Journal of Materials Research and Technology-Jmr&t最新文献

{"title":"Enhancing anti-adhesion and wear performance at armature/rail interface through synergistic interfacial energy and lubrication effects","authors":"Jia-Chen Zhao ,&nbsp;Peng-Cheng Zhang ,&nbsp;Zhi-Yuan Huang ,&nbsp;Wan-Li Song ,&nbsp;Jie Pan ,&nbsp;Xuan Xu ,&nbsp;Li-Xue Chen ,&nbsp;Xiang Chen ,&nbsp;Cheng Zhang ,&nbsp;Lin Liu","doi":"10.1016/j.jmrt.2025.03.145","DOIUrl":"10.1016/j.jmrt.2025.03.145","url":null,"abstract":"<div><div>During electromagnetic launch (EML) process, the adhesion of aluminum to high-strength copper-alloy rails poses a significant challenge, severely deteriorating the performance and lifetime of rails. Previous researches were primarily centered to the surface modification of copper-alloy rail with coatings. However, this process is time- and money-consuming, and raises sustainability concerns during multi-firing operations. In contrast, the modification of aluminum-a armature, featured with simplicity and economy, may offer an alternative approach for alleviating aluminum adhesion on rails. Here, we propose a novel strategy for modifying the aluminum armature surface with the combination of positive interfacial energy and lubrication effects. This is accomplished by applying a newly designed (Ti, W)N–MoS₂ coating to the aluminum armature through magnetron sputtering. Results indicate that this coating highly reduces the coefficient of friction between Cu-alloy and the coated Al-alloy from 0.56 to 0.14. The simulated EML demonstrates that the coating remarkably decreases aluminum adhesion by 97.7 %. Density functional theory (DFT) simulations reveal that the improved performance of wear between armature and rail is attributed to the synergistic effects of the formed (Ti, W)N and non-stoichiometric Mo₁₅S₁₉ phases in coating, where the former exhibits positive interfacial energy with Cu, while the later serves as a lubricator, both work together and lead to ultra-low coefficient of friction and significant reduction of Al adhesion on Cu rail.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"36 ","pages":"Pages 692-698"},"PeriodicalIF":6.2,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143680455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interfacial microstructure evolution and tensile behavior of Sn-xAg micro solder joints during aging","authors":"Taikun Hao,&nbsp;Yuanyuan Qiao,&nbsp;Ning Zhao","doi":"10.1016/j.jmrt.2025.03.146","DOIUrl":"10.1016/j.jmrt.2025.03.146","url":null,"abstract":"<div><div>The microstructure evolution and tensile behavior of Sn-<em>x</em>Ag/Cu micro solder joints during isothermal aging were investigated. The Ag content not only affected the initial orientation and morphology of interfacial Cu₆Sn₅ grains, but also precipitated as Ag₃Sn particles on the surface of the Cu₆Sn₅ gains to exhibit a shielding effect. As a result, the coupling effect dominated the growth behavior of both Cu₆Sn₅ and Cu₃Sn interfacial IMCs. The IMC growth was controlled by grain boundary diffusion for the joints with <em>x</em> &lt; 2.0 wt%; when <em>x</em> ≥ 2.0 wt%, it was co-controlled by both bulk diffusion and grain boundary diffusion. The final total thickness of the IMCs followed the trend: Sn-0.5Ag &lt; Sn &lt; Sn-5.0Ag &lt; Sn-2.0Ag &lt; Sn-3.5Ag. Additionally, the effect of Ag content on the tensile strength of the as-soldered and aged solder joints was discussed in view of fracture morphology. Mixed ductile-brittle fracture mode was observed in the as-soldered joints, while ductile fracture mode was observed in the aged joints. The Sn-3.5Ag/Cu showed the thickest IMCs with preferred orientated Cu₆Sn₅ and the lowest proportion of Cu₃Sn; while the Sn-0.5Ag/Cu showed little effect on Cu₆Sn₅ grain orientation similar to Sn/Cu, but presented the lowest decrease in tensile strength after aging. The results could provide theoretical support for optimizing the composition of Ag-bearing solders.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"36 ","pages":"Pages 680-691"},"PeriodicalIF":6.2,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143680454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of selected tramp elements in medium carbon steels on the deformation behavior of non-metallic inclusions and phase transformations","authors":"Julian Cejka ,&nbsp;Isabell Gruber ,&nbsp;Gerald Klösch ,&nbsp;Susanne K. Michelic","doi":"10.1016/j.jmrt.2025.03.150","DOIUrl":"10.1016/j.jmrt.2025.03.150","url":null,"abstract":"<div><div>Scrap recycling is one of the major pillars of the steel industry's green transformation. It is important, however, to consider the available scrap's tramp element levels. While non-metallic inclusions (NMIs) and tramp elements are both considered to be part of steel cleanness, their interplay is hardly investigated. Therefore, this work focuses on the impact of tramp elements on NMIs in three medium carbon steels in solid state. The elements studied are copper, molybdenum, tin, and nickel. The deformation behavior of NMIs of the steels is evaluated by dilatometric deformation via the change of aspect ratio using automated SEM/EDS analyses. Furthermore, the effect of these tramp elements on the microstructure using quenching dilatometry is studied via dilatometric curves and light microscopy after etching. It is shown that especially copper (additions of 0.25 wt.-% and 0.5 wt.-%) impacts the deformation behavior of NMIs by reducing the change of aspect ratio and also increases the share of hard phases in the microstructure where in one steel bainite is formed while without copper the microstructure is ferritic-pearlitic with the same cooling rate. However, adding 0.1 or 0.2 wt.-% nickel causes the opposite effect on deformation and microstructure while the added levels of tin (0.03 wt.-%) and molybdenum (max. 0.08 wt.-%) have not influenced the NMI deformation behavior significantly. With the changes in NMI behavior and steel microstructure, fracture toughness has to be re-evaluated.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"36 ","pages":"Pages 513-521"},"PeriodicalIF":6.2,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143644738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructures and tribological properties of laser-clad FeCrAl-TiX composite coatings on ferritic-martensitic steel","authors":"Shuangshuang Zhong ,&nbsp;Linjiang Chai ,&nbsp;Zhichen Wang ,&nbsp;Tao Yang ,&nbsp;Yuanzhuo Liu ,&nbsp;Haiyu Dong ,&nbsp;Jing Shen ,&nbsp;Ying Li ,&nbsp;Eric Jianfeng Cheng ,&nbsp;Xing Yin ,&nbsp;Hao Wang","doi":"10.1016/j.jmrt.2025.03.139","DOIUrl":"10.1016/j.jmrt.2025.03.139","url":null,"abstract":"<div><div>To enhance the surface performance of ferritic-martensitic (FM) steel for potential nuclear application, three defect-free FeCrAl-TiX composite coatings (namely FeCrAl–TiC, FeCrAl–TiN, and FeCrAl–TiB₂) were fabricated on a typical FM steel by employing laser cladding. Various characterization techniques were jointly used to meticulously examine the microstructures of these coatings, which were then correlated with their hardnesses and tribological properties. Results indicate that the cladding zones (coatings) of all laser-clad specimens primarily consist of finely equiaxed grains. The FeCrAl–TiC and the FeCrAl–TiB₂ coatings have grain sizes of 2.0 ± 1.3 μm and 1.5 ± 0.6 μm, respectively, smaller than that of the FeCrAl–TiN coating (2.9 ± 1.5 μm). The TiC, TiN, and TiB₂ particles added into the premixed powders are dissolved during the laser cladding and then re-precipitate as fine granular TiC, strip-like and petal-like TiN, granular TiB₂ and net-like Cr₂B₃ compounds in these coatings, respectively. The heat-affected zones of all three laser-clad specimens primarily consist of fine martensitic laths and a small number of blocky ferrites, with a thickness of approximately 85–95 μm. The wear rates of the FeCrAl–TiC, FeCrAl–TiN, and FeCrAl–TiB₂ coatings are determined to be 0.7 × 10⁻⁵ mm³ N⁻¹ m⁻¹, 2.5 × 10⁻⁴ mm³ N⁻¹ m⁻¹, and 1.2 × 10⁻⁵ mm³ N⁻¹ m⁻¹, respectively. Notably, the FeCrAl–TiC and the FeCrAl–TiB₂ coatings have wear rates much lower than the substrate (2.9 × 10⁻⁴ mm³ N⁻¹ m⁻¹), indicating significantly enhanced wear resistance. Comprehensive analyses reveal that their superior tribological performances could be ascribed to synergistic effects of multiple hardening/strengthening mechanisms resulting from adding TiC and TiB₂ ceramic particles.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"36 ","pages":"Pages 922-938"},"PeriodicalIF":6.2,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143680391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancement of hardness and high-temperature oxidation resistance of Cr/FeCrAl dual-layer plasma-sprayed coating on Zr substrate by post-processing","authors":"Nan Li ,&nbsp;Liang-Yu Chen ,&nbsp;Ze-Xin Wang ,&nbsp;Hao-Nan Xuan ,&nbsp;Lin-Jiang Chai ,&nbsp;Hui-Long Yang ,&nbsp;Dubovyy Oleksandr ,&nbsp;Sheng Lu","doi":"10.1016/j.jmrt.2025.03.144","DOIUrl":"10.1016/j.jmrt.2025.03.144","url":null,"abstract":"<div><div>A Cr/FeCrAl dual-layer coating was deposited on a Zr alloy substrate using atmospheric plasma spraying (APS) to potentially consider the requirement of both loss-of-coolant accidents (LOCA) and normal operating conditions of nuclear cladding cores. The as-sprayed coatings have disadvantages, such as porosity and lamellar structures. Hence, post-processing methods were employed to enhance the compactness of the Cr/FeCrAl coating. This work investigates the effects of two distinct post-processing methods on the microstructure, hardness, and high-temperature resistance of the Cr/FeCrAl dual-layer coatings. The Cr/FeCrAl coating subjected to layer-by-layer post-processing exhibited reduced porosity and increased hardness compared to the coating post-processed after spraying. Oxidation at 1000 °C for 180 min resulted in large-area oxidation cracks in the Cr/FeCrAl coating. Upon oxidation at 1200 °C for 60 min, the Cr/FeCrAl coating that underwent layer-by-layer post-processing demonstrated significant improvements in the oxidation resistance of the Zr alloy. In contrast, the Cr/FeCrAl coating that underwent layer-by-layer post-processing effectively enhanced the oxidation resistance of the zirconium alloy.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"36 ","pages":"Pages 500-512"},"PeriodicalIF":6.2,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of trace boron on the microstructural characteristics, hot-workability and mechanical properties of a high Mn-modified β-solidifying γ-TiAl intermetallic compound","authors":"Pengjia Wang ,&nbsp;Junjie Hao ,&nbsp;Peng Xue ,&nbsp;Chaoran Liang ,&nbsp;Baoying Peng ,&nbsp;Bo Chen ,&nbsp;Xiaobing Li ,&nbsp;Kui Liu","doi":"10.1016/j.jmrt.2025.03.129","DOIUrl":"10.1016/j.jmrt.2025.03.129","url":null,"abstract":"<div><div>An isothermal compression simulation experiment under conditions of 1100∼1250 °C, 0.001–10 s⁻¹ was conducted to study the hot deformation behavior of the Ti–42Al–5Mn-0.3B (at. %) intermetallic compound, prepared by vacuum induction melting. A hot processing map and constitutive equation were established. Based on these findings, Ti–42Al–5Mn and Ti–42Al–5Mn-0.3B ingots were prepared using un-packing forging. The room temperature and high temperature tensile properties of the forged alloys were tested. The effects and mechanisms of trace B addition on the microstructures of the as-cast and forged alloys, hot-workability, as well as the mechanical properties of the forged alloys, were systematically analyzed. The results show that, regardless of the as-cast or forged conditions, the addition of 0.3 at. % B increases the α₂ phase content and decreases the γ phase content, with the influence being more pronounced in the as-cast condition than in the forged condition. In the as-cast condition, 0.3 at. % B addition not only eliminates the coarse Widmanstätten lamellar structure to form an equiaxed lamellar structure, but also reduces the content and size of the β_o phase. These microstructural changes result in lower flow stress and apparent activation energy (<em>Q</em>) for the B-containing alloy compared to the alloy without B, leading to improved hot workability. In the as-cast condition, curved flaky TiB with orthorhombic B27 structure precipitates and coexists with the B2 phase, which can be fragmented into dispersed particles or short rods during hot forging deformation. This fragmentation significantly refines the lamellar colony size and lamellar spacing, thus enhancing the strength and ductility of the alloy at both room and high temperatures.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"36 ","pages":"Pages 823-837"},"PeriodicalIF":6.2,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143680388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructures and mechanical properties of FSWed Fe-xAl and Fe-0.1C-xAl alloys","authors":"Junqi Chen,&nbsp;Takuya Miura,&nbsp;Kohsaku Ushioda,&nbsp;Hidetoshi Fujii","doi":"10.1016/j.jmrt.2025.03.140","DOIUrl":"10.1016/j.jmrt.2025.03.140","url":null,"abstract":"<div><div>The microstructural evolution and mechanical properties of SZs of FSWed Fe-(0.05, 2, 5)Al and Fe-0.1C-(0.05, 5)Al steels were investigated. The hot rolled bands were heat-treated at 700 °C for 30 min prior to FSW. Phase diagram calculations, along with EDS, TEM, and Kikuchi pattern analyses by SEM-EBSD, confirmed the presence of cementite (Fe₃C, Orthorhombic) in Fe-0.1C-0.05Al and κ-carbides (Fe₃AlC_x, L1₂ perovskite-type structure) in Fe-0.1C-5Al. FSW significantly refined grain sizes of 8.6 μm–4.6 μm and altered carbide morphologies. During the process, coarse cementites in BM were fragmented into smaller particles, while κ-carbides in the BM changed to smaller κ-carbides together with very small cementites at grain boundaries. Higher Al and C contents synergistically strengthened SZs mainly through grain refinement, solid solution, and precipitation strengthening. Specifically, the elongation of the SZs decreased with increasing Al content in Fe-xAl alloys, whereas it increased with the addition of 5 wt% Al in Fe-0.1C-xAl alloys. Furthermore, both the ductile-brittle transition temperature (DBTT) and upper shelf energy increased with Al content. The DBTT increment with 0.1 wt% C addition was much larger in the 0.05 wt% Al alloys compared to the 5 wt% Al alloys. These features of ductility and toughness of the SZs are attributed to the changes in carbides with the 5 wt% Al addition. Below the DBTT, cracks in the Fe-0.1C-0.05Al alloy initiated within cementite and propagated into ferrite, while in the Fe-0.1C-5Al alloy, cracks formed and propagated into the ferrite matrix despite the presence of κ-carbides and fine cementite.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"36 ","pages":"Pages 888-902"},"PeriodicalIF":6.2,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143680492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The influence of internal defects on the fatigue behavior of 4032D polylactic acid in fused deposition modeling","authors":"Liang Wang,&nbsp;Zhibing Liu,&nbsp;Tianyang Qiu,&nbsp;Liangfeng Deng,&nbsp;Yutian Zhang,&nbsp;Xibin Wang","doi":"10.1016/j.jmrt.2025.03.138","DOIUrl":"10.1016/j.jmrt.2025.03.138","url":null,"abstract":"<div><div>The impact of microstructural defects on the service performance of structural components produced via additive manufacturing is a critical challenge. This study introduces an innovative method for quantitatively characterizing internal defects and predicting the fatigue performance of polylactic acid (PLA) parts fabricated by Fused Deposition Modeling (FDM). High-resolution computed tomography (CT) is employed to accurately map the location, size, and morphology of internal defects in FDM-processed PLA. Monotonic tensile and fatigue tests are conducted to assess the influence of PLA specimens on fatigue behavior. A novel fatigue life prediction framework is developed by integrating defect size and structural characteristics, utilizing both extreme value statistics and the Murakami model to predict the fatigue limit. The results show that the Gumbel distribution effectively describes the internal defect size distribution, with the largest detected defect measuring up to 4.09 μm. The fatigue limit prediction exhibits only a 6.77 % discrepancy between model calculations and experimental results. Additionally, an enhanced X-parameter-based fatigue life assessment model is proposed, which significantly improves the reliability of fatigue life predictions for FDM-fabricated 4032D PLA specimens.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"36 ","pages":"Pages 548-560"},"PeriodicalIF":6.2,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143680767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reinforcement of injectable hydrogels through melt electro-written structures: Influence of shape and pore size on the injection force","authors":"Diego Trucco ,&nbsp;Rory Gibney ,&nbsp;Lorenzo Vannozzi ,&nbsp;Gina Lisignoli ,&nbsp;Daniel J. Kelly ,&nbsp;Leonardo Ricotti","doi":"10.1016/j.jmrt.2025.03.133","DOIUrl":"10.1016/j.jmrt.2025.03.133","url":null,"abstract":"<div><div>Hydrogels are commonly used for tissue engineering applications due to their high water content, biocompatibility, injectability, and ability to mimic the extracellular matrix of native tissues. However, their weak mechanical properties limit their use, especially in load-bearing applications. In this study, we developed fibrous architectures with a pre-defined shape using melt electro-writing (MEW) to strengthen injectable hydrogels. We assessed the injection forces required to successfully extrude the hydrogel reinforced with MEW-printed structures, varying their geometry (square/hexagonal pores) and pore sizes (0.6, 0.8, 1.0 mm) through needles having a size compatible with clinical applications. Our findings indicate that MEW structures with hexagonal pores exhibit a higher tensile modulus than those with square pores. Additionally, the injection forces required to extrude hydrogels embedding MEW structures through needles were greater for hexagonal pores. Thinner pores and smaller needle diameters resulted in higher injection forces; a few conditions among the ones tested were compatible with the limits defined by the EU ISO 7886–1:2018 standard. After injection and crosslinking, hydrogels reinforced with MEW structures showed improved mechanical properties (up to 6.34-fold), particularly when structures with hexagonal pores were used.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"36 ","pages":"Pages 358-368"},"PeriodicalIF":6.2,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unraveling the structure-properties correlation in thermal insulating and mechanically stiff PLA aerogels","authors":"J. Lledó ,&nbsp;J. Martín-de León ,&nbsp;T.E. Gómez Álvarez-Arenas ,&nbsp;M.A. Rodríguez-Pérez ,&nbsp;B. Merillas","doi":"10.1016/j.jmrt.2025.03.135","DOIUrl":"10.1016/j.jmrt.2025.03.135","url":null,"abstract":"<div><div>In this study, the relationship between the porous structure of polylactic acid-based (PLA) aerogels and their thermal insulation performance have been studied in detail. Different polymer contents were used for the fabrication of these aerogels leading to a wide range of low densities (36–167 kg/m³), porosities over 86 % and high crystallinity degrees (63–69 %). Their nanofibrillar structures led to high specific surface areas (79–91 m²/g), thin fibers (105–340 nm), and small pores (658–3140 nm). The mechanical performance and thermal insulating behavior have been deeply investigated, analyzing the involved mechanisms. The produced aerogels showed high stiffness with elastic modulus from 0.15 MPa to 12.82 MPa and compressive strengths of up to 540 kPa, significantly higher values than the traditional insulating materials, combined with remarkably low thermal conductivity values between 34.83 and 27.11 mW/m∙K, the lowest value found for PLA of aerogels to date. In addition, thermal conductivity was modeled, and the contributions of the different heat transfer mechanisms were calculated. The obtained results have been related to the different PLA aerogel samples and structural characteristics, obtaining a deep understanding of the relationship between the production process, porous structure, and the final mechanical and thermal insulating performance.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"36 ","pages":"Pages 641-652"},"PeriodicalIF":6.2,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143680691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}