Materials & Design最新文献_第2页

An investigation of in situ observation and phase transformation mechanism in cyclic heat treatment of post-rolling Ti-44Al-4Nb-1.5Mo-0.1B alloys Ti-44Al-4Nb-1.5Mo-0.1B合金轧制后循环热处理的原位观察及相变机理研究

IF 7.9 2区材料科学

Materials & Design Pub Date : 2025-09-25 DOI: 10.1016/j.matdes.2025.114830

Siyuan Zhang , Haitao Jiang , Jiangping Xin , Yangjie Gao , Chunhui Wang , Zhichao Zhu , Feida Chen , Shiwei Tian

{"title":"An investigation of in situ observation and phase transformation mechanism in cyclic heat treatment of post-rolling Ti-44Al-4Nb-1.5Mo-0.1B alloys","authors":"Siyuan Zhang , Haitao Jiang , Jiangping Xin , Yangjie Gao , Chunhui Wang , Zhichao Zhu , Feida Chen , Shiwei Tian","doi":"10.1016/j.matdes.2025.114830","DOIUrl":"10.1016/j.matdes.2025.114830","url":null,"abstract":"<div><div>TiAl alloys are promising for aerospace structures but limited by poor high-temperature deformability. β-phase solidified TiAl alloys exhibit improved HT formability but suffer β-induced brittleness and coarse lamellae, affecting serviceability. We developed a cyclic heat treatment protocol for Ti-44Al-4Nb-1.5Mo-0.1B alloy sheets that concurrently eliminates β-phase and refines lamellar colonies, achieving β-free full lamellar structure. The cycling process led to β-phase reduction, lamellar colonies coarsening, lamellae orientation fixing, and lamellar spacing was first densified then sparsened. The above phenomena are attributed to two phase transition processes: β → α and α → α<sub>2</sub> + γ. In the β → α stage, only a diffusive phase transformation occurred. Extended cycling alleviated Nb/Mo segregation, raising β-phase lattice constant and lowering its content. The α → α<sub>2</sub> + γ transformation involves martensitic (α → L1<sub>2</sub>) and diffusion (L1<sub>2</sub> → γ) transformation stages. The difference in transformation rates between these two processes during the cyclic heat treatment leads to the residual presence of L1<sub>2</sub> phases within the lamellar colonies. During lamellae formation, the L1<sub>2</sub> phase acts as a “guide”, influencing the extension direction of the lamellae and playing a role in fixing lamellae orientation. This heat treatment resolves the processability-service performance trade-off, advancing TiAl alloys for aerospace engine components.</div></div>","PeriodicalId":383,"journal":{"name":"Materials & Design","volume":"259 ","pages":"Article 114830"},"PeriodicalIF":7.9,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unveiling microstructure evolution and mechanical properties of silicide-strengthened (TiZrHfNb)100-xSix (x = 0, 1, 5, 7, 10 and 15) refractory high-entropy alloys 揭示了硅化物强化（TiZrHfNb）100- x6 （x = 0、1、5、7、10和15）难熔高熵合金的显微组织演变和力学性能

IF 7.9 2区材料科学

Materials & Design Pub Date : 2025-09-24 DOI: 10.1016/j.matdes.2025.114825

Xiaolei Han , Binbin Liu , Shuyi Xie , Cong Zhang , Li Huang , Wei Liu , Huaping Xiong , Feng Ye

{"title":"Unveiling microstructure evolution and mechanical properties of silicide-strengthened (TiZrHfNb)100-xSix (x = 0, 1, 5, 7, 10 and 15) refractory high-entropy alloys","authors":"Xiaolei Han , Binbin Liu , Shuyi Xie , Cong Zhang , Li Huang , Wei Liu , Huaping Xiong , Feng Ye","doi":"10.1016/j.matdes.2025.114825","DOIUrl":"10.1016/j.matdes.2025.114825","url":null,"abstract":"<div><div>The ductile TiZrHfNb refractory high-entropy alloy is selected to form silicide-strengthened (TiZrHfNb)<sub>100-x</sub>Si<sub>x</sub> (x = 0, 1, 5, 7, 10 and 15, in at. %) alloys, and the influence of Si content on the microstructure and mechanical properties was systematically investigated. The solidification microstructure and the type of silicide show strong dependence on Si content from 1 % to 15 %, with the former changing from hypoeutectic to hypereutectic structure, and the latter evolving from M<sub>3</sub>Si-type to tetragonal-M<sub>5</sub>Si<sub>3</sub>-type silicide, and finally to the co-existence of both tetragonal- and hexagonal- M<sub>5</sub>Si<sub>3</sub>-type silicide. The formation of silicide phase enhances the strength both at the ambient and elevated temperatures, and a significant improvement of peak compressive strength from 221.3 MPa to 511.59 MPa at 800℃ was obtained after alloying 15 % Si to the prototype TiZrHfNb alloy. It was found that heterodeformation-induced strengthening, resulting from dislocation pile-ups at phase boundaries, was responsible for the enhancement in the strength. During hot deformation, the flow stress begins to decrease after reaching the peak value due to the presence of the dynamic recovery and dynamic recrystallization, which becomes more pronounced at higher Si content.</div></div>","PeriodicalId":383,"journal":{"name":"Materials & Design","volume":"259 ","pages":"Article 114825"},"PeriodicalIF":7.9,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145156234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing solidification cracking resistance in high-strength Al-Li alloys via strategic light rare earth alloying: An integrated experiment-simulation approach 战略性轻稀土合金化提高高强度铝锂合金的抗凝固开裂性：综合实验模拟方法

IF 7.9 2区材料科学

Materials & Design Pub Date : 2025-09-24 DOI: 10.1016/j.matdes.2025.114826

Youjie Guo , Yihao Wang , Fangzhou Qi , Liang Zhang , Song Pang , Ming Chen , Qi Li , Junmin Zhan , Quande Li , Jiawei Sun , Yuchuan Huang , Bo Ma , Yixiao Wang , Guohua Wu

{"title":"Enhancing solidification cracking resistance in high-strength Al-Li alloys via strategic light rare earth alloying: An integrated experiment-simulation approach","authors":"Youjie Guo , Yihao Wang , Fangzhou Qi , Liang Zhang , Song Pang , Ming Chen , Qi Li , Junmin Zhan , Quande Li , Jiawei Sun , Yuchuan Huang , Bo Ma , Yixiao Wang , Guohua Wu","doi":"10.1016/j.matdes.2025.114826","DOIUrl":"10.1016/j.matdes.2025.114826","url":null,"abstract":"<div><div>Although Al-Li alloys possess advantages of low density and high stiffness, their severe hot cracking susceptibility (HCS) limits practical applications. Herein, we attempted to decrease HCS without sacrificing mechanical performance by replacing Sc with cost-effective light rare earth (LRE) elements. Results showed that the introduction of La, Ce, Nd, and Pr reduces the HCS to half that of the Base alloy due to grain refinement and melt purification. Finite element analysis (FEA) revealed that compared to elongated LRE phases characterized by high aspect ratios and interfacial curvature, blocky LRE phases with lower aspect ratios and interfacial curvature hinder crack propagation, leading to improved cracking resistance. Among the low-HCS variants, Pr-modified alloy shows remarkable yield strength of 398 MPa, exhibiting competitiveness compared to existing Sc-containing alloys. More importantly, Pr-modified alloy achieves a significant cost reduction of ∼27 %. The narrowed δʹ-Al<sub>3</sub>Li precipitation free zone (PFZ) and the uniformly distributed fine T<sub>1</sub> precipitates contribute to the promising mechanical properties of Pr-modified alloy. First-principles calculations indicated that the higher vacancy binding energies of Nd and Pr atoms suppress δʹ-PFZ coarsening, while their doping increases the coarsening energy barrier of T<sub>1</sub> precipitates. These benefits mitigate stress concentration and enhance deformation compatibility.</div></div>","PeriodicalId":383,"journal":{"name":"Materials & Design","volume":"259 ","pages":"Article 114826"},"PeriodicalIF":7.9,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of novel non-periodic biomimetic bone scaffolds using the Moving Morphable Components method 移动可变形构件法设计新型非周期仿生骨支架

IF 7.9 2区材料科学

Materials & Design Pub Date : 2025-09-24 DOI: 10.1016/j.matdes.2025.114815

Hao Wang , Jiongyi Wu , Yuhang Chen , Michael Zhuravkov , Sergei Bosiakov , Youwei Zhang , Mohammed Rafiq Abdul Kadir , Jian Jiang , Yongtao Lyu

{"title":"Design of novel non-periodic biomimetic bone scaffolds using the Moving Morphable Components method","authors":"Hao Wang , Jiongyi Wu , Yuhang Chen , Michael Zhuravkov , Sergei Bosiakov , Youwei Zhang , Mohammed Rafiq Abdul Kadir , Jian Jiang , Yongtao Lyu","doi":"10.1016/j.matdes.2025.114815","DOIUrl":"10.1016/j.matdes.2025.114815","url":null,"abstract":"<div><div>Bone scaffolds are widely used in orthopedics for tissue repair and regeneration, yet achieving optimal bone growth through porous scaffolds remains a significant challenge. In this study, the Moving Morphable Components (MMC) method was employed to design novel non-periodic biomimetic bone scaffolds. Four types of scaffolds were created to mimic different human bone tissues. Their average elastic moduli were evaluated, and found to closely match with those of the corresponding bone tissues. Compared to triply periodic minimal surface (TPMS) structures, the novel scaffolds exhibited significantly higher permeability − up to 3.70 × 10<sup>−8</sup> m<sup>2</sup> at a porosity of 62 %. These scaffolds demonstrated not only suitable mechanical properties but also enhanced permeability. Furthermore, they showed a good manufacturability, making them practical for fabrication. Overall, the MMC-designed scaffolds present a promising solution with matched mechanical properties and superior permeability, potentially reducing stress shielding and promoting bone cell growth and regeneration in tissue engineering applications.</div></div>","PeriodicalId":383,"journal":{"name":"Materials & Design","volume":"259 ","pages":"Article 114815"},"PeriodicalIF":7.9,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flexible thermoelectric energy harvesting devices via aerosol jet printed bismuth telluride (Bi2Te3) nanowires and intense pulsed light sintering 气溶胶喷射印刷碲化铋纳米线和强脉冲光烧结柔性热电能量收集装置

IF 7.9 2区材料科学

Materials & Design Pub Date : 2025-09-24 DOI: 10.1016/j.matdes.2025.114828

Guo Liang Goh , Haisheng Li , Xiang Yun Debbie Soo , Guanbo Chen , Seng Ann Sia , Samantha Faye Duran Solco , Dorsasadat Safanama , Samuel Lee , Yefei Li , Danwei Zhang , Wai Yee Yeong

{"title":"Flexible thermoelectric energy harvesting devices via aerosol jet printed bismuth telluride (Bi2Te3) nanowires and intense pulsed light sintering","authors":"Guo Liang Goh , Haisheng Li , Xiang Yun Debbie Soo , Guanbo Chen , Seng Ann Sia , Samantha Faye Duran Solco , Dorsasadat Safanama , Samuel Lee , Yefei Li , Danwei Zhang , Wai Yee Yeong","doi":"10.1016/j.matdes.2025.114828","DOIUrl":"10.1016/j.matdes.2025.114828","url":null,"abstract":"<div><div>Flexible thermoelectric devices offer great promise in converting waste energy into electrical energy for wearable electronics, soft robotics, and bendable sensor systems. In this work, we report the scalable fabrication of flexible thermoelectric films by aerosol jet printing of Bi<sub>2</sub>Te<sub>3</sub>-based nanowires onto a PLA nanofiber-based substrate, followed by optimized intense pulsed light (IPL) sintering. We optimized atomizer, ink, and sheath flows, as well as print speed, to ensure uniform and precise pattern deposition. Optical and SEM analyses revealed that the as-printed films form an intertwined, agglomerated network. This network is distinct from the aligned nanowires observed in drop-cast samples. The difference likely arises from the high shear forces and rapid solvent evaporation inherent to the aerosol jet process. Subsequent IPL sintering, performed at an optimized sintering distance and number of pulses, effectively densified the films without damaging the underlying PLA nanofiber on the substrate. These enhancements in film morphology and densification are crucial for minimizing interparticle resistance and promoting efficient carrier transport, ultimately boosting the thermoelectric performance. This study demonstrates a promising approach for the fabrication of high-resolution, flexible thermoelectric devices suitable for powering next-generation flexible Internet of things (IoT) devices by tapping on waste heat energy.</div></div>","PeriodicalId":383,"journal":{"name":"Materials & Design","volume":"259 ","pages":"Article 114828"},"PeriodicalIF":7.9,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145156226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical properties evaluation of MMCs via multi-scale nanoindentation and GMM: A case study on induction-cladded in-situ TiC/Ti coatings 基于多尺度纳米压痕和GMM的mmc力学性能评价——以感应包覆原位TiC/Ti涂层为例

IF 7.9 2区材料科学

Materials & Design Pub Date : 2025-09-24 DOI: 10.1016/j.matdes.2025.114819

Jiangtao Gong , Helong Yu , Yanli Yin , Hongmei Wang , Zhe Yang , Xiang Xiao , Haiqing Li

{"title":"Mechanical properties evaluation of MMCs via multi-scale nanoindentation and GMM: A case study on induction-cladded in-situ TiC/Ti coatings","authors":"Jiangtao Gong , Helong Yu , Yanli Yin , Hongmei Wang , Zhe Yang , Xiang Xiao , Haiqing Li","doi":"10.1016/j.matdes.2025.114819","DOIUrl":"10.1016/j.matdes.2025.114819","url":null,"abstract":"<div><div>The inhomogeneous spatial distribution and size effect of multi-scale reinforced phases makes it challenging to characterize and analyze the surface mechanical properties of metal matrix composites (MMCs). Therefore, a multi-scale hybrid nanoindentation testing strategy integrated with the Gaussian mixture model (GMM) was developed to evaluate the surface mechanical properties of induction-cladded in-situ TiC/Ti multi-phase composite coating in this study. The coating consisted of α-Ti, a small amount of β-Ti and a diffusely distributed TiC reinforced phase. The microhardness stabilized at ∼ 600 HV<sub>0.2</sub>, and the TiC phase exhibited a “shallow hard − deep soft” behavior. The mechanical properties of within the TiC region (WTR) were between those of TiC and the matrix phase, and the β-Ti matrix phase exhibited superior performance to that of α-Ti. A correlation model between microhardness and single nanoindentation hardness was constructed using the modified rule of mixtures (ROM) method, revealing the evolution of the phase structure with an increase in the TiC volume fraction. GMM-based decoupling of nanoindentation data indicated that hardness and elastic modulus followed a three-peak Gaussian distribution, corresponding to TiC, WTR, and matrix phases. This study provides a theoretical foundation for the optimization of MMCs properties.</div></div>","PeriodicalId":383,"journal":{"name":"Materials & Design","volume":"259 ","pages":"Article 114819"},"PeriodicalIF":7.9,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145217594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Compressive response of concave negative Poisson’s ratio cylindrical shell/TPMS core composite structures 凹负泊松比圆柱壳/TPMS核心复合结构的压缩响应

IF 7.9 2区材料科学

Materials & Design Pub Date : 2025-09-24 DOI: 10.1016/j.matdes.2025.114827

Junjie Gong , Zhihao Ma , Yuanyuan Wei , Guoqian Song , Wenfeng Hao

{"title":"Compressive response of concave negative Poisson’s ratio cylindrical shell/TPMS core composite structures","authors":"Junjie Gong , Zhihao Ma , Yuanyuan Wei , Guoqian Song , Wenfeng Hao","doi":"10.1016/j.matdes.2025.114827","DOIUrl":"10.1016/j.matdes.2025.114827","url":null,"abstract":"<div><div>Conventional concave cylindrical shells, though lightweight, are prone to early failure under compression due to instability, limiting their energy absorption potential. This study introduces a hybrid shell–core design by integrating three types of concave shells with a Gyroid-based triply periodic minimal surfaces (TPMS) core to form a hierarchical structure that enhances both compressive stability and energy dissipation. Compression tests were conducted to examine mechanical performance and deformation behavior. Results show that alternating positive–negative units (NAP) consist of alternating positive and negative Poisson’s ratio units. Their peak load is ∼ 16 % higher than negative Poisson’s ratio units (NPR) and ∼ 60 % higher than positive ones (PPR), though specific energy absorption (SEA) is reduced.With TPMS integration, the NPR-based composite achieves 47 % improvement in both peak load and SEA, while the NAP composite attains a 63 % SEA increase. The failure modes of the three types of composite structures were different, with the PPR structure producing a peeling of the inner core and outer shell during failure, the NPR structure fracturing due to the extrusion of the inner and outer structures, and the NAP structure maintaining high loads due to the coupling of the first two deformations. This work demonstrates the effectiveness of shell-core synergistic mechanisms in optimizing structural properties and opens new avenues for designing lightweight, impact-resistant protective metamaterials in fields such as aerospace and automotive engineering.</div></div>","PeriodicalId":383,"journal":{"name":"Materials & Design","volume":"259 ","pages":"Article 114827"},"PeriodicalIF":7.9,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A biomimetic bilayer fibrous scaffold for repair of massive rotator cuff tear via minimally invasive delivery 一种仿生双层纤维支架用于微创移植修复大面积肩袖撕裂

IF 7.9 2区材料科学

Materials & Design Pub Date : 2025-09-24 DOI: 10.1016/j.matdes.2025.114821

Zhongfei Zou , Kai Liu , Fangyuan Cai , Xingke Huang , Zhen Shen , Yong He , Li Shen , Yuewei Chen

{"title":"A biomimetic bilayer fibrous scaffold for repair of massive rotator cuff tear via minimally invasive delivery","authors":"Zhongfei Zou , Kai Liu , Fangyuan Cai , Xingke Huang , Zhen Shen , Yong He , Li Shen , Yuewei Chen","doi":"10.1016/j.matdes.2025.114821","DOIUrl":"10.1016/j.matdes.2025.114821","url":null,"abstract":"<div><div>Therapeutic arthroscopy is a common minimally invasive procedure, yet repairing massive rotator cuff tears remains challenging due to difficulties in delivering patches and replicating the complex tendon–bone interface. Herein, a clinical treatment strategy integrating customizable biomimetic structural scaffold with a novel minimally invasive delivery technique is proposed. First, inspired by the collagen fiber network of rotator cuff, a biomimetic bilayer heterogeneous fibrous scaffold was designed and fabricated. The tendon layer combines aligned and crimped fibers to replicate natural tendon collagen and guide tendon cell migration, while the bone repair layer features randomly-oriented crimped fibers to provide osteogenic topological cues. Results demonstrated that crimped (36.17 % porosity, 30-μm pore diameter) and parallel-fibered (50-μm spacing) scaffolds enhanced tendon stem cell adhesion and directional alignment compared to control groups. Second, a specialized minimally invasive delivery system was pioneered to transport a 50 × 30 mm scaffold to the intra-articular target site through a minimal incision (≤10 mm), while preserving structural integrity and spatial orientation. Finally, arthroscopic simulations and implantation experiments validated the efficacy of this minimally invasive delivery strategy. This integrated solution for rotator cuff repair combines structural biomimetics, functional compatibility, and clinical feasibility, demonstrating strong translational potential.</div></div>","PeriodicalId":383,"journal":{"name":"Materials & Design","volume":"259 ","pages":"Article 114821"},"PeriodicalIF":7.9,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145217582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Polyphenol crosslinked carboxymethyl chitosan fibrous membrane for rapid hemostasis and infected wound healing 多酚交联羧甲基壳聚糖纤维膜用于快速止血和感染伤口愈合

IF 7.9 2区材料科学

Materials & Design Pub Date : 2025-09-24 DOI: 10.1016/j.matdes.2025.114824

Feng Rao , Kuan Chen , Zhuo Wan , Ziting Liu , Fang Li , Yi Wang , Zuoying Yuan

{"title":"Polyphenol crosslinked carboxymethyl chitosan fibrous membrane for rapid hemostasis and infected wound healing","authors":"Feng Rao , Kuan Chen , Zhuo Wan , Ziting Liu , Fang Li , Yi Wang , Zuoying Yuan","doi":"10.1016/j.matdes.2025.114824","DOIUrl":"10.1016/j.matdes.2025.114824","url":null,"abstract":"<div><div>Developing advanced hemostatic materials that both facilitate more efficient haemostasis and anti-bacterial wound healing is essential for the treatment of severe trauma. Herein, we present a unique polyphenol crosslinked carboxymethyl chitosan (CMC) fibrous membrane (CMC/TA-FM), which was synthesized by converting commercial chitosan fibrous membranes into CMC and crosslinking them with tannic acid. This design not only enhances hemostatic efficacy but also introduces strong antibacterial and antioxidant capabilities. CMC/TA-FM achieves rapid haemostasis with minimal blood loss in both rat and pig liver injury models, outperforming clinically used hemostatic materials such as CELOX and other CMC-based products. In infected wound models, CMC/TA-FM significantly reduces bacterial load and accelerates wound closure, with results comparable to or even better than antibiotic-loaded gelatin sponges. CMC/TA-FM represents a promising hemostatic material that combines rapid bleeding control with strong antibacterial properties and promotes effective healing of infected wounds, positioning it as a potential next-generation hemostatic wound dressing for emergency trauma and infected wound management.</div></div>","PeriodicalId":383,"journal":{"name":"Materials & Design","volume":"259 ","pages":"Article 114824"},"PeriodicalIF":7.9,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of thermoplastic polyurethane (TPU) as a plasticiser-free binder on additive manufacturing of magnesium alloys: A comparison with polypropylene-polyethylene copolymers 热塑性聚氨酯（TPU）作为无增塑剂粘结剂对镁合金增材制造的影响：与聚丙烯-聚乙烯共聚物的比较

IF 7.9 2区材料科学

Materials & Design Pub Date : 2025-09-23 DOI: 10.1016/j.matdes.2025.114759

Hyeonseok Kim , Tom McKenna , Ramesh Raghavendra , Eoin O’Cearbhaill , Mert Celikin

{"title":"Impact of thermoplastic polyurethane (TPU) as a plasticiser-free binder on additive manufacturing of magnesium alloys: A comparison with polypropylene-polyethylene copolymers","authors":"Hyeonseok Kim , Tom McKenna , Ramesh Raghavendra , Eoin O’Cearbhaill , Mert Celikin","doi":"10.1016/j.matdes.2025.114759","DOIUrl":"10.1016/j.matdes.2025.114759","url":null,"abstract":"<div><div>This study presents a breakthrough in screw-based material extrusion (SBME) of magnesium (Mg) alloys by introducing a plasticiser-free thermoplastic polyurethane (TPU) binder system that achieves a 70 vol% powder loading, the highest reported for material extrusion of any solid material. TPU performance was compared with polypropylene–polyethylene copolymer (PPcoPE), the current state-of-the-art binder for Mg alloys. Unlike conventional multi-component systems, the single-backbone TPU eliminates plasticisers, preventing phase separation and enabling stable extrusion at high powder fractions. The absence of plasticisers also suggests that solvent debinding can be bypassed, saving time, cost, and energy while avoiding solvent reactions with Mg. Rheological analysis revealed a unique viscosity-reduction mechanism in TPU, where powder particles disrupt polymer chain entanglements. This effect improves flow at high loadings, while TPU’s cohesive melting profile ensures uniform extrusion and prevents nozzle clogging, unlike the four-step melting of PPcoPE. Preliminary sintering studies between 500 and 700 °C for up to 64 h showed no densification for both binders, probably due to carbonate and oxide surface layers (detected via EDS, XRD, and OPTIR) on Mg-5Ca after debinding, suggesting a change in Mg alloy composition for higher sinterability. These findings highlight TPU’s potential for record-high powder loadings in next-generation powder-based additive manufacturing.</div></div>","PeriodicalId":383,"journal":{"name":"Materials & Design","volume":"259 ","pages":"Article 114759"},"PeriodicalIF":7.9,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145218018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0