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Mechanochemical synthesis of Ni3Al nano-alloy Ni3Al纳米合金的机械化学合成
IF 4.3 2区 材料科学
Intermetallics Pub Date : 2025-07-08 DOI: 10.1016/j.intermet.2025.108905
M. Mohammadi, S.A. Kahani
{"title":"Mechanochemical synthesis of Ni3Al nano-alloy","authors":"M. Mohammadi,&nbsp;S.A. Kahani","doi":"10.1016/j.intermet.2025.108905","DOIUrl":"10.1016/j.intermet.2025.108905","url":null,"abstract":"<div><div>The nickel aluminide nanoalloy was synthesized by chemical reduction of nickel(II) chloride hexahydrate salt by aluminum nanoparticles under basic (S1) and acidic (S2) conditions in the solid-state reaction. Aluminum nanoparticles were prepared by a novel wire drawing method in the presence of lubricating oil. Analysis of products (S1) and (S2) show that the prepared samples have different fraction component of compounds, morphologies, particle size and magnetic properties. The products were characterized by IR, XRD, FESEM, and VSM. The absorption bands do not appear in FTIR spectra of products (S1) and (S2) while, the spectra of precursors show all the absorption bands of nickel(II) chloride hexahydrate salt. The X-ray diffraction pattern results show the presence of three phases unreacted aluminum, metallic nickel and Ni<sub>3</sub>Al nano-alloy in products. The weight fraction of Ni<sub>3</sub>Al nanoparticles is calculated by the Rietveld method. Quantitative XRD analysis of (S1) shows a weight fraction of 33.90 % Ni<sub>3</sub>Al, 61.19 % metallic nickel and unreacted aluminum 4.90 % also, calculation in (S2) shows weight fraction Ni<sub>3</sub>Al, metallic nickel and unreacted aluminum 19.75, 77.83 and 2.42 % respectively. FESEM image of S1 and S2 show particles size distribution in the region 11–17 nm and 40–150 nm respectively. The hysteresis loop of S1 and S2 show magnetic saturation 7. 90 emu/g and 17.04 emu/g respectively.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108905"},"PeriodicalIF":4.3,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144579955","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
Characterization of residual stress and its effect on mechanical properties of nickel–based single crystal superalloys by nanoindentation 纳米压痕法表征镍基单晶高温合金残余应力及其对力学性能的影响
IF 4.3 2区 材料科学
Intermetallics Pub Date : 2025-07-07 DOI: 10.1016/j.intermet.2025.108911
Xinkuo Ji , Chenfei Song , Gesheng Xiao , Huanhuan Lu , Zhidan Zhou
{"title":"Characterization of residual stress and its effect on mechanical properties of nickel–based single crystal superalloys by nanoindentation","authors":"Xinkuo Ji ,&nbsp;Chenfei Song ,&nbsp;Gesheng Xiao ,&nbsp;Huanhuan Lu ,&nbsp;Zhidan Zhou","doi":"10.1016/j.intermet.2025.108911","DOIUrl":"10.1016/j.intermet.2025.108911","url":null,"abstract":"<div><div>Different indenters are used to measure the magnitude of residual compressive stress and characterize the influence of compressive residual stress on the mechanical response of nickel–based single crystal superalloy. Based on the reduced modulus obtained by a cylindrical flat punch indenter, the indentation hardness and actual projected contact area of the pyramidal indenter at loading segment are calculated, which avoid the effect of indentation sinking–in or piling–up. Furthermore, according to the Nix–Gao model and actual projected contact area, the indentation load–depth curves of the pyramidal indenter at loading segment can be reconstructed, which are not affected by the indentation size effect. Based on the corrected indentation load–depth curves, the magnitude of residual compressive stress is calculated according to the difference in the loading work of the pyramidal indenter, and verified by the calculation results of David's model. It is found that the elastic modulus and reduced modulus are not affected by the residual compressive stress; the indentation hardness, slope of the contact stiffness – depth curve and contact area show an increasing regime as residual compressive stress increases; residual compressive stress enhances the ability of NBSX to resist creep and plastic deformation.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108911"},"PeriodicalIF":4.3,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144571156","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
Near room temperature magnetocaloric effect in Co: LaFe13−xSix ribbons through melt Spinning: Boosting δTFWHM and Curie temperature 熔体纺丝Co: LaFe13−x6条带的近室温磁热效应:提高δTFWHM和居里温度
IF 4.3 2区 材料科学
Intermetallics Pub Date : 2025-07-07 DOI: 10.1016/j.intermet.2025.108896
Anjana Vinod , D. Arvindha Babu , W. Madhuri
{"title":"Near room temperature magnetocaloric effect in Co: LaFe13−xSix ribbons through melt Spinning: Boosting δTFWHM and Curie temperature","authors":"Anjana Vinod ,&nbsp;D. Arvindha Babu ,&nbsp;W. Madhuri","doi":"10.1016/j.intermet.2025.108896","DOIUrl":"10.1016/j.intermet.2025.108896","url":null,"abstract":"<div><div>We report the development of high-performance cobalt-doped lanthanum iron silicon (<em>La-Fe-Co-Si</em>) alloys, synthesized via rapid solidification and short annealing, exhibiting optimal magnetic properties for magnetic refrigeration applications. The structural and microstructural analysis reveals a predominant cubic <span><math><mrow><mi>N</mi><mi>a</mi><msub><mrow><mi>Z</mi><mi>n</mi></mrow><mn>13</mn></msub></mrow></math></span>-type phase, corresponding to <span><math><mrow><mi>L</mi><mi>a</mi><msub><mrow><mo>(</mo><mrow><mi>F</mi><mi>e</mi><mo>,</mo><mi>S</mi><mi>i</mi></mrow><mo>)</mo></mrow><mn>13</mn></msub></mrow></math></span>, a material paradigmatic of superior magnetocaloric performance, thereby underscoring its potential for efficacious room-temperature magnetic refrigeration. However, Magnetization studies demonstrate a monotonic increase in Curie transition temperature with Co content, tunable to room temperature. The alloys exhibit a significant change in entropy <span><math><mrow><mo>(</mo><mo>−</mo><mo>Δ</mo><msub><mi>S</mi><mi>M</mi></msub></mrow></math></span>),2.70–3.99 <span><math><mrow><mfrac><mi>J</mi><mrow><mi>k</mi><mi>g</mi><mo>.</mo><mi>K</mi></mrow></mfrac></mrow></math></span> at 2.5 <em>T</em>, with a wide half-height width (39–45 <em>K</em>) and notable relative cooling power (108–156 <span><math><mrow><mfrac><mi>J</mi><mrow><mi>k</mi><mi>g</mi></mrow></mfrac></mrow></math></span>). Critical exponent analysis confirms a second-order phase transition. Our findings demonstrate the feasibility of producing Co-doped <span><math><mrow><mi>L</mi><mi>a</mi><msub><mrow><mo>(</mo><mrow><mi>F</mi><mi>e</mi><mo>,</mo><mi>S</mi><mi>i</mi></mrow><mo>)</mo></mrow><mn>13</mn></msub></mrow></math></span> alloys with near-room-temperature transition and large <span><math><mrow><mo>−</mo><mo>Δ</mo><msub><mi>S</mi><mi>M</mi></msub></mrow></math></span> through alloy design and melt-spinning processing, offering promising candidates for magnetic refrigeration applications.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108896"},"PeriodicalIF":4.3,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144571155","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
Silicon effects on the formation of heterogeneous intermetallic compound phases in Cu-Ni-Si(-Mn) alloys under homogenization treatment 硅对Cu-Ni-Si(-Mn)合金中非均质金属间化合物相形成的影响
IF 4.3 2区 材料科学
Intermetallics Pub Date : 2025-07-05 DOI: 10.1016/j.intermet.2025.108913
Hyun Woo Jeong , Ji Yong Shin , Se Hun Kwon , Hidemi Kato , Eun-Ae Choi , Seung Zeon Han
{"title":"Silicon effects on the formation of heterogeneous intermetallic compound phases in Cu-Ni-Si(-Mn) alloys under homogenization treatment","authors":"Hyun Woo Jeong ,&nbsp;Ji Yong Shin ,&nbsp;Se Hun Kwon ,&nbsp;Hidemi Kato ,&nbsp;Eun-Ae Choi ,&nbsp;Seung Zeon Han","doi":"10.1016/j.intermet.2025.108913","DOIUrl":"10.1016/j.intermet.2025.108913","url":null,"abstract":"<div><div>This study investigates the role of silicon in the formation and evolution of heterogeneous intermetallic compound phases in Cu-Ni-Si(-Mn) alloys subjected to homogenization treatment at 980 °C. Si plays a critical role in both the intragranular and grain boundary precipitation behavior. An increase in Si content significantly enhances the volume fraction and size of intragranular δ-Ni<sub>2</sub>Si precipitates. Furthermore, it promotes morphological changes at the grain boundaries, increasing the aspect ratio of boundary precipitates and transforming them into thin, film-like G-phase structures (Mn<sub>6</sub>Ni<sub>16</sub>Si<sub>7</sub>) in Mn-containing alloys. While the overall volume fraction of grain boundary phases remains relatively stable, these Si-induced morphological changes alter the grain boundary characteristics and impact mechanical performance. In Mn-free Cu-Ni-Si alloys, higher Si content leads to the coarsening of grain boundary δ-Ni<sub>2</sub>Si precipitates, degrading both strength and ductility. In contrast, in Mn-containing alloys, the grain boundary G-phase remains stable without coarsening, even with increased Si content, which helps retain ductility (∼10 %) and enhances overall mechanical properties. These findings highlight Si as a key element in tailoring microstructures and optimizing the mechanical performance of Cu-Ni-Si(-Mn) alloys through control of intermetallic phase formation.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108913"},"PeriodicalIF":4.3,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144563280","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
Fatigue-induced microstructural deformation and multimode defect-assisted cracking of laser powder bed fused superalloy at 650 °C 650℃激光粉末床熔合高温合金疲劳诱导的显微组织变形和多模缺陷辅助开裂
IF 4.3 2区 材料科学
Intermetallics Pub Date : 2025-07-03 DOI: 10.1016/j.intermet.2025.108907
Chuanwen Sun , Wei Li , Ahmad Serjouei , Xiaobo Cao , Cheng Li , Rui Sun , Xiaolong Li
{"title":"Fatigue-induced microstructural deformation and multimode defect-assisted cracking of laser powder bed fused superalloy at 650 °C","authors":"Chuanwen Sun ,&nbsp;Wei Li ,&nbsp;Ahmad Serjouei ,&nbsp;Xiaobo Cao ,&nbsp;Cheng Li ,&nbsp;Rui Sun ,&nbsp;Xiaolong Li","doi":"10.1016/j.intermet.2025.108907","DOIUrl":"10.1016/j.intermet.2025.108907","url":null,"abstract":"<div><div>Multi-scale characterization was conducted to investigate the interior failure behavior of a laser powder bed fused (LPBF) nickel-based superalloy under fatigue cyclic loading at operating temperature of 650 °C. The results reveal a shift in crack nucleation sites with increasing fatigue life–from additive manufacturing defects to crystallographic facets. Six distinct interior fatigue failure modes were identified, each involving defect-assisted crack nucleation surrounded by faceted features. Microcracks preferentially propagated in a transgranular fracture mode under localized shear stress, leading to grain fracture and facet formation. Variations in grain orientation influenced local fracture behavior, resulting in the formation of highly uneven facets. Competition between surface, subsurface and interior crack nucleation modes was observed, particularly at lower stress levels, indicating a transition in dominant fatigue mechanisms. At elevated temperatures, facet cracking was driven by a synergistic mechanism involving anti-phase boundary shearing, precipitate bypassing, and stacking fault shearing. These findings advance the understanding of defect-microstructure interactions and provide a basis for improving fatigue life prediction and design strategies for high-temperature LPBF components.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108907"},"PeriodicalIF":4.3,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144548884","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
Impact of heavy warm-rolling on microstructure and properties of an extremely low stacking fault energy high entropy alloy 重温轧制对极低层错能高熵合金组织和性能的影响
IF 4.3 2区 材料科学
Intermetallics Pub Date : 2025-06-30 DOI: 10.1016/j.intermet.2025.108903
S. Paul , R. Saha , P.P. Bhattacharjee
{"title":"Impact of heavy warm-rolling on microstructure and properties of an extremely low stacking fault energy high entropy alloy","authors":"S. Paul ,&nbsp;R. Saha ,&nbsp;P.P. Bhattacharjee","doi":"10.1016/j.intermet.2025.108903","DOIUrl":"10.1016/j.intermet.2025.108903","url":null,"abstract":"<div><div>This research focused on the influence of heavy (∼90 % reduction in thickness) warm-rolling (WR) on the microstructure, texture, and mechanical properties of an extremely low stacking fault energy (SFE) Co<sub>20</sub>Cr<sub>26</sub>Fe<sub>20</sub>Mn<sub>20</sub>Ni<sub>14</sub> high entropy alloy (HEA). The findings were further contextualized by comparing the results with heavy cold- (CR)/cryo-rolled (CryoR) low SFE alloys suitably. The WR was carried out at 650 °C up to 90 % thickness reduction, resulting in the formation of various microstructural features like dislocation cells (sub-structures), deformation twins, shear bands, precipitation of Cr-rich σ-phase, and a deformation-driven banded nanostructure with a remarkably fine inter-lamellar spacing of 130 ± 30 nm. Additionally, WR led to the development of a predominant brass-type texture. Annealing resulted in fully recrystallized fine microstructures up to 950 °C due to the presence of σ precipitates inhibiting grain growth; however, beyond which, the precipitates were dissolved and stimulated significant grain growth. The annealing textures showed the retention of weak α-fiber (ND//&lt;110&gt;) components and a high-volume fraction of random components, presumably due to the absence of dominating preferential nucleation or preferential growth mechanisms. An appreciable balance in strength-ductility (∼1 GPa-20 %) was achieved in the WR-processed HEA due to fine recrystallized grain size and large fraction of in-grain precipitates, which compared favorably with several other HEAs. Therefore, WR could be an attractive processing strategy for engineering the microstructure and properties of the low SFE HEAs.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108903"},"PeriodicalIF":4.3,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144517421","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
Atomic scale insights into super-nano dual-phase amorphous-nanocrystalline iron with synergistic high strength-plasticity 具有协同高强塑性的超纳米双相非晶-纳米晶铁的原子尺度研究
IF 4.3 2区 材料科学
Intermetallics Pub Date : 2025-06-28 DOI: 10.1016/j.intermet.2025.108902
Lusheng Wang , Long Luo , Liang Shen , Hao Liu , Jun Ding , Yu Tian , Siliang Yan
{"title":"Atomic scale insights into super-nano dual-phase amorphous-nanocrystalline iron with synergistic high strength-plasticity","authors":"Lusheng Wang ,&nbsp;Long Luo ,&nbsp;Liang Shen ,&nbsp;Hao Liu ,&nbsp;Jun Ding ,&nbsp;Yu Tian ,&nbsp;Siliang Yan","doi":"10.1016/j.intermet.2025.108902","DOIUrl":"10.1016/j.intermet.2025.108902","url":null,"abstract":"<div><div>To reveal the mechanical properties and plastic deformation mechanisms of super-nano dual-phase iron at the atomic scale, molecular dynamics models of amorphous iron (amorphous-Fe), nanocrystalline iron (NC-Fe), super-nano dual-phase amorphous-nanocrystalline iron (SNDP-A/NC-Fe), and super-nano dual-phase nanocrystalline-amorphous iron (SNDP-NC/A-Fe) were established. The results indicate super-nano dual-phase nanostructures have exhibit good strength-plasticity balance. The plasticity of SNDP-A/NC-Fe model exceeds that of amorphous-Fe with higher strength. The strength of SNDP-NC/A-Fe model is higher than that of the NC Fe model with excellent plasticity. The relatively uniform stress distribution leads to the good plasticity of SNDP-A/NC-Fe models owing to the suppression of nanocrystalline on shear band propagation. Additionally, the body-centered cubic (BCC) → face-centered tetragonal (FCT) phase transition lead to the reduction of strength, while the twinning behavior leads to a reduction in plasticity owing to the propagation of mature shear bands. This study has revealed the mechanical properties and plastic deformation mechanisms of body-centered cubic super-nano dual-phase structural materials at the atomic scale, providing a theoretical foundation for the design and application of low-activation steels with high strength and toughness.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108902"},"PeriodicalIF":4.3,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144502331","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 Nb addition on the damping capacity and mechanical properties of NbxCoCrFeNi2Al0.3 high-entropy alloys Nb加入对NbxCoCrFeNi2Al0.3高熵合金阻尼性能和力学性能的影响
IF 4.3 2区 材料科学
Intermetallics Pub Date : 2025-06-28 DOI: 10.1016/j.intermet.2025.108901
Yaqing Li, Aoxiang Li, Kaiwen Kang, Jinshan Zhang, Di Huang, Chunning Che, Borui Zhang, Saike Liu, Mingkun Xu, Yiteng Jiang, Gong Li
{"title":"Effects of Nb addition on the damping capacity and mechanical properties of NbxCoCrFeNi2Al0.3 high-entropy alloys","authors":"Yaqing Li,&nbsp;Aoxiang Li,&nbsp;Kaiwen Kang,&nbsp;Jinshan Zhang,&nbsp;Di Huang,&nbsp;Chunning Che,&nbsp;Borui Zhang,&nbsp;Saike Liu,&nbsp;Mingkun Xu,&nbsp;Yiteng Jiang,&nbsp;Gong Li","doi":"10.1016/j.intermet.2025.108901","DOIUrl":"10.1016/j.intermet.2025.108901","url":null,"abstract":"<div><div>A comprehensive investigation was conducted on Nb<sub><em>x</em></sub>CoCrFeNi<sub>2</sub>Al<sub>0.3</sub> (<em>x</em> = 0.05, 0.10, 0.15) high-entropy alloys (HEAs), focusing on their phase evolution, microstructural characteristics, damping behavior, and mechanical properties as functions of Nb content. Microstructural analysis confirmed a dual-phase constitution in the alloy system, comprising a face-centered cubic (FCC) matrix as the primary phase with dispersed Laves phase precipitates serving as the secondary phase. As the Nb molar ratio increased from <em>x</em> = 0.05 to 0.15, the volume fraction of the Laves phase exhibited a significant increasing trend, rising from 1.8 vol% to 9.0 vol%. Performance tests demonstrated that the Nb<sub>0.15</sub>CoCrFeNi<sub>2</sub>Al<sub>0.3</sub> alloy exhibited outstanding damping capacity of up to 0.055 at a strain amplitude of 3.2 × 10<sup>−4</sup>, while maintaining excellent mechanical properties. This optimized combination of damping capacity and mechanical properties enables the alloy not only to compete with conventional high-damping alloys but even to surpass them in certain key performance indicators.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108901"},"PeriodicalIF":4.3,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144502334","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 for obtaining values of thermomechanical processing parameters of high-entropy alloys with desirable strength and ductility 利用机器学习获得具有理想强度和延展性的高熵合金的热力加工参数值
IF 4.3 2区 材料科学
Intermetallics Pub Date : 2025-06-27 DOI: 10.1016/j.intermet.2025.108892
Zolfaghar Ali Akhlaghi , Hamed Shahmir , Ahmad Reza Sharafat
{"title":"Machine learning for obtaining values of thermomechanical processing parameters of high-entropy alloys with desirable strength and ductility","authors":"Zolfaghar Ali Akhlaghi ,&nbsp;Hamed Shahmir ,&nbsp;Ahmad Reza Sharafat","doi":"10.1016/j.intermet.2025.108892","DOIUrl":"10.1016/j.intermet.2025.108892","url":null,"abstract":"<div><div>Machine learning offers a promising and cost-effective approach to optimize thermomechanical processing and inverse design of high-entropy alloys. To obtain values of thermomechanical processing parameters including thickness reduction during rolling together with post-deformation annealing temperature and time of an equiatomic CoCrFeNiMn high-entropy alloy with desirable strength and ductility, we use neural networks for which and apply data augmentation techniques to enhance learning and performance. Besides, the performance of various other techniques, such as linear regression, k-nearest neighbors, decision trees, and ensemble models (random forest, bagging, gradient boosting, XGBoost, AdaBoost) were compared with that of neural networks. The results show that neural networks achieve superior performance, namely, an average MAPE of 8 % and an average R-squared of 91 %. The neural network was experimentally validated for three samples with target yield strengths of 450 MPa, 650 MPa, and 800 MPa, which resulted in actual values of 415 ± 22 MPa, 620 ± 31 MPa, and 745 ± 38 MPa, respectively, with uniform elongations closely matching the target of 15 %. The results demonstrate the potential of machine learning in neural networks for obtaining the values of processing parameters for high-performance new alloys.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108892"},"PeriodicalIF":4.3,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144489775","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
Enhanced microstructure and properties of laser cladding CoCrNi medium-entropy alloy reinforced with W W增强激光熔覆CoCrNi中熵合金的显微组织与性能
IF 4.3 2区 材料科学
Intermetallics Pub Date : 2025-06-26 DOI: 10.1016/j.intermet.2025.108895
Xuanze Yang, Meiyan Feng, Changrong Chen, Guofu Lian
{"title":"Enhanced microstructure and properties of laser cladding CoCrNi medium-entropy alloy reinforced with W","authors":"Xuanze Yang,&nbsp;Meiyan Feng,&nbsp;Changrong Chen,&nbsp;Guofu Lian","doi":"10.1016/j.intermet.2025.108895","DOIUrl":"10.1016/j.intermet.2025.108895","url":null,"abstract":"<div><div>To explore the regulatory mechanism of the W element on the microstructure properties of laser cladding CoCrNi medium-entropy alloy, CoCrNiW<em>x</em> (<em>x</em> = 0, 0.15, 0.3, 0.45, 0.6) medium-entropy alloy coatings with a gradient change in W content were fabricated on an AISI 1045 steel substrate. The microstructure of the coating shows that when <em>x</em> = 0, the coating presents a single FCC solid solution structure. When <em>x</em> &gt; 0, μ phase intermetallic compounds precipitated in the coating, forming a biphase structure of FCC + μ phase. Microhardness testing revealed an upward trend in the microhardness of the CoCrNiW<em>x</em> coatings with increasing W content. Specifically, the W<sub>0.6</sub> coating has the highest average microhardness, attaining 351.59 HV<sub>0.5</sub>, which is 1.84 times that of the W<sub>0</sub> coating. The wear resistance of the coatings is significantly improved with the addition of W. The average friction coefficient decreases from 0.774 to 0.598, and the wear volume reduces from 0.0673 to 0.0237 mm<sup>3</sup>. The wear mechanisms mainly include adhesive wear, abrasive wear, accompanied by oxidative wear. Electrochemical tests conducted in a 3.5 wt% NaCl solution demonstrated that W<sub>0.6</sub> has the highest self-corrosion potential (−0.460 V) and the lowest self-corrosion current (7.245 × 10<sup>−7</sup> A/cm<sup>2</sup>), displaying optimal passivation behavior in the electrolyte. The research results provide a reference for the development of medium-entropy alloy coatings with excellent comprehensive properties.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"185 ","pages":"Article 108895"},"PeriodicalIF":4.3,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144481805","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
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