International Journal of Refractory Metals & Hard Materials最新文献_第9页

Hardmetals with Ru-containing multi-element binders: Composition, constitution and phase formation 含钌多元素结合剂硬质合金：组成、组成和相形成

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-02-18 DOI: 10.1016/j.ijrmhm.2025.107102

Lena Maria Dorner , Raquel De Oro Calderon , Wolf-Dieter Schubert , Ralph Useldinger

{"title":"Hardmetals with Ru-containing multi-element binders: Composition, constitution and phase formation","authors":"Lena Maria Dorner , Raquel De Oro Calderon , Wolf-Dieter Schubert , Ralph Useldinger","doi":"10.1016/j.ijrmhm.2025.107102","DOIUrl":"10.1016/j.ijrmhm.2025.107102","url":null,"abstract":"<div><div>In spite of the rather high cost of Ru, CoRu binders are commonly used by the industry for the production of cemented carbides with performance demands at high temperatures. In a recent study it was shown that the solubility of W in Co-binders is considerably increased by the addition of Ru (both at low and at high carbon contents), which can significantly affect aspects such as grain growth inhibition, hardness, corrosion resistance and high temperature strength. The present work has extended the study to further binder chemistries: Co, Ni, CoNi and CoNiCr, which have been evaluated both with and without Ru additions. The results indicate that Ru additions increase the solubility of elements like W and Cr for all binder chemistries, both at low and at high carbon contents. The solubility of W is the lowest in the Cr-containing systems (CoNiCr and CoNiCrRu), however, due to the presence of Cr, the total amount of elements in solution is the highest from all binders. The results clearly demonstrate that the WC growth behaviour is significantly affected by the chemistry of the binder system, i.e. the chemical environment of the growing WC grains, which is strongly linked with the chemical activity of carbon in the system.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"129 ","pages":"Article 107102"},"PeriodicalIF":4.2,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143463760","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}

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Compressive performance and defects healing behavior of pure tungsten fabricated by LPBF coupled with subsequent hot isostatic pressing LPBF复合热等静压法制备纯钨的压缩性能和缺陷愈合行为

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-02-17 DOI: 10.1016/j.ijrmhm.2025.107100

Jie Mao , Zichun Wu , Nan Ye , Xiaoqiang Wen , Fan Zhang , Wentan Zhu , Ziyi Gong , Jiancheng Tang

{"title":"Compressive performance and defects healing behavior of pure tungsten fabricated by LPBF coupled with subsequent hot isostatic pressing","authors":"Jie Mao , Zichun Wu , Nan Ye , Xiaoqiang Wen , Fan Zhang , Wentan Zhu , Ziyi Gong , Jiancheng Tang","doi":"10.1016/j.ijrmhm.2025.107100","DOIUrl":"10.1016/j.ijrmhm.2025.107100","url":null,"abstract":"<div><div>Additively manufactured pure tungsten parts are prone to defects such as gas pores, lack of fusions, and cracks, which significantly confines its wider application. Here, the hot isostatic pressing (HIP) treatment was employed to improve the microdefects using high temperature and high pressure conditions. The microstructure evolution and compressive performance were systematically investigated. The results revealed that the HIP treatment contributed to filling the gas pores and lack of fusions, and healing the crack to discontinuous chain-like pores. The grain size ascended with the more concentrated distribution at both views, and the texture orientation evolved towards the 〈101〉 and 〈111〉, accompanied by the weaker 〈001〉. In addition, the LAGBs penetrated the HGABs storing the strain energy required for crack propagation. The compressive performance of additively manufactured pure tungsten was significantly enhanced, with the compressive strength increasing from 944 MPa to 1263 MPa (about 33.8 %) and the compressive strain rising from 11.0 % to 16.0 % (around 45.4 %). These results aid in offering another way to understand the micro defects and heal them of pure tungsten or other refractory metals.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"129 ","pages":"Article 107100"},"PeriodicalIF":4.2,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143453590","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}

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Microstructure, mechanical, electrochemical and tribological performances of WC-based cemented carbides with different NbC amounts 不同NbC用量wc基硬质合金的显微组织、力学、电化学和摩擦学性能

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-02-15 DOI: 10.1016/j.ijrmhm.2025.107099

Yuwei Ye , Baoshan Zhu , Luoyang Zheng , Zhihui Zhou , Yan Xue , Hao Chen , Zhuopeng Tan , Shufang Zhang

{"title":"Microstructure, mechanical, electrochemical and tribological performances of WC-based cemented carbides with different NbC amounts","authors":"Yuwei Ye , Baoshan Zhu , Luoyang Zheng , Zhihui Zhou , Yan Xue , Hao Chen , Zhuopeng Tan , Shufang Zhang","doi":"10.1016/j.ijrmhm.2025.107099","DOIUrl":"10.1016/j.ijrmhm.2025.107099","url":null,"abstract":"<div><div>WC-based cemented carbides with different NbC amounts (0, 1, 2, 3, 4, and 5 wt%) were prepared by the liquid phase sintering method. When the NbC amount was low, it was uniformly distributed in the cemented carbide and reduced the grain size of WC grains. With the increase of NbC amount, the inhibitory effect of WC grain was weakened, and the (Nb, W)C solid solution was gradually formed. The hardness and impedance modulus (|Z|<sub>0.01Hz</sub>) of the cemented carbide increased to 1546 ± 7 kg/mm<sup>2</sup> and 2200 ± 31 Ω cm<sup>2</sup> at 2 wt% NbC. In addition, for additions of 2 wt% NbC, the corrosion current density (i<sub>corr</sub>) was 4.849 ± 0.5 × 10<sup>−6</sup> A/cm<sup>2</sup>, the coefficient of friction (COF), 0.287 ± 0.004 and the lowest wear rate of 0.85 ± 0.03 × 10<sup>−5</sup> mm<sup>3</sup>/(N⋅m) was observed. Therefore, the WC-based cemented carbides with 2 wt% NbC additive had the best comprehensive properties.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"129 ","pages":"Article 107099"},"PeriodicalIF":4.2,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143463761","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

Spark plasma sintering influence on microstructure and mechanical properties of Ti:Ta/carbonitride ceramic matrix composites 放电等离子烧结对Ti:Ta/碳氮化物陶瓷基复合材料显微组织和力学性能的影响

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

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Effects of different post-processing temperatures on the microstructure and mechanical properties of TiC-Ni cermets fabricated by selective laser melting 不同后处理温度对选择性激光熔化TiC-Ni金属陶瓷显微组织和力学性能的影响

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 热处理对非等原子Ni5.5Fe2.5CoCr高熵粘结剂钨重合金组织和力学性能的影响

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}

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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 核用钢上cWC和RSBs的低活化连接方法

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}

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Variation of microstructure and mechanical properties of NbMoVCr high-entropy alloy coatings doped silicon 掺硅NbMoVCr高熵合金涂层组织与力学性能的变化

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 了解电子束粉末床熔合钼的可加工性、显微组织和力学性能

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