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

Investigation into formability and mechanical properties of 93 W-7Ni alloy prepared by laser power bed fusion 激光动力床熔敷制备93 W-7Ni合金成形性能及力学性能研究

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-05-31 DOI: 10.1016/j.ijrmhm.2025.107269

Junfeng Li , Wan Zhangyi , Zijian Zhang , Wei Zhengying , Gao Shanping

{"title":"Investigation into formability and mechanical properties of 93 W-7Ni alloy prepared by laser power bed fusion","authors":"Junfeng Li , Wan Zhangyi , Zijian Zhang , Wei Zhengying , Gao Shanping","doi":"10.1016/j.ijrmhm.2025.107269","DOIUrl":"10.1016/j.ijrmhm.2025.107269","url":null,"abstract":"<div><div>Tungsten heavy alloys (WHA), as refractory materials with high-density and exceptional characteristics, demonstrate significant potential for advanced enginnering applications. Conventional sintering methods face substantial limitations in fabricating geometrically complex components. Laser powder bed fusion (LPBF) additive manufacturing technique offers a feasible method for the direct processing of tungsten heavy alloys parts. In this paper, W<img>Ni refractory heavy alloy samples with a W content of 93 wt% were successfully prepared by laser powder bed fusion using elemental powder mixtures. Un-melted W particles rearrangement and liquid phase filling dominate the densification process during the laser irradiates the mixed powders. When the linear energy density of 1.5 J·mm<sup>−1</sup> is adopted, the relative density of the final W<img>Ni alloy sample can reach 98.04 %. Microstructure results showed that LPBF-prepared W<img>Ni sample is composed of W phase and W-rich Ni matrix phase. Among them, the W phase exhibits the original nearly spherical or polygonal particles and fine granular or dendritic morphologies, which is significantly different from the traditional sintering methods. W<img>Ni samples have relatively high microhardness, and the average microhardness value is higher than 500 HV. Room-temperature tensile result showed the average ultimate tensile strength of LPBF-prepared sample is 1044.6 MPa with a poor elongation, and the fracture morphology demonstrated a hybrid fracture mode. The results validate the formality of W<img>Ni alloys in LPBF and provide a foundation for the direct processing of refractory tungsten heavy alloys parts with high densification and excellent properties via LPBF.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"132 ","pages":"Article 107269"},"PeriodicalIF":4.2,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144213174","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

Additively manufactured gradient cemented carbide substrates: Suppressing Co migration and enhancing wear resistance in polycrystalline diamond compact 增材制造的梯度硬质合金衬底：抑制Co迁移和提高聚晶金刚石致密体的耐磨性

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-05-31 DOI: 10.1016/j.ijrmhm.2025.107270

Wei Zhang , Jinbo Wu , Wei Zhang , Ye Liu , Yuxi Liu , Fan Zhang , Songhao Hu , Lan Huang

{"title":"Additively manufactured gradient cemented carbide substrates: Suppressing Co migration and enhancing wear resistance in polycrystalline diamond compact","authors":"Wei Zhang , Jinbo Wu , Wei Zhang , Ye Liu , Yuxi Liu , Fan Zhang , Songhao Hu , Lan Huang","doi":"10.1016/j.ijrmhm.2025.107270","DOIUrl":"10.1016/j.ijrmhm.2025.107270","url":null,"abstract":"<div><div>The mechanical performance of polycrystalline diamond compact (PDC) is significantly influenced by cobalt (Co) migration from the cemented carbide substrate to the polycrystalline diamond (PCD) layer during high-temperature high-pressure (HTHP). This study introduces a novel strategy to suppress Co migration using a functionally gradient cemented carbide substrate, fabricated via powder extrusion printing (PEP), leveraging WC grain size differences as a driving force. The results show that by optimizing powder loading and designing an interlocking interface, a gradient substrate with Co gradient of up to 6.2 wt%, minimal radial/longitudinal dimensional deviation (0.32/0.08 mm), and strong interfacial bonding was successfully developed. During HTHP, Co migration formed a ∼1.5 mm Co-depleted zone at the interface. The gradient substrate effectively suppressed Co migration and accumulation across the interface by enhancing capillary forces and dynamic migration pressure, reducing the Co content in the PCD layer by 16.35 % (to 6.1 wt%) and narrowing the Co-enriched zone at the interface by 64.5 % (to 7.6 μm) compared to a homogeneous substrate. Additionally, the gradient structure inhibited WC grain growth at the interface and facilitated W dissolution-precipitation strengthening within the PCD layer, leading to a 30.64 % improvement in wear resistance. These findings provide novel insights to optimizing PDC performance, and enhance a deeper understanding of the role of the cemented carbide substrate during HTHP.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"132 ","pages":"Article 107270"},"PeriodicalIF":4.2,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144194726","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

Influence of pressure on densification process of W-Cr-Y-Zr alloy consolidated at 1200 °C using spark plasma sintering 压力对火花等离子烧结W-Cr-Y-Zr合金1200℃固结致密化过程的影响

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-05-30 DOI: 10.1016/j.ijrmhm.2025.107273

Xiaoyue Tan , Shuyuan Liu , Chenjun Xu , Yuming Chen , Andrey Litnovsky , Jie Chen , Huijuan Zhu , Laima Luo , Yucheng Wu

{"title":"Influence of pressure on densification process of W-Cr-Y-Zr alloy consolidated at 1200 °C using spark plasma sintering","authors":"Xiaoyue Tan , Shuyuan Liu , Chenjun Xu , Yuming Chen , Andrey Litnovsky , Jie Chen , Huijuan Zhu , Laima Luo , Yucheng Wu","doi":"10.1016/j.ijrmhm.2025.107273","DOIUrl":"10.1016/j.ijrmhm.2025.107273","url":null,"abstract":"<div><div>Pressure is one of principal parameters of spark plasma sintering (SPS). It plays an important role on the powder densification process. In this paper, the Tungsten (W)-Chromium (Cr)-Yttrium (Y)-Zirconium (Zr) self-passivating tungsten alloys (SPTAs) were consolidated by SPS at 1200 °C under different pressure (15–85 MPa) to clarify the role of the pressure on microstructure evolution at the final densification stage. A modified creep theory was developed to evaluate the densification mechanism during the continuous heating process. It is found that the dominant mechanisms are particles displacement, grain boundary sliding, plastic flow (power-law creep) and grain boundary/lattice diffusion (diffusion creep) with the progress of the consolidation process. After calculation of the corresponding apparent activation energy, indicating that the pressure provides an additional driving force for SPTAs consolidation process. Scanning electron microscope was applied to characterize microstructure evolution. With the pressure increasing, the amount of Cr-rich phase in area increases from 1.43 % to 3.33 %. It is owing to the pressure enhanced the Cr atoms diffusion by inducing local lattice distortion and providing large amount nucleation sites. In addition, the pressure can break the large agglomerated particles and be contributed to inhibit grain growth and to prevent the abnormal of grain growth, make the grain size reduces from 237 ± 44 nm down to 105 ± 13 nm.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"132 ","pages":"Article 107273"},"PeriodicalIF":4.2,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144253550","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

Dynamic AC electrochemical etching method for fabricating porous tungsten FEEP emitters 动态交流电化学刻蚀法制备多孔钨FEEP发射体

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-05-30 DOI: 10.1016/j.ijrmhm.2025.107272

Yuqing Wang, Jianping Liu, Shanqing Yang

{"title":"Dynamic AC electrochemical etching method for fabricating porous tungsten FEEP emitters","authors":"Yuqing Wang, Jianping Liu, Shanqing Yang","doi":"10.1016/j.ijrmhm.2025.107272","DOIUrl":"10.1016/j.ijrmhm.2025.107272","url":null,"abstract":"<div><div>As a critical component of field emission electric propulsion (FEEP) systems, porous tungsten emitters require precise fabrication of micron-scale sharp tips to generate sufficient electric fields. While electrochemical etching has proven effective for solid tungsten tip preparation, its application to porous structures faces challenges from product accumulation in interconnected pores. This study presents an innovative dynamic alternating current (AC) electrochemical etching method that integrates periodic etching phases with in-situ bubble-assisted cleaning. The etching process involves the dynamic reciprocating motion of porous tungsten rods, which shapes them into conical tips. Between etching processes, H<sub>2</sub> bubbles generated from cathodic reactions are utilized to flush etching products from the porous matrix. By optimizing the switching timing of etching and cleaning, conical porous tungsten tips with apex radii below 5 μm were successfully fabricated. The method's effectiveness was validated through vacuum ignition tests of the processed emitters. This breakthrough addresses a critical manufacturing challenge in FEEP thruster development.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"132 ","pages":"Article 107272"},"PeriodicalIF":4.2,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144190042","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

Functionally graded tungsten–Inconel 718 structures via LPBF: Interfacial bonding, residual stresses, and corrosion performance 通过LPBF的功能梯度钨-铬镍铁合金718结构：界面结合、残余应力和腐蚀性能

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-05-30 DOI: 10.1016/j.ijrmhm.2025.107274

Gabriel Awuku Dzukey , Sara Ranjbareslamloo , Ala Qattawi , Bo Zhao , Toushiqul Islam , Shuaihang Pan

{"title":"Functionally graded tungsten–Inconel 718 structures via LPBF: Interfacial bonding, residual stresses, and corrosion performance","authors":"Gabriel Awuku Dzukey , Sara Ranjbareslamloo , Ala Qattawi , Bo Zhao , Toushiqul Islam , Shuaihang Pan","doi":"10.1016/j.ijrmhm.2025.107274","DOIUrl":"10.1016/j.ijrmhm.2025.107274","url":null,"abstract":"<div><div>Designing materials for high-temperature and oxidation-resistant environments with balanced properties remains a significant challenge with competing requirements between service conditions and environment-material interfaces. Single-material systems frequently fall short, but functionally graded materials (FGM) provide a solution via localized composition control. Complex FGM structures can be fabricated using laser powder bed fusion (LPBF) with the help of a custom-made in-situ powder deposition system. In LPBF of FGM, residual stress and defects, particularly in refractory metals such as tungsten (W), persist due to rapid thermal cycles. This study demonstrates how the fabrication of multi-powder layers of tungsten and nickel alloys (bimetallic FGM structure) with varying laser power affects the interfacial bonding, residual stress, and hardness. This study elaborates on how these changes are related to energy density. More pertinent to the application of W and IN718 under harsh environments, the corrosion resistance of W-IN718 FGM was also studied using electrochemical impedance spectrometry (EIS), and the results were compared to those of tungsten heavy alloy (WHA) and to each of the base materials (W and IN718). The results showed good bonding achieved through solid-state diffusion with improved material properties of hardness and successful fabrication of pure W powder with less residual stress and defects usually faced, such as cracks and pores at the interlayers. The FGM structure fabricated using LPBF proved to achieve an improved corrosion performance beyond WHA and pure W. The results of this study point to a promising direction of combining W and IN718 as FGM via LPBF.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"132 ","pages":"Article 107274"},"PeriodicalIF":4.2,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144261635","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

Research on the welding strength and V-shape joint structure in the welding of PCD micro tools PCD微型刀具焊接强度及v形接头结构研究

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-05-30 DOI: 10.1016/j.ijrmhm.2025.107261

Kechuang Zhang , Xian Wu , Xigui Wang , Laifa Zhu , Fuyin Huang , Guangda Liu , Jinxian Zhang

{"title":"Research on the welding strength and V-shape joint structure in the welding of PCD micro tools","authors":"Kechuang Zhang , Xian Wu , Xigui Wang , Laifa Zhu , Fuyin Huang , Guangda Liu , Jinxian Zhang","doi":"10.1016/j.ijrmhm.2025.107261","DOIUrl":"10.1016/j.ijrmhm.2025.107261","url":null,"abstract":"<div><div>Polycrystalline diamond (PCD) tools occupy a pivotal position in machining of nonferrous or high-hardness materials. In preparation of PCD tool, the welding process is usually applied to join the PCD tool tip and cemented carbide tool body. The welding strength is very important to ensure the PCD tool performance. In this paper, the butt-welding experiments were conducted between the PCD tool tip and cemented carbide tool body. Firstly, the effect of welding parameters on the welding strength and the related welding mechanisms were analyzed. It is found that the AgCuInTi filler metal can obtain the shear strength larger than the AgCuTi filler metal by 173.15 %, with the addition of the active element. The highest shear strength reaches 206.96 MPa, which obtained with the AgCuInTi filler metal, the welding temperature of 770 °C and the holding time of 10 min. Subsequently, the novelty V-shape joint structure in the welding of PCD micro tools was proposed. By comparison to the conventional flat joint structure, the V-shape joint structure increases the contact area between tool tip and tool body by 41.43 %, which increases the welding strength by 38.97 %. The research results can be applied to more demanding machining processes, providing the crucial practical evidence and theoretical support for the applications in the preparation of PCD micro tools.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"132 ","pages":"Article 107261"},"PeriodicalIF":4.2,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144194724","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

Study on the material removal characteristics of single crystal diamond polished by infrared picosecond laser 红外皮秒激光抛光单晶金刚石材料去除特性研究

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-05-30 DOI: 10.1016/j.ijrmhm.2025.107275

Ziyuan Luo , Jiabin Lu , Lijie Wu , Qiusheng Yan

{"title":"Study on the material removal characteristics of single crystal diamond polished by infrared picosecond laser","authors":"Ziyuan Luo , Jiabin Lu , Lijie Wu , Qiusheng Yan","doi":"10.1016/j.ijrmhm.2025.107275","DOIUrl":"10.1016/j.ijrmhm.2025.107275","url":null,"abstract":"<div><div>This study investigated the polishing performance and underlying mechanisms of infrared picosecond laser processing on single crystal diamond (SCD). Analysis of laser parameters' effects on surface roughness (Ra) and material removal depth revealed that the removal depth decreased with increasing focus position and scanning speed. A double-pass polishing process notably enhanced the removal depth, reaching 2.7 μm. Ra exhibited an initial decrease, followed by an increase, as focus position, scanning pitch, and scanning speed increased. After double-pass vertical polishing, the lowest Ra achieved was Ra 109 nm, representing a 41.7 % reduction from the initial surface, along with improved crystal quality. When the laser focus was positioned beneath the workpiece surface, constrained thermal expansion in the inner layers induced tensile stress at the surface, promoting crack formation. Graphitization of SCD was primarily influenced by pulse overlap ratio. It occurred when the lateral overlap ratio exceeded 95 %. The resulting lattice distortion from graphitization induced compressive stress on the SCD surface, with greater graphitization correlating to higher compressive stress. During the laser polishing process, surface oxygen content increased due to three primary mechanisms: intensified thermal oxidation, increased surface-active sites, and oxidation of the graphitic phase. Among these, the oxidation of the graphitic phase contributed most significantly to the formation of oxygen-containing functional groups, with oxygen predominantly existing as C<img>O bonds.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"132 ","pages":"Article 107275"},"PeriodicalIF":4.2,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144203172","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

Machine learning assisted phase prediction of refractory multi-component alloys based on data from low-, medium-, and high-entropy alloys 基于低、中、高熵合金数据的机器学习辅助难熔多组分合金的相预测

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-05-30 DOI: 10.1016/j.ijrmhm.2025.107263

Yuehua Wang , Mingqing Liao , Nan Qu , Xizhen Li , Danni Yang , Zhonghong Lai , Yong Liu , Fengjiang Wang , Jingchuan Zhu

{"title":"Machine learning assisted phase prediction of refractory multi-component alloys based on data from low-, medium-, and high-entropy alloys","authors":"Yuehua Wang , Mingqing Liao , Nan Qu , Xizhen Li , Danni Yang , Zhonghong Lai , Yong Liu , Fengjiang Wang , Jingchuan Zhu","doi":"10.1016/j.ijrmhm.2025.107263","DOIUrl":"10.1016/j.ijrmhm.2025.107263","url":null,"abstract":"<div><div>The performance of alloys is primarily determined by their microstructures and phases. Consequently, predicting phase formation is crucial for designing novel refractory high-entropy alloys (RHEAs). Although machine learning (ML) has recently been widely adopted for phase prediction in high-entropy alloys (HEAs), existing ML models for RHEAs are often limited by small datasets that focus exclusively on RHEAs, neglecting binary and ternary data. In this study, we extract 2982 composition-phase data points for refractory elements (Cr, Hf, Mo, Nb, Ta, Ti, V, W, and Zr) from binary and ternary phase diagrams and existing literature. Using this dataset, we construct an accurate support vector machine (SVM) model with training and test accuracies of 92 % and 87 %, respectively. The model is further validated using recent experimental data. Leveraging the well-trained model, we screen phase distributions across all ternary and quaternary phase diagrams. This work provides a robust framework for evaluating RHEA phases and offers valuable guidance for designing novel RHEAs.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"132 ","pages":"Article 107263"},"PeriodicalIF":4.2,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144203818","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

Volatilization behavior of high-purity MoO3 in the range of 600 °C to 750 °C: Influences of water-vapor concentration and reaction temperature 高纯MoO3在600 ~ 750℃范围内的挥发行为：水蒸气浓度和反应温度的影响

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-05-29 DOI: 10.1016/j.ijrmhm.2025.107264

Yong-Kang Zhang , Lu Wang , Zheng-Liang Xue

{"title":"Volatilization behavior of high-purity MoO3 in the range of 600 °C to 750 °C: Influences of water-vapor concentration and reaction temperature","authors":"Yong-Kang Zhang , Lu Wang , Zheng-Liang Xue","doi":"10.1016/j.ijrmhm.2025.107264","DOIUrl":"10.1016/j.ijrmhm.2025.107264","url":null,"abstract":"<div><div>In the work, the influences of water-vapor concentration and reaction temperature on the volatilization behavior of high-purity MoO<sub>3</sub> in the range of 600 °C to 750 °C were investigated. Different technologies such as XRD, FESEM, and thermodynamic software FactSage 8.3, were adopted to analyze the experimental data. The results showed that the volatilization rate of high-purity MoO<sub>3</sub> was increased with the increase of water-vapor concentration and reaction temperature, while the latter had a more obvious influence. The main gaseous species for the volatilization of high-purity MoO<sub>3</sub> under high-temperature water-vapor conditions included MoO<sub>2</sub>(OH)<sub>2</sub>, (MoO<sub>3</sub>)<sub><em>n</em></sub> (<em>n</em> = 2, 3, 4, and 5), H<sub>2</sub>, and O<sub>2</sub>, etc., among those MoO<sub>2</sub>(OH)<sub>2</sub> dominated. The work also found that the phase composition and morphological structure of the deposited phase had close relationships with the condensation temperature: i.e., when the condensation temperature was above 300 °C, α-MoO<sub>3</sub> with the plate-like morphology dominated; while when the condensation temperature was below 140 °C, β-MoO<sub>3</sub> with the polygonal morphology was more likely to be formed. The work may have an important role on the better understanding of the chemical vapor transport phase that usually generated during the H<sub>2</sub> reduction of MoO<sub>3</sub> to MoO<sub>2</sub> process.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"132 ","pages":"Article 107264"},"PeriodicalIF":4.2,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144184601","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

Molybdenum 8wt% rhenium alloy processed by laser powder bed fusion: From powder production to mechanical testing at elevated temperatures 激光粉末床熔合钼8wt%铼合金：从粉末生产到高温机械测试

IF 4.2 2区材料科学

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-05-29 DOI: 10.1016/j.ijrmhm.2025.107266

Aurore Leclercq , Anna Czech , Thibault Mouret , Marcin Lis , Adriana Wrona , Vladimir Brailovski

{"title":"Molybdenum 8wt% rhenium alloy processed by laser powder bed fusion: From powder production to mechanical testing at elevated temperatures","authors":"Aurore Leclercq , Anna Czech , Thibault Mouret , Marcin Lis , Adriana Wrona , Vladimir Brailovski","doi":"10.1016/j.ijrmhm.2025.107266","DOIUrl":"10.1016/j.ijrmhm.2025.107266","url":null,"abstract":"<div><div>Molybdenum is highly valued in industry because of its unique properties, especially at high temperatures. Additive manufacturing technologies, particularly laser powder bed fusion (LPBF), are becoming increasingly popular for producing complex shapes at a lower cost as compared to the conventional forming processes. However, printing molybdenum with LPBF presents challenges, especially caused by its hot cracking susceptibility. Several approaches have been explored to address this issue, including alloying molybdenum with other elements, which has proven effective in enhancing the printability and minimizing the occurrence of cracking, particularly with the addition of rhenium. In this study, a combination of mechanical blending of molybdenum powder and a rhenium precursor, followed by the reduction of the precursor and plasma spheroidization, was used to produce spherical 30–55 μm molybdenum‑rhenium (8 wt%) powders with rheological properties suitable for LPBF. Compared to pure molybdenum, the use of the alloyed powder led to an increase in the crack-free printed density, from 97 to 98.5 %, and in the compressive strength, from 240 to 340 MPa, at 600 °C and from 150 to 190 MPa at 1000 °C, at the expense of a ∼ 5 % reduction in the compression strain. To demonstrate the potential of printing complex geometries using the developed powders, complex geometry artifacts containing 0.25 mm-thin letters, wide dense sections and auto-supported 50 %-density 0.7 mm-thin strut diamond lattice structures were successfully printed.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"132 ","pages":"Article 107266"},"PeriodicalIF":4.2,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144178216","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