Acta Materialia最新文献

{"title":"Insights into irradiation-induced defect evolution and segregation in metastable high-entropy alloys: Effects of high-density incoherent planar defects and temperature","authors":"Weisong Wu,&nbsp;Qiankun Yang,&nbsp;Wei Zhang,&nbsp;Yong Zhang,&nbsp;Dingshun Yan,&nbsp;Zhiming Li","doi":"10.1016/j.actamat.2025.120994","DOIUrl":"10.1016/j.actamat.2025.120994","url":null,"abstract":"<div><div>Strong and ductile metastable high-entropy alloys (HEAs) have potential to achieve excellent irradiation resistance with the presence of multiple principal elements. In this work, irradiation behavior of a prototype metastable HEA composed of face-centered cubic matrix and dispersed <em>σ</em> precipitates was systematically studied with the focus on revealing the effects of temperature and high-density planar defects (e.g., grain boundaries and incoherent phase boundaries) on the defect evolution and segregation behavior. Transmission electron microscopy analysis shows that dislocation-denuded zones (DDZs) are formed in the vicinities of grain boundaries and <em>σ</em> phase boundaries after irradiation at room temperature (RT), whereas dislocation-enriched zones (DEZs, mainly faulted loops) are developed near these interfaces upon irradiation at 500 °C. This is mainly attributed to the temperature-dependent defect mobility. Upon irradiation at 500 °C, Co and Ni tend to be enriched, but Fe, Cr and Mn prefer to be depleted around dislocation loops and interfaces, which follows the inverse Kirkendall mechanism and has been verified by first-principles calculations. Moreover, grain refinement and precipitation lead to increased volume fraction of DDZs at RT, whereas the absorption of defects at 500 °C can be promoted due to enhanced defect mobility, enabling a more prominent irradiation hardening resistance at various temperatures. The work rationalizes the enhanced irradiation resistance in fine-grained metastable HEAs with dispersive precipitates and provides important insights for developing irradiation-resistant alloys with excellent mechanical properties.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"291 ","pages":"Article 120994"},"PeriodicalIF":8.3,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143723410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rate-dependent ductile-brittle transition in a Medium Mn steel","authors":"Y.X. Liu ,&nbsp;C. Hu ,&nbsp;C.P. Huang ,&nbsp;S. Pan ,&nbsp;B.B. He ,&nbsp;M.X. Huang","doi":"10.1016/j.actamat.2025.120996","DOIUrl":"10.1016/j.actamat.2025.120996","url":null,"abstract":"<div><div>Medium Mn steels (MMS) have received significant attention owing to their excellent tensile properties and rich deformation mechanisms. This work reports a strain rate-dependent ductile-brittle transition phenomenon in strain rate regime of 10^–6 s^-1 to 10¹ s^-1, where uniform elongation dramatically increases from ∼10 % at 10^–6 s^-1 to ∼50 % at 10⁰ s^-1. In other words, this MMS exhibits brittleness at a low strain rate but becomes ductile at a high strain rate. To unveil the origin of this unusual phenomenon, comprehensive characterizations focusing on microstructural evolution, fracture behavior, and strain heterogeneity at various strain rates have been carried out. Despite similar microstructural evolutions, the fracture morphology transits from brittle fracture featuring quasi-cleavage and intergranular cracks at low strain rate to ductile fracture featuring dimples at high strain rate. Strong but brittle fresh martensite and soft austenite matrix lead to higher strain heterogeneity at low strain rate, while strain incompatibility is largely alleviated due to plastic deformation of fresh martensite at high strain rate. Further tensile tests on the same MMS with pre-introduced fresh martensite and tempered martensite highlight the critical role of interstitial carbon solutes in governing the rate-dependent ductile-brittle transition. As identified by atom probe tomography, the difference in carbon clusters in fresh martensite at different strain rates indicates the activation of carbon drag effect on dislocations. The carbon drag effect is inversely proportional to strain rate, which is believed to affect the deformability of fresh martensite, leading to the strain rate-dependent ductile-brittle transition phenomenon.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"290 ","pages":"Article 120996"},"PeriodicalIF":8.3,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An energetic link between order and strength in metals: A nanocrystalline strength limit in high-entropy alloys and intermetallic compounds","authors":"Nicolas Argibay ,&nbsp;Duane D. Johnson ,&nbsp;Michael Chandross ,&nbsp;Ryan T. Ott ,&nbsp;Hailong Huang ,&nbsp;Rameshwari Naorem ,&nbsp;Gaoyuan Ouyang ,&nbsp;Andrey V. Smirnov ,&nbsp;Prashant Singh","doi":"10.1016/j.actamat.2025.120990","DOIUrl":"10.1016/j.actamat.2025.120990","url":null,"abstract":"<div><div>The metallurgy and materials communities have long understood and exploited fundamental links between chemical and structural ordering in metallic solids to tailor their mechanical properties. We extend these ideas to include prediction of the nanocrystalline strength limit in high-entropy alloys and intermetallic compounds, where a breakdown occurs in the classical Hall-Petch strengthening behavior. The highest reported strength achievable through alloying has rapidly climbed and given rise to new classifications of materials with extraordinary properties, with a notable case being nanocrystalline metals. High-entropy alloys (chemically disordered, concentrated solid solutions) and intermetallic compounds are two boundary cases of how tailored order can be used to manipulate mechanical behavior. Here, we show that the complex electronic-structure mechanisms governing the peak strength of alloys and pure metals can be reduced to a few physically meaningful parameters based on their atomic arrangements and used – <em>with no fitting parameters</em> – to predict the maximum strength of these materials. This includes a generalized energy-based accounting for the degree of structural and chemical ordering that allows for rapid and reasonably accurate prediction of peak strength (validated in the nanocrystalline limit) as a function of temperature. Predictions of maximum strength based on the activation energy (with all materials properties derived from DFT calculations or experiments) for a stress-driven transition to an amorphous state is shown to accurately describe the breakdown in Hall-Petch behavior at the smallest crystallite sizes for pure metals, intermetallic compounds, high-entropy alloys, and metallic glasses. This activation energy is also shown to be directly proportional to interstitial electronic charge density, which is a good predictor of ductility, stiffness (moduli), and phase stability in high-entropy alloys and solid metals generally. The proposed framework suggests the possibility of coupling ordering and intrinsic strength to mechanisms like dislocation nucleation, hydrogen embrittlement, and transport properties, such as through correlations between the activation energies for amorphization with stacking-fault and grain boundary energies. It additionally opens the prospect for greatly accelerated structural materials design and development to address materials challenges limiting more sustainable and efficient use of energy.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"290 ","pages":"Article 120990"},"PeriodicalIF":8.3,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Size-Dependent Stress Response of Nanoscale B2 Intermetallic Precipitates Revealed by In-situ High-Energy X-ray Diffraction","authors":"Javad Mola, Steffen Scherbring, Ulrich Lienert, Alireza Zargaran, Horst Biermann, Puspendu Sahu","doi":"10.1016/j.actamat.2025.120967","DOIUrl":"https://doi.org/10.1016/j.actamat.2025.120967","url":null,"abstract":"<em>In-situ</em> high-energy X-ray diffraction experiments under uniaxial loading revealed the stress distribution among austenite, ferrite, and nanoscale B2-(Ni,Fe)Al intermetallic precipitates embedded in the ferrite phase of an Al-added lightweight steel. Stress analysis based on the lattice strains induced by uniaxial tensile loading, while assuming a uniaxial stress state within the grains and neglecting residual stresses, indicated earlier yielding of austenite and the development of higher stresses in ferrite. Remarkably, at an applied true stress of nearly 1.0 GPa, stresses up to about 5.8 GPa were determined within the B2 precipitates. The stress level within the B2 precipitates, which exhibited a bimodal size distribution, was strongly size-dependent, with the finer population experiencing higher stresses. Due to the low Schmid factor for <span><math><mrow is=\"true\"><mo is=\"true\">{</mo><mrow is=\"true\"><mi is=\"true\">h</mi><mi is=\"true\">k</mi><mi is=\"true\">l</mi></mrow><mo is=\"true\">}</mo><mo is=\"true\">〈</mo><mn is=\"true\">100</mn><mo is=\"true\">〉</mo></mrow></math></span> slip as the preferred slip system in B2, plastic deformation of B2 in this hard orientation was enabled by <span><math><mrow is=\"true\"><mo is=\"true\">〈</mo><mn is=\"true\">111</mn><mo is=\"true\">〉</mo></mrow></math></span> slip, aided by the penetration of <span><math><mrow is=\"true\"><mfrac is=\"true\"><mn is=\"true\">1</mn><mn is=\"true\">2</mn></mfrac><mrow is=\"true\"><mo is=\"true\">〈</mo><mn is=\"true\">111</mn><mo is=\"true\">〉</mo></mrow></mrow></math></span> dislocations gliding on <span><math><mrow is=\"true\"><mo is=\"true\">{</mo><mn is=\"true\">110</mn><mo is=\"true\">}</mo></mrow></math></span> planes in the cube-on-cube-related ferrite. The high stresses in B2 upon loading along the <span><math><mrow is=\"true\"><mo is=\"true\">〈</mo><mn is=\"true\">100</mn><mo is=\"true\">〉</mo></mrow></math></span> direction raised the stress level in the surrounding ferrite, which is a likely cause of <span><math><mrow is=\"true\"><mo is=\"true\">{</mo><mn is=\"true\">100</mn><mo is=\"true\">}</mo></mrow></math></span> cleavage in embrittled body-centered cubic steels. This study enhances our understanding of the micromechanical behavior of precipitation-strengthened alloys and elucidates how matrix-precipitate interactions influence macroscopic mechanical properties.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"183 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unexpected cellular growth of nanoporous gold during dealloying: Indication of vacancy injection?","authors":"Sheng-Nan Yang ,&nbsp;Hui Xie ,&nbsp;Fan Liu ,&nbsp;Hai-Jun Jin","doi":"10.1016/j.actamat.2025.120959","DOIUrl":"10.1016/j.actamat.2025.120959","url":null,"abstract":"<div><div>Dealloying can lead to stress corrosion cracking in engineering alloys or produce nanoporous materials for various functional applications. The role of bulk diffusion in dealloying has been debated since the 1960s when Pickering and Wagner proposed a vacancy-mediated lattice diffusion mechanism to explain the dealloying process. However, this mechanism was proven invalid because lattice diffusion is too slow to account for the rapid dealloying process at room temperature. Instead, it is now widely accepted that dealloying is dominated by the interfacial dissolution of more-reactive components, not necessarily involving lattice diffusion in the bulk. In this study, we report that the dealloying of Cu(Au) alloys at low potentials is incomplete, leaving some un-etched thin walls within the matrix of nanoporous gold. This results from the cellular growth of the nanoporous gold phase during dealloying, with cell walls composed of the precursor alloy phase slightly enriched with Au. This behavior is analogous to the cellular growth of solid phase during directional alloy solidification, suggesting that lattice diffusion may have occurred in the solid ahead of the dealloying front. Vacancy injection may lead to Au enrichment due to the inverse Kirkendall effect, enhancing the critical dealloying potential of the precursor ahead of the dealloying front, and triggering the unstable growth of the nanoporous gold phase. Although direct evidence is still lacking, our finding suggests that vacancy injection is involved in dealloying, which may have important implications on the design of corrosion-resistant alloys or novel nanoporous materials.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"290 ","pages":"Article 120959"},"PeriodicalIF":8.3,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143723407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structure, phase transitions and hard magnetic properties of ternary Fe1.93(P1-xSix) compounds with x ≤ 0.5","authors":"Surilemu Surilemu, L.L. Bao, H. Yibole, S. Erdmann, H.İ. Sözen, T. Klüner, F. Guillou","doi":"10.1016/j.actamat.2025.120991","DOIUrl":"https://doi.org/10.1016/j.actamat.2025.120991","url":null,"abstract":"Fe₂(P,Si) ternary derivatives from the Fe₂P parent hexagonal compound have so far received less attention than their quaternary counterparts, such as the (Mn,Fe)₂(P,Si) giant magnetocaloric materials; Yet, Fe₂(P,Si) compounds present an intriguing phase diagram with the development of a body-centered orthorhombic (BCO) structure when Si substitutes P. Here, we revisit their crystal structure and magnetic properties with the objective of establishing the properties of orthorhombic Fe_1.93P_1-<em>_x</em>Si<em>_x</em> compounds. The BCO to Fe₂P-type transition observed in Si substituted samples is found to be of first-order type and associated with a significant latent heat, a large volume discontinuity and an electrical transport anomaly. Furthermore, the potential for inducing this transition through the application of external fields was investigated. It revealed that the relatively modest difference in magnetization between the hexagonal and BCO structures renders the transition more sensitive to physical pressure. The recent surge of interest in the application of Fe₂P-type materials as permanent magnets also prompted us to investigate their magneto-crystalline anisotropy. A uniaxial anisotropy is found even in the BCO phase, with a large anisotropy constant of approximately 0.86 MJm⁻³ at room temperature. In combination with Curie temperatures which are much higher than room temperature, this makes BCO compounds potential rare-earth free permanent magnets, as demonstrated by the observation of a finite coercivity in BCO Fe_1.93P_0.6Si_0.4 ball milled powders (<em>H</em>_C ≈ 1.5 kOe). This work reveals that the exploration of Fe₂P materials for permanent magnet applications should not be limited to the hexagonal structure.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"12 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143723411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Amorphous/nanocrystalline composite structure strategy for MoAlB: Achieving rapid formation and gradual growth of α-Al2O3 scale at 1200 °C","authors":"Yagang Zhang,&nbsp;Guojun Zhang,&nbsp;Zhangwen Xie,&nbsp;Tao Wang,&nbsp;Caixia Wang,&nbsp;Quan Zhao,&nbsp;Boyan Wang","doi":"10.1016/j.actamat.2025.120986","DOIUrl":"10.1016/j.actamat.2025.120986","url":null,"abstract":"<div><div>MoAlB, with a blend of metallic and ceramic attributes, receives special attention for high-temperature protective applications. Nevertheless, the formation of volatile oxides resulting from Al depletion accelerates the degradation of MoAlB. In this study, we adopted a configurational design strategy specifically targeting the in-situ precipitation of MoAlB nanocrystals within amorphous composites to achieve an amorphous/nanocrystalline composite structure of MoAlB (ACCS-MoAlB), for enhancing its oxidation resistance and elucidating the atomic-level oxidation mechanism of MoAlB. The obtained ACCS-MoAlB sample exhibited remarkable resistance to oxidation in ambient air at 1200 °C. This is because the rapid formation of a protective α-Al₂O₃ scale generated by the synergistic interaction between metastable amorphous composites (resistant to oxygen permeation) and MoAlB nanocrystals (exhibiting selective oxidation behavior), as well as the slow growth characteristics of the scale due to the nucleation and growth of both these structural units exposed to thermal conditions during the oxidation process. Among them, the selective oxidation behavior of MoAlB was observed as a result of vacancy-mediated preferential outward migration of Al along the [100] direction. Furthermore, the good adhesion between the oxide scale and the Al-depleted MoAlB matrix was found to originate from the dislocation-free coherent epitaxial growth of α-Al₂O₃.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"290 ","pages":"Article 120986"},"PeriodicalIF":8.3,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143703377","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced thermoelectric performance in pristine AgSbTe2 compound via rational design of Ag2Te formation","authors":"Zeqing Hu ,&nbsp;Minhui Yuan ,&nbsp;Wenjie Li ,&nbsp;Sining Wang ,&nbsp;Jingfeng Li ,&nbsp;Jiahao Jiang ,&nbsp;Jing Shuai ,&nbsp;Yanglong Hou","doi":"10.1016/j.actamat.2025.120985","DOIUrl":"10.1016/j.actamat.2025.120985","url":null,"abstract":"<div><div>AgSbTe₂ has garnered considerable attention in the thermoelectric community due to its excellent thermoelectric properties in the medium to low-temperature region. However, its electrical transport performance is significantly affected due to both the Ag₂Te secondary phase and intrinsic defects. Here, a two-step prepared strategy is employed to promote synergistic optimization between the concentration of Ag vacancies and the mass percentages of Ag₂Te nanoprecipitate, resulting in a significant improvement in carrier mobility from ∼192.89 to ∼375.71 cm² V⁻¹ s⁻¹ at 300 K. Additionally, the nanoprecipitates and dislocation introduced through the rational design of Ag₂Te formation leads to a remarkable reduction in thermal conductivity. A maximum figure of merit of ∼1.18 at 548 K and an average figure of merit of ∼0.94 at 300–633 K were obtained for QA-AgSbTe₂ (quenching temperature (Q) = 773 K, Annealing time (A) = 24 h), surpassing those of pristine AgSbTe₂ compound with pervasive Ag₂Te. This work reveals that the carrier and phonon transport performance of AgSbTe₂ can be effectively decoupled by the optimization of Ag vacancy concentration and introduction of dislocation via adjusting mass percentages of Ag₂Te nanoprecipitate.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"290 ","pages":"Article 120985"},"PeriodicalIF":8.3,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143703374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A layer model for the kinetics of segregation in planar defects in multi-component materials","authors":"Dongsheng Wen ,&nbsp;Victoria Tucker ,&nbsp;Michael S. Titus","doi":"10.1016/j.actamat.2025.120948","DOIUrl":"10.1016/j.actamat.2025.120948","url":null,"abstract":"<div><div>Suzuki segregation and local phase transformations are widely observed across materials with extended planar defects, offering opportunities to design novel high-temperature and functional materials enabled by the nanoscale two-dimensional defects. However, the kinetics of the segregation process are not well understood despite intensive efforts have been made to investigate the segregation profiles at equilibrium and non-equilibrium conditions. In this work, a new model is proposed to study the temperature- and time-dependent segregation process to facilitate the research of this phenomenon. The model is established from the segregation energy landscape across the planar defects and the interlayer diffusion process. The model is applied to the Co-Ni binary alloys, Co-based superalloys, and Ni-based superalloys to understand the characteristics of segregation at equilibrium, the timescale required to reach equilibrium, and the influence of solute–solute interactions in the process. The kinetic model can be implemented with the thermodynamic models of segregation energy, which is demonstrated for a Ni-Co-Cr system. Based on the findings, a time–temperature–segregation diagram is proposed to determine the heat treatment parameters or thermal exposure profiles to achieve Suzuki segregation and local phase transformation for material design.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"290 ","pages":"Article 120948"},"PeriodicalIF":8.3,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143703375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Generative 3D reconstruction of Ti-6Al-4V basketweave microstructures by optimization of differentiable microstructural descriptors","authors":"Vincent Blümer ,&nbsp;Ali Reza Safi ,&nbsp;Celal Soyarslan ,&nbsp;Benjamin Klusemann ,&nbsp;Ton van den Boogaard","doi":"10.1016/j.actamat.2025.120947","DOIUrl":"10.1016/j.actamat.2025.120947","url":null,"abstract":"<div><div>We present a methodology for the generative reconstruction of 3D microstructures from 2D cross-sectional electron backscatter diffraction micrographs. The method is applied to Ti-6Al-4V processed by laser powder bed fusion, where a high amount of basketweave morphology is observed, which arises from the solid-state <span><math><mrow><mi>β</mi><mo>→</mo><mi>α</mi></mrow></math></span>-transition upon cooling. Prior-<span><math><mi>β</mi></math></span>-grain reconstruction is performed and the out-of-plane orientation of the observed grains is obtained leveraging Burgers orientation relationship. Microstructural descriptors related to convolutional neural networks are extracted from the 2D micrographs, and used for cross-section-based optimization of pixel values in a 3D volume. In order to reconstruct crystallographic orientations, the orientation distribution of the basketweave microstructure is reduced to a discrete set of characteristic orientations, which are sequentially reconstructed as separate components. Our reconstructions capture the characteristic lath morphology that is typically observed in powder bed fusion-processed Ti-6Al-4V and perform well in comparisons of chord length, as well as grain size, aspect ratio, and axis orientation distributions.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"291 ","pages":"Article 120947"},"PeriodicalIF":8.3,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143695261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}