Article
Thermodynamics
Qian Ding, Hao Fu, Chaoran Hua, Xinman Jiang, Jia Yu, Keming Zhu
Summary: This study investigates the crystallization behavior, melting characteristics, and semicrystalline morphologies of wollastonite-filled recycled polypropylene (R-PP) composites with and without beta-nucleating agent. The addition of beta-nucleating agent can significantly increase the beta-phase content in wollastonite-filled R-PP composites, providing an effective method for achieving high value-added and low-cost recycling of R-PP.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Materials Science, Multidisciplinary
Jiajun Guo, Ying Wu, Min Nie, Qi Wang, Xiaoying Lu
Summary: The growth mechanisms of 0-nucleated polypropylene random copolymers (PPR) on isotactic polypropylene (iPP) and the benchmarks were systematically revealed and discussed. The results show that the morphologies and polymorph compositions of PPR can be regulated by controlling the relative sizes of core and shell crystals. This easy preparation strategy of 0-PPR allows diversified thermal processing of PPR/iPP/0-NA composites.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Polymer Science
Shupin Luo, Chao Lv, Liang Chang, Wenjing Guo
Summary: This research investigated the effect of introducing self-assembling beta-nucleating agents into the polypropylene matrix to improve the toughness of wood flour/polypropylene composites. The results showed that the nucleating agents effectively induced beta-crystal formation, decreased spherulite size, increased crystallization temperature, and accelerated the crystallization process. The addition of the nucleating agents significantly improved the toughness and crystallization of the composites.
Article
Engineering, Chemical
Wojciech Hubert Bednarek, Adam Marek, Beata Strzemiecka, Joanna Szymanska, Dominik Paukszta
Summary: This research focuses on the crystallization and supermolecular structure of polypropylene waxes, commonly used in composites technology. Using various analytical techniques, the study describes and analyzes the morphology and crystallinity of these waxes, highlighting the impact of degradation and oxidation treatments on their structure. The results provide important insights into the supermolecular structure of polypropylene waxes.
POLYMER ENGINEERING AND SCIENCE
(2022)
Article
Polymer Science
Stan F. S. P. Looijmans, Hamid Ahmadi, Patrick D. Anderson, Lambert C. A. van Breemen
Summary: Despite the maturity of the technology, processing of fiber-reinforced thermoplastic materials remains challenging. This study investigated the effect of adhesion enhancement on material properties and found that the addition of a compatibilizer agent has minimal effect on modulus and yield stress, but significantly reduces strain-at-break. In-situ X-ray characterization methods revealed that the role of phase composition and morphology is more pronounced in deformation and failure mechanisms than the increased adhesion. These findings suggest a new route towards tougher fiber-reinforced composites with reduced complexity.
Article
Polymer Science
Amina Benarab, Enrique Blazquez-Blazquez, Rachida Krache, Rosario Benavente, Maria L. Cerrada, Ernesto Perez
Summary: The composites prepared with silanized DSF demonstrated excellent performance, including enhanced PPR crystallization, reduced hydrophilicity of the date stone flour, improved interfacial adhesion with the polymer, and enhanced mechanical properties.
Article
Polymer Science
Coro Echeverria, Irene Limon, Alexandra Munoz-Bonilla, Marta Fernandez-Garcia, Daniel Lopez
Summary: This study successfully prepared PLA fibers with high macromolecular alignment and in beta polymorph without the need for post-processing.
Article
Polymer Science
Liyuan Liu, Ying Zhao, Chunbo Zhang, Zhiyuan Dong, Kezhi Wang, Dujin Wang
Summary: The research investigated the impact of the morphological characteristics of N,N'-dicyclohexylterephthalamide (DCHT) on the polymorphic composition of isotactic polypropylene (iPP), showing that small-sized DCHT crystals have a greater influence on the formation of beta-crystals.
Article
Engineering, Multidisciplinary
Wenjun Fang, Xujing Yang, Xinxin Xu, Weiwei Li, Qing Li
Summary: The study reveals the influence mechanism of cooling rates on the mechanical properties of CGF/PPR composites, showing that the tensile strength and impact resistance vary with cooling rates, with the presence of boundary defects and lamellae thickness playing important roles in the overall performance.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Polymer Science
Binghua Wang, Ziyuan Zhou, Shanshan He, Yajuan Zhang, Jingbo Chen, Changyu Shen, Bin Zhang
Summary: The melting-recrystallization characterizations of quenched beta-iPP lamellar crystals were studied using the self-seeding method. The presence of lath-like alpha-iPP crystals and the two slopes observed in the plot of N alpha versus Ts indicate the influence of beta alpha-recrystallization and alpha alpha-recrystallization on the process. It was found that the preferred route of recrystallization depends on the thermal stability of the initial beta phase.
Article
Materials Science, Paper & Wood
Ali Hassanpoor Tichi, Hadi Gholamiyan
Summary: This study investigated the effect of wollastonite on the properties of composites made of sesame stem and gypsum. The results showed that adding wollastonite improved the physical and mechanical properties of the boards. The addition of 10% wollastonite was recommended to enhance the fire retardancy of the boards.
Article
Polymer Science
Konstantinos Leontiadis, Costas Tsioptsias, Stavros Messaritakis, Aikaterini Terzaki, Panagiotis Xidas, Kyriakos Mystikos, Evangelos Tzimpilis, Ioannis Tsivintzelis
Summary: The thermal and mechanical properties of polypropylene-wollastonite composite drawn fibers were optimized using the Box-Behnken approach. The drawing ratio and filler content were found to be the most important factors for enhancing tensile strength. The addition of a compatibilizer had a multiple effect on the final properties.
Article
Chemistry, Physical
Diego Villarreal-Martinez, Hector Eduardo Gutierrez-Paramo, Ana Laura Martinez-Hernandez, Carlos Velasco-Santos, Armando Almendarez-Camarillo
Summary: In this study, graphene nanoplatelets (GnPs) were oxidized and functionalized with pimelic acid (PA). The chemical modification was confirmed by the presence of characteristic bands in the IR spectra and an increase in the D/G ratio in XRD and RAMAN. The modified GnPs were added to an iPP matrix and showed improved beta nucleating ability and enhanced visco-elastic properties, as indicated by DSC, WAXD, and DMA measurements. The impact strength of the nanocomposite was also significantly higher than the raw iPP.
Article
Medicine, Research & Experimental
Chiara Cappuccino, Enrico Spoletti, Fiammetta Renni, Elisabetta Muntoni, Jennifer Keiser, Dario Voinovich, Beatrice Perissutti, Matteo Lusi
Summary: In this study, the solid form characteristics of the solid solutions of praziquantel with both enantiomers of malic acid and tartaric acid were investigated. Two new cocrystals were discovered and three non-stoichiometric, mixed crystal forms were identified and isolated. Thermal and solubility analysis showed that the newly prepared solid solutions had a fourfold solubility advantage over the pure drug. In addition, a pharmacokinetic study in rats was conducted, and innovative mini-capsules were used for the oral administration of the solid samples. The available data suggested that the faster dissolution rate of the solid solutions resulted in faster absorption of the drug and helped maintain a constant steady-state concentration.
MOLECULAR PHARMACEUTICS
(2023)
Article
Materials Science, Composites
Jier Y. Han, Tianran Chen, Qingmin Mu, Donald G. Baird
Summary: This research aimed to enhance the mechanical properties of wholly thermoplastic composites (WTCs) used in fused filament fabrication (FFF) by using multiscale thermoplastic composites. Significant improvements were observed in tensile properties, particularly in tensile modulus and strength, when reinforcing WTCs with polypropylene (PP) with thermotropic liquid crystalline polymer (TLCP) and carbon nanotubes (CNTs). The advanced interfacial adhesion between TLCP fibrils and matrix resulted in an enhancement in the tensile strength.
POLYMER COMPOSITES
(2021)
Article
Nanoscience & Nanotechnology
Ahmad Mirzaei, Peter D. Hodgson, Xiang Ma, Vanessa K. Peterson, Ehsan Farabi, Gregory S. Rohrer, Hossein Beladi
Summary: This study investigated the influence of parent austenite grain refinement on the intervariant boundary network in a lath martensitic steel. It found that refining the parent austenite grain led to a decrease in the fraction of certain boundaries in the martensite and an increase in the connectivity of low energy boundaries, ultimately improving the impact toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
N. L. Church, C. E. P. Talbot, L. D. Connor, S. Michalik, N. G. Jones
Summary: Metastable beta Ti alloys based on the Ti-Nb system have attracted attention due to their unique properties. However, the unstable cyclic behavior of these alloys has hindered their widespread industrial use. Recent studies have shown that internal stresses, including those from dislocations, may be responsible for this behavior. This study demonstrates that inter-cycle thermal treatments can mitigate the unstable cyclic behavior, providing a significant breakthrough in our understanding of Ti-Nb superelastic materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Di Zhao, Chenchen Zhao, Ziyang Xiu, Jiuchun Yan
Summary: This study proposes a novel strategy for achieving the bonding of SiC ceramic and Al alloy using ultrasound. The ultrasound promotes the dissolution of Al into the solder, activating the solder and triggering the interfacial reaction between SiC ceramic and solder. With increasing ultrasonic duration, the bonding between SiC and Al transitions from partial to full metallurgical bonding.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Kang Du, Yang Zhang, Guangda Zhao, Tao Huang, Liyuan Liu, Junpeng Li, Xiyu Wang, Zhongwu Zhang
Summary: This paper systematically investigated the evolution of microstructure in Fe-Ni-Co-Al polycrystalline alloys and its effects on mechanical properties. The results revealed that the migration of grain boundaries in different processes is driven by different factors, which impacts the grain orientation and precipitate formation. In the process of directional recrystallization, grains with specific orientations grow in the grain boundary region and form the dominant orientation, while grains with lower migration rate form the minor orientation. The alloy produced through directional recrystallization exhibited good recoverable strain and superelastic strain, while the alloy produced through solid solution treatment showed no evident superelastic behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Edohamen Awannegbe, Liang Chen, Yue Zhao, Zhijun Qiu, Huijun Li
Summary: This study employed laser metal deposition to additively manufacture Ti-15Mo wt% alloy, and subsequently subjected it to post-fabrication uniaxial thermomechanical processing. The results showed that different zones in the microstructure remained after processing, and deformation mechanisms mainly involved slip and martensite formation. The compressive mechanical properties were found to be dependent on strain rate, with higher flow stress and compressive strength observed at higher strain rates. Grain structure homogenisation was not achieved, leading to anisotropic tensile properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Reza Khatib Zadeh Davani, Enyinnaya George Ohaeri, Sandeep Yadav, Jerzy A. Szpunar, Jing Su, Michael Gaudet, Muhammad Rashid, Muhammad Arafin
Summary: This research aims to investigate the effect of roughing and finishing reductions on crystallographic texture. The results show significant heterogeneity in the centerline region, with higher intensity of certain textures. Drop Weight Tear Test indicates that steel specimens with lower and medium reductions exhibit superior low-temperature impact toughness compared to steel with higher reductions. The electrochemical hydrogen charging experiments confirm the presence of internal hydrogen cracks only in steel with lower and medium reductions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Flavio De Barbieri, Denis Jorge-Badiola, Rodrigo Allende, Karem Tello, Alfredo Artigas, Franco Perazzo, Henry Jami, Juan Perez Ipina
Summary: This study examines the effect of Cr additions on the mechanical behavior of TWIP steel at temperatures ranging from 25°C to 350°C. The results indicate that different temperature-dependent strengthening mechanisms, including mechanical twinning, Dynamic Strain Aging, and slip bands, are at play. The stacking fault energy (SFE) influences the percentage of mechanical twinning, which in turn affects the strain hardening rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Hanlin Peng, Siming Huang, Ling Hu, Bingbing Luo, Liejun Li, Ian Baker
Summary: This study explores the weldability, microstructures, and mechanical properties of two L1(2)-nanoparticle-strengthened medium-entropy alloys after electron beam welding (EBW). The results show that strong yet ductile defect-free joints were produced, with larger grain sizes in the fusion zones compared to the heat-affected zones and base materials. Both EBWed MEAs exhibited high yield strengths, high ultimate tensile strengths, and good fracture strains at 77 K. The V-doping improved the cryogenic mechanical properties of the TMT MEA.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yongxin Wang, Lei Chen, Lizi Shao, Shuo Hao, Motomichi Koyama, Xingzhou Cai, Xiaocong Ma, Miao Jin
Summary: This study investigated the tensile deformation behavior of an Mn-N bearing lean duplex stainless steel with metastable austenite. The results showed that the strain rate had significant influence on the work hardening, strain-induced martensitic transformation, and fracture mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Jong Woo Won, Seulbi Lee, Hye-Jeong Choe, Yong-Taek Hyun, Dong Won Lee, Jeong Hun Lee
Summary: Cold-rolled pure titanium showed improved sheet formability after undergoing cryogenic-deformation treatment. This treatment increased the thinning capability of the titanium and suppressed cracking during sheet forming. The formation of twins during deformation contributed to high thinning capability and increased strength through grain refinement and dislocation accumulation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Handong Li, Lin Su, Lijuan Wang, Yanbin Jiang, Jiahui Long, Gaoyong Lin, Zhu Xiao, Yanlin Jia, Zhou Li
Summary: Homogenization heat treatment is a key procedure in controlling the second phase, enhancing composition uniformity, and workability of as-cast Cu-15Ni-8Sn alloy. This study found that electropulsing treatment (EPT) can significantly reduce treatment temperature and time, improve elongation and overall mechanical properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yuxuan Wang, Juntao Zou, Lixing Sun, Yunfei Bai, Zhe Zhang, Junsheng Cheng, Lin Shi, Dazhuo Song, Yihui Jiang, Zhiwei Zhang
Summary: A novel mechanical-heat-electricity synergistic method was proposed to enhance the mechanical properties of Cu-15Sn-0.3Ti alloy by forming annealing twins (ATs). The combination method of Rotary swaging (RS) and Electric pulse treatment (EPT) successfully induced recrystallization and refinement of the microstructure, leading to a significant increase in the strength of the alloy within a short time.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Zhiyi Ding, Jiangtao Xie, Tong Wang, Aiying Chen, Bin Gan, Jinchao Song
Summary: This study demonstrated the Ta-induced strengthening of CoCrNi-AlTi MEAs using nanoscale heterogeneous coherent precipitates. The addition of Ta and aging treatments significantly enhanced the mechanical properties of the alloy, including yield strength, ultimate tensile strength, and elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Z. Y. You, Z. Y. Tang, B. Wang, H. W. Zhang, P. Li, L. Zhao, F. B. Chu, H. Ding
Summary: The mechanical properties and microstructural evolution of C-doped TRIP-assisted HEA under dynamic loading conditions were systematically investigated in this study. The results showed that dynamic tensile deformation led to an increase in yield strength and a decrease in ultimate tensile strength, with a trend towards increased total elongation. The primary deformation mechanisms shifted from TRIP and TWIP effects to deformation twinning and dislocations. The presence of carbides formed through C-doping hindered dislocation slip and promoted the activation of multiple twinning systems.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Feng Qin, Feihu Chen, Junhua Hou, Wenjun Lu, Shaohua Chen, Jianjun Li
Summary: Plastic instability in strong multilayered composites is completely suppressed by architecting nanoscale BCC Nb crystalline-amorphous CuNb interfaces.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)