Intermetallics最新文献_第8页

Tuning magnetic frustration via composition: Spin-glass dynamics and phase diagrams of sigma-phase Fe–Cr–Ni alloys 通过成分调整磁挫折：sigma相Fe-Cr-Ni合金的自旋玻璃动力学和相图

IF 4.8 2区材料科学

Intermetallics Pub Date : 2026-02-01 Epub Date: 2025-11-28 DOI: 10.1016/j.intermet.2025.109109

Piotr Konieczny , Dominik Czernia , Stanisław M. Dubiel

{"title":"Tuning magnetic frustration via composition: Spin-glass dynamics and phase diagrams of sigma-phase Fe–Cr–Ni alloys","authors":"Piotr Konieczny , Dominik Czernia , Stanisław M. Dubiel","doi":"10.1016/j.intermet.2025.109109","DOIUrl":"10.1016/j.intermet.2025.109109","url":null,"abstract":"<div><div>A series of three sigma-phase Fe-Cr-Ni intermetallic compounds — Fe<sub>45.8</sub>Cr<sub>49</sub>Ni<sub>5.2</sub>, Fe<sub>50.7</sub>Cr<sub>46.7</sub>Ni<sub>2.6</sub>, and Fe<sub>52.5</sub>Cr<sub>45.55</sub>Ni<sub>1.95</sub> — were systematically studied using ac and dc magnetic susceptibility measurements to construct their respective magnetic phase diagrams in the temperature-field (<em>H</em>-<em>T</em>) space. These compounds, characterized by increasing Fe content and decreasing Cr and Ni content, all exhibit ferrimagnetic ordering below their critical temperatures (<em>T</em><sub>c</sub>), accompanied by significantly negative Curie-Weiss temperatures (<em>θ</em> = −461(22) K, −155(6) K, and −134(11) K, respectively), indicating strong antiferromagnetic interactions. A re-entrant magnetic behavior was observed in all samples, transitioning into a spin-glass state at lower temperatures. The degree of magnetic frustration, quantified by the degree of frustration (DOF), was found to increase with Cr and Ni content, peaking at DOF = 34 for Fe<sub>45.8</sub>Cr<sub>49</sub>Ni<sub>5.2</sub>. The spin-glass state exhibits heterogeneity, comprising two substates with weak and strong irreversibility. The share of the spin-glass phase in the magnetic phase diagram diminishes as the Cr and Ni content increases. Analysis of the relative shift of the spin freezing temperature per decade of frequency, confirms that all compounds exhibit cluster spin-glass behavior.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"189 ","pages":"Article 109109"},"PeriodicalIF":4.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145617259","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

Phase stability in a SiC/Mo5SiB2 (T2) diffusion couple at 1700 °C SiC/Mo5SiB2 （T2）扩散偶联1700℃时的相稳定性

IF 4.8 2区材料科学

Intermetallics Pub Date : 2026-02-01 Epub Date: 2025-11-27 DOI: 10.1016/j.intermet.2025.109100

J.R. Becker , L. Liu , C. Zhang , M. Niezgoda , J.H. Perepezko

{"title":"Phase stability in a SiC/Mo5SiB2 (T2) diffusion couple at 1700 °C","authors":"J.R. Becker , L. Liu , C. Zhang , M. Niezgoda , J.H. Perepezko","doi":"10.1016/j.intermet.2025.109100","DOIUrl":"10.1016/j.intermet.2025.109100","url":null,"abstract":"<div><div>To evaluate the phase stability, a diffusion couple experiment of Mo<sub>5</sub>SiB<sub>2</sub> (T<sub>2</sub>) and SiC in contact was conducted at 1700 °C for 150 h. The post-anneal bonded interface was examined by high-resolution scanning transmission electron microscopy (STEM). The results show no formation of other compounds and minimal interdiffusion between the two phases, indicating that T<sub>2</sub> and SiC are in thermodynamic equilibrium. A CALPHAD model phase diagram of T<sub>2</sub> in contact with SiC shows the predicted formation of MoB, Mo<sub>2</sub>BC, and Mo<sub>5</sub>Si<sub>3</sub>C phases that were not seen. The discrepancy between the model prediction and the observed equilibria was due to the T<sub>2</sub> phase being treated as a line compound, when it really contains a homogeneity range. When accounting for the T<sub>2</sub> compositional variance, the model matched the experimental results. This was further confirmed by annealing a Mo-Si-B-C alloy at 1700 °C for 150 h, which showed a microstructure of T<sub>2</sub>, SiC, Mo<sub>5</sub>Si<sub>3</sub>C, and MoB phases that matched the predicted phase equilibria in the improved thermodynamic model.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"189 ","pages":"Article 109100"},"PeriodicalIF":4.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145617258","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

Understanding the process-microstructure-property relationships in a L12-strengthened high-entropy alloy fabricated by binder jet 3D printing 粘结剂喷射3D打印制备l12强化高熵合金的工艺-显微组织-性能关系研究

IF 4.8 2区材料科学

Intermetallics Pub Date : 2026-02-01 Epub Date: 2025-12-06 DOI: 10.1016/j.intermet.2025.109122

Xiaohui Qin , Liran Huang , Pei Wang , Wentao Yan , Zhiqiang Fu

{"title":"Understanding the process-microstructure-property relationships in a L12-strengthened high-entropy alloy fabricated by binder jet 3D printing","authors":"Xiaohui Qin , Liran Huang , Pei Wang , Wentao Yan , Zhiqiang Fu","doi":"10.1016/j.intermet.2025.109122","DOIUrl":"10.1016/j.intermet.2025.109122","url":null,"abstract":"<div><div>We report the fabrication of a L1<sub>2</sub>-strengthened high-entropy alloy (HEA), Ni<sub>27.7</sub>Cr<sub>24</sub>Co<sub>23.5</sub>Fe<sub>15.7</sub>Mo<sub>1.6</sub>Al<sub>3</sub>Ti<sub>4.5</sub> (at. %), using binder jet 3D printing (BJ3DP), consisting of printing and subsequent sintering. The resulting alloy exhibits high strength and corrosion resistance. This study systematically investigates the interdependence among processing parameters, microstructural evolution, and resulting properties. Optimal printing parameters (50 μm layer thickness, 50 % binder saturation, 3 mm/s spreading speed) yielded a green density of ∼58 %. Subsequent sintering at 1280 °C for 4 h achieved the highest relative density of ∼99.2 %. The microstructural evolution during sintering governed L1<sub>2</sub> precipitation and porosity, which in turn dictated the mechanical properties and corrosion resistance. Superior performance was achieved after sintering at 1280 °C. This condition produced enhanced densification and refined L1<sub>2</sub> precipitates, resulting in a yield strength of ∼726 MPa, ultimate tensile strength of ∼1112 MPa, and elongation of ∼16.5 %. Conversely, sintering at 1290 °C caused partial melting and precipitate coarsening, which degraded both strength and corrosion resistance. Electrochemical tests in 3.5 wt% NaCl solution confirmed the optimal corrosion resistance of the 1280 °C sample, which exhibited a pitting potential (∼0.97 V<sub>SCE</sub>) significantly higher than that of 316L stainless steel. In contrast, samples sintered below 1280 °C showed excessive porosity, while those above 1290 °C exhibited microstructural instability, both leading to severe pitting and galvanic corrosion. These results establish clear process–microstructure–property relationships for BJ3DP-fabricated HEAs and demonstrate a viable pathway for tailoring multifunctional performance through controlled processing.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"189 ","pages":"Article 109122"},"PeriodicalIF":4.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145682044","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

Achieving strength-ductility synergy in Ta/Ti Co-doped γ′-Ni3Al precipitates: An integrated theoretical and experimental investigation 在Ta/Ti共掺杂γ′-Ni3Al析出物中实现强度-延性协同：理论和实验的综合研究

IF 4.8 2区材料科学

Intermetallics Pub Date : 2026-02-01 Epub Date: 2025-12-11 DOI: 10.1016/j.intermet.2025.109120

Ziyi Ren , Yuchao Lin , Yongle Hu , Yonggang Tong , Pengfei Wu , Xiubing Liang , Jingzhong Fang , Xixi Ji , Kaiming Wang , Mingjun Zhang

{"title":"Achieving strength-ductility synergy in Ta/Ti Co-doped γ′-Ni3Al precipitates: An integrated theoretical and experimental investigation","authors":"Ziyi Ren , Yuchao Lin , Yongle Hu , Yonggang Tong , Pengfei Wu , Xiubing Liang , Jingzhong Fang , Xixi Ji , Kaiming Wang , Mingjun Zhang","doi":"10.1016/j.intermet.2025.109120","DOIUrl":"10.1016/j.intermet.2025.109120","url":null,"abstract":"<div><div>γ′-Ni<sub>3</sub>Al precipitate dictates elevated-temperature performance of the nickel-based superalloys but exhibit hardness deficiency under extreme thermomechanical loads. We devised a Ta and Ti co-doped strategy to overcome this deficiency, revealing atomic-scale synergistic strengthening mechanisms by experimental and theoretical methods. Optimal 12.5 at. % Ta doping enhances microhardness to 1023.6 Hv through the intensification of Ni-Ta covalent bonding. However, excessive Ta has been induced lattice instability. Ti effectively stabilizes the crystal structure via charge redistribution, with pronounced directional hybridization between Ti-3d and Ni orbitals establishes stable electron cloud configurations. Remarkably, the co-doped Ni<sub>3</sub>Al<sub>0.25</sub>Ta<sub>0.25</sub>Ti<sub>0.5</sub> precipitate achieves exceptional mechanical performance, exhibiting a remarkable 49.4 % enhancement in microhardness to 1112.03 Hv compared to pristine γ′-Ni<sub>3</sub>Al (744.33Hv) while maintaining superior plasticity. Furthermore, the γ′-Ni<sub>3</sub>(Al, Ta, Ti)-strengthened ATT alloy exhibits a yield strength exceeding 1.2 GPa while retaining 20 % plasticity, achieving an exceptional strength-ductility synergy that is consistent with computational predictions. Critical strengthening is attributed to Ta and Ti elements directional reinforcement of Ni-Al bonds. Ta-5d/Ti-3d orbital hybridization induces an enhanced density of states near the Fermi level. The present work provides a design method for nickel-based superalloys with strength-ductility synergy.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"189 ","pages":"Article 109120"},"PeriodicalIF":4.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733910","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

Microstructural and tribological characteristics of boroaluminized Monel K-500 superalloy 硼铝化蒙奈尔K-500高温合金的显微组织和摩擦学特性

IF 4.8 2区材料科学

Intermetallics Pub Date : 2026-02-01 Epub Date: 2025-12-19 DOI: 10.1016/j.intermet.2025.109131

İlyas Türkmen

{"title":"Microstructural and tribological characteristics of boroaluminized Monel K-500 superalloy","authors":"İlyas Türkmen","doi":"10.1016/j.intermet.2025.109131","DOIUrl":"10.1016/j.intermet.2025.109131","url":null,"abstract":"<div><div>This study investigates the surface enhancement of Monel K-500 alloy through the boroaluminizing process. Boroaluminized layers were produced by sequential powder-pack boriding (850–950 °C, 6 h) followed by aluminizing at 750 °C for 6 h. Optical and scanning electron microscopy examinations demonstrated that the boroaluminized layers were compact, with a thickness of approximately 129–133 μm. Energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) analyses were employed to identify the elemental distribution and phase composition of the layers. The layers formed in the boroaluminized samples consisted of various nickel borides, nickel aluminides, and complex intermetallic phases. The microhardness of the layers was measured to range from 890 HV to 1060 HV. Ball-on-disk wear tests carried out under dry sliding conditions at ambient temperature revealed that the boroaluminized samples exhibited a 3.2–3.6-fold improvement in wear resistance compared to the untreated substrate. Furthermore, the friction coefficient was reduced by approximately 1.8 times. In accordance with the Daimler-Benz Rockwell-C indentation tests, acceptable adhesion strength was confirmed exclusively for the BA90 sample. These results highlight the potential of boroaluminizing as an effective method for significantly enhancing the mechanical and tribological performance of Monel K-500, making it suitable for demanding applications.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"189 ","pages":"Article 109131"},"PeriodicalIF":4.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145786551","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

Microstructure and properties of NiTi/NiTiNb ultrafine eutectic composite welded joints with superelasticity 超弹性NiTi/NiTiNb超细共晶复合焊接接头的组织与性能

IF 4.8 2区材料科学

Intermetallics Pub Date : 2026-02-01 Epub Date: 2025-12-15 DOI: 10.1016/j.intermet.2025.109133

Bo Feng , Ke Yang , Hui Shen , Zhixin Su , Jianhua Zhao , Yifan Wu , Shijie Hao

{"title":"Microstructure and properties of NiTi/NiTiNb ultrafine eutectic composite welded joints with superelasticity","authors":"Bo Feng , Ke Yang , Hui Shen , Zhixin Su , Jianhua Zhao , Yifan Wu , Shijie Hao","doi":"10.1016/j.intermet.2025.109133","DOIUrl":"10.1016/j.intermet.2025.109133","url":null,"abstract":"<div><div>NiTi shape memory alloys (SMAs), as typical advanced functional intermetallics, have extensive applications. While their complex-structured components have been restricted by poor weldability. In this study, eutectic-composition NiTiNb wires were used as the interlayer to fabricate NiTi welded joints via laser welding, aiming to address the issues of porosity, brittle precipitations, and properties’ degradation in conventional NiTi welds. The results demonstrate that the welded joint exhibits a refined eutectic microcomposite. The high fluidity of the NiTiNb eutectic suppress the formation of porosity and brittle phases in the weld zone. Meanwhile, the NiTi constituent in the eutectic endows a continuous interface transition between the weld joint and the NiTi based sheets. The soft β-Nb phase in the eutectic mitigates the joint hardness and brittleness. In addition, this NiTi/NiTiNb welded composite achieves a tensile strain exceeding 10 % and a superelastic strain of over 5 %, both far outperforming the directly welded NiTi joint. This work provides a novel strategy for improving the weldability of NiTi SMAs, holding great potential for applications in functional devices.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"189 ","pages":"Article 109133"},"PeriodicalIF":4.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145786553","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

Synthesis of CuTi intermetallic compound by mechanical alloying route 机械合金化法合成CuTi金属间化合物

IF 4.8 2区材料科学

Intermetallics Pub Date : 2026-02-01 Epub Date: 2025-12-05 DOI: 10.1016/j.intermet.2025.109117

Edara Abhay Choudhury , Nityananda Sahoo , Arka Ghosh , Parth Patel , Pankaj Shivastava , Syed Nasimul Alam , Rajan Kumar , Debasish Sahu , Nikhil Bogoju , Abhishek Kumar , Velaphi Msomi , Deepankar Panda

{"title":"Synthesis of CuTi intermetallic compound by mechanical alloying route","authors":"Edara Abhay Choudhury , Nityananda Sahoo , Arka Ghosh , Parth Patel , Pankaj Shivastava , Syed Nasimul Alam , Rajan Kumar , Debasish Sahu , Nikhil Bogoju , Abhishek Kumar , Velaphi Msomi , Deepankar Panda","doi":"10.1016/j.intermet.2025.109117","DOIUrl":"10.1016/j.intermet.2025.109117","url":null,"abstract":"<div><div>A solid phase consisting of two or more metallic or semimetallic elements with well-defined stoichiometry and an ordered structure is called an intermetallic compound (IMC). IMCs are a diverse resource to understand the relationships between atomic structure, physical characteristics, and chemical composition. In this work, elemental powders of Cu and Ti in an equiatomic ratio were mechanically alloyed (MA) to develop the CuTi IMC. After 30 h of milling, the powder was annealed for 2 h at 1000<sup>o</sup>C in an Ar atmosphere. In this novel method, Cu and Ti powders are milled in a 1:1 atomic ratio (Cu - 42.96 wt% Ti) for 30 h. The milled powder was then heated to 1000 °C for 2 h in an Ar atmosphere. Analytical methods such as high-resolution transmission electron microscopy (HRTEM), x-ray diffraction (XRD), electron dispersion x-ray spectroscopy (EDXS), scanning electron microscopy (SEM), differential scanning calorimetry, and thermogravimetric analysis (DSC/TGA) were used to verify the synthesis of CuTi. This method effectively produced nanocrystalline CuTi. This study shows that the CuTi IMC may be synthesized from the binary Cu<sub>50</sub>Ti<sub>50</sub> by MA.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"189 ","pages":"Article 109117"},"PeriodicalIF":4.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145681997","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

Embrittlement after high-temperature exposure to air of a near-γ TiAl alloy 近γ TiAl合金高温暴露于空气后的脆化

IF 4.8 2区材料科学

Intermetallics Pub Date : 2026-02-01 Epub Date: 2025-12-11 DOI: 10.1016/j.intermet.2025.109108

Frederic Habiyaremye , Camille Thenot , Pierre Sallot , Daniel Monceau , Jean-Philippe Monchoux

{"title":"Embrittlement after high-temperature exposure to air of a near-γ TiAl alloy","authors":"Frederic Habiyaremye , Camille Thenot , Pierre Sallot , Daniel Monceau , Jean-Philippe Monchoux","doi":"10.1016/j.intermet.2025.109108","DOIUrl":"10.1016/j.intermet.2025.109108","url":null,"abstract":"<div><div>The loss of ductility of a Ti–48Al–2Cr–2Nb (at%) near-γ alloy after exposure to 80 % Ar–20 % O<sub>2</sub> at 700 °C for 1 h and 100 h has been investigated. In addition to marked decreases in ductility classically reported, increases in yield stress reaching +25 % have been observed. SIMS depth profiles enabled the determination of the <sup>18</sup>O isotope penetration depth via volume diffusion, which reached about 10 μm after 100 h of exposure. Site-specific lift–out by FIB, along with EBSD and TEM characterizations, were employed to examine the local transformations occurring in the diffusion zone and within the volume of exposed tensile specimens. In-situ TEM straining experiments were carried out on exposed and un-exposed specimens to study the influence of exposure on the microscopic mechanisms occurring in the bulk material. Results revealed the formation of chromium-rich precipitates and a recrystallized zone extending up to a depth of 15 μm from the surface after exposure. The dislocations in the subsurface layer were non-linear, likely due interactions between dislocation lines and oxygen solutes from the exposure atmosphere which potentially contribute to strengthening of the subsurface layer and ultimately to premature failure in this region. The elevated scattering in the in-situ TEM data did not allow to correlate the dislocation jump distances to the increase in yield stress.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"189 ","pages":"Article 109108"},"PeriodicalIF":4.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145733914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of friction and wear performance of laser additively manufactured AlCrFeNiMo high entropy alloy coating at temperatures from RT to 900 °C 激光增材制备AlCrFeNiMo高熵合金涂层在室温~ 900℃的摩擦磨损性能研究

IF 4.8 2区材料科学

Intermetallics Pub Date : 2026-02-01 Epub Date: 2025-12-26 DOI: 10.1016/j.intermet.2025.109136

Cuong Nguyen , Yingang Liu , Anh Kiet Tieu , Haiwei Chang , Xuan Thang Nguyen , Guanyu Deng , Mingxing Zhang , Huijun Li , Lihong Su

{"title":"Investigation of friction and wear performance of laser additively manufactured AlCrFeNiMo high entropy alloy coating at temperatures from RT to 900 °C","authors":"Cuong Nguyen , Yingang Liu , Anh Kiet Tieu , Haiwei Chang , Xuan Thang Nguyen , Guanyu Deng , Mingxing Zhang , Huijun Li , Lihong Su","doi":"10.1016/j.intermet.2025.109136","DOIUrl":"10.1016/j.intermet.2025.109136","url":null,"abstract":"<div><div>In this study, AlCrFeNiMo high-entropy alloy (HEA) coatings have been successfully fabricated by laser cladding method using the mixed elemental powders as the raw material. Two different laser powers (200 W for HEA1 and 350 W for HEA2) were used, aiming to investigate the influence of processing parameters on the phase constitution, microstructure and properties of as-cladded HEA coatings. It has been found that both AlCrFeNiMo HEA coating is consisted of BCC1, BCC2 and Mo-rich phases. HEA2 exhibited finer microstructure, reduced elemental segregation, and slightly higher hardness (833.3 HV) compared to HEA1 (808.6 HV). Tribological testing from room temperature to 900 °C showed that HEA2 consistently achieved lower friction coefficients and wear rates with lowest values of 0.29 and 0.68 × 10<sup>−5</sup> mm<sup>3</sup>/Nm at 900 °C, respectively. Cross-sectional and surface analyses revealed a transition from abrasive wear at room temperature to oxidative wear at 900 °C, with HEA2 forming a denser, stable tribo-oxide layer enriched in Al and Cr. These results highlight that optimizing laser processing enhances the microstructural integrity and high-temperature wear resistance of AlCrFeNiMo HEA coatings, making them promising for extreme service conditions.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"189 ","pages":"Article 109136"},"PeriodicalIF":4.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145836812","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

Unraveling the mechanism underlying hydrogen storage improvement in TiZrNbCrFe high-entropy alloy via (Ti,Nb)/(Cr,Fe) stoichiometric ratio control 通过控制(Ti,Nb)/(Cr,Fe)化学计量比揭示TiZrNbCrFe高熵合金储氢性能改善机理

IF 4.8 2区材料科学

Intermetallics Pub Date : 2026-02-01 Epub Date: 2025-11-26 DOI: 10.1016/j.intermet.2025.109053

Sibo Wang , Hongkui Zhang , Zhen Wen , Yue Li , Tong Zhang , Yingdong Qu , Guanglong Li

{"title":"Unraveling the mechanism underlying hydrogen storage improvement in TiZrNbCrFe high-entropy alloy via (Ti,Nb)/(Cr,Fe) stoichiometric ratio control","authors":"Sibo Wang , Hongkui Zhang , Zhen Wen , Yue Li , Tong Zhang , Yingdong Qu , Guanglong Li","doi":"10.1016/j.intermet.2025.109053","DOIUrl":"10.1016/j.intermet.2025.109053","url":null,"abstract":"<div><div>TiZrNbCrFe is mainly composed of C14 Laves phase and has good kinetic performance. However, due to the low content of BCC phase, the maximum hydrogen storage capacity of this alloy is relatively low. To address the issue of low maximum hydrogen storage capacity of alloys, in this paper, high-entropy alloys (TiNb)<sub>20+x</sub>Zr<sub>20</sub>(FeCr)<sub>20-x</sub> (x = 0,5,10,15) were prepared by adjusting the ratio of type a elements (Ti, Nb) to type b elements (Cr, Fe). The results show that the proportion of BCC phase increases from 21.34 % to 92.52 % by adding Ti and Nb elements. The active hydrogen absorption and peak hydrogen storage capacity of the alloy are the best when the proportion of BCC phase is 86.92 %, that is, Ti<sub>30</sub>Nb<sub>30</sub>Zr<sub>20</sub>Fe<sub>10</sub>Cr<sub>10</sub> alloy. The first activation hydrogen absorption capacity of this alloy is as high as 1.88 wt %, which is 1.29 wt % higher than that of TiZrNbCrFe alloy. When the hydrogen pressure is 3 MPa and the temperature is 100 °C, the saturated hydrogen absorption is 2.04 wt %, which is 0.9 wt % higher than that of TiZrNbCrFe alloy. With the increase of Ti and Nb content, the dehydrogenation temperature increases from 218 °C to 419 °C, the stability of the hydride increases, and the difficulty of dehydrogenation increases. This paper provides a design idea for the composition control of high-entropy hydrogen storage materials.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"189 ","pages":"Article 109053"},"PeriodicalIF":4.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145594871","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