Materials Characterization最新文献_第6页

X-ray diffraction pattern analysis of an aged Al-Cu-Mg-Ag alloy 老化铝铜镁银合金的 X 射线衍射图样分析

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-03-12 DOI: 10.1016/j.matchar.2025.114927

M.R. Gazizov , R. Holmestad , M.Yu. Gazizova , R.O. Kaibyshev

{"title":"X-ray diffraction pattern analysis of an aged Al-Cu-Mg-Ag alloy","authors":"M.R. Gazizov , R. Holmestad , M.Yu. Gazizova , R.O. Kaibyshev","doi":"10.1016/j.matchar.2025.114927","DOIUrl":"10.1016/j.matchar.2025.114927","url":null,"abstract":"<div><div>An approach to X-ray diffraction (XRD) pattern analysis for distinguishing the {111}<sub>Al</sub> plates, i.e., the Ω-phase in the Al-Cu-Mg-Ag alloys, from the structurally similar equilibrium θ-phase (Al<sub>2</sub>Cu) in the Al-Cu alloys has been developed. Three variants of the {111}<sub>Al</sub> plates (namely the Ω-phase) characterized in the Al-Cu-Mg-Ag alloys using transmission electron microscopy (TEM) were applied to construct and refine their structures by density functional theory (DFT). The XRD patterns were simulated using DFT supercells and a multi-purpose pattern-fitting system, RIETAN-FP. The {111}<sub>Al</sub> Ω plates are associated with the presence of the “strongest” peaks - 110<sub>θ</sub>, (or 220<sub>θ</sub>), 310<sub>θ</sub> and 202<sub>θ</sub>, if the precipitate is considered to be similar to the equilibrium θ-phase with the Vaughan II θ/Al orientation relationship. Other XRD peaks, e.g., 200<sub>θ</sub>, 002<sub>θ</sub>, 112<sub>θ</sub>, 222<sub>θ,</sub> 420<sub>θ</sub>, and 402<sub>θ</sub>, have reduced integral intensities or even disappear in the experimental patterns taken from the aged Al-Cu-Mg-Ag alloy. The increase of the integral intensity of the {310}<sub>θ</sub> and {202}<sub>θ</sub> relative to the {110}<sub>θ</sub> (or {220<sub>θ</sub>}) plane(s) on the XRD patterns occurs in the alloy after over-aging compared to peak-aging state. This was associated with the improvement of periodicity/ordering level within the Ω-phase structure during its plate thickening. The DFT model, composed of the hybrid precipitate including the orthorhombic θ- and hexagonal η-type phase fragments, fits better with the experimental pattern taken from the alloy after peak-aging, where these ∼1.6 nm thick {111}<sub>Al</sub> plates are actually predominant.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114927"},"PeriodicalIF":4.8,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628334","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

Formation mechanism of graphite or graphene fibers with core-shell structure from nearly stoichiometric polycrystalline SiC fibers 从近乎原子序数的多晶碳化硅纤维中形成具有核壳结构的石墨或石墨烯纤维的机理

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-03-11 DOI: 10.1016/j.matchar.2025.114930

Jing Chen , Zhongqian Zhao , Yutao He , Cuilan Wu , Yanzi Gou

{"title":"Formation mechanism of graphite or graphene fibers with core-shell structure from nearly stoichiometric polycrystalline SiC fibers","authors":"Jing Chen , Zhongqian Zhao , Yutao He , Cuilan Wu , Yanzi Gou","doi":"10.1016/j.matchar.2025.114930","DOIUrl":"10.1016/j.matchar.2025.114930","url":null,"abstract":"<div><div>SiC fibers are widely used in high-temperature structural composites as an important reinforcement. The nearly stoichiometric polycrystalline SiC fibers were subjected to various high temperatures under vacuum to study the formation mechanism of graphite/graphene fibers with core-shell structure. The results indicate that the graphite/graphene fibers consist of dense graphite shell and graphene core with porous 3-dimensional network structure, and the tensile strength of porous graphite/graphene fibers is about 254 MPa. The outermost graphite shell is oriented and the {0001}<sub>Graphite</sub> planes with large spacing are almost perpendicular to the surface of the fibers, which facilitates the release of gases. Graphite maintains a special orientation relationship of <1<span><math><mover><mn>1</mn><mo>¯</mo></mover></math></span>00 > <sub>Graphite</sub> // <1<span><math><mover><mn>1</mn><mo>¯</mo></mover></math></span>0 > <sub>β-SiC</sub> and {0001}<sub>Graphite</sub> // {111}<sub>β-SiC</sub> in the early nucleation stage. As the SiC fibers further decompose, the graphite grows and bends, and its orientation relationship with the β-SiC disappears. Instead, the graphite with the (0001)<sub>Graphite</sub> planes perpendicular to the non-{111}<sub>β-SiC</sub> interfaces shows a faster growth rate, higher quality and fewer defects. The volume fraction of the pores in the porous 3-dimensional network graphene core exceeds 55 %, and in some cases reaches 86 %. This characteristic not only reduces the weight of fibers but also increases the potential adsorption capacity of fibers. These findings elucidate the mechanism of decomposition of SiC fibers to form graphite/graphene fibers under high temperatures, offering valuable insights into the development of high-performance SiC fibers or porous graphite/graphene fibers.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114930"},"PeriodicalIF":4.8,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628332","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 evolution of massive and allotriomorphic ferrite in an interstitial-free steel subjected to cold-rolling and post-annealing

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-03-11 DOI: 10.1016/j.matchar.2025.114933

Yung-An Chen , Shih-Yuan Lu , Chien-Yu Tseng , Tzu-Ching Tsao , Yo-Lun Yang , Chih-Yuan Chen , Te-Cheng Su , Jer-Ren Yang

引用次数: 0

Reducing sensitivity of mechanical properties to assembly gap size in AA5083/TA5 dissimilar joints via a transverse alternating magnetic field in laser fusion brazing process

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-03-11 DOI: 10.1016/j.matchar.2025.114929

Yang Li, Chendong Shao, Maofu Zhang, Haichao Cui, Yaqi Wang, Xinhua Tang

{"title":"Reducing sensitivity of mechanical properties to assembly gap size in AA5083/TA5 dissimilar joints via a transverse alternating magnetic field in laser fusion brazing process","authors":"Yang Li, Chendong Shao, Maofu Zhang, Haichao Cui, Yaqi Wang, Xinhua Tang","doi":"10.1016/j.matchar.2025.114929","DOIUrl":"10.1016/j.matchar.2025.114929","url":null,"abstract":"<div><div>The achievement of high-quality AA5083/TA5 dissimilar butt joints via laser fusion brazing remains challenging due to the high sensitivity of microstructure and mechanical properties to process parameters. This study explores the effectiveness of a transverse alternating magnetic field (AMF) in reducing the adverse effects of assembly gap size on weld appearance, microstructure and mechanical properties of AA5083/TA5 laser fusion brazed butt joints. The results demonstrate that the magnetic field supports the molten pool and enhances wetting of aluminum alloy on the titanium plate. The stirring effect homogenizes the temperature field within the molten pool, resulting in an I-shaped transformation of aluminum weld and reduced angular deformation. Moreover, by generating a thermal electromagnetic force up to 10<sup>5</sup> Nm<sup>−3</sup> at the solidification interface, the alternating magnetic field breaks up large-sized dendrites and alters grain growth direction for both aluminum dendrites and TiAl<sub>3</sub> grains. Consequently, it increases dispersed heterogeneous nucleation TiAl<sub>3</sub> particles content within aluminum welds while refining their grain structure. Furthermore, this refinement inhibits the severe hot cracks in N_0.3 joint through synergistic effects with texture optimization. The mitigated nanomechanical property mismatches at phase interface strengthens the TiAl<sub>3</sub> interface. The tensile strength of joints decreases slightly from 280.75 MPa for W_0 joint to 268.48 MPa for W_0.3 joint, comparable to the N0 joint. This study demonstrates a promising approach for reducing the sensitivity of microstructure and mechanical properties to process parameters by applying a magnetic field during Al/Ti laser fusion brazing process.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114929"},"PeriodicalIF":4.8,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619165","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

Breaking strength-conductivity trade-off in nanotwinned Cu by Fe Co-electroplating and its thermal stability characterization

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-03-10 DOI: 10.1016/j.matchar.2025.114925

Dinh-Phuc Tran, Bo-Yan Chen, Mai-Phuong La, Kang-Ping Lee, Chih Chen

{"title":"Breaking strength-conductivity trade-off in nanotwinned Cu by Fe Co-electroplating and its thermal stability characterization","authors":"Dinh-Phuc Tran, Bo-Yan Chen, Mai-Phuong La, Kang-Ping Lee, Chih Chen","doi":"10.1016/j.matchar.2025.114925","DOIUrl":"10.1016/j.matchar.2025.114925","url":null,"abstract":"<div><div>Traditional metal alloying usually offers enhanced strength but generally reduces the conductivity. In this study, we prove that incorporating Fe ions can break the strength conductivity trade-off in electroplated nanotwinned copper (NT-Cu) foils. An enhancement of 13 %, from 758.6 MPa to 862.5 MPa was achieved. The microstructure, twin spacing, grain size, and orientation of the foils were analyzed using focused ion beam, transmission electron microscope, and electron backscattered diffraction. Additionally, linear sweep voltammetry analysis was performed to investigate the inhibitory effects of Fe ions. Results show that the strength-conductivity synergy is due to the grain/twin spacing refinement effect of Fe ions in the electrolyte. The presence of Fe ions suppresses the growth of Cu foils and increases the reduction overpotential leading to higher nucleus density (more nucleation sites during the initial stages of electrodeposition). Fe ions further refine the equiaxed grain structure producing ultrafine grains while preserving nanotwins within the Cu grains. The electroplated NT-Cu(Fe) foils also demonstrated good thermal stability and high electrical conductivity (85.4 %, international annealed Cu standard-IACS). This technique could widen new avenues for the development of the next generation of electrical interconnects.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114925"},"PeriodicalIF":4.8,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619209","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

Effect of standoff distance on interfacial characteristics and mechanical properties of Al/Cu MPW joints

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-03-10 DOI: 10.1016/j.matchar.2025.114926

M. Pourabbas, M. Aghaie-Khafri

{"title":"Effect of standoff distance on interfacial characteristics and mechanical properties of Al/Cu MPW joints","authors":"M. Pourabbas, M. Aghaie-Khafri","doi":"10.1016/j.matchar.2025.114926","DOIUrl":"10.1016/j.matchar.2025.114926","url":null,"abstract":"<div><div>In this work, Al6082-T6 to Copper were effectively joined by magnetic pulse welding (MPW). The interfacial characteristics and mechanical properties of joints were investigated at different standoff distances and constant input voltage by SEM, EDS, XRD analyses, microhardness and shear strength tests. SEM results showed that the various interface microstructures such as wakes, vortices, intermediate pocket/layer and porous structure were unveiled due to the diverse impact velocities. The XRD results from the fracture surface of the Cu side exhibited the formation of intermetallic compounds including Al<sub>2</sub>Cu, AlCu and Al<sub>4</sub>Cu<sub>9</sub> at standoff distances of 2.3, 3 and 4 mm which is caused by melting and subsequent accelerated element interdiffusion at the weld interface. Microhardness test results indicated the increased hardness of weld interface for all weld joints as a result of the work hardening of presence of the intermetallic compounds. Shear strength test results demonstrated that the highest shear forces are obtained as 12,300 and 13,500 N for weld made at standoff distances of 1.5 and 2.3 mm. These joints showed the failure of the base metal during shear test manifesting the adequate strength. Other weld samples had lower shear force and revealed failure of the weld zone owing to the presence of microcracks, pores, cavities and unbonded areas at the weld interface. Fractography analyses disclosed the appearance of large dimple area and small brittle area in fracture surface for standoff distance of 3 mm. Also, at standoff distance of 4 mm, splash droplets were observed in fracture surface suggesting the melting and evaporation of aluminum.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114926"},"PeriodicalIF":4.8,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619145","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

Local substructure characterization of nanoindented additively manufactured Ti6242 alloy using STEM and EBSD

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-03-10 DOI: 10.1016/j.matchar.2025.114921

Atasi Ghosh, Anjali Gawande, Sureddy Tejanath Reddy

{"title":"Local substructure characterization of nanoindented additively manufactured Ti6242 alloy using STEM and EBSD","authors":"Atasi Ghosh, Anjali Gawande, Sureddy Tejanath Reddy","doi":"10.1016/j.matchar.2025.114921","DOIUrl":"10.1016/j.matchar.2025.114921","url":null,"abstract":"<div><div>Understanding the correlation between the local phase chemistry and local deformation behavior in response to the local plastic strain gradient under the indentation tip is crucial for optimizing the alloy performance in additive manufactured (AM) Ti alloys. This study investigates the nanoindentation response of Ti-6Al-2Sn-4Zr-2Mo (Ti6242) alloy fabricated via Laser Powder Bed Fusion (LPB) and Directed Energy Deposition (DED), focusing on phase chemistry, microstructural evolution, and their role in mechanical response. Advanced characterization using Scanning Transmission Electron Microscopy (STEM), Electron Backscatter Diffraction (EBSD), and Atom Probe Tomography (APT) reveals distinct substructural features governing the dynamic deformation response. The DED sample exhibits a combination of the unique dislocation substructure at the interphase boundary leading to faulted bands within the primary alpha. On the other hand, the presence of nanotwins, orthorhombic martensite phase and modulated lattice structure of the weakly textured beta phase controls the deformation in the LPB sample. It reduces the plastic strain gradient during nanoindentation in the LPB sample resulting in its insensitivity to the indentation size effect as opposed to the DED sample. Thus, the findings highlight the role of local phase heterogeneity in tailoring mechanical properties for high-performance application of AM Ti6242 alloy.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114921"},"PeriodicalIF":4.8,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143601609","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 silicon content on the phase composition, microstructure evolution and oxidation resistance of Al-Si coatings on Mo substrate

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-03-10 DOI: 10.1016/j.matchar.2025.114923

Tao Fu, Chunyin Zhang, Yingyi Zhang, Shuren Zhan, Junjie Zhu

{"title":"Effects of silicon content on the phase composition, microstructure evolution and oxidation resistance of Al-Si coatings on Mo substrate","authors":"Tao Fu, Chunyin Zhang, Yingyi Zhang, Shuren Zhan, Junjie Zhu","doi":"10.1016/j.matchar.2025.114923","DOIUrl":"10.1016/j.matchar.2025.114923","url":null,"abstract":"<div><div>The pure Al and Al-Si coatings with different Si contents are prepared on Mo substrate using hot dip method. The effects of Si content on the phase composition, microstructure evolution and oxidation resistance of various coatings are systematically investigated. The results indicate that the pure Al coating is mainly consists of an Al<sub>4</sub>Mo layer and an Al<sub>8</sub>Mo<sub>3</sub> interface layer, and the Al-Si coatings are made up of Mo(Si,Al)<sub>2</sub> layer and Al-Si alloy layer. The oxidation resistance of Al-Si coating is significantly higher than that of Al coating, and the service life of former is 5 and 2 times that of latter under oxidation atmosphere of 900 °C and 1200 °C, respectively. The selective oxidation of Al and Si elements makes the Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> oxide layer generated on the surface of Al-Si coating more complex and dense than the single Al<sub>2</sub>O<sub>3</sub> oxide layer on the Al coating surface, which to some extent alleviates the oxidation of Mo element. Furthermore, the average grain area of Mo(Si, Al)<sub>2</sub> (0.14–0.56 μm<sup>2</sup>) is much smaller than that of Al<sub>4</sub>Mo (1.33 μm<sup>2</sup>), which makes the Al-Si coating have a denser structure than the Al coating. Compared with Al-20Si and Al-30Si coatings, Al-10Si coatings under the same exposure conditions have lower surface roughness and smaller mass changes per unit area, which is mainly attributed to its smaller grains, smoother surface and thicker coating thickness.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114923"},"PeriodicalIF":4.8,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143631958","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

Comprehending interface shearing behavior within a bulk Cu-Nb alloy using micromechanical testing

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-03-10 DOI: 10.1016/j.matchar.2025.114928

Tanvi Ajantiwalay , Farhan Ishrak , Aniruddha Malakar , Mayur Pole , Lei Li , Ayoub Soulami , Xiaolong Ma , Mark Wirth , Arun Devaraj , Bharat Gwalani

{"title":"Comprehending interface shearing behavior within a bulk Cu-Nb alloy using micromechanical testing","authors":"Tanvi Ajantiwalay , Farhan Ishrak , Aniruddha Malakar , Mayur Pole , Lei Li , Ayoub Soulami , Xiaolong Ma , Mark Wirth , Arun Devaraj , Bharat Gwalani","doi":"10.1016/j.matchar.2025.114928","DOIUrl":"10.1016/j.matchar.2025.114928","url":null,"abstract":"<div><div>Understanding the deformation mechanisms behind microstructural evolution during shear loading has been a long-standing area of interest. However, establishing a connection between microstructure, mechanical properties, and the extent of shear deformation is challenging and requires refined experimental approaches. Micro-shear testing offers a controlled method to introduce shear into small volumes of material, allowing for detailed site-specific microstructural characterization. In this work, we investigated the shear deformation behavior and properties of copper (Cu) matrix and at copper‑niobium (Cu-Nb) interfaces using micro-shear testing. The yielding under shear loading is dependent on the orientation of the interfaces. Intuitively, when the interface is along the shear direction, the flow stresses are lower compared to when it is across. Transmission electron microscopy examination shows stacking faults and high dislocation density dominating the deformation on the Cu side while limited dislocation activity in the neighboring Nb crystal. Moreover, an amorphous layer was observed at the Cu-Nb interface which likely formed after shear deformation. In summary, our study provides an understanding of the shear deformation behavior of phase-interfaces in an immiscible system at a micro-scale. The focus of the paper is demonstrating the applicability of the S-shaped pillar geometry for local shear measurements and deformation of specifically oriented interface boundaries.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114928"},"PeriodicalIF":4.8,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143629347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of in-situ formed multi-carbides on the microstructure and wear resistance of AlCoCrFeNi-based high entropy alloy laser cladded coatings

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-03-10 DOI: 10.1016/j.matchar.2025.114918

Wei Zhao , Qi Ma , Baoshuai Du , Hui Zhang , Yuexia Lv , Shuai Liu , Weifeng Rao

{"title":"Effect of in-situ formed multi-carbides on the microstructure and wear resistance of AlCoCrFeNi-based high entropy alloy laser cladded coatings","authors":"Wei Zhao , Qi Ma , Baoshuai Du , Hui Zhang , Yuexia Lv , Shuai Liu , Weifeng Rao","doi":"10.1016/j.matchar.2025.114918","DOIUrl":"10.1016/j.matchar.2025.114918","url":null,"abstract":"<div><div>In this study, in-situ formed multi-carbides (NbTiZr)C reinforced AlCoCrFeNi high entropy alloy composite coatings were prepared on the surface of Q235 steel using laser cladding technology. These coatings were compared with those reinforced by binary carbides NbC, TiC and ZrC. Microstructural analysis revealed that all coatings comprised a BCC matrix phase interspersed with dendritic carbide phases. The multi-carbides (NbTiZr)C were successfully synthesized during the laser cladding process. Compared to coatings containing individual in-situ NbC, TiC, and ZrC, the multi-carbides exhibited significantly refined grain sizes, measuring only 41 %–83 % of the grain size observed in other coatings. The primary wear mechanism at room temperature for all coatings was identified as abrasive wear. The disordered lattice structure of the multi-carbides effectively enhanced resistance to uneven dislocation propagation, improving their ability to resist micro-cutting. Additionally, the refined carbide size effectively suppressed crack initiation sensitivity, thereby reducing the brittleness of the coating. As a result, the wear resistance of the multi-carbides reinforced coating was approximately 1.44–2.89 times higher than that of the other coatings. At high temperature of 800 °C, the dominant wear mechanisms were abrasive wear and oxidation wear. The multi-carbides reinforced coating was capable of forming a composite protective film with a gradient composition on the wear surface, which provided improved lubricity and self-healing properties. This effectively reduced the high-temperature wear rate, yielding a wear resistance approximately 2.13–2.97 times higher than that of other coatings.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114918"},"PeriodicalIF":4.8,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619162","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