International Journal of Refractory Metals & Hard Materials最新文献_第3页

Microstructure evolution of WMoNbTiCrAlx (x = 0, 0.25, 0.5, 0.75, 1) multi-principal element alloys WMoNbTiCrAlx （x = 0, 0.25, 0.5, 0.75, 1）多主元素合金的组织演变

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-05-12 DOI: 10.1016/j.ijrmhm.2025.107225

Ágata Mayara Paula Pontes , Leandro Bernardes Serrano , Kátia Regina Cardoso , Miguel Angel Monge , Begoña Savoini Cardiel , Antonio Augusto Araújo Pinto da Silva , Geovani Rodrigues

{"title":"Microstructure evolution of WMoNbTiCrAlx (x = 0, 0.25, 0.5, 0.75, 1) multi-principal element alloys","authors":"Ágata Mayara Paula Pontes , Leandro Bernardes Serrano , Kátia Regina Cardoso , Miguel Angel Monge , Begoña Savoini Cardiel , Antonio Augusto Araújo Pinto da Silva , Geovani Rodrigues","doi":"10.1016/j.ijrmhm.2025.107225","DOIUrl":"10.1016/j.ijrmhm.2025.107225","url":null,"abstract":"<div><div>Multi-principal element alloys (MPEAs) based on refractory metals have been studied as potential candidates to replace Ni-based superalloys due to their superior melting temperatures and the promising initial high-temperature properties demonstrated by certain compositions. However, a significant drawback of these refractory metal-based alloys is their high density and low ductility at room temperature. It is known that the addition of Al in MPEAs contributes to reducing density, increasing hardness, and stabilizing the BCC phase. In this study, the influence of Al on the microstructure of five new multi-principal element refractory alloys produced by arc melting, using high-purity raw elements, WMoNbTiCrAlₓ (x = 0, 0.25, 0.5, 0.75, and 1), was analyzed. ThermoCalc software was utilized to support the interpretation of the experimental results. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were performed on all alloys in both as-cast and heat-treated (1200 °C/24 h) conditions. Additionally, electron backscatter diffraction (EBSD) analyses were performed on the heat-treated alloys. The as-cast alloys exhibited a highly segregated BCC phase with a dendritic structure. After heat treatment, the alloys predominantly presented a BCC phase, with a small volume fraction of the Laves phase being observed. Nanoindentation tests indicated that the addition of Al increases hardness, from 10.5 to 12.2 GPa. Regarding density, there was a decrease with increasing Al content, from 9.7982 to 8.7745 g/cm<sup>3</sup>.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"131 ","pages":"Article 107225"},"PeriodicalIF":4.2,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144068468","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

The microstructure evolution of in-situ laser remelted of (Ni/Ni3B + WC) + NiCrFeBSiC flame-sprayed coating 原位激光重熔(Ni/Ni3B + WC) + NiCrFeBSiC火焰喷涂涂层的显微组织演变

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-05-12 DOI: 10.1016/j.ijrmhm.2025.107231

G. Moskal , E. Szajna , M. Tupaj , A. Dudek , A. Tomaszewska , K. Szymański , A. Trzcionka-Szajna , T. Rzychoń , W. Zbyrad-Kołodziej , A. Trytek

{"title":"The microstructure evolution of in-situ laser remelted of (Ni/Ni3B + WC) + NiCrFeBSiC flame-sprayed coating","authors":"G. Moskal , E. Szajna , M. Tupaj , A. Dudek , A. Tomaszewska , K. Szymański , A. Trzcionka-Szajna , T. Rzychoń , W. Zbyrad-Kołodziej , A. Trytek","doi":"10.1016/j.ijrmhm.2025.107231","DOIUrl":"10.1016/j.ijrmhm.2025.107231","url":null,"abstract":"<div><div>This article presents research results related to microstructural changes in modified flame-sprayed DURMAT 61-PTA (NiFeSiB + WC/W<sub>2</sub>C) coating by introducing additional Metco 15E (NiCrFeBSiC) sublayers into the coating system with next laser remelting. This modification aimed to increase the adhesion of the large, high-melting and hard tungsten carbides to the substrate material and to facilitate and control the laser remelting of the coating. The modified coating was subjected to microstructural analysis regarding chemical and phase composition and hardness assessment. It was shown that the hardness of the layered (modified) coating after the laser melting process increased significantly, exceeding the additivity rules for mixtures. This suggests a noticeable synergy effect related to the mutual influence of both input materials. The research indicates that the effect responsible for the increase in hardness to approximately 61 HRC was the generation of tungsten borides as an essential strengthening phase. The probable in-situ formation of boride phases results from the primary dissolution of tungsten carbides in the matrix and the secondary formation of tungsten borides of various types. The observed synergistic effect is the essential benefit of using the above-mentioned technological concept of layered coatings, which is proposed to facilitate the preparation of technologically challenging coatings containing many phases based on tungsten carbide.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"131 ","pages":"Article 107231"},"PeriodicalIF":4.2,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144106959","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

On the comprehensive performance enhancement of polycrystalline diamond compact by initial diamond particle ratio optimization and cobalt removal treatment 初始金刚石颗粒比优化及脱钴处理对聚晶金刚石致密材料综合性能的提高

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-05-12 DOI: 10.1016/j.ijrmhm.2025.107226

Xueqi Wang , Jianbo Tu , Baochang Liu

{"title":"On the comprehensive performance enhancement of polycrystalline diamond compact by initial diamond particle ratio optimization and cobalt removal treatment","authors":"Xueqi Wang , Jianbo Tu , Baochang Liu","doi":"10.1016/j.ijrmhm.2025.107226","DOIUrl":"10.1016/j.ijrmhm.2025.107226","url":null,"abstract":"<div><div>The global oil and gas exploration was towards deep and ultra-deep formations. The complex drilling environment of the deep formations put forward higher requirements on the performance of drill bit materials. As the most commonly used drill bit materials in oil drilling, the performance of polycrystalline diamond compact (PDC) directly affected the drilling efficiency, drilling quality and drilling cost. Extensive researches showed that the diamond particle ratio optimization and cobalt removal treatment could highly improve the performance of PDC cutters. Therefore, in this paper, high performance PDCs with trimodal diamond particle size was prepared and the cobalt binder in polycrystalline diamond table was removed by acid leaching methods. The performance of cobalt-removed trimodal particle size PDC samples was compared with cobalt-removed single particle size PDC to study the influence of particles size on the performance of cobalt removal PDC. The performance test results showed that the abrasion resistance of trimodal diamond particle size PDC was improved by two-fold after the cobalt removal treatment, and compared with single particle size PDC after cobalt removal, it also was improved by 33 %. After diamond particle ratio optimization, the impact toughness of PDCs was also improved by up to 110.5 %.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"131 ","pages":"Article 107226"},"PeriodicalIF":4.2,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947559","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

Electrochemical corrosion behavior of WC-Co and WC-Ni cemented carbides: Effect of chloride and sulfate ions WC-Co和WC-Ni硬质合金的电化学腐蚀行为：氯离子和硫酸盐离子的影响

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-05-10 DOI: 10.1016/j.ijrmhm.2025.107224

Yafeng Zheng , Tiantian Huang , Jianhua Yao , Gemma Fargas , Elaine Armelin , Luis Llanes , Chenyang Xie , Daniel Crespo , Pere Bruna , Olivier Lavigne

{"title":"Electrochemical corrosion behavior of WC-Co and WC-Ni cemented carbides: Effect of chloride and sulfate ions","authors":"Yafeng Zheng , Tiantian Huang , Jianhua Yao , Gemma Fargas , Elaine Armelin , Luis Llanes , Chenyang Xie , Daniel Crespo , Pere Bruna , Olivier Lavigne","doi":"10.1016/j.ijrmhm.2025.107224","DOIUrl":"10.1016/j.ijrmhm.2025.107224","url":null,"abstract":"<div><div>In this work, the influence of chloride and sulfate ions on the corrosion behavior of WC-Co and WC-Ni cemented carbides is investigated using open circuit potential monitoring, potentiodynamic polarization, electrochemical impedance spectroscopy, and surface analytical techniques. Results reveal that the corrosion resistance of WC-Co cemented carbide is significantly compromised in the presence of chloride ions, with more negative corrosion potentials and higher corrosion current densities compared to the alloy in presence of sulfate ions. In contrast, due to its lower corrosion sensitivity, WC-Ni cemented carbide exhibits only slight dissolution behavior in both media, especially in the less aggressive sulfate-containing environment, where it demonstrates an outstanding corrosion resistance. WC-Ni cemented carbide also displays higher polarization charge transfer resistance than WC-Co counterparts. This is primarily attributed to the stable passivation layer of the WC-Ni hardmetal surface, which slows the charge transfer at the interface, impeding the oxidative reaction processes and effectively preventing corrosion. This different corrosion response is supported by small-scale hardness changes observed in WC-Co and WC-Ni cemented carbides, after corrosive immersion of both materials, especially in chloride-containing environments.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"132 ","pages":"Article 107224"},"PeriodicalIF":4.2,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124171","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

The role of surface energy and plasticity in determining the fracture toughness of tantalum and tungsten 表面能和塑性在决定钽和钨断裂韧性中的作用

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-05-08 DOI: 10.1016/j.ijrmhm.2025.107222

Sajjad Hossain , Hunter K. Brumblay , Gregory B. Thompson , Christopher R. Weinberger

{"title":"The role of surface energy and plasticity in determining the fracture toughness of tantalum and tungsten","authors":"Sajjad Hossain , Hunter K. Brumblay , Gregory B. Thompson , Christopher R. Weinberger","doi":"10.1016/j.ijrmhm.2025.107222","DOIUrl":"10.1016/j.ijrmhm.2025.107222","url":null,"abstract":"<div><div>This study quantifies the influence of impurities on the fracture behavior of tungsten (W) and tantalum (Ta) by examining their effects on ideal cleavage energy and fracture toughness. Using density functional theory (DFT), we calculated the reduction in ideal cleavage energy for both the {100} and {110} crystallographic planes of W and Ta due to various impurities, with He, O, P, and S showing significant embrittling effects. These reductions are converted to fracture toughness and incorporated into a dislocation dynamics model to predict changes in the brittle-to-ductile transition (BDT). While both metals exhibit increased brittleness with impurity introduction, tungsten is more sensitive to these effects. Additionally, impurity segregation at grain boundaries, even in ultrapure tungsten, could exacerbate embrittlement due to locally higher impurity concentrations, though experimental evidence for this segregation remains limited. However, small amounts (less than 0.1 %) of impurities, as found in ultrapure tungsten, have minimal impact on the fracture behavior of single-crystal tungsten. This work provides a comprehensive assessment of impurity effects on the fracture properties of W and Ta, offering critical insights for high-temperature applications.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"131 ","pages":"Article 107222"},"PeriodicalIF":4.2,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143935000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A discrete element method for mechanical behavior analysis of single-crystal silicon at different temperatures 单晶硅在不同温度下力学行为分析的离散元法

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-05-07 DOI: 10.1016/j.ijrmhm.2025.107223

Chuangting Lin , Weijing Xu , Longxing Liao , Xuefeng Chang

{"title":"A discrete element method for mechanical behavior analysis of single-crystal silicon at different temperatures","authors":"Chuangting Lin , Weijing Xu , Longxing Liao , Xuefeng Chang","doi":"10.1016/j.ijrmhm.2025.107223","DOIUrl":"10.1016/j.ijrmhm.2025.107223","url":null,"abstract":"<div><div>Single-crystal silicon (sc-Si) is a typical infrared material widely used in industries such as semiconductors and infrared imaging. At room temperature, sc-Si exhibits high hardness and brittleness, making it prone to defects like collapse and crack during processing. However, at elevated temperatures, sc-Si can undergo plastic deformation, which is of great significance for improving its manufacturing accuracy. Therefore, the effect of temperature on mechanical behavior of sc-Si was analyzed. Three-dimensional discrete element method (DEM) was used to simulate the effect of temperature on crack generation and propagation during the deformation of sc-Si. Then, nanoindentation and scratching tests were performed to compare the material's mechanical properties and removal processes at various temperatures. The results shows that the ductile machinability and the inhibition of crack propagation improve with increasing temperature. As the temperature rises, the hardness decreases, while the elastic modulus increases. The critical load required to induce cracks increases from 60 mN at room temperature to 100 mN at 400 °C. Elevated temperatures enhance the depth of the ductile-brittle transition of sc-Si, helping to suppress crack formation during scratching. These findings provide valuable insights into the deformation behavior of sc-Si, offering support for the manufacturing of sc-Si.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"131 ","pages":"Article 107223"},"PeriodicalIF":4.2,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143935002","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

Comparative study of microstructure and mechanical properties of Nb-Ti-Al alloy fabricated by as-cast and laser directed energy deposition processing 铸态与激光定向能沉积Nb-Ti-Al合金组织与力学性能的比较研究

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-05-07 DOI: 10.1016/j.ijrmhm.2025.107220

Zhiping Sun , RuiXue Du , FengYing Zhang , Enkui Zhuo , Yanqiang Qiao

{"title":"Comparative study of microstructure and mechanical properties of Nb-Ti-Al alloy fabricated by as-cast and laser directed energy deposition processing","authors":"Zhiping Sun , RuiXue Du , FengYing Zhang , Enkui Zhuo , Yanqiang Qiao","doi":"10.1016/j.ijrmhm.2025.107220","DOIUrl":"10.1016/j.ijrmhm.2025.107220","url":null,"abstract":"<div><div>Niobium alloy has attracted widespread attention in the aerospace industry due to its high strength, excellent weldability and formability. It is capable of producing structural thin plates and complex shaped parts by laser directed energy deposition (LDED). In this work, single-track Nb-37Ti-5Al samples were fabricated by LDED to optimize of processing parameters, then multi-track Nb-37Ti-5Al was prepared. The as cast Nb-37Ti-5Al was prepared to compare its mechanical properties with LDEDed alloy, the effect of oxygen content on the fracture behavior was revealed. LDEDed alloy has high strength and low ductility, which is mainly due to the high oxygen content in powder feedstocks. The stability, elastic properties, electronic structure of pure niobium (Nb), niobium with dissolved oxygen (Nb(O)), Nb-37Ti-5Al and Nb-37Ti-5Al with dissolved oxygen (Nb-37Ti-5Al(O)) were investigated using first principles calculation. Interstitial oxygen atom causes electron rearrangement of niobium, titanium and aluminum, which promotes the formation of ionic bonds and covalency bonds. This work provides new insight regarding the correlation between the interaction of oxygen and metallic elements at atomic-level and mechanical behavior.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"131 ","pages":"Article 107220"},"PeriodicalIF":4.2,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923304","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 B4C addition on microstructure and mechanical properties of Nb-16Si-20Ti alloys fabricated by laser melting deposition 添加B4C对激光熔敷Nb-16Si-20Ti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 : 2025-05-06 DOI: 10.1016/j.ijrmhm.2025.107221

Jing Liang, Zhina Xie, Xiuyuan Yin, Yikun Wang, Mengyue Wang, Changsheng Liu, Suiyuan Chen, Shuo Shang

{"title":"Effects of B4C addition on microstructure and mechanical properties of Nb-16Si-20Ti alloys fabricated by laser melting deposition","authors":"Jing Liang, Zhina Xie, Xiuyuan Yin, Yikun Wang, Mengyue Wang, Changsheng Liu, Suiyuan Chen, Shuo Shang","doi":"10.1016/j.ijrmhm.2025.107221","DOIUrl":"10.1016/j.ijrmhm.2025.107221","url":null,"abstract":"<div><div>Practical applications for Nb<img>Si alloys encountered difficulties because of their low room temperature fracture toughness and machinability. To achieve rapid alloy formation and enhance its fracture toughness, this study explored the effect of B<sub>4</sub>C additions on the microstructure and properties of Nb-16Si-20Ti alloy formed by Laser Melting Deposition (LMD). The results showed that the relative densities of LMDed alloys were all more than 97.0 % compared with arc melting alloys. The LMDed 0B<sub>4</sub>C alloy consisted of Nbss, Nb<sub>3</sub>Si, and Tiss phases. With the addition of B<sub>4</sub>C increased from 0 to 0.50 at. %, Nb<sub>3</sub>Si disappeared, a eutectic transformation reaction (Nb<sub>3</sub>Si → Nbss+ α-Nb<sub>5</sub>Si<sub>3</sub>) occurred, resulting in an increase in the volume fraction of Nbss from 39.5 % to 50.3 %. Further increased the B<sub>4</sub>C addition to 1.0 at. %, the microstructure transitioned from a Nbss+ α-Nb<sub>5</sub>Si<sub>3</sub> eutectic structure (without B<sub>4</sub>C addition) to a fine primary α-Nb<sub>5</sub>Si<sub>3</sub> and (Nbss+α-Nb<sub>5</sub>Si<sub>3</sub>) hypereutectic structure (with volume fraction of all α-Nb<sub>5</sub>Si<sub>3</sub> phases up to 41.4 %). The LMDed 1.0B<sub>4</sub>C exhibited the highest fracture toughness of 10.7 MPa·m<sup>1</sup><sup>/</sup><sup>2</sup> among all alloys due to the refinement of the microstructure and the isotropic of the stresses in the equiaxed crystal Nbss. Meanwhile, its compressive strength at room temperature reached a maximum of 2203.3 MPa, a result attributed to the grain refinement strengthening, solid solution strengthening effect of carbon and boron in Nb<sub>5</sub>Si<sub>3</sub>, and the increase in silicide content (with a total volume fraction of silicide phases at 51.6 %).</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"131 ","pages":"Article 107221"},"PeriodicalIF":4.2,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143935001","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

Adjusting recrystallization kinetics of WNiCo alloy by intensive shear strain 利用强剪切应变调节WNiCo合金再结晶动力学

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-05-06 DOI: 10.1016/j.ijrmhm.2025.107219

Josef Walek, Radim Kocich, Lenka Kunčická

{"title":"Adjusting recrystallization kinetics of WNiCo alloy by intensive shear strain","authors":"Josef Walek, Radim Kocich, Lenka Kunčická","doi":"10.1016/j.ijrmhm.2025.107219","DOIUrl":"10.1016/j.ijrmhm.2025.107219","url":null,"abstract":"<div><div>The study investigates the effects of intensive shear strain processing, performed by selected regimes of rotary swaging, on recrystallization kinetics and deformation behaviour of a WNiCo tungsten heavy alloy. The results of uniaxial hot compression tests and thorough microstructure observations indicate that the selected rotary swaging regime, especially the swaging temperature, influences significantly not only the occurrence and development of dynamic hardening/softening processes, which consequently influence the flow stress, but also the recrystallization kinetics as such. The deformation temperature of 1100 °C was sufficient to initiate dynamic recrystallization in the Ni<img>Co matrix, the average grain size within which decreased down to 1.9 μm. The deformation temperature of 1200 °C caused further softening within the matrix and intensified its plastic flow, which also supported joining of W agglomerates. Particularly the high swaging temperatures in combination with high strain rates (100 s<sup>−1</sup>) imparted flow stress maxima exceeding 1100 MPa. From the computational perspective, the complex effect of the occurring structure-forming phenomena on the behaviour of the WNiCo alloy was mapped by creating a rheological model, predicting its flow stress development under a wide range of temperatures. The rheological model was created via a regression analysis on the experimental data, and can serve as a basis for prospective numerical simulations using the finite element method.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"131 ","pages":"Article 107219"},"PeriodicalIF":4.2,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916964","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

Preparation of spherical tungsten trioxide by spray pyrolysis of peroxotungstic acid 过氧钨酸喷雾热解制备球形三氧化钨

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-05-03 DOI: 10.1016/j.ijrmhm.2025.107215

Yuqing Qiu , Pengyuan Liu , Xingyu Chen , Xuheng Liu , Ailiang Chen , Jiangtao Li , Lihua He , Fenglong Sun , Zhongwei Zhao

{"title":"Preparation of spherical tungsten trioxide by spray pyrolysis of peroxotungstic acid","authors":"Yuqing Qiu , Pengyuan Liu , Xingyu Chen , Xuheng Liu , Ailiang Chen , Jiangtao Li , Lihua He , Fenglong Sun , Zhongwei Zhao","doi":"10.1016/j.ijrmhm.2025.107215","DOIUrl":"10.1016/j.ijrmhm.2025.107215","url":null,"abstract":"<div><div>This paper proposes a short-process, environmentally friendly approach for preparing spherical tungsten oxide powder using peroxotungstic acid solution, and investigates the factors influencing the spray pyrolysis, as well as the underlying pyrolysis mechanism. The experimental results demonstrate that varying the concentration of peroxotungstic acid did not significantly affect droplet atomization efficiency, but more WO<sub>3</sub> led to the formation of coarser particles in a high-concentration solution. Droplets underwent uniform contraction at l80 °C, yielding smaller particles, whereas the formation of porous structures was promoted at 300 °C. Rapid carrier gas velocity (120 L/min) induced particle adhesion and the generation of secondary particles, yet it also facilitated the collection of finer particles. Furthermore, an increase in ultrasonic frequency correlated with a reduction in the particle size of the pyrolysis product. Solid spherical monoclinic tungsten trioxide could be obtained through low-temperature calcination at 400 °C without altering the particle morphology. This paper presents a promising solution to address the challenges of ammonia nitrogen pollution and process complexity in conventional tungsten refining.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"131 ","pages":"Article 107215"},"PeriodicalIF":4.2,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916963","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