Materials Letters最新文献

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Fine colonies promote twinning-induced large plasticity in cast Ti-64 alloy

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters

Pub Date : 2025-03-31 DOI: 10.1016/j.matlet.2025.138511

Yuqing Song, Hongchao Kou, Guodong Wang, Mingxiang Zhu, Dian Jiao, Sisi Xie, Jinhong Guo

Ti-6Al-4 V (Ti-64) alloy specimens were prepared using two distinct casting methods, gravity casting and centrifugal casting. The room-temperature tensile results demonstrate that the strength of the alloys prepared by the two casting methods is comparable, but the plasticity of the latter (16 %) is twice as great as that of the former (8 %). Microstructural analysis reveals that the α colony size within the centrifugally casting alloy was smaller, which promoting the formation of {10–12} < -1011 > tensile twins. It in turn favors the plasticity of casting Ti-64 alloy. Basal dislocations are generated within the twin, which decompose at the interface at the tip of the twin causing the interface to shift forward. This is not only indicative of the twin’s role in coordinating deformation but also serves as a mechanism for the further growth of the twin.

引用次数: 0

Enhancing the mechanical characteristics of polylactic acid/thermoplastic starch/TiO2 nanocomposites by melt mixing process

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters

Pub Date : 2025-03-31 DOI: 10.1016/j.matlet.2025.138509

Shams Tabrez, Ansuman Sahoo, Shyama Prasad Mohanty

Research on biodegradable polymer based nanocomposites has gained momentum and several such systems are being explored. In this context, the present work demonstrates the effect of mixing sequence of starch and TiO₂ nanoparticles in polylactic acid (PLA)/starch/TiO₂ nanocomposites prepared by melt mixing method using two-roll mill. Sheets have been prepared by compression moulding and evaluated for their mechanical properties by tensile testing, hardness and impact strength measurements. Enhancement in tensile strength and modulus by 13 % and 16 %, respectively has been observed by changing the mixing sequence of starch and TiO₂. Fractured surfaces of composite specimens have been analyzed by microscopy. Effects have also been observed in gloss and thermal stability of the composites. The outcomes will be useful for the fabrication of various polymeric nanocomposites by melt mixing approach.

引用次数: 0

Potential use of Amazon River sediment as supplementary cementitious material

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters

Pub Date : 2025-03-31 DOI: 10.1016/j.matlet.2025.138510

Ederaldo Da Silva Azevedo , Maurilio Gomes-Pimentel , Adelson Bezerra de Medeiros , Marcelo de Souza Picanço

The Amazonian cities located along the Amazon River rely on river transport to ensure their supply and economic sustainability. However, the accumulation of sediments transported by the river frequently obstructs strategic navigation routes, requiring annual dredging campaigns that remove millions of tons of material, which are typically discarded without economic utilization. Amazon River sediment, however, has immense potential for use as a supplementary cementitious material due to its chemical composition (SiO₂ + Al₂O₃ + Fe₂O₃ = 91.49%) and mineralogical characteristics, which allow its incorporation into cement without compromising essential properties. In this context, this study investigated the partial replacement of up to 30% of Portland cement with sediment, analyzing its properties both in the short term (28 days) and long term (2 years). The results demonstrated that this replacement reduces cement consumption without compromising compressive strength or performance in terms of permeability. In addition to providing a sustainable solution for managing dredged sediments, this approach contributes to mitigating the environmental impacts of the cement industry. Since it does not require calcination, the sediment eliminates the need for thermal energy in its processing, making it a more eco-efficient alternative.

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引用次数: 0

Microstructural investigation of the deformed volume beneath quasi-static and dynamic indentation in Ni single crystal

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters

Pub Date : 2025-03-31 DOI: 10.1016/j.matlet.2025.138506

Kehua Wang , Jian Chen , Yanhuai Li , Zezhou Li , Xiao Tao , Wubian Tian

The deformed volume beneath the Ni (100) single crystal after quasi-static (<10¹ s⁻¹) and dynamic indentation (>10³ s⁻¹) tests were comparatively investigated. The lattice rotation and microstructure were explored using on-axis TKD and TEM methods. The results show that quasi-static indentation induces symmetrical lattice rotation and uniformly distributed sub-grains, while dynamic indentation shows asymmetrical crystal rotation and severe plasticity localization close to the edge of indenter. The observed difference is well interpreted by the dislocation rearrangement and dislocation emission mechanism in quasi-static and dynamic indentation respectively. The heterogeneity of plasticity in dynamic indentation can be attributed to the higher contact stress and pre-existing surface defect on the edge of indenter leading to the concentrated dislocation emission.

引用次数: 0

Surface texturing of poly vinyl alcohol/ bioactive glass composite fibrous mats for improved cell viability of fibroblast cells: A potential approach for improved wound healing

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters

Pub Date : 2025-03-29 DOI: 10.1016/j.matlet.2025.138492

Aleena Tariq , Muhammad Daim Abbas , Aqsa Aizaz , Mohamed Abbas , Faiza Benabdallah , Muhammad Atiq Ur Rehman

Herein, polyvinyl alcohol (PVA)/ bioactive glass (BG) mats were developed using an electrospinning technique and later embossed to modify the surface roughness, wettability, and cell biology. Fabricated mats were characterized by surface topography, wettability, and thermal properties. Atomic Force Microscopy (AFM) images confirmed that the embossing process significantly modified surface roughness, increasing the average roughness from 82.645 nm to 327.92 nm. This increase in roughness improved fibroblast cell attachment. Fourier Transform Infrared Spectroscopy (FTIR) analysis confirmed the presence of chemical bonds, including Si-O-Si stretching from bioactive glass (BG) at 1000–1100 cm⁻¹, the hydroxyl (OH) stretching at 3000 cm⁻¹ from PVA, and the C-O stretching at 1140 cm⁻¹ attributed to the BG and PVA interaction in the mats. Thermo-Gravimetric Analysis (TGA) highlighted the composition of PVA and BG in the fabricated mats. The wettability analysis indicates a notable increase in the hydrophilic character as the contact angle of the mats after embossing significantly dropped from 19 ± 2° to 12 ± 2°. These findings suggested that the embossed PVA/BG mats increase fibroblast cell viability compared to the as-fabricated PVA/BG mats.

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引用次数: 0

Enhanced geopolymer composites with conductive fiber reinforcement: Mechanical, microstructural, and electrical curing performance

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters

Pub Date : 2025-03-29 DOI: 10.1016/j.matlet.2025.138495

Nejib Ghazouani , Abdellatif Selmi , Zeeshan Ahmad , Nabil Ben Kahla , Abdelkader Mabrouk

This study investigates the effects of conductive additives—basalt fiber (BF), steel fiber (SF), wire erosion (WE), and carbon black (CB)—on the mechanical and microstructural properties of geopolymer (GP) cured via electricity-driven thermal curing. A series of 13 GP mixes, incorporating varying fiber concentrations (0.25 %, 0.50 %, 0.75 %), were evaluated for compressive strength (CS), flexural strength (FS), and ultrasonic pulse velocity (UPV). The optimal formulation with 0.5 % WE, exhibited a peak CS of 65.34 MPa, a 94.36 % increase over the control. FS peaked at 16 MPa for 0.75 % WE. UPV results indicated enhanced material densification, with 0.25 % BF reaching a maximum of 2317.83 m/s. SEM/EDX analysis confirmed improved microstructural integrity, while XRD analysis verified geopolymerization.

引用次数: 0

Construction of dense SiO2 layers by ferric phytate to enhance flame retardancy of polydimethylsiloxane foam composites

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters

Pub Date : 2025-03-29 DOI: 10.1016/j.matlet.2025.138486

Mengmeng Yang, Xin He, Yong Fang, Hu Bi, Guodong Jiang, Yucai Shen

Polydimethylsiloxane (PDMS) foam is a widely used porous material with excellent properties across various fields. However, its flammability poses a significant challenge to its broader application. In this study, ferric phytate (PA-Fe) was introduced as a novel flame retardant into PDMS foam. Experimental and molecular dynamics (MD) simulation results reveal that its exceptional flame retardancy derives from the formation of dense SiO₂ layers induced by Fe³⁺ during combustion. These SiO₂ layers exhibit more dense structure compared to those generated by pure PDMS foam combustion, providing the foam with enhanced self-extinguishing properties. This study offers a novel strategy for developing highly flame-retardant silicone materials.

引用次数: 0

Growth and ultralow thermal conductivity of beta-Ga2O3 nanowires

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters

Pub Date : 2025-03-29 DOI: 10.1016/j.matlet.2025.138425

Jiafu Zhong , ZhiJie Wang , Zuoran Li , Lijie Zhu , Shiyun Lou , Shaomin Zhou

β-Ga₂O₃ nanowires were prepared on C-plane sapphire substrates with coated Au serving as a catalyst via chemical vapor deposition. The morphologies, structural properties and elemental composition of the products were characterized by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy and Raman spectroscopy. The results show that the products are single crystalline β-Ga₂O₃ nanowires with the diameter ranging from 40 to 100 nm and the length ranging from 10 to 50 μm, respectively. In addition, the optical and thermal properties of the β-Ga₂O₃ nanowires have been studied by photoluminescence spectrometer and laser thermal conductivity instrument. These β-Ga₂O₃ nanowires have exhibited a broad blue-green emission with a peak at 487 nm and an ultralow thermal conductivity (0.026 W/m K) in the room-temperature, which is potential application in the future.

引用次数: 0

Microstructural evolution and hierarchical synergy in maraging steels: Tailoring strength and ductility through austenite reversion

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters

Pub Date : 2025-03-29 DOI: 10.1016/j.matlet.2025.138494

M. Masoumi , B. Fonseca , M. Béreš , M.J. Silva-Neto , H.F.G. Abreu

This study investigates the microstructural evolution and phase transformations in advanced maraging steel, emphasizing the interplay between reverted austenite, martensite, and nanoprecipitates. X-ray diffraction confirmed 9.8 ± 0.3 vol% retained austenite, while nanoindentation revealed its stress-assisted transformation, enhancing ductility via the TRIP effect. Aging at 560 °C preserved the martensitic laths, promoting microchemical diffusion and austenite reversion. EBSD analysis highlighted Kurdjumov-Sachs orientation relationships and dislocation dynamics, linking lattice distortion to mechanical strength. This hierarchical nanostructural synergy enhances ductility and toughness with minimal reduction in strength by combining hard nanoprecipitates and soft reverted austenite within the martensitic structure.

引用次数: 0

Improving the electromagnetic interference shielding performance of CNTs/copper composites by interface modification with a carbon buffer layer

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters

Pub Date : 2025-03-29 DOI: 10.1016/j.matlet.2025.138489

Yingying Yu , Cheng Yang , Qian Gong , Yutao Niu , Huili Fu , Zhenmin Luo , Yongyi Zhang

Electromagnetic interference (EMI) poses a significant threat to human health and electronic devices, necessitating the development of effective shielding materials. While metals offer excellent EMI shielding performance, their weight, corrosion susceptibility, and cost limit their applications. Composites of carbon nanotubes (CNTs) and metals are promising candidates for light-weight EMI shielding materials, while compromise always has to be made between the EMI shielding performance and the weight. This study investigates a novel approach to enhance the EMI shielding performance of CNT/copper composites avoiding weight increase by introducing a highly disordered graphite nanosheet (HDGN) buffer layer between the CNTs and copper. The HDGN buffer effectively fills gaps in the CNT network, creating a smooth and continuous interface with the copper layer. This modification significantly improves the electrical conductivity and EMI shielding effectiveness (EMI SE) of the composites. This study highlights the crucial role of the metal/carbon interface in determining the EMI shielding performance, offering valuable insights for the design and optimization of lightweight, flexible, and efficient EMI shielding materials.

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引用次数: 0

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