Acta Materialia最新文献

Measuring interdiffusion coefficient from XRD spectra of thermally annealed superlattices: A combined modeling and experimental study in Fe-Cr nanometric multilayers

IF 9.4 1区材料科学

Acta Materialia Pub Date : 2025-01-30 DOI: 10.1016/j.actamat.2025.120765

Thomas Schuler, Pamela Camilos, Gladice Magnifouet, Frédéric Soisson, Estelle Meslin, Maxime Vallet, Véronique Pierron-Bohnes, Maylise Nastar

{"title":"Measuring interdiffusion coefficient from XRD spectra of thermally annealed superlattices: A combined modeling and experimental study in Fe-Cr nanometric multilayers","authors":"Thomas Schuler, Pamela Camilos, Gladice Magnifouet, Frédéric Soisson, Estelle Meslin, Maxime Vallet, Véronique Pierron-Bohnes, Maylise Nastar","doi":"10.1016/j.actamat.2025.120765","DOIUrl":"https://doi.org/10.1016/j.actamat.2025.120765","url":null,"abstract":"In this paper, we employ atomic kinetic Monte Carlo (AKMC) simulations to get insight into the kinetics of Fe-Cr interdiffusion in nanometric multilayer materials, and the relevant information that can be extracted from the evolution of the experimental X-ray diffraction (XRD) spectrum. For this purpose, we develop an elastic model to obtain the interplanar spacing for a given composition profile derived from AKMC simulation, and then we simulate the corresponding XRD spectrum and compare it with the experimental one. We find a very good agreement between the two, which validates our modeling procedure. Then we put some effort into trying to relate specific features of the XRD spectra with phenomena occurring at the atomic scale, mostly the decay of satellite peak intensities over time. The interdiffusion coefficients extracted from the XRD spectra are underestimated in the Fe-rich phase and overestimated in the Cr-rich phase, but more or less within one order of magnitude of the values obtained from standard measurements. Extracting more quantitative kinetic information directly from the experimental XRD spectra is rather difficult without resorting to a modeling study.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"53 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056702","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}

引用次数: 0

Deformation Mechanisms of Nanoporous Oxide Glasses: Indentations and Finite Element Simulation

IF 9.4 1区材料科学

Acta Materialia Pub Date : 2025-01-30 DOI: 10.1016/j.actamat.2025.120779

Dong Wu, Zixiao Xue, Zhicheng Ni, Yinfeng Li, Zhuocheng Chen, Xiaomeng Zhu, Yinsheng Xu, Ping Lu, Long Zhang, Jin He

{"title":"Deformation Mechanisms of Nanoporous Oxide Glasses: Indentations and Finite Element Simulation","authors":"Dong Wu, Zixiao Xue, Zhicheng Ni, Yinfeng Li, Zhuocheng Chen, Xiaomeng Zhu, Yinsheng Xu, Ping Lu, Long Zhang, Jin He","doi":"10.1016/j.actamat.2025.120779","DOIUrl":"https://doi.org/10.1016/j.actamat.2025.120779","url":null,"abstract":"Nanoporous oxide glasses have a wide array of applications including medicine, sensor and optics, owing to their high thermal and chemical stability. However, the correlations between their topological structure, glass system and mechanical properties are still poorly understood. In this paper, we bridged this structure-composition-property gap by utilizing nanoindentation and finite element simulation on two series of sol-gel derived nanoporous glasses: phosphate (AP) and silicate (SA) glasses. The critical length of cracks 2ac was found much smaller in the AP glasses (7.3 nm) than in the SA glasses (20.3 nm). As a result, the AP glasses with larger pores (6∼10 nm) were more easily crushed than the SA glasses with finer pores (1∼6 nm). Similar small physical activation volumes Ω (2∼3 nm3) have been measured in fully dense SiO2 glass and the porous glasses with lower porosity (< 30%) or smaller pore size (< 2nm), indicating the catastrophic cracks initiate at the inhomogeneities of glass network, regardless of its porous structure or not. The linear dependence of Ω on pore size or porosity probably arise from the less constrained porous structure, and the shearing crack prefer to nucleate on the pore wall under compression. The deformation mechanisms of nanoporous glasses have been summarized and rationalize the evolution of brittle fracture behaviors in the SA and AP glasses. The hardness H and elastic modulus E of porous glasses were found still obey the classical Gibson & Ashby's model, which is valuable to develop novel porous glasses for future industrial applications.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"14 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056694","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}

引用次数: 0

In3Li13(311)/Li(110) Coherent Heterogeneous Induced Uniform Epitaxial Electrodeposition Enabling the Stable Ultrathin Lithium Metal Anode

IF 9.4 1区材料科学

Acta Materialia Pub Date : 2025-01-30 DOI: 10.1016/j.actamat.2025.120780

An Wang, Shaozhen Huang, Zhangdi Xie, Jiahua Liao, Wenhao Li, Yuejiao Chen, Huimiao Li, Zhe Wang, Zhibin Wu, Libao Chen

{"title":"In3Li13(311)/Li(110) Coherent Heterogeneous Induced Uniform Epitaxial Electrodeposition Enabling the Stable Ultrathin Lithium Metal Anode","authors":"An Wang, Shaozhen Huang, Zhangdi Xie, Jiahua Liao, Wenhao Li, Yuejiao Chen, Huimiao Li, Zhe Wang, Zhibin Wu, Libao Chen","doi":"10.1016/j.actamat.2025.120780","DOIUrl":"https://doi.org/10.1016/j.actamat.2025.120780","url":null,"abstract":"A growing need for high-energy-density lithium metal batteries appeal for utilize ultrathin (≤50 μm) free-standing Li metal anodes. However, challenges such as the formation of an unstable solid electrolyte interphase and the lithium dendrites growth have led to poor cycling performance and safety concerns, limiting the commercial viability of thin lithium metal anodes. This work introduces a facile approach by designing and fabricating an ultrathin Li-In alloy anode through in-situ vacuum melting and codirectional continuous rolling. The rolled ultrathin Li-In anode achieves the induction of uniform epitaxial electrodeposition of Li(110), which is attributed to the lithiophility of the densely distributed In₃Li₁₃ alloy phase and the coherent heterogeneous relationship between textured In₃Li₁₃(311) and Li(110).The symmetrical cell assembled by 50 μm Li-In alloy anode exhibits a prolonged lifespan for 1800 h under the conditions of 1 mA cm-2 and 3 mAh cm-2. Meanwhile, the LiFePO4||Li-In (50 μm) full cell achieves stable 450 cycles with a retention of 90.3% at 2 C (1 C = 170 mA g-1). This work paves the path for the practical ultrathin Li anode for commercializing the lithium metal batteries.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"10 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056695","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}

引用次数: 0

Distribution of microscale stress and effect on mechanical performance of cermets with metallic nanoparticles in ceramic grains 陶瓷颗粒中含有金属纳米颗粒的金属陶瓷的微观应力分布及其对机械性能的影响

IF 9.4 1区材料科学

Acta Materialia Pub Date : 2025-01-29 DOI: 10.1016/j.actamat.2025.120785

Bin Zhou, Hao Lu, Haibin Wang, Xuemei Liu, Xiaoyan Song

{"title":"Distribution of microscale stress and effect on mechanical performance of cermets with metallic nanoparticles in ceramic grains","authors":"Bin Zhou, Hao Lu, Haibin Wang, Xuemei Liu, Xiaoyan Song","doi":"10.1016/j.actamat.2025.120785","DOIUrl":"https://doi.org/10.1016/j.actamat.2025.120785","url":null,"abstract":"This study realized modulation of size and content of metallic nanoparticles inside ceramic grains of cermets using WC-Co cemented carbides as an example. The approach was based on tailoring the composition of the in-situ reactants of synthesizing ceramic-metal composite powders. With the optimized size and content of nanoparticles distributing in WC grains, simultaneous improvement in hardness, strength, and fracture toughness was achieved in the prepared WC-Co cemented carbides, and the integrated mechanical properties reached the highest among the cermets with similar compositions reported in the literature. The effect of metallic nanophases in ceramic grains on the microscale stress and strain distributions of the cermets was quantitatively investigated. Detailed characterization and analysis of the interactions between the metallic nanophases and ceramic dislocations revealed that these nanophases hindered dislocation motion but did not cause local stress concentration and microcrack nucleation, hence enabled to concurrently strengthen and toughen the ceramic grains. This study provides a unique method and quantitative guideline for developing cermets with superior integrated mechanical properties, particularly important for cermet materials with low metal contents.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"29 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143055585","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}

引用次数: 0

Atomistically-informed cluster dynamics modeling of concurrent interstitial and vacancy a-loop evolution in irradiated alpha-zirconium

IF 9.4 1区材料科学

Acta Materialia Pub Date : 2025-01-28 DOI: 10.1016/j.actamat.2025.120777

Jose F. March-Rico, Sophie Blondel, Brian D. Wirth

{"title":"Atomistically-informed cluster dynamics modeling of concurrent interstitial and vacancy a-loop evolution in irradiated alpha-zirconium","authors":"Jose F. March-Rico, Sophie Blondel, Brian D. Wirth","doi":"10.1016/j.actamat.2025.120777","DOIUrl":"https://doi.org/10.1016/j.actamat.2025.120777","url":null,"abstract":"A cluster dynamics framework is described that incorporates an extensive database of atomistic simulation results to minimize assumptions in microstructure evolution modeling in irradiated alpha-zirconium. This database informs mechanisms of: 1) defect production behavior in displacement cascades, 2) thermal dissociation rates for all defect clusters, 3) point defect and defect cluster mobility (including anisotropy), 4) spontaneous and thermal drift defect capture at dislocation loops, and 5) cascade overlap effects on defect generation rates. The proposed model mechanistically predicts the concurrent nucleation and growth of interstitial and vacancy a-loops; vacancy loop nucleation is assisted by in-cascade vacancy clustering while vacancy loop growth is stabilized by the incorporation of thermal drift capture radii. Cascade overlap effects on defect generation rates are found to be a necessary component for model predictions of a-loop densities and sizes consistent with the experimental literature. Key characteristics such as average loop diameters, number densities, and the relative ratio of loops with interstitial and vacancy character are in good agreement with experimental observations for neutron-irradiated pure, single-crystalline α-zirconium. As such, the scale-bridging approach between atomistic simulations and cluster dynamics modeling provides several improvements over the assumptions that are commonly implemented in cluster dynamics models and set the stage for future experimental validation.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"23 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143050653","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}

引用次数: 0

Disorientation-based classification of mesostructures in severely deformed copper alloys 基于取向的严重变形铜合金介观结构分类

IF 9.4 1区材料科学

Acta Materialia Pub Date : 2025-01-28 DOI: 10.1016/j.actamat.2025.120714

Oleg Bushuev, Elijah Borodin, Anna Bodyakova, Siying Zhu, Andrey P. Jivkov

{"title":"Disorientation-based classification of mesostructures in severely deformed copper alloys","authors":"Oleg Bushuev, Elijah Borodin, Anna Bodyakova, Siying Zhu, Andrey P. Jivkov","doi":"10.1016/j.actamat.2025.120714","DOIUrl":"https://doi.org/10.1016/j.actamat.2025.120714","url":null,"abstract":"Long-range interactions and correlations are distinctive attributes of non-equilibrium processes. A suitable tool for studying long-range interactions in polycrystalline materials is the orientation correlation function. It was introduced as early as 1965 using the concept of mesotexture which incorporates information about grain orientations and geometries. However, its application has been limited because most materials’ characterisation works are still focused on conventional texture analysis. More recent studies proved that grain-grain interactions were independent of grain size, but did not go further to consider the longer-range interactions on structure development. The present study uses a novel discrete methodology for reconstruction and analysis of polycrystalline structures obtained by EBSD microscopy that allows for the first time to reveal and quantify the long-range effects on structure evolution of severely deformed Cu-0.1%Cr-0.1%Zr, Cu-0.1%Cr-0.1%Zr-0.05%Y, Cu-0.3%Cr-0.5%Zr and Cu-0.25%Mg (wt%) alloys. It is shown that the first- and second-order grain neighbours in all considered alloys obey scale-invariant power-law dependence as revealed in the previous studies with the first-order grain neighbours. However, our results show that the scale invariance extends much farther, between the fourth and seventh grain neighbours, depending on the material and accumulated plastic strain. These results cannot be explained by the conventional size effect reasoning discussed in previous publications. They suggest that the material discreteness, in the sense of numbers rather than sizes of grains, is the origin of the observed long-range correlations and the emergence of mesostructure that breaks the scale invariance.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"40 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143055587","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}

引用次数: 0

Copper vacancies-driven tensile lattice strain accelerates oxygen reduction in photo-assisted Zn-air batteries cathodes

IF 9.4 1区材料科学

Acta Materialia Pub Date : 2025-01-28 DOI: 10.1016/j.actamat.2025.120781

Jiajia Li, Chenxi Dang, Qiancheng Zhu, Ling Li, Wenming Zhang

{"title":"Copper vacancies-driven tensile lattice strain accelerates oxygen reduction in photo-assisted Zn-air batteries cathodes","authors":"Jiajia Li, Chenxi Dang, Qiancheng Zhu, Ling Li, Wenming Zhang","doi":"10.1016/j.actamat.2025.120781","DOIUrl":"https://doi.org/10.1016/j.actamat.2025.120781","url":null,"abstract":"Recently, photo-assisted Zn-air batteries (ZABs) have been confirmed to accelerate the kinetics of oxygen reduction reaction (ORR); however, challenges such as rapid charge carrier recombination and low light utilization efficiency still remain. Herein, lattice-distorted copper oxide was constructed by copper vacancies (CuO-0.9%VCu). Approximate 0.9% deficiency of Cu2+ (t2g6eg3) creats 2.16% tensile strain through the Jahn-Teller effect. This tensile strain allows strong chemisorption and activation of *OOH intermediates on active Cu atoms due to the upshift of d-band center, thus prompting fast O2 reduction rate. Additionally, copper vacancies can act as hole traps to inhibit rapid electron-hole recombination, enabling the CuO-0.9%VCu photocathode to achieve a charge separation yield of 59% and a transfer yield of 70% in ORR reactions. Therefore, ZABs using CuO-0.9%VCu as photocathodes deliver a remarkable discharge voltage of 1.36 V, a high energy efficiency of 70.47%, and a cyclic durability of surpassing 100 h under 1-sun illumination. CuO-0.9%VCu provides a typical case for the usage of clean and readily available light energy, as well as offers a typical case to realize simultaneously harvesting, converting and storing of solar energy.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"59 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143055586","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}

引用次数: 0

Quantifying Damage Mechanisms Through FE-based Void Tracking: Application to Shear and Tension In-situ Laminography Experiments on AA2198-T851

IF 9.4 1区材料科学

Acta Materialia Pub Date : 2025-01-28 DOI: 10.1016/j.actamat.2025.120783

Christian C. Roth, Thilo F. Morgeneyer, Lukas Helfen, Dirk Mohr, Thomas Tancogne-Dejean

{"title":"Quantifying Damage Mechanisms Through FE-based Void Tracking: Application to Shear and Tension In-situ Laminography Experiments on AA2198-T851","authors":"Christian C. Roth, Thilo F. Morgeneyer, Lukas Helfen, Dirk Mohr, Thomas Tancogne-Dejean","doi":"10.1016/j.actamat.2025.120783","DOIUrl":"https://doi.org/10.1016/j.actamat.2025.120783","url":null,"abstract":"This study presents a hybrid experimental-numerical postprocessing technique for analyzing damage evolution during in-situ tomography experiments. Using the displacement fields obtained from finite-element (FE) simulations as initial guesses, voids are tracked throughout loading by mapping their centroids to the initial configuration with a novel void tracking algorithm. This algorithm facilitates differentiation between void nucleation, growth and/or coalescence of existing voids. In-situ laminography experiments are performed on flat shear, central-hole tension, notched tension and compact tension specimens extracted from recrystallized aluminum alloy 2198-T851. The specimens are monotonically loaded all the way to fracture to gain insight into ductile failure mechanisms for predominantly biaxial stress states. Detailed 3D gray scale images are acquired at multiple stages of each experiment, allowing distinguishing between polycrystalline matrix, inter-metallic particles and voids at sub-micrometer resolution. The postprocessing of all experiments leads to a wealth of experimental data on void sizes, shapes, counts, volume fractions, and mechanisms of origin. Average stress states and macroscopic strain estimates are derived using continuum scale FE simulations with an anisotropic non-porous plasticity model and related to the void evolution. The tomographic observations show two primary damage mechanisms at early plastic straining stages: (1) intermetallic particle cracking and debonding, and (2) micro-crack emergence mainly at grain boundaries. At high plastic straining stages, grain boundary unzipping leads to fracture via micro-crack growth and coalescence, more prevalent under generalized shear than tension. It is found that particle-related void growth is slow and enhances the material's macroscopic ductility by delaying the growth of large voids.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"16 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143055584","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}

引用次数: 0

Blistering of hafnia/hafnon composites exposed to molten silicate deposits 暴露在熔融硅酸盐沉积物中的哈夫纳/哈夫农复合材料起泡

IF 9.4 1区材料科学

Acta Materialia Pub Date : 2025-01-28 DOI: 10.1016/j.actamat.2025.120782

P.Y. Kumbhar, S.S. Shishvan, A.R. Ericks, C.G. Levi, F.W. Zok, V.S. Deshpande

{"title":"Blistering of hafnia/hafnon composites exposed to molten silicate deposits","authors":"P.Y. Kumbhar, S.S. Shishvan, A.R. Ericks, C.G. Levi, F.W. Zok, V.S. Deshpande","doi":"10.1016/j.actamat.2025.120782","DOIUrl":"https://doi.org/10.1016/j.actamat.2025.120782","url":null,"abstract":"Environmental barrier coatings (EBCs) are critical for protecting ceramic matrix composites in gas turbine engines. However, their effectiveness can be compromised by blistering when exposed to molten silicate deposits. This study investigates the mechanisms driving blistering in hafnia/hafnon EBCs through numerical modelling. Two potential mechanisms are explored: one driven by partial dissolution of the parent phases into the melt followed by crystallization into the other phase (hafnia to hafnon or vice-versa) and another driven by partial dissolution and reprecipitation into the same phase via Ostwald ripening. Models for both mechanisms make use of the observations that melt ingress and macroscopic blistering are decoupled in time, with melt ingress occurring relatively rapidly along grain triple junctions and blistering occurring later through a slower process of melt spreading, dissolution and crystallization or reprecipitation. A finite element model incorporating randomly shaped grains and cohesive grain boundaries is developed to simulate these two mechanisms. Phase transformation-driven cracking is found to produce minimal damage and negligible changes in pellet thickness, inconsistent with experimental observations. In contrast, the Ostwald ripening mechanism generates damage patterns and pellet thickness increases closely resembling experimental blistering observations, even though the ripening process produces only modest stresses. Combined effects of phase transformation and Ostwald ripening show no significant synergy. These findings suggest Ostwald ripening as the dominant mechanism responsible for blistering in hafnia/hafnon EBCs exposed to molten silicate deposits. The study provides valuable insights into EBC failure modes and offers a framework for investigations of similar phenomena in other coating systems.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"19 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143050654","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}

引用次数: 0

Microstructure evolution in multi-principal element alloy with millimeter-sized grains subjected to cyclic torsion

IF 9.4 1区材料科学

Acta Materialia Pub Date : 2025-01-27 DOI: 10.1016/j.actamat.2025.120766

L. Liu, Y. Liu, L.Y. Liu, Q.S. Pan, L. Lu

{"title":"Microstructure evolution in multi-principal element alloy with millimeter-sized grains subjected to cyclic torsion","authors":"L. Liu, Y. Liu, L.Y. Liu, Q.S. Pan, L. Lu","doi":"10.1016/j.actamat.2025.120766","DOIUrl":"https://doi.org/10.1016/j.actamat.2025.120766","url":null,"abstract":"In the previous report [Acta Materialia 275 (2024) 120059], the dislocation patterns and evolution process of fine-grained Al0.1CoCrFeNi multi-principal element alloy with an average grain size of 46 μm were investigated at varying cumulative plastic strains, γcu, by double-beam TEM observations. To further understand larger grain size effect, the mechanism of intrinsic dislocation activities in the same alloy with millimeter-sized grains at the same loading conditions was studied in this paper. Different from the extensive proliferation of multi-slip dislocation activities and the resultant randomly distributed Lomer-Cottrell (L-C) locks and cells in the fine-grained alloy, multiple dislocation slip containing less slip-systems and parallel ordered L-C locks are preferentially activated, consequently promoting the generation of profuse geometrically necessary boundaries (GNBs) in the interior of millimeter-sized grains. With further increasing γcu, the GNBs progressively increases in the density and decrease in spacing, which also accelerates the formation of ultrafine-scale dislocation cell pattern.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"59 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143050655","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}

引用次数: 0