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Dual inhibition mechanism of core-shell coatings on CL-20 and HMX crystals for suppressing co-crystallization in composite propellants 核壳复合涂层对CL-20和HMX晶体抑制共结晶的双重抑制机理
IF 7.9 2区 材料科学
Materials & Design Pub Date : 2025-08-28 DOI: 10.1016/j.matdes.2025.114651
Pangangjing Zou , Shiliang Huang , Haobin Zhang , Shichun Li , Jie Li , Yu Liu , Liangbin Li , Jinjiang Xu
{"title":"Dual inhibition mechanism of core-shell coatings on CL-20 and HMX crystals for suppressing co-crystallization in composite propellants","authors":"Pangangjing Zou ,&nbsp;Shiliang Huang ,&nbsp;Haobin Zhang ,&nbsp;Shichun Li ,&nbsp;Jie Li ,&nbsp;Yu Liu ,&nbsp;Liangbin Li ,&nbsp;Jinjiang Xu","doi":"10.1016/j.matdes.2025.114651","DOIUrl":"10.1016/j.matdes.2025.114651","url":null,"abstract":"<div><div>The unintended co-crystallization of hexanitrohexaazaisowurtzitane (CL-20) and cyclotetramethylene tetranitramine (HMX) compromises the structural integrity and safety of composite propellants during long-term storage. Inspired by pharmaceutical crystallization control, this study proposes a colloidal interface engineering strategy that utilizes conformal polyvinylpyrrolidone (PVP) coatings on CL-20 and HMX crystals by freeze-drying. The coatings strategy exhibit “sacrificial dissolution” and “physical barrier” dual inhibition mechanism. PVP preferentially saturates the glycidyl azide polymer (GAP) binder through controlled dissolution, deactivating the capacity to dissolve CL-20 and HMX. Simultaneously, PVP forms a dense barrier against plasticizer dioctyl sebacate (DOS) penetration. Molecular dynamics simulations and density functional theory calculations confirmed superior PVP binding affinity to CL-20 and HMX surfaces, which is validated by X-ray photoelectron spectroscopy and atomic force microscopy. Accelerated aging tests (70 °C/30 days) demonstrated complete co-crystallization suppression in PVP-coated formulations. Thermal analysis revealed a 20-30°C increase in phase transition temperatures and enhanced activation energies, attributed to restricted molecular mobility and optimized heat dissipation. Mechanical sensitivity decreased by 50–100 %, while combustion rates increased by 18–33 %. This work bridges pharmaceutical-inspired interfacial control with energetic materials, establishing a universal methodology for stabilizing high-energy composites through kinetic control.</div></div>","PeriodicalId":383,"journal":{"name":"Materials & Design","volume":"258 ","pages":"Article 114651"},"PeriodicalIF":7.9,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144921350","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
Laser-based directed energy deposition with mullite: A necessary step for lunar regolith printing 莫来石激光定向能沉积:月球风化层印刷的必要步骤
IF 7.9 2区 材料科学
Materials & Design Pub Date : 2025-08-28 DOI: 10.1016/j.matdes.2025.114605
Ana Luisa C. de Lucena , Navid Ranjbar , Saeed Khademzadeh , Mohamad Bayat
{"title":"Laser-based directed energy deposition with mullite: A necessary step for lunar regolith printing","authors":"Ana Luisa C. de Lucena ,&nbsp;Navid Ranjbar ,&nbsp;Saeed Khademzadeh ,&nbsp;Mohamad Bayat","doi":"10.1016/j.matdes.2025.114605","DOIUrl":"10.1016/j.matdes.2025.114605","url":null,"abstract":"<div><div>Additive manufacturing (AM) is pivotal in advancing in-situ resource utilization (ISRU) technologies for space exploration, enabling the construction of lunar infrastructure directly from local materials such as lunar regolith. Among the various AM techniques, laser-based directed energy deposition (DED-LB) offers scalability and binder-free processing, making it highly suitable for fabricating large-scale components on the Moon. However, the limited availability of actual lunar regolith necessitates the use of simulants. Mullite, an aluminosilicate ceramic with a chemical composition closely resembling that of highland lunar regolith, is a promising candidate. In this study, synthetic mullite with a spherical morphology was employed as a model feedstock to investigate the feasibility of fabricating multilayer 3D printed components using the DED-LB process. The high thermal stability and round particle morphology of mullite make it an ideal proof-of-concept material to understand the thermal and mechanical challenges associated with lunar regolith printing. A combination of in-situ thermal monitoring and microstructural characterization was used to define optimal process parameters and assess print quality. The results demonstrate the suitability of mullite for DED-LB and contribute to the development of scalable AM processes for future lunar infrastructure.</div></div>","PeriodicalId":383,"journal":{"name":"Materials & Design","volume":"258 ","pages":"Article 114605"},"PeriodicalIF":7.9,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144913892","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
Effects of heat treatment on powder surface conditions and rheological behavior of Ti alloy powders 热处理对钛合金粉末表面状况及流变行为的影响
IF 7.9 2区 材料科学
Materials & Design Pub Date : 2025-08-28 DOI: 10.1016/j.matdes.2025.114644
Naoki Kakegawa, Shion Nanaumi, Weiwei Zhou, Naoyuki Nomura
{"title":"Effects of heat treatment on powder surface conditions and rheological behavior of Ti alloy powders","authors":"Naoki Kakegawa,&nbsp;Shion Nanaumi,&nbsp;Weiwei Zhou,&nbsp;Naoyuki Nomura","doi":"10.1016/j.matdes.2025.114644","DOIUrl":"10.1016/j.matdes.2025.114644","url":null,"abstract":"<div><div>The flowability of feedstock powders is crucial for producing reliable metallic parts using laser powder bed fusion (L-PBF). However, the effects of the powder properties on the powder rheology remain poorly understood because of the complexity of the contributing factors. In this paper, a facile heat treatment approach is proposed to modify the surface conditions of Ti-6Al-4 V alloy powders without altering their particle size or morphology. This “clean powder system” enables a direct investigation of the relationship between the surface conditions and powder flowability, minimizing interference from other variables. Specifically, Ti-6Al-4 V alloy powders intentionally oxidized in air at the processing temperatures of 573 and 773 K were referred to as Ti64-573 and Ti64-773, respectively. Microstructural observations revealed that an amorphous layer with a higher oxygen content was formed on the surface of the Ti64-573 powder, whereas a crystalline layer containing alumina nanostructures was formed on the surface of the Ti64-773 powder. Consequently, the Ti64-773 powder exhibited the highest band gap (3.2 eV), which contributed to the reduced cohesive strength and, in turn, improved the powder bed packing owing to the presence of fewer hydroxyl groups and hydrogen bonds.</div></div>","PeriodicalId":383,"journal":{"name":"Materials & Design","volume":"258 ","pages":"Article 114644"},"PeriodicalIF":7.9,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144921343","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
Microstructural and performance evolution of solidified aluminum under permanent magnet stirring 永磁体搅拌下凝固铝的组织与性能演变
IF 7.9 2区 材料科学
Materials & Design Pub Date : 2025-08-27 DOI: 10.1016/j.matdes.2025.114648
Jing Zou , Chuang Yu , Haitao Zhang , Zibin Wu , Dongtao Wang , Hiromi Nagaumi
{"title":"Microstructural and performance evolution of solidified aluminum under permanent magnet stirring","authors":"Jing Zou ,&nbsp;Chuang Yu ,&nbsp;Haitao Zhang ,&nbsp;Zibin Wu ,&nbsp;Dongtao Wang ,&nbsp;Hiromi Nagaumi","doi":"10.1016/j.matdes.2025.114648","DOIUrl":"10.1016/j.matdes.2025.114648","url":null,"abstract":"<div><div>The technological progress of permanent magnet stirring (PMS) is of great significance for solidified aluminum grain refinement. A comparative study has been carried out to explore the microstructural and performance evolution of solidified aluminum with three purity grades under various rotating magnetic field (RMF) schemes induced by PMS. The experimental results suggest that the use of RMFs can produce fine and homogeneous equiaxed grain structures of solidified aluminum, and the influence of RMFs on grain refinement strongly depends on the purity level of solidified aluminum. The tendency changes of hardness and electrical conductivity are highly correlated with that of grain size. Moreover, the reasons have also been discussed to explain the effect of PMS on the microstructural evolution of solidified aluminum.</div></div>","PeriodicalId":383,"journal":{"name":"Materials & Design","volume":"258 ","pages":"Article 114648"},"PeriodicalIF":7.9,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144917143","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
Improving crack reduction by tailoring minor element content in γ/γ′ cobalt-based superalloys processed by directed energy deposition 定向能沉积γ/γ′钴基高温合金中微量元素含量的调整提高了裂纹的止裂性
IF 7.9 2区 材料科学
Materials & Design Pub Date : 2025-08-27 DOI: 10.1016/j.matdes.2025.114636
Thibaut Froeliger, Sabrina Ghanes, Nicolas Horezan, Louise Toualbi, Didier Locq
{"title":"Improving crack reduction by tailoring minor element content in γ/γ′ cobalt-based superalloys processed by directed energy deposition","authors":"Thibaut Froeliger,&nbsp;Sabrina Ghanes,&nbsp;Nicolas Horezan,&nbsp;Louise Toualbi,&nbsp;Didier Locq","doi":"10.1016/j.matdes.2025.114636","DOIUrl":"10.1016/j.matdes.2025.114636","url":null,"abstract":"<div><div>This study investigates the possibility of manufacturing γ/γ′ cobalt-based superalloys by Directed Energy Deposition (DED). Due to their complex chemical composition, these alloys are highly sensitive to liquid phase cracking mechanisms, particularly at high-angle grain boundaries. The cracking sensitivity of two alloys is investigated in relation to chemical modifications of minor elements and changes in process parameters. Four different parameter sets are employed, resulting in four distinct microstructures. Regardless of the process parameters, changes in minor elements such as boron, zirconium, and silicon significantly influence the cracking sensitivity of the alloys. Reducing their content leads directly to an improvement in the as-built material’s health due to an increase in the solidification temperature of the final liquid pocket. The role of grain boundary density and length is also emphasized in regard to the cracking response of the samples. Increasing the density of high-angle grain boundaries allows for a better distribution of solutes and stresses across multiple interfaces. However, the reduction in cracking is less pronounced with changes in process parameters than with reductions in minor element content. This work highlights the importance of tailoring minor element content for additive manufacturing and provides guidance for the design of new alloys.</div></div>","PeriodicalId":383,"journal":{"name":"Materials & Design","volume":"258 ","pages":"Article 114636"},"PeriodicalIF":7.9,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144907183","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
Deformation mechanism of multi-DoF formed AZ91 alloy with heterogeneous microstructure 多自由度非均匀组织AZ91合金的变形机理
IF 7.9 2区 材料科学
Materials & Design Pub Date : 2025-08-27 DOI: 10.1016/j.matdes.2025.114646
Fang Chai , Jianqiang Feng , Xinghui Han , Xuan Hu , Yonggui Wang , Zushen Deng , Lin Hua
{"title":"Deformation mechanism of multi-DoF formed AZ91 alloy with heterogeneous microstructure","authors":"Fang Chai ,&nbsp;Jianqiang Feng ,&nbsp;Xinghui Han ,&nbsp;Xuan Hu ,&nbsp;Yonggui Wang ,&nbsp;Zushen Deng ,&nbsp;Lin Hua","doi":"10.1016/j.matdes.2025.114646","DOIUrl":"10.1016/j.matdes.2025.114646","url":null,"abstract":"<div><div>Strength-ductility trade-off is a prominent problem that severely limits application of magnesium alloys, which has been effectively solved by introduction of heterogeneous microstructure. However, deformation mechanisms responsible for strength-ductility synergy remain unclear. Herein, multi-degrees of freedom (multi-DoF) formed AZ91 alloy with heterogeneous microstructure, exhibiting extraordinary strength-ductility synergy, was deformed to intermediate strains of 3%, 6%, 9%, 12% and 15% and failure strain at 18%. With tensile strains increasing, both small and large grains in heterogeneous microstructure exhibit progressive coarsening, with the proportion of small grains decreasing and that of large grains increasing. Nevertheless, the microstructure retains heterogeneous during the whole tensile deformation. Initially multi-DoF formed AZ91 alloy is characterized by a dominant prismatic texture, some pyramid texture and little basal texture. The familiar basal texture which is generally formed during room-temperature deformation is not generated. Instead, texture transformation occurs only between prismatic and prismatic textures, primarily due to the activation of non-basal slips. Overall, prismatic texture remains predominant, with its area fraction ranging from 81.5% to 90.1% across all strain levels. The ever-present heterogeneous microstructure and activation of non-basal slips co-contribute strength-ductility coordination improvement in the multi-DoF formed AZ91 alloy.</div></div>","PeriodicalId":383,"journal":{"name":"Materials & Design","volume":"258 ","pages":"Article 114646"},"PeriodicalIF":7.9,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144916602","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
Tool steels and their additive manufacturing for fabrication and repair via PBF and DED processes: techniques, challenges, and applications 通过PBF和DED工艺制造和修复的工具钢及其增材制造:技术,挑战和应用
IF 7.9 2区 材料科学
Materials & Design Pub Date : 2025-08-27 DOI: 10.1016/j.matdes.2025.114639
Mohammad Saleh Kenevisi , Federico Simone Gobber , Paolo Fino , Mariangela Lombardi , Federica Bondioli , Sara Biamino , Daniele Ugues
{"title":"Tool steels and their additive manufacturing for fabrication and repair via PBF and DED processes: techniques, challenges, and applications","authors":"Mohammad Saleh Kenevisi ,&nbsp;Federico Simone Gobber ,&nbsp;Paolo Fino ,&nbsp;Mariangela Lombardi ,&nbsp;Federica Bondioli ,&nbsp;Sara Biamino ,&nbsp;Daniele Ugues","doi":"10.1016/j.matdes.2025.114639","DOIUrl":"10.1016/j.matdes.2025.114639","url":null,"abstract":"<div><div>This review investigates the state of additive manufacturing (AM) of tool steels with a clear, process-aware scope that centers on two dominant AM routes, direct energy deposition (DED) and powder bed fusion (PBF), and their respective roles in fabrication and repair. First, different categories of tool steels and their common damage mechanisms are introduced. The distinct process mechanisms, material responses, and performance metrics characteristic of each technique is outlined, and then how microstructure, residual stresses, porosity, and carbide chemistry emerge under DED and PBF processes for different type of alloys are explained. By contrasting process-specific challenges, such as larger melt pools and intrinsic tempering in DED versus rapid solidification and fine microstructures in PBF, with end-use requirements, e.g. wear resistance, toughness, and reliability in tooling, we reveal common optimization approaches, preheating strategies, parameter windows, post-processing heat treatments, and robust non-destructive evaluation are delineated in this work. The review also assesses the material compatibility, challenges, and economic and environmental considerations of AM tooling, and highlights gaps where cross-process insights can accelerate industrial adoption and discussed future trends. The aim is to provide a coherent, process-aware framework that connects AM physics, materials science, and engineering performance for tool steels.</div></div>","PeriodicalId":383,"journal":{"name":"Materials & Design","volume":"258 ","pages":"Article 114639"},"PeriodicalIF":7.9,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144907185","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 and thermal responses of random triply periodic minimal surface structures 随机三周期最小表面结构的力学和热响应
IF 7.9 2区 材料科学
Materials & Design Pub Date : 2025-08-27 DOI: 10.1016/j.matdes.2025.114638
Maytawee Maneein , Thanakit Yuthchaiming , Chutima Pankul , Atikom Sombatmai , Teerapong Poltue , Vikram Ahuja , Raj Das , Patcharapit Promoppatum
{"title":"Mechanical and thermal responses of random triply periodic minimal surface structures","authors":"Maytawee Maneein ,&nbsp;Thanakit Yuthchaiming ,&nbsp;Chutima Pankul ,&nbsp;Atikom Sombatmai ,&nbsp;Teerapong Poltue ,&nbsp;Vikram Ahuja ,&nbsp;Raj Das ,&nbsp;Patcharapit Promoppatum","doi":"10.1016/j.matdes.2025.114638","DOIUrl":"10.1016/j.matdes.2025.114638","url":null,"abstract":"<div><div>This study investigates the mechanical and thermal responses of stochastic Triply Periodic Minimal Surface (TPMS) structures fabricated using the laser powder bed fusion process with Ti-6Al-4V. Stochastic Gyroid structures were generated by introducing Voronoi-based randomness, allowing for controlled variations in stochasticity. Mechanical behavior was evaluated through finite element (FE) simulations with damage modeling and compressive testing, while thermal performance was analyzed using steady-state finite element modeling with periodic boundary conditions. Experimental and FE results demonstrated that increasing stochasticity alters failure mechanisms by dispersing deformation across sub-domains, reducing macroscopic shear band formation. Among stochastic structures, greater randomness from 5 to 50 random points led to an increase in elastic modulus, initial peak stress, and energy absorption by 38 %, 27 %, and 54 %, respectively. Additionally, while uniform TPMS structures exhibited higher effective thermal conductivity, aligning with the upper limit of Maxwell-Eucken’s models, stochasticity reduced effective thermal conductivity by approximately 8–16 %. Overall, although uniform Gyroid structures exhibited superior mechanical and thermal performance across all evaluated properties, these findings provide new insights into the trade-offs between mechanical resilience and thermal transport in stochastic TPMS architectures, highlighting their potential for multi-functional applications in automotive components, aerospace structures, and structural energy storage systems.</div></div>","PeriodicalId":383,"journal":{"name":"Materials & Design","volume":"258 ","pages":"Article 114638"},"PeriodicalIF":7.9,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144917142","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
Beyond static scaffolds: glucose-responsive hydrogels as dynamic intelligent platform for tissue engineering 超越静态支架:葡萄糖反应水凝胶作为组织工程的动态智能平台
IF 7.9 2区 材料科学
Materials & Design Pub Date : 2025-08-27 DOI: 10.1016/j.matdes.2025.114635
Jiaqi Ma , Jiayin Feng , Xiaofen Zhang , Zheyu Zou , Qiujie Li , Lanjie Lei , Zhen-Zhen Dong , Zhengjie Lin
{"title":"Beyond static scaffolds: glucose-responsive hydrogels as dynamic intelligent platform for tissue engineering","authors":"Jiaqi Ma ,&nbsp;Jiayin Feng ,&nbsp;Xiaofen Zhang ,&nbsp;Zheyu Zou ,&nbsp;Qiujie Li ,&nbsp;Lanjie Lei ,&nbsp;Zhen-Zhen Dong ,&nbsp;Zhengjie Lin","doi":"10.1016/j.matdes.2025.114635","DOIUrl":"10.1016/j.matdes.2025.114635","url":null,"abstract":"<div><div>As a core field of regenerative medicine, tissue engineering seeks to restore or replace damaged tissues by integrating cells, biomaterials, and bioactive molecules. However, simulating the dynamic physiological microenvironment of natural tissues is difficult using traditional scaffold materials, limiting their application. The emergence of smart materials, particularly glucose-responsive hydrogels, has provided a new approach for addressing this issue. Glucose-responsive hydrogels can dynamically modulate their structural and functional characteristics in response to ambient glucose levels, achieving precise drug release, tissue repair, and regeneration, thus promoting the development of tissue engineering technology. This review systematically categorizes glucose-responsive hydrogel materials, encompassing natural materials, synthetic polymers, and nanomaterials. Their biocompatibility, adjustable mechanical properties, and multifunctional properties have also been emphasized. Characterization methods, including mechanical properties and response characteristics, are systematically summarized. Key response mechanisms involving the glucose oxidase, lectin, phenylboronic acid, and cyclodextrin systems are analyzed in detail. These mechanisms enable the intelligent regulation of material properties by specifically recognizing glucose. Glucose-responsive hydrogels show strong potential for regenerating skin, bone, cartilage, and periodontal tissues, positioning them as innovative tools for regenerative medicine.</div></div>","PeriodicalId":383,"journal":{"name":"Materials & Design","volume":"258 ","pages":"Article 114635"},"PeriodicalIF":7.9,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144916601","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
Excellent mechanical properties of micro-grain nickel-based superalloy by coupling super-gravity fields with layered solidification 超重力场耦合分层凝固制备的微晶镍基高温合金具有优异的力学性能
IF 7.9 2区 材料科学
Materials & Design Pub Date : 2025-08-26 DOI: 10.1016/j.matdes.2025.114637
Minle Liao , Chi Zhang , Guohuai Liu , Zhaodong Wang
{"title":"Excellent mechanical properties of micro-grain nickel-based superalloy by coupling super-gravity fields with layered solidification","authors":"Minle Liao ,&nbsp;Chi Zhang ,&nbsp;Guohuai Liu ,&nbsp;Zhaodong Wang","doi":"10.1016/j.matdes.2025.114637","DOIUrl":"10.1016/j.matdes.2025.114637","url":null,"abstract":"<div><div>A novel method combining super-gravity fields with layered solidification was proposed to optimize the solidification microstructure and mechanical properties of nickel-based superalloys. By using a simple interlayer pause strategy, this approach ensures uniform deposition and rapid solidification of each melt layer, achieving approximately 80 % improvement in grain refinement and a higher equiaxed grain fraction compared to continuous solidification. Under 500G (500 times standard gravity, g) and 10 s interlayer pause, fully micro-grain IN718 alloy was prepared. The grain refinement arises from the sequential activation of following mechanisms in each layer: (1) scouring and remelting of coarse dendrites and enhanced heterogeneous nucleation at interlayer regions; (2) “crystal rain” during initial solidification; (3) enhanced dendritic remelting and nucleation and a (4) thermo-mechanical synergistic dendrite fragmentation mechanism. Further microstructural analysis reveals reduced Laves phases, promoted γ’’ phases precipitation, and a high-density of low-angle grain boundaries (LAGBs). Grain refinement and LAGB evolution enhance strain compatibility and dislocation transmission, thereby improving strength and ductility. These synergistic effects result in excellent tensile strength (1127.8 <span><math><mrow><mo>±</mo></mrow></math></span> 21 MPa) and elongation (22.3 <span><math><mrow><mo>±</mo></mrow></math></span> 1.1 %). This work provides a simple yet effective approach and valuable insights for the preparation of micro-grain as-cast nickel-based superalloys with exceptional mechanical properties.</div></div>","PeriodicalId":383,"journal":{"name":"Materials & Design","volume":"258 ","pages":"Article 114637"},"PeriodicalIF":7.9,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144907180","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
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