Materials Characterization最新文献

Study on correlation between mechanical properties and micro/nano-structure of Sm2Co17-type permanent magnets

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-03-14 DOI: 10.1016/j.matchar.2025.114934

Chuanghui Dong , Fangqin Hu , Jiabin Wang , Sidi Wang , Bo Zhou , Lei Liu , Yingli Sun , Yong Ding , Aru Yan

{"title":"Study on correlation between mechanical properties and micro/nano-structure of Sm2Co17-type permanent magnets","authors":"Chuanghui Dong , Fangqin Hu , Jiabin Wang , Sidi Wang , Bo Zhou , Lei Liu , Yingli Sun , Yong Ding , Aru Yan","doi":"10.1016/j.matchar.2025.114934","DOIUrl":"10.1016/j.matchar.2025.114934","url":null,"abstract":"<div><div>Sm<sub>2</sub>Co<sub>17</sub>-type permanent magnets are extensively utilized in high-temperature applications due to their exceptional magnetic properties and thermal stability. However, their poor mechanical properties increase manufacturing costs and shorten their operational lifespan. In this work, we have investigated the intricate relationship between the mechanical properties and the micro/nano-structure within Sm<sub>2</sub>Co<sub>17</sub>-type magnets. We found that a magnet characterized by small grain size, grain boundaries enriched with a Cu-rich phase, and a fine and complete cellular nanostructure within the grains exhibit excellent flexural strength. At the micro-scale, the grain refinement effectively prevents crack propagation. Additionally, the Cu-rich phase enhances the inter-grain bonding and strengthens grain boundaries. At the nano-scale, the development of fine and uniform cellular nanostructure within the grains further amplifies the magnet's superior mechanical properties by facilitating more uniform stress distribution and enhanced resistance to deformation. These findings have the potential to guide the optimization of the mechanical properties of Sm<sub>2</sub>Co<sub>17</sub>-type magnets.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114934"},"PeriodicalIF":4.8,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654620","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

Low-temperature brazing of SiCp/Al composites with Bi2O3-B2O3-ZnO-SiO2-Al2O3 glass in air

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-03-13 DOI: 10.1016/j.matchar.2025.114932

Duo Liu , Rui Jiang , Yanyu Song , Naibin Chen , Tao Wang , Hong Bian , Wei Fu , Baoqiang Wang , Xiaoguo Song

{"title":"Low-temperature brazing of SiCp/Al composites with Bi2O3-B2O3-ZnO-SiO2-Al2O3 glass in air","authors":"Duo Liu , Rui Jiang , Yanyu Song , Naibin Chen , Tao Wang , Hong Bian , Wei Fu , Baoqiang Wang , Xiaoguo Song","doi":"10.1016/j.matchar.2025.114932","DOIUrl":"10.1016/j.matchar.2025.114932","url":null,"abstract":"<div><div>In this study, low-melting Bi<sub>2</sub>O<sub>3</sub>-B<sub>2</sub>O<sub>3</sub>-ZnO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> (BBZSA) glass was adopted to braze SiC<sub>p</sub>/Al composite, and the effects of brazing temperature and holding time on the microstructure and mechanical properties of the SiC<sub>p</sub>/Al joint were investigated. The BBZSA glass started to spread and wet on the surface of SiC<sub>p</sub>/Al composite at the temperature of 480 °C. The typical microstructure at this temperature was SiC<sub>p</sub>/Al + Bi<sub>2</sub>O<sub>3</sub>-B<sub>2</sub>O<sub>3</sub>-ZnO glass + Bi<sub>24</sub>B<sub>2</sub>O<sub>39</sub> + Si<sub>2</sub>Al<sub>2</sub>O<sub>7</sub> + SiO<sub>2</sub>, and the interface was bonded by the intermolecular force between the Bi<sub>2</sub>O<sub>3</sub>-B<sub>2</sub>O<sub>3</sub>-ZnO (BBZ) glass and SiC<sub>p</sub>/Al composite. Besides, the precipitation of the Bi<sub>24</sub>B<sub>2</sub>O<sub>39</sub> phase improved the mechanical properties of the joint with a maximum strength of 17.3 MPa, and the fractures all occurred in the Bi<sub>2</sub>O<sub>3</sub>-B<sub>2</sub>O<sub>3</sub>-ZnO (BBZ) glass of the brazing seam. The proof-of-concept study on the brazing of SiC<sub>p</sub>/Al composite with BBZSA glass provides insights in the further development of ceramic/metal composite joining.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114932"},"PeriodicalIF":4.8,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628331","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

Hybrid carbon‑silicon carbide fibers produced from stabilized pitch filaments and carbon fibers

IF 4.8 2区材料科学

Materials Characterization Pub Date : 2025-03-13 DOI: 10.1016/j.matchar.2025.114931

Priscila Sieira , Caroline J.B. Guimarães , Eduardo de Sousa Lima , Maria Helena Pereira , Luiz E.P. Borges

{"title":"Hybrid carbon‑silicon carbide fibers produced from stabilized pitch filaments and carbon fibers","authors":"Priscila Sieira , Caroline J.B. Guimarães , Eduardo de Sousa Lima , Maria Helena Pereira , Luiz E.P. Borges","doi":"10.1016/j.matchar.2025.114931","DOIUrl":"10.1016/j.matchar.2025.114931","url":null,"abstract":"<div><div>Carbon fibers and their intermediates, oxidative-stabilized filaments, were used as carbon sources in the chemical vapor reaction method to produce carbon‑silicon carbide fibers. A comprehensive analysis of the microstructure and composition of the fibers was achieved using a combination of microscopic detectors, including Secondary Electron (SE), Backscattered Electron (BSE), and Energy Dispersive X-ray Spectroscopy (EDS). This analysis revealed a dense carbide layer and SiC deposits within the fibers, positioned near their core, in samples derived from both precursors. The reaction conditions and precursors allowed the diffusion of SiO gas through the fiber structure. This method, when applied to stabilized filaments, demonstrated the feasibility of simultaneously forming carbide during fiber carbonization. SiC nanowires were observed exclusively in products derived from carbon fibers. Through X-ray diffraction (XRD) and Raman spectroscopy, crystallinity and defects of the raw materials and hybrids were assessed. The small differences did not justify the absence of the nanostructures in hybrids produced from stabilized filaments. Instead, the lack of SiC whiskers were associated with the emission of volatile compounds at the high temperature treatment.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"223 ","pages":"Article 114931"},"PeriodicalIF":4.8,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654619","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

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