International Journal of Refractory Metals & Hard Materials最新文献_第7页

Investigation of microstructural evolution and property optimization of pure tungsten via powder extrusion 3D printing 通过粉末挤压 3D 打印研究纯钨的微结构演变和性能优化

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-02-10 DOI: 10.1016/j.ijrmhm.2025.107088

Lijun Jiang , Yong Liu , Shuailong Zhang , Ji Zhang , Wentao Liu , Huichao Cheng

{"title":"Investigation of microstructural evolution and property optimization of pure tungsten via powder extrusion 3D printing","authors":"Lijun Jiang , Yong Liu , Shuailong Zhang , Ji Zhang , Wentao Liu , Huichao Cheng","doi":"10.1016/j.ijrmhm.2025.107088","DOIUrl":"10.1016/j.ijrmhm.2025.107088","url":null,"abstract":"<div><div>Powder extrusion printing (PEP) of tungsten addresses the limitations of residual stress cracking and the high costs associated with direct 3D printing of powder materials. It shows significant potential for producing tungsten products with complex geometries. In this study, green parts made from fine and medium-sized tungsten powders were fabricated using PEP, followed by solvent-thermal debinding and vacuum sintering to create samples with varying densities. The rheological behavior of both feedstock, process parameters affecting print quality, solvent debinding, and microstructural evolution during sintering were investigated. The results indicate that the viscosity of fine tungsten powder feedstock is higher and more sensitive to temperature changes. Key factors influencing print quality include layer thickness, nozzle diameter, and printing speed. Solvent debinding progresses from the sample's edge towards its center, with the debinding rate primarily governed by solute dissolution and diffusion. After sintering at 1750 °C, the relative density of medium-sized tungsten powder reached only 74.0 %, whereas the fine powder achieved a density of 96.8 %. These findings confirm that extrusion 3D printing, combined with sintering, is an effective method for producing high-density tungsten parts with intricate shapes.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"128 ","pages":"Article 107088"},"PeriodicalIF":4.2,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420935","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

Enhanced ductility in proton-irradiated deformed molybdenum – Gaining insights from experiments and molecular dynamics simulations

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-02-04 DOI: 10.1016/j.ijrmhm.2025.107090

Uttiyoarnab Saha , Santu Dey , Chethan Konkati , Apu Sarkar , Subarna Datta , Argha Dutta , Soumita Chakraborty , Ankur Chauhan , N. Gayathri , P. Mukherjee

{"title":"Enhanced ductility in proton-irradiated deformed molybdenum – Gaining insights from experiments and molecular dynamics simulations","authors":"Uttiyoarnab Saha , Santu Dey , Chethan Konkati , Apu Sarkar , Subarna Datta , Argha Dutta , Soumita Chakraborty , Ankur Chauhan , N. Gayathri , P. Mukherjee","doi":"10.1016/j.ijrmhm.2025.107090","DOIUrl":"10.1016/j.ijrmhm.2025.107090","url":null,"abstract":"<div><div>This study investigates the effects of 7 MeV proton irradiation on the microstructure and mechanical properties of deformed molybdenum (Mo) through a combination of experimental techniques and molecular dynamics simulations. Microstructural characterization via X-ray Diffraction Line Profile Analysis (XRDLPA) revealed high microstrain and dislocation density in unirradiated samples, which decreased and eventually saturated with irradiation. Residual resistivity measurements indicated the formation of irradiation-induced defects that reduced the electron mean free path. Transmission Electron Microscopy (TEM) confirmed the presence of a deformed microstructure in the unirradiated state and revealed the formation and growth of dislocation loops with increasing irradiation dose. Tensile testing showed enhanced yield stress and plasticity in irradiated samples, with fracture surface analysis indicating a transition towards ductile fracture at higher doses. Molecular dynamics simulations corroborated the experimental findings, showing defect saturation at high doses and the formation of ½〈111〉 dislocations, predominantly of edge character. Enhanced ductility in irradiated pre-deformed samples was attributed to the ability of these dislocations and their segments to sustain efficient slip processes. This comprehensive study provides new insights into the dynamic interplay between irradiation-induced defects and mechanical behaviour in deformed Mo, with implications for its use in radiation environments.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"128 ","pages":"Article 107090"},"PeriodicalIF":4.2,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143326021","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

High-pressure infiltration fabrication of WC-based self-lubricating ceramics with synergistic enhancement of mechanical and lubrication properties

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-02-02 DOI: 10.1016/j.ijrmhm.2025.107089

ZhiCai Zhang , JiaKun Wu , Chao Wang , ZhiQiang Hou , Yao Tang , Hao Li , Jiao Yang , Jun Gao , YiKan Yang , YangBin Liu , XiaoPing Ouyang , HaiKuo Wang

{"title":"High-pressure infiltration fabrication of WC-based self-lubricating ceramics with synergistic enhancement of mechanical and lubrication properties","authors":"ZhiCai Zhang , JiaKun Wu , Chao Wang , ZhiQiang Hou , Yao Tang , Hao Li , Jiao Yang , Jun Gao , YiKan Yang , YangBin Liu , XiaoPing Ouyang , HaiKuo Wang","doi":"10.1016/j.ijrmhm.2025.107089","DOIUrl":"10.1016/j.ijrmhm.2025.107089","url":null,"abstract":"<div><div>The mechanical performance defects of self-lubricating ceramics bottleneck restricting their development and application. Such a defect is attributed to the lubricant's hindering effect on the substrate's bonding during the sintering process. Here, we report a high-pressure infiltration scheme and present a two-step approach for preparing WC-based self-lubricating ceramics with excellent mechanical and lubrication properties. We have demonstrated that the process breaks through the limitations between mechanical and lubrication properties to improve the wear resistance of the ceramics significantly. The effects of residual stresses due to lubricating phases and the complex three-dimensional pore structure within the ceramics deserve extensive discussion. A multiple lubrication mechanism involving multiple particles is proposed based on frictional wear analysis. This straightforward strategy opens a gate to developing the next generation of self-lubricating ceramic materials.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"128 ","pages":"Article 107089"},"PeriodicalIF":4.2,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143326106","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

Wear mechanisms and its effect of CBN tool on surface roughness in machining of metallic glass 加工金属玻璃时 CBN 工具的磨损机理及其对表面粗糙度的影响

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-02-01 DOI: 10.1016/j.ijrmhm.2025.107082

Wenbin He , Yaoxuan Guo , Dingkun Wang , Wuyi Ming , Guoyong Ye , Xiaoke Li , Yongqiang Wang , Jinguang Du

{"title":"Wear mechanisms and its effect of CBN tool on surface roughness in machining of metallic glass","authors":"Wenbin He , Yaoxuan Guo , Dingkun Wang , Wuyi Ming , Guoyong Ye , Xiaoke Li , Yongqiang Wang , Jinguang Du","doi":"10.1016/j.ijrmhm.2025.107082","DOIUrl":"10.1016/j.ijrmhm.2025.107082","url":null,"abstract":"<div><div>Metallic glass is widely used owing to its excellent properties such as high strength, high hardness, and high elastic limit. Due to its challenging machining characteristics, analyzing tool wear during the machining process is of great significance for broader application. This paper presents an experimental study on the wear behavior and performance characteristics of CBN tools with a negative chamfering structure when cutting Vit1 under different cutting conditions. The analysis explored the impact of cutting parameters on the tool wear process. It shows that the cutting parameters affected the tool-wear stages. Under high cutting parameters, the tool bypasses the normal wear stage and transitions directly to the rapid wear phase. The rake face exhibits cratering and fine chipping, whereas the flank face displays normal wear bands and groove wear. The wear mechanisms of the CBN tools when cutting Vit1 include abrasive, diffusion, oxidation, and adhesive wear. These types of wear are caused by several mechanisms. The machined surface roughness is influenced not only by the increased tool wear but also by the surface quality of the wear zone on the flank face and chip adhesion.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"128 ","pages":"Article 107082"},"PeriodicalIF":4.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420933","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 insights and performance evaluation of low-damage brazed diamond wire with a tungsten core

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-02-01 DOI: 10.1016/j.ijrmhm.2025.107081

Hao Yang , Hui Huang , Xinjiang Liao , Zhiyuan Lai , Nian Duan , Zhiteng Xu

{"title":"Microstructural insights and performance evaluation of low-damage brazed diamond wire with a tungsten core","authors":"Hao Yang , Hui Huang , Xinjiang Liao , Zhiyuan Lai , Nian Duan , Zhiteng Xu","doi":"10.1016/j.ijrmhm.2025.107081","DOIUrl":"10.1016/j.ijrmhm.2025.107081","url":null,"abstract":"<div><div>Silicon nitride (Si<sub>3</sub>N<sub>4</sub>) substrate is an essential component for the next generation of high-power semiconductor devices due to its relatively high thermal conductivity and excellent mechanical strength. Diamond wire slicing is a critical step in producing Si<sub>3</sub>N<sub>4</sub> ceramic substrates. In recent years, high-performance diamond wire is badly needed for the large-scale production of Si<sub>3</sub>N<sub>4</sub> ceramic substrates to address the challenges of processing quality consistency caused by tool wear. This work aims to develop a low-damage brazed diamond wire (BWD) with a tungsten core and systematically investigate its slicing performance on the slicing efficiency, slicing force, wire bow angle, wear characteristics, and sliced surface morphologies in the slicing of Si<sub>3</sub>N<sub>4</sub> ceramic substrate. Experimental results indicate the brazed diamond wire with tungsten core was found to produce higher slicing efficiency, lower sawing force, smaller wire bow angle, and better wear resistance, in comparison to the electroplated diamond wire (EWD). Almost no diamond grain fell off from the brazed diamond wire after slicing, which was attributed to the strong interfacial chemical bonding between diamond grains and brazed alloys. Exposed and sharper grains enhanced the efficiency of brazed diamond wire but produced a rougher surface than nickel-coated electroplated diamond wire. The findings in this research provide guidance for the optimization of slicing tools in the mass production of Si<sub>3</sub>N<sub>4</sub> ceramic substrates and serve as a reference for the other case needs for micro-textures surfaces using diamond wire slicing.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"128 ","pages":"Article 107081"},"PeriodicalIF":4.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143174323","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

Effect of interlayers on thermal residual stresses in diamond/MPEA composites predicted by finite element method

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-02-01 DOI: 10.1016/j.ijrmhm.2025.107080

Xuemei Liu , Changyong Yue , Yang Gao , Zhi Zhao , Wei Zhang , Yong Liu , Xiaoyan Song

{"title":"Effect of interlayers on thermal residual stresses in diamond/MPEA composites predicted by finite element method","authors":"Xuemei Liu , Changyong Yue , Yang Gao , Zhi Zhao , Wei Zhang , Yong Liu , Xiaoyan Song","doi":"10.1016/j.ijrmhm.2025.107080","DOIUrl":"10.1016/j.ijrmhm.2025.107080","url":null,"abstract":"<div><div>The thermal residual stresses in diamond/MPEA (multi-principal element alloy) composites with various interlayers were analyzed using finite element method by both macro- and micro-models. Firstly, we investigated the temperature evolution in the composites during the cooling stage of the spark plasma sintering process. Then, the effects of interlayers introduced between the diamond and MPEA on the evolution and distribution of thermal residual stresses within the composites were studied. The simulation results demonstrate that incorporating a metal interlayer can effectively reduce thermal residual stress and elastic strain in the composites through plastic deformation, particularly when utilizing a metal interlayer with reduced yield strength. Comparatively, a carbide interlayer induces a high-level thermal residual stress primarily located in the carbide interlayer itself and the proximate contacting areas in diamond and the binder phase. Particularly, this stress will not decrease the mechanical properties of the composites, since it has a tensile first principal stress parallel to the interfaces formed between the carbide interlayer and metal interlayer, as well as the carbide interlayer and diamond, and a compressive third principal stress perpendicular to those interfaces. Consequently, the diamond composites with both a metal interlayer and a carbide interlayer are expected to exhibit lower levels of residual stress, which protect diamond particles from graphitization, thereby resulting in superior mechanical performance.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"129 ","pages":"Article 107080"},"PeriodicalIF":4.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143473957","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

Cyclic loading of WC-Ni by FEM with a realistic 3D morphology

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-02-01 DOI: 10.1016/j.ijrmhm.2025.107085

L. Degeneve , D. Mari , P.V.S. Machado , E. Jimenez-Piqué

{"title":"Cyclic loading of WC-Ni by FEM with a realistic 3D morphology","authors":"L. Degeneve , D. Mari , P.V.S. Machado , E. Jimenez-Piqué","doi":"10.1016/j.ijrmhm.2025.107085","DOIUrl":"10.1016/j.ijrmhm.2025.107085","url":null,"abstract":"<div><div>A Finite Element Model produced from a real WC-10wt.%Co sample is used to study the mechanical behavior of cemented carbides in compression tests. The model is obtained by slicing the sample by Focused Ion Beam and reconstructing it. This model is used to represent a WC-Ni sample with the same binder fraction, due to the proximity of the two materials in term of microstructure. The WC is defined as elastic, and the Ni phase includes plasticity. The post sintering cooling is simulated, followed by loading-unloading cycles. The results are compared with experimental data obtained by Neutron Diffraction. The residual thermal stresses are in good agreement with the experimental data, showing high tensile stress in the Ni phase and high anisotropy in the spatial distribution of the stress in the WC phase. The observation of the strain in transverse direction in the Ni phase during the first loading-unloading cycle reveals that the Ni phase in the highly constrained WC-Ni structure cannot be represented by a simple elasto-plastic behavior. An alternative solution is proposed to improve the accuracy of the representation of this material.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"128 ","pages":"Article 107085"},"PeriodicalIF":4.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143326022","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}

引用次数: 0

WC coarsening in cemented carbides during sintering. Part II: Mechanisms of the influence of different grain growth inhibitors

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-01-31 DOI: 10.1016/j.ijrmhm.2025.107087

I. Konyashin , N. Nazari , D. Mueller , S. Farag , B. Ries , A. Bondarev , A. Meledin

{"title":"WC coarsening in cemented carbides during sintering. Part II: Mechanisms of the influence of different grain growth inhibitors","authors":"I. Konyashin , N. Nazari , D. Mueller , S. Farag , B. Ries , A. Bondarev , A. Meledin","doi":"10.1016/j.ijrmhm.2025.107087","DOIUrl":"10.1016/j.ijrmhm.2025.107087","url":null,"abstract":"<div><div>It was reported in the literature that the influence of grain growth inhibitors (GGIs) on the WC grain growth during sintering of cemented carbides is related to the formation of complexions at WC/Co interfaces at temperatures of liquid-phase sintering. However, this viewpoint was not confirmed experimentally, as such complexions were found upon cooling after sintering. The influence of different grain growth inhibitors on the kinetics of WC coarsening in WC-10 wt% Co cemented carbides was investigated. The presence of complexions having a thickness of nearly 1 to 3 nm at WC/Co interfaces was established by STEM, EDX and HRTEM as a result of adding VC, Cr<sub>3</sub>C<sub>2</sub> and TaC to WC + Co. WC grains in WC-Co cemented carbides containing Mo<sub>2</sub>C was characterized by the presence of near-surface layers of (W,Mo)C having a thickness of about 100 nm and absence of complexions at the WC/binder interface. The values of activation energies for all the GGIs except for Mo<sub>2</sub>C lie in the range typical for the solid-state diffusion-controlled processes, therefore, the solid-state diffusion of W and C atoms through the nm-thick complexions is presumably a limiting stage of WC coarsening. Considering the activation energy and distribution of heavy elements in the binder for the samples doped with Mo<sub>2</sub>C, one can assume that in the liquid binder containing dissolved W, C and Mo atoms, molybdenum suppresses the diffusion of tungsten atoms. Therefore, the rate of the tungsten atoms' diffusion in the liquid binder is likely to be a limiting stage of WC coarsening.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"128 ","pages":"Article 107087"},"PeriodicalIF":4.2,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143174312","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

Analysis of contact state and fracture mode of WC-10Co/B318 steel joint fabricated by resistance welding

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-01-31 DOI: 10.1016/j.ijrmhm.2025.107083

Lingyu Chen , Chong Zhang , Guoyue Liu , Zhongning Guo

{"title":"Analysis of contact state and fracture mode of WC-10Co/B318 steel joint fabricated by resistance welding","authors":"Lingyu Chen , Chong Zhang , Guoyue Liu , Zhongning Guo","doi":"10.1016/j.ijrmhm.2025.107083","DOIUrl":"10.1016/j.ijrmhm.2025.107083","url":null,"abstract":"<div><div>The dissimilar joining of B318 steel and two shapes (spherical and cylindrical) of WC-10Co pellets was performed using resistance welding for application in bimetal band saw blades. The study investigates the effects of pellet shape on joint characteristics and contact state by analyzing the welding process, dynamic resistance, temperature field, macroscopic and microscopic joint morphology, and fracture mode. The results indicated that the shear force of joints with different shapes initially increases before decreasing as the welding current rises. The welding range for the spherical joint is narrower than that for the cylindrical joint, and no reaction layer is formed at the joint. In contrast, the cylindrical joint exhibits a shear force of 1175.3N at 750 A, representing the highest value among the two shapes across various welding currents. Under this parameter, the thickness of the formed reaction layer of the cylindrical joint is moderate, with no severe element loss, and fractures occur in the steel's heat-affected zone (HAZ). High-speed photography results showed that spherical joints generate heat faster than cylindrical joints. Numerical simulation results indicated that the peak temperature in spherical joints is higher than in cylindrical joints. These differences can be attributed to variations in pellet curvatures of different shapes, leading to different contact states of the workpieces during welding. This affected the heat generation process, the amount of joint deformation, and the elemental migration and metallurgical reactions at the joint interface. Comparing all aspects, the welding performance of the cylindrical joint proves superior to that of the spherical joint.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"128 ","pages":"Article 107083"},"PeriodicalIF":4.2,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143174310","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

Optimal interplay of charge localization, lattice dynamics and slip systems drives structural softening in dilute W alloys with Re additives

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-01-30 DOI: 10.1016/j.ijrmhm.2025.107086

Prince Sharma , William C. Tucker , Ganesh Balasubramanian

{"title":"Optimal interplay of charge localization, lattice dynamics and slip systems drives structural softening in dilute W alloys with Re additives","authors":"Prince Sharma , William C. Tucker , Ganesh Balasubramanian","doi":"10.1016/j.ijrmhm.2025.107086","DOIUrl":"10.1016/j.ijrmhm.2025.107086","url":null,"abstract":"<div><div>Body centered cubic metals, such as tungsten (W), and their alloys exhibit superior mechanical properties such as high tensile strength and hardness, but their limited ductility contributes to brittleness and causes challenges in manufacturing and machining. While the ductilizing effect of Re additives in dilute W alloys is well reported, a fundamental understanding of the variations in elastic properties with temperature as well as the optimal composition that drives the softening mechanism, is warranted. Here we employ a combination of <em>ab initio</em> molecular simulations and experimental characterization to probe the structural softening in dilute W-Re alloys. We reveal that the coupled effect of charge localization around Re atoms and the predominance of softer phonon modes for a W alloy with 3.1 at.% Re results in the lowest values for the elastic moduli. We develop a probabilistic theory based on the likelihood of Re atoms to be located on the 〈111〉 family of slip directions, to explain the optimum fraction of Re that enhances the structural softening in the alloy. In essence, we corroborate that softening is realized through a reduction of intervening and mutually obstructing slip systems, interlinked with the electronic structure and lattice dynamics.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"128 ","pages":"Article 107086"},"PeriodicalIF":4.2,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143174322","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