat ,&nbsp;Yupiter H.P. Manurung ,&nbsp;Ilhamdi ,&nbsp;Sulardjaka ,&nbsp;Hendrato ,&nbsp;Triyono","doi":"10.1016/j.ijlmm.2024.02.002","DOIUrl":"10.1016/j.ijlmm.2024.02.002","url":null,"abstract":"<div><p>The utilization of Aluminum hollow panels enhances structural strength while simultaneously ensuring a lightweight and efficient use of materials. During their application, these panels necessitate a welding process that is susceptible to porosity due to the disparity in hydrogen gas solubility between liquid and solid aluminum. Solid-state welding techniques, such as Friction Stir Welding (FSW), have proven to be effective and appropriate solutions for overcoming this issue. However, due to the thickness of the hollow panels, FSW process is unfeasible as it requires welding on both sides, resulting in prolonged production times. Consequently, the development of a one-step double-acting FSW technique becomes necessary, involving the simultaneous utilization of two tools. The usage of two tools introduces two sources of friction-stir forces, heat, and axial forces, demanding an assessment of the novel response from the specimens. This research aims to analyze the effect of a specific parameter, namely the tool rotation speed, within the one-step double-acting FSW process on the physical and mechanical properties of the AA6061 hollow panels. The One-Step Double-Acting FSW process involved conducting variations in the tool rotation speed on both sides of the welds. Specifically, for the 4G weld position (underside of the workpiece with an overhead weld position), speeds of 1200, 1500, and 1800 rpm were employed. Meanwhile, a consistent rotation speed of 1500 rpm was maintained for the 1G weld position (overside of the material with a flat weld position). The transverse speed and tilt angle are set at 30 mm/min and 2°, respectively. Elevating the tool rotation speed results in increased hardness, load capacity, and bending strength of the weld joints. The specimen subjected to the highest rotational speed (1800 rpm) exhibits the most exceptional mechanical properties, including a hardness of 73.46 HVN, load capacity of 18.47 kN, and bending strength of 60.56 MPa.</p></div>","PeriodicalId":52306,"journal":{"name":"International Journal of Lightweight Materials and Manufacture","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S258884042400012X/pdfft?md5=85eac220dfc5da116ab9dca6541bcff2&pid=1-s2.0-S258884042400012X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139827202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of Cf/C-UHTC composite and study of its resistance to oxidation and ablation in high-speed high-enthalpy air plasma flow","authors":"A.N. Astapov ,&nbsp;V.A. Pogodin ,&nbsp;I.V. Sukmanov ,&nbsp;B.E. Zhestkov ,&nbsp;M.V. Prokofiev","doi":"10.1016/j.ijlmm.2024.02.003","DOIUrl":"10.1016/j.ijlmm.2024.02.003","url":null,"abstract":"<div><p>This article contains the results of research on the development of a C_f/C-UHTC carbon fabric composite based on a viscose precursor and a combined matrix consisting of partially sintered ceramics in a system consisting of HfC–HfB₂–NbC–NbB₂–TiC–TiB₂–B₄C–SiC, amorphous carbon, and pyrocarbon. The SiC fraction does not exceed 8.5–9.0 wt%. In its initial state, the composite has open porosity, with apparent and true densities of 18–22%, 2.25–2.29 g/cm³ and 2.79–2.91 g/cm³, respectively. The bending strength and the elasticity modulus are 27.8 ± 0.7 MPa and 7.8 ± 0.2 GPa, respectively, and the fracture strain is 0.85 ± 0.05%. The tests for resistance to oxidation and ablation were carried out in a gas dynamic flow regime and non-equilibrium air plasma heating at flow rates of 4.5–4.8 km/s and breaking enthalpy of 45–50 MJ/kg. Heating was performed in the temperature range <em>T</em>_<em>w</em> = 1400–2700 °C at the critical point on the front surface of the samples. The average linear ablation rate and mass loss rate of the composite are 6.3 ± 0.3 μm/s and 6.22 ± 0.44 mg/s. The estimated value of the conductivity factor is 0.280–0.285 W/(m K). The performance ability of the composite arises from the formation and evolution of a passivating heterogeneous oxide film consisting mainly of titanium niobate Ti₂Nb₁₀O₂₉, mixed solutions of Hf₁₋_xTi_xO₂, (Ti₁₋_xHf_x)₁₋_yNb_yO_z and (Ti₁₋_xHf_x)NbO₄ with broad homogeneity ranges, and also encapsulated carbide and boride particles. It is shown that the oxidation resistance of the composite increases as a result of the transition through a number of phases into a liquid state as the working temperature increases.</p></div>","PeriodicalId":52306,"journal":{"name":"International Journal of Lightweight Materials and Manufacture","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2588840424000131/pdfft?md5=b526ae46620093450c69195fab788bd3&pid=1-s2.0-S2588840424000131-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139872629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}