International Journal of Refractory Metals & Hard Materials最新文献_第6页

Spark plasma sintering influence on microstructure and mechanical properties of Ti:Ta/carbonitride ceramic matrix composites

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-02-13 DOI: 10.1016/j.ijrmhm.2025.107094

José Manuel Córdoba Gallego

引用次数: 0

Effects of different post-processing temperatures on the microstructure and mechanical properties of TiC-Ni cermets fabricated by selective laser melting

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-02-13 DOI: 10.1016/j.ijrmhm.2025.107097

Song Huang , Huachen Liu , Liangcai Du , Lichao Gong , Yunqi Xie , Qianqian Kong , Zhenhua Yao

{"title":"Effects of different post-processing temperatures on the microstructure and mechanical properties of TiC-Ni cermets fabricated by selective laser melting","authors":"Song Huang , Huachen Liu , Liangcai Du , Lichao Gong , Yunqi Xie , Qianqian Kong , Zhenhua Yao","doi":"10.1016/j.ijrmhm.2025.107097","DOIUrl":"10.1016/j.ijrmhm.2025.107097","url":null,"abstract":"<div><div>Selective laser melting (SLM) combined with post-processing is a common method for fabricating complex-shaped cermets components. This study utilized SLM-fabricated samples and employed vacuum sintering as a post-processing technique to investigate the effects of different post-processing temperatures (1350 °C, 1375 °C, 1400 °C, 1425 °C, 1450 °C) on the microstructure and mechanical properties of TiC-35 wt% Ni cermets. The results showed that using SLM printing parameters of 240 W laser power and 300 mm/s scanning speed produced well-formed samples. As the sintering temperature increased, the sintering mechanism gradually transitioned from solid-phase sintering to liquid-phase sintering. Relative density, hardness, bending strength, and fracture toughness showed a trend of first increasing and then decreasing. At 1400 °C, peak values were achieved: 97.7 % relative density, 82.7 HRA hardness, 901.8 MPa bending strength, and 8.72 MPa·m<sup>1</sup>/<sup>2</sup> fracture toughness. Beyond this temperature, excessive grain growth and an increase in the brittle Ni<sub>3</sub>Ti phase led to a decline in mechanical properties. Vacuum sintering could be a promising post-processing technique for eliminating SLM-related defects and enhancing mechanical properties.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"128 ","pages":"Article 107097"},"PeriodicalIF":4.2,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420934","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 heat treatment on microstructure and mechanical properties of tungsten heavy alloy with a non-equiatomic Ni5.5Fe2.5CoCr high-entropy binder

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-02-13 DOI: 10.1016/j.ijrmhm.2025.107096

Tongwei Zhang , Longwu Liu , Xue Jiang , Ying Liu , Yong Han

{"title":"Effect of heat treatment on microstructure and mechanical properties of tungsten heavy alloy with a non-equiatomic Ni5.5Fe2.5CoCr high-entropy binder","authors":"Tongwei Zhang , Longwu Liu , Xue Jiang , Ying Liu , Yong Han","doi":"10.1016/j.ijrmhm.2025.107096","DOIUrl":"10.1016/j.ijrmhm.2025.107096","url":null,"abstract":"<div><div>Tungsten heavy alloys (WHAs) hold extensive and promising application prospects in the defense industry as well as the aerospace filed because of their high melting point, high strength, and low thermal expansion coefficient. However, the grain size of WHAs prepared by conventional liquid phase sintering is coarse, which limits the further improvement of their mechanical properties. Designing high-entropy alloys (HEAs) as the binder phase provides a novel way to inhibit tungsten grain coarsening and improve the properties of WHAs due to the hysteresis diffusion effect of HEAs. In our previous research, a fine-grain and ultrahigh-strength WHA with non-equiatomic Ni<sub>5.5</sub>Fe<sub>2.5</sub>CoCr HEA as the binder phase was designed and successfully fabricated through the spark plasma sintering (SPS)method. In this study, vacuum heat treatment was adopted to further enhance the strength - toughness matching performance of the material. A systematic investigation was carried out on the impacts of the heat treatment process on the microstructure and mechanical properties of the 90W-Ni<sub>5.5</sub>Fe<sub>2.5</sub>CoCr alloy. The results show that the single - heat - treatment process exerts little influence on the microstructure and properties of 90 W-Ni<sub>5.5</sub>Fe<sub>2.5</sub>CoCr alloy. In contrast, the two - step heat - treatment process can remarkably optimize the distribution of the precipitated phases within the alloy. This optimization effectively enhances the plasticity of the alloy. Specifically, the fracture elongation can be increased from approximately 10 % to around 16 %. Moreover, it has been discovered that dislocations are predominantly distributed at the interface between the binder phase and the W phase. This distribution pattern is conducive to promoting the plastic - deformation capacity of the alloy.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"128 ","pages":"Article 107096"},"PeriodicalIF":4.2,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420936","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

Photochemical fabrication of metallic composites: Synergize metal growth with interfacial bonding by polymers 金属复合材料的光化学制造：金属生长与聚合物界面结合的协同作用

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-02-13 DOI: 10.1016/j.ijrmhm.2025.107095

Zhi Zhao, Xuan Yao, Chao Hou, Tielong Han, Erqi Yang, Xiaotong Zheng, Xinyu Li, Xiaoyan Song

引用次数: 0

Low-activation joining methods for cWC and RSBs on steel for nuclear applications

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-02-12 DOI: 10.1016/j.ijrmhm.2025.107093

S. Srinivasan, J. Gillham, J. Marshall

{"title":"Low-activation joining methods for cWC and RSBs on steel for nuclear applications","authors":"S. Srinivasan, J. Gillham, J. Marshall","doi":"10.1016/j.ijrmhm.2025.107093","DOIUrl":"10.1016/j.ijrmhm.2025.107093","url":null,"abstract":"<div><div>Cemented tungsten carbides (cWCs) and reactive sintered borides (RSB) are novel radiation-dense materials that are recent candidates as reactor shielding for compact spherical tokamaks (cST). This work investigates the use of pressure-less sinter-fusing methods for joining dissimilar materials for use in activating environments. Pressure-less sinter-fusing shows promise as a relatively non-invasive joining method for dissimilar materials, and it can be performed in an inert atmosphere or under vacuum. Sinter-fusing as a method for joining low-activation cWC and RSB materials to mild steels was investigated using various braze alloy mixtures as a paste and metal foils. A selection of low-activation braze alloys was investigated to join cWC and RSB to steel using sinter-fusing at 1300 °C in Ar for 2 h. Low-activating braze alloys were based on Cu and Fe as the major components with additions including Cr, Zr, Ti, C, B and Si as minor components. SEM-EDX was used to assess the quality of bonding and diffusion of the braze compounds post-sintering. The Vickers hardness mechanical test was carried out for the base materials and the joint interface, and the fracture toughness values were calculated from the hardness data. Results show that both brazing paste and foils have achieved well joints with no cracks and pores, but Cu foil-based joints shown superior to that of brazing paste concerning their mechanical properties.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"129 ","pages":"Article 107093"},"PeriodicalIF":4.2,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453589","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

Variation of microstructure and mechanical properties of NbMoVCr high-entropy alloy coatings doped silicon

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-02-12 DOI: 10.1016/j.ijrmhm.2025.107092

Jian Yang , Shenghui Lu , Jijun Yang

引用次数: 0

Understanding the processability, microstructure, and mechanical properties of molybdenum processed by electron beam powder bed fusion

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-02-11 DOI: 10.1016/j.ijrmhm.2025.107091

Samuele Di Sturco , Giulio Marchese , Federica Bondioli , Mariangela Lombardi , Daniele Ugues , Paolo Fino , Sara Biamino

{"title":"Understanding the processability, microstructure, and mechanical properties of molybdenum processed by electron beam powder bed fusion","authors":"Samuele Di Sturco , Giulio Marchese , Federica Bondioli , Mariangela Lombardi , Daniele Ugues , Paolo Fino , Sara Biamino","doi":"10.1016/j.ijrmhm.2025.107091","DOIUrl":"10.1016/j.ijrmhm.2025.107091","url":null,"abstract":"<div><div>This work aims to develop and characterize molybdenum (Mo) processed by Electron Beam Powder Bed Fusion (EB-PBF). Two Mo powders with different oxygen levels were used to investigate the processability, obtaining crack-free bulk samples. The process parameter optimization resulted in a residual porosity of around 0.15 %, showing that limiting the oxygen played a key role in reducing the formation of pores. The as-fabricated Mo samples displayed columnar grains with lengths of several millimeters along the building direction composed of numerous subgrain structures created by the thermal stresses of the EB-PBF process. Moreover, the high preheating temperature, as well as the remelting combined with high residual stresses, triggered the formation of a few recrystallized grains. The Mo samples were characterized by a strong 〈001〉 crystallographic fiber orientation along the building direction. The microstructure also revealed the formation of a limited quantity of molybdenum oxides along the grain boundaries. Finally, the bending strength, hardness, Young modulus, and coefficient of thermal expansion (CTE) were determined. The Mo processed by EB-PBF presented bending strength superior to the traditional recrystallized Mo, while the Young modulus and CTE were compatible with the traditional processed Mo.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"129 ","pages":"Article 107091"},"PeriodicalIF":4.2,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428082","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

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