Intermetallics最新文献

{"title":"Dynamic tensile behavior and deformation mechanism of carbon interstitial Fe40Mn40Co10Cr10 high entropy alloy","authors":"Liangbin Chen ,&nbsp;Xin Li ,&nbsp;Ke Tang ,&nbsp;Yuhang Shi ,&nbsp;Yaohui Li ,&nbsp;Yaoju Li ,&nbsp;Ran Wei ,&nbsp;Yanpu Chao ,&nbsp;Feng Jiang","doi":"10.1016/j.intermet.2025.108974","DOIUrl":"10.1016/j.intermet.2025.108974","url":null,"abstract":"<div><div>Carbon interstitial solid solution strengthening is an effective strategy to simultaneously enhance the strength and ductility of face-centered cubic high entropy alloys (HEAs). However, majority of studies have confined to quasi-static condition. In this study, the dynamic and quasi-static tensile mechanical behaviors of Fe₄₀Mn₄₀Co₁₀Cr₁₀ and (Fe₄₀Mn₄₀Co₁₀Cr₁₀)_96.7C_3.3 HEAs were investigated at room temperature. The results show that high strain rate can significantly improve the strength of both Fe₄₀Mn₄₀Co₁₀Cr₁₀ and (Fe₄₀Mn₄₀Co₁₀Cr₁₀)_96.7C_3.3 HEAs. The yield strength of Fe₄₀Mn₄₀Co₁₀Cr₁₀ and (Fe₄₀Mn₄₀Co₁₀Cr₁₀)_96.7C_3.3 increases from 245 MPa and 437 MPa at strain rate of 1 × 10⁻³ s⁻¹ to 530 MPa and 815 MPa at strain rate of 8 × 10³ s⁻¹. Moreover, the ultimate tensile strength of Fe₄₀Mn₄₀Co₁₀Cr₁₀ and (Fe₄₀Mn₄₀Co₁₀Cr₁₀)_96.7C_3.3 reaches to 1073 MPa and 1413 MPa at strain rate of 8 × 10³ s⁻¹, respectively. Whereas, the ductility of both HEAs declines remarkedly, with uniform elongation decreasing from 46.2 % and 67.4 % at strain rate of 1 × 10⁻³ s⁻¹ to 7.9 % and 25.2 % at strain rate of 8 × 10³ s⁻¹. The thermally activated dislocation motion and the phonon drag effects jointly contribute to the striking increment of yield strength with increasing strain rate. The temperature rise during dynamic deformation gives rise to stacking fault energy increasing, which inhibits the deformation twinning, resulting in the reduction of strain hardening rate and thus the reduced ductility. In particular, with the assistance of C solid solution, (Fe₄₀Mn₄₀Co₁₀Cr₁₀)_96.7C_3.3 exhibits enhanced twinning formation capability and superior resistance to shear bands formation than Fe₄₀Mn₄₀Co₁₀Cr₁₀, which enables a better combination of strength and ductility upon dynamic loads. These findings provide deep insights into dynamic deformation behavior of carbon interstitial face-centered cubic HEAs.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"186 ","pages":"Article 108974"},"PeriodicalIF":4.8,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144911868","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}

{"title":"Nanomechanical properties of AlTiZrNbTaV(C) high-entropy metallic glass films prepared by HiPIMS energetic ion beam","authors":"Xueyan Wu ,&nbsp;Pengyun Xu ,&nbsp;Shuai Wu ,&nbsp;Yangbin Liu ,&nbsp;Weiqing Yan ,&nbsp;Lin Chen ,&nbsp;Jiakun Wu ,&nbsp;Xu Zhang ,&nbsp;Bin Liao","doi":"10.1016/j.intermet.2025.108967","DOIUrl":"10.1016/j.intermet.2025.108967","url":null,"abstract":"<div><div>Engineering high-entropy metallic glasses (HE-MGs) often faces a trade-off between hardness and creep resistance, which limits structural deployment. This work demonstrates how interstitial carbon doping can decouple these properties in an AlTiZrNbTaV system. While carbon doping increased the hardness of AlTiZrNbTaVC by 101.60 % to 20.32 GPa, it paradoxically degraded creep resistance. As the strain rate sensitivity (<em>m</em>) of AlTiZrNbTaVC increased more than threefold, from 0.0401 for AlTiZrNbTaV to 0.1501 for AlTiZrNbTaVC. Relaxation time spectrum analysis reveals this degradation stems from lower activation energy barriers for shear transformation zones (STZs). These results establish that the activation energy of STZs, rather than free volume, is the dominant factor controlling room temperature creep in this system. This provides a clear strategy for tailoring HE-MGs by tuning their atomic-scale heterogeneity to achieve a targeted balance between hardness and stability.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"186 ","pages":"Article 108967"},"PeriodicalIF":4.8,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144902921","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}

{"title":"Multi-objective grey wolf optimization of selective laser melting process parameters for the fabrication of Al0.2CuFeMnNi high entropy alloy and evaluation of mechanical, tribological and corrosion behaviour","authors":"Hareharen K,&nbsp;Panneerselvam T","doi":"10.1016/j.intermet.2025.108968","DOIUrl":"10.1016/j.intermet.2025.108968","url":null,"abstract":"<div><div>Al_0.2CuFeMnNi high entropy alloy (HEA) has emerged as a promising material for structural and functional applications; however, its performance is strongly influenced by processing conditions during selective laser melting (SLM). This study focuses on enhancing the performance and surface quality, such as relative density (RD), Vickers Micro-hardness (VMH), and surface roughness (SR_a), by optimizing SLM parameters, laser power (P_l), scanning speed (V_s), and hatch spacing (H_s). A hybrid framework integrating random forest regression (RF-Reg) and multi-objective grey wolf optimization (MO-GWO) was developed to predict and optimize the process parameters. MO-GWO optimization produced RD of 98.63 %, VMH of 236.60 HV, and SR_a of 23.42 μm with P_l of 197.93 W, V_s of 753.40 mm/s, and H_s of 0.05 mm. The reliability of the optimization was confirmed by experimental validation. For RD, VMH, and SR_a, the error percentages among the outcomes from the experiment and the MO-GWO optimization model are 0.23 %, 1.75 %, and 6.30 %, respectively. Tensile testing revealed excellent mechanical performance with the yield strength of 525 MPa and an ultimate tensile strength of 649 MPa. Dry sliding wear analysis showed an increasing wear rate from 3.6464 x 10⁻⁴ at 20 N to 8.0439 x 10⁻⁴ at 40 N with decreasing coefficient of friction. Electrochemical analysis shows excellent corrosion resistance with corrosion potential, current density and polarization resistance of −430.784 mV, 12.911 μA/cm², and 3947.6 Ω cm² respectively. These results validate the effectiveness of the proposed optimization approach in enhancing the quality and performance of SLM-fabricated Al_0.2CuFeMnNi HEA.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"186 ","pages":"Article 108968"},"PeriodicalIF":4.8,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144908307","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}

{"title":"Effect of solution temperature on low-cycle fatigue behavior and microstructural evolution of GH4738 Ni-based superalloy","authors":"Mingjun Zhong ,&nbsp;Hao Yu ,&nbsp;Ziruo Wang ,&nbsp;Hanqi Xue ,&nbsp;Fengshuo Zhang ,&nbsp;Guanglei Wang ,&nbsp;Xiaomeng Zhang ,&nbsp;Jinglong Qu","doi":"10.1016/j.intermet.2025.108970","DOIUrl":"10.1016/j.intermet.2025.108970","url":null,"abstract":"<div><div>In this work, the impact of solution temperature on low-cycle fatigue (LCF) behavior and microstructural evolution of GH4738 Ni-based superalloy at 760 °C with a strain amplitude of 0.8 % was systematically investigated using multiscale characterization techniques, including electron backscatter diffraction (EBSD), scanning electron microscopy (SEM), and scanning transmission electron microscopy (STEM). The findings indicate that fatigue life decreases with increasing solution temperature, with optimal fatigue performance exhibited at a solution temperature of 1000 °C. EBSD analysis of microstructure near the fatigue fracture reveals that with the rise in solution temperature, the grain size gradually grows, while the geometrically necessary dislocation (GND) density progressively decreases. SEM observations indicate that the content of Cr-rich M₂₃C₆ grain boundary carbides rises with increasing solution temperature, and their morphology evolves from discrete particles to discontinuous chains, eventually forming a continuous distribution along the grain boundaries. The spherical γ′ phase in the microstructure transitions from a bimodal to a unimodal size distribution. As the solution temperature rises, the fatigue fracture mechanism transitions from intergranular to transgranular fracture. TEM analysis shows that the fatigue deformation mechanism shifts from Orowan bypassing and dislocation shearing to Orowan bypassing with the increase in solution temperature.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"186 ","pages":"Article 108970"},"PeriodicalIF":4.8,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144906837","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}

{"title":"Three-dimensional heterogenous bond network for modulating band structure and lattice vibration in the Sn10-xPbxSb2Te10Se3 system","authors":"Yijie Gu ,&nbsp;Jun Ma ,&nbsp;Xuye Xin ,&nbsp;Haifeng Wang ,&nbsp;Xiaoming Xu ,&nbsp;Yanfang Wang ,&nbsp;Hongquan Liu","doi":"10.1016/j.intermet.2025.108958","DOIUrl":"10.1016/j.intermet.2025.108958","url":null,"abstract":"<div><div>Bonding engineering is an important strategy for tailoring the physical and chemical properties of materials. Three-dimensional heterogenous bond network in high-entropy SnTe materials was designed via introduction of Sb_Sn, Pb_Sn, Se_Te and V_Sn for enhancing thermoelectric properties. Heterogeneity of bonding structure impact the material's energy band structure and density of states near the Fermi level, leading to enhanced resonant level and energy filtering effects. As a result, a high Seebeck coefficient and power factor of approximately 240 μVK⁻¹ and 1800μWm^-1 K⁻² are maintained at 773K, respectively. Further, analysis from charge density and -pCOHP demonstrates that Pb-doping and V_Sn induces significant weak bond and construct a 3D framework with alternating soft and hard bond, which substantially lowers the thermal conductivity. This strategic approach successfully minimizes lattice thermal conductivity while maintaining efficient power factor.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"186 ","pages":"Article 108958"},"PeriodicalIF":4.8,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144895246","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}

{"title":"Study on mechanical response and penetration mechanism of lightweight BCC high-entropy alloy (Ti2Zr)1.5NbVAl0.5 under extreme dynamic loads","authors":"Heling Zheng ,&nbsp;Zhanxuan Wang ,&nbsp;Mingyang Wang ,&nbsp;Xiancheng Li ,&nbsp;Xintian Li ,&nbsp;Zhengkun Li ,&nbsp;Zhonghua Du ,&nbsp;Lizhi Xu","doi":"10.1016/j.intermet.2025.108966","DOIUrl":"10.1016/j.intermet.2025.108966","url":null,"abstract":"<div><div>Aiming at the mechanical response and penetration mechanism of Body-centered Cubic (BCC) structured lightweight High-entropy Alloys (HEAs) under extreme dynamic loads, this paper takes the non-equimolar single-phase BCC structured (Ti₂Zr)_1.5NbVAl_0.5 HEA as the research object. Through Split-Hopkinson Pressure Bar (SHPB) dynamic compression tests and ballistic penetration tests, combined with microstructural characterization, the dynamic strengthening mechanism, Adiabatic Shear Band (ASB) propagation law, and penetration mode transition mechanism within the high strain rate range of 6000∼10⁴s⁻¹ were systematically revealed. The research results show that the alloy exhibits significant strain rate sensitivity, with the yield strength increasing from 1980.4 MPa (6000s⁻¹) to 2646.5 MPa (10⁴s⁻¹). The dynamic strengthening effect originates from the competition between dislocation multiplication and thermal softening mechanisms. During penetration, the alloy demonstrates dual-mode characteristics of “self-sharpening” and “mushrooming”, with a critical transition velocity of 1374 m/s. Below this value, the “self-sharpening” mode reduces penetration resistance through shear stripping and lubrication by a molten aluminum layer. At high speeds, the inertial effect triggers plastic instability at the head, causing energy dissipation to shift toward radial plastic deformation. Differences in target wave impedance regulate energy distribution pathways through stress wave reflection: shear-dominated local failure occurs in low-impedance aluminum targets, while triaxial hydrostatic pressure in high-impedance steel targets induces global plastic flow. Additionally, dynamic recrystallization and grain boundary liquefaction within ASBs are the core causes of stress collapse. Grain fragmentation and preferential orientation along [111] confirm that shear deformation dominates the recrystallization process. This study provides theoretical and experimental foundations for the design and application of BCC lightweight HEAs under extreme dynamic loads.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"186 ","pages":"Article 108966"},"PeriodicalIF":4.8,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144893529","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}

{"title":"Prediction of the tensile properties of ODS ferritic/martensitic steels under various temperature conditions using interpretable machine learning models","authors":"Zhan-Xing Li,&nbsp;Tian-Xing Yang,&nbsp;Akihiko Kimura,&nbsp;Peng Dou","doi":"10.1016/j.intermet.2025.108962","DOIUrl":"10.1016/j.intermet.2025.108962","url":null,"abstract":"<div><div>It is crucial to accurately and reliably predict the mechanical properties of oxide dispersion strengthened (ODS) steels for their application in Generation IV nuclear reactors. In this work, six machine learning models were utilized to predict the ultimate tensile strength and total elongation of ODS steels under various temperature conditions. The extreme gradient boosting (XGBoost) models exhibited the best predictive performance, with R², RMSE, and MAE values of 0.96, 79 MPa, and 57 MPa for ultimate tensile strength prediction, respectively, and 0.90, 1.9%, and 1.6% for total elongation prediction, respectively. Shapley Additive Explanations (SHAP) method was used to interpret the model by analyzing feature importance and its corresponding impact trends. The key chemical compositions affecting ultimate tensile strength are Ti, Y₂O₃, Cr, and W, whereas significant process parameters include heat treatment temperature (HT) and consolidation temperature (CT). Among these, Ti, Y₂O₃, and W positively correlate with ultimate tensile strength, whereas HT and CT negatively correlate. However, the key chemical compositions affecting total elongation are Y₂O₃, W, Cr, and Ti, whereas significant process parameters include HT and CT. Among these, W, HT, and CT positively correlate with total elongation, whereas Ti negatively correlates. Furthermore, the interactions between important features obtained through SHAP analysis were discussed. This study established relationships among composition, processing, and tensile properties of ODS steels, thereby supporting the optimization of composition design and process improvements.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"186 ","pages":"Article 108962"},"PeriodicalIF":4.8,"publicationDate":"2025-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144890046","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}

{"title":"Enhancing corrosion resistance of non-equiatomic FeNiCoCr high-entropy alloys via metalloid Si alloying","authors":"Pengfei Wu ,&nbsp;Dingshun Yan ,&nbsp;Yong Zhang ,&nbsp;Zhiming Li","doi":"10.1016/j.intermet.2025.108963","DOIUrl":"10.1016/j.intermet.2025.108963","url":null,"abstract":"<div><div>This study investigated the electrochemical corrosion behaviors of a Si-containing high strength and ductile non-equiatomic Fe₃₀Ni₂₀Co₂₀Cr₂₀Si₁₀ high-entropy alloy (HEA) with a single-phase solid solution structure in a 3.5 wt% NaCl solution. Compared to Si-free Fe₂₀Ni₂₀Co₂₀Cr₂₀Mn₂₀ and Fe₄₀Ni₂₀Co₂₀Cr₂₀ HEAs with identical Cr contents, the present HEA alloyed with metalloid Si shows prominent corrosion resistance with a significantly higher positive breakdown potential (∼1 V_SCE) and a lower current density (∼7.62 × 10⁻⁸ A/cm²). The elevated corrosion resistance is attributed to the reinforced stability of the passive film with modulated compositions by alloying of metalloid Si and elimination of Mn. The alloying of Si triggers the formation of (Fe, Cr)-mixed silicate in the passive film, yielding a high stability. In contrast, the presence of Mn oxides in the passive film of Fe₂₀Ni₂₀Co₂₀Cr₂₀Mn₂₀ degrades the anti-corrosion performance. These insights are useful for guiding the further development of strong and ductile alloys with superior anti-corrosion performance.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"186 ","pages":"Article 108963"},"PeriodicalIF":4.8,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144886776","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}

{"title":"Temperature dependence on ripening and spalling of interfacial (Cu,Ni)6Sn5 compound at SnAgCu(Ni)/Ni(P) interface","authors":"Ya-Hui Hsu,&nbsp;Shao-An Pan,&nbsp;Yi-Cheng Su,&nbsp;Chin-Li Lin,&nbsp;Heng-Chen Hsieh,&nbsp;Albert T. Wu,&nbsp;Cheng-Yi Liu","doi":"10.1016/j.intermet.2025.108965","DOIUrl":"10.1016/j.intermet.2025.108965","url":null,"abstract":"<div><div>In this work, the in situ Cu and Ni contents in the molten SnCuAg(Ni) solder reflowed on Ni(P) were calculated against the reflowing time at 250 °C, 265 °C, and 280 °C. The phases and morphology of the interfacial compound forming at the SnAgCu(Ni)/Ni(P) reaction interface were also determined with time and temperature. The phases corresponding to the present determined Cu, Ni, and Sn composition in the reported Cu–Sn–Ni ternary phase diagram at 250 °C did not match the interfacial (Cu,Ni)₆Sn₅ compound formed in the 250 °C case. Thus, the reported Cu–Sn–Ni ternary phase diagram at 250 °C was modified to fit the present experimental results. At 250 °C, ripening occurred on the interfacial (Cu,Ni)₆Sn₅ compound grains and eventually caused them to spall from the interface. For the 265 °C case, the faster ripening caused the earlier formation of valleys and small spacing between the (Cu,Ni)₆Sn₅ compound grains after a 10-s reflowing. After a 20-s reflowing, the needle-shaped (Ni,Cu)₃Sn₄ compound phase began to form at the valley sites of the interfacial (Cu,Ni)₆Sn₅ compound layer, which hindered the spalling of the (Cu,Ni)₆Sn₅ compound grains. After a 40-s reflowing, (Cu,Ni)₆Sn₅ compound grains remained attached and mixed with the (Ni, Cu)₃Sn₄ compound. For the 280 °C case, we believe that the ripening of the (Cu,Ni)₆Sn₅ compound grains quickly occurred (within seconds). Hence, the needle-shaped (Ni,Cu)₃Sn₄ compound largely formed between (Cu,Ni)₆Sn₅ compound grains in the 10-s reflowing. After a prolonged 40-s reflowing, the (Cu,Ni)₆Sn₅ compound grains completely spalled off from the interface and the needle-shaped (Ni,Cu)₃Sn₄ compound covered and dominated the entire reaction interface.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"186 ","pages":"Article 108965"},"PeriodicalIF":4.8,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144863326","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}

{"title":"Boron-induced microstructure evolution and related wear behavior in NbMoTaWBx high-entropy alloys and composites at room and elevated temperatures","authors":"Lijun Wang ,&nbsp;Lulu Guo ,&nbsp;Huicong Chen ,&nbsp;Chenwei Shao ,&nbsp;Zhaoying Ding ,&nbsp;Hyun Suk Choi ,&nbsp;Maxx Yao ,&nbsp;Yu Zou","doi":"10.1016/j.intermet.2025.108964","DOIUrl":"10.1016/j.intermet.2025.108964","url":null,"abstract":"<div><div>Refractory high entropy alloys (RHEAs) such as NbMoTaW exhibit potential for wear-resistant applications due to their high hardness and thermal stability at elevated temperatures. The addition of boron (B) may lead to a transformation from RHEAs into refractory high entropy composites (RHECs) due to the formation of hard boride phases. This transition is anticipated to significantly increase the hardness and wear resistance over a large temperature range. In this study, we investigate the impact of boride reinforcements on the microstructure and wear performance of the NbMoTaWB_x (x = 0–2) at room and elevated temperatures up to 600 °C. The results show the following: (i) The microstructure evolves from a dendritic microstructure to a complex microstructure with eutectic phase, dispersed body-centered cubic (BCC) particles and boride phases, showing the transition from RHEAs to RHECs; (ii) At room temperature, the wear rate decreases with increasing boron content, with abrasive wear as the primary mode and oxidation wear as minor contribution; (iii) At 600 °C, the wear rate increases with increasing boron content, and the dominant wear mode is oxidation-abrasion.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"186 ","pages":"Article 108964"},"PeriodicalIF":4.8,"publicationDate":"2025-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144858031","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}