Acta Materialia最新文献

{"title":"Transformation from Weaire-Phelan packing to thermally stable Euler crystals in polycrystalline face-centered cubic metals","authors":"Dan Yang ,&nbsp;Xiaoming Su ,&nbsp;Hongtao Xue ,&nbsp;Xiuyan Li ,&nbsp;Zhaohui Jin","doi":"10.1016/j.actamat.2025.121289","DOIUrl":"10.1016/j.actamat.2025.121289","url":null,"abstract":"<div><div>Based on the least area principle to fill up space and Weaire-Phelan (W-P) conjecture, polycrystalline face-centered cubic metals Cu, Ni and Al consisting of triply-distributed coherent twin-boundaries were modeled at grain sizes below 10 nm. Atomistic simulations showed that grain boundaries in such W-P crystals may transform promptly into a unique structure characterized by three perpendicular catenoids of minimal surfaces formally proved by mathematician Leonhard Euler. The adopted Euler crystal can be thermally stable up to more than 80 % of the melting point. Densely embedded Σ3 {111} coherent twins are critical agents to trigger the transformation as well as to stabilize the resultant minimal-surface structures. Our results add further evidence that the evolution of 3-dimensional grain boundary networks into saddle-shaped minimal-surface morphologies may enhance the thermal stability of nanograined polycrystals.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"296 ","pages":"Article 121289"},"PeriodicalIF":8.3,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144371045","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":"The role of lattice defects for structural, mechanical, and physical properties of HPT processed p-type skutterudite DD0.7Fe3CoSb12","authors":"Gerda Rogl ,&nbsp;Vilma Buršíková ,&nbsp;Vitaliy Romaka ,&nbsp;Peter Cengeri ,&nbsp;Jiri Buršík ,&nbsp;Erhard Schafler ,&nbsp;Michael Zehetbauer ,&nbsp;Peter Rogl","doi":"10.1016/j.actamat.2025.121290","DOIUrl":"10.1016/j.actamat.2025.121290","url":null,"abstract":"<div><div>HPT (high pressure torsion)-processed samples of p-type skutterudite DD_0.7Fe₃CoSb₁₂ were systematically investigated for clarifying the mechanisms behind the enhancements of mechanical properties and particularly of the thermoelectric figure of merit ZT. For the first time we combined experiments (differential scanning calorimetry, X-ray diffractometry, energy dispersive spectroscopy, and scanning electron microscopy) with calculations by density functional theory (DFT). The results demonstrated that the individual thermal stabilities of lattice defects from HPT-processing with special respect to their densities and arrays are responsible for the properties observed. The mechanical properties are mainly governed by dislocations and grain boundaries, while the thermoelectric figure of merit ZT is affected by the generation and annihilation of vacancy type defects: These allow for the formation of low-angle grain boundaries out of the HPT induced dislocations with increasing misorientation between the grains as a function of deformation and annealing temperature. In contrast to simply entangled dislocation cell walls, these low/high angle grain boundaries account for a minimum of the product of resistivity and thermal conductivity, and thus of a maximum of ZT. DFT calculations not only provided formation energies of vacancies for the three atom sites in NdFe₄Sb₁₂ and NdCo₄Sb₁₂, but also insight on the stabilities of these compounds. The Nd vacancy formation in NdCo₄Sb₁₂ is the least energy-demanding, which makes the structure more stable than e.g. the Nd vacancy formation in NdFe₄Sb₁₂, where decreasing electron deficit competes with increasing structure distortion.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"296 ","pages":"Article 121290"},"PeriodicalIF":8.3,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144479488","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":"Geometrically Morphological Theory in predictions of dendritic shapes with six-fold crystalline symmetry","authors":"Liubov V. Toropova ,&nbsp;Peter K. Galenko ,&nbsp;Dmitri V. Alexandrov","doi":"10.1016/j.actamat.2025.121232","DOIUrl":"10.1016/j.actamat.2025.121232","url":null,"abstract":"<div><div>Motivated by important applications in materials physics, we study the shape of dendritic crystals with six-fold crystalline symmetry grown in aqueous solutions of various substances and pure water. Based on recently developed Geometrically Morphological Theory [Philos. Trans. R. Soc. A 378 (2020) 20190243; Phys. Lett. A 501 (2024) 129375] we demonstrate that the shape of the main stem and internal/external envelope in the secondary branches of dendrite at the steady-state growth mode is described by the scaling law <span><math><mrow><mi>z</mi><mrow><mo>(</mo><mi>x</mi><mo>)</mo></mrow><mo>∝</mo><mo>−</mo><mo>|</mo><mi>x</mi><msup><mrow><mo>|</mo></mrow><mrow><mi>n</mi></mrow></msup></mrow></math></span> with the values of exponent <span><math><mrow><mi>n</mi><mo>=</mo><mn>3</mn><mo>.</mo><mn>0</mn></mrow></math></span> and <span><math><mrow><mi>n</mi><mo>=</mo><mn>1</mn><mo>.</mo><mn>0</mn></mrow></math></span> for ice dendrites growing in solutions of <em>Secale cereale</em>, glucose, sucrose and pure water. In addition, by changing the crystalline symmetry from six- to four-fold, the scaling law exponent and the crystallographic growth direction change from <span><math><mrow><mi>n</mi><mo>=</mo><mn>1</mn><mo>.</mo><mn>0</mn></mrow></math></span> to <span><math><mrow><mi>n</mi><mo>=</mo><mn>1</mn><mo>.</mo><mn>164</mn></mrow></math></span> and <span><math><mrow><mi>&lt;</mi><mn>110</mn><mi>&gt;</mi></mrow></math></span> to <span><math><mrow><mi>&lt;</mi><mn>100</mn><mi>&gt;</mi></mrow></math></span>, respectively. The evolutionary route of how dendrites reach steady-state growth velocity is also described by supporting and finding parameters from laboratory experiments.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"296 ","pages":"Article 121232"},"PeriodicalIF":8.3,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144341416","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":"Unusual synchronous behavior of polarization and relaxation in Aurivillius superlattice","authors":"S. Liu ,&nbsp;T. Ochirkhuyag ,&nbsp;W. Feng ,&nbsp;B. He ,&nbsp;L. Wu ,&nbsp;H. Qi ,&nbsp;J. Chen ,&nbsp;W. Wang ,&nbsp;H. Zheng ,&nbsp;Y. Liu ,&nbsp;D. Odkhuu","doi":"10.1016/j.actamat.2025.121184","DOIUrl":"10.1016/j.actamat.2025.121184","url":null,"abstract":"<div><div>Bismuth layer-structure ferroelectric (BLSF) materials have potential for energy storage applications because of their high-temperature stability and excellent resistance to electric breakdown; however, they suffer from an asynchronous behavior of polarization and relaxation upon an impurity element. Herein, using systematic computational and experimental investigations, we report that, in sharp contrast to typical perovskite and bismuth layer-structure ferroelectric structures, the high-content La in Bi<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>TiNbO<span><math><msub><mrow></mrow><mrow><mn>9</mn></mrow></msub></math></span> can produce greatly enhanced dielectric relaxation and out-of-plane polarization simultaneously. The underlying mechanism is the manipulation of La-O bonds within sequence-disordered Bi<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>O<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> layered counterpart rather than the quasiperovskite counterpart in the <span><math><mrow><mi>F</mi><mi>m</mi><mi>m</mi><mi>m</mi></mrow></math></span> phase dominant superlattice, which is essentially contrariwise in the <span><math><mrow><mi>A</mi><msub><mrow><mn>2</mn></mrow><mrow><mn>1</mn></mrow></msub><mi>a</mi><mi>m</mi></mrow></math></span> phase dominant sample prepared in most previous experiments. Furthermore, we demonstrate that atomic defect engineering, specifically line dislocation resulting from the replacement of Bi with La<span><math><msup><mrow></mrow><mrow><mn>3</mn><mo>+</mo></mrow></msup></math></span> ions in Bi<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>TiNbO<span><math><msub><mrow></mrow><mrow><mn>9</mn></mrow></msub></math></span>, can provide an additional out-of-plane polarization. As a result, a high recoverable energy density <span><math><msub><mrow><mi>W</mi></mrow><mrow><mi>rec</mi></mrow></msub></math></span> of 8.7 J/cm<span><math><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></math></span> and efficiency <span><math><mi>η</mi></math></span> of 80.5%, together with excellent thermal stability and an ultra-fast discharge rate, are achieved in Bi<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>LaTiNbO<span><math><msub><mrow></mrow><mrow><mn>9</mn></mrow></msub></math></span> superlattice. The present results yield a significant advance in the research field of dielectric energy storage of BLSF-based ceramics, suggesting a new paradigm that may stimulate the development of high-temperature, high-performance energy storage capacitors.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"296 ","pages":"Article 121184"},"PeriodicalIF":8.3,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144341428","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":"Crystallographic correspondences and variant selection in zirconia-based shape memory ceramics: Insights from EBSD mapping","authors":"A. Slagter,&nbsp;C.A. Schuh","doi":"10.1016/j.actamat.2025.121286","DOIUrl":"10.1016/j.actamat.2025.121286","url":null,"abstract":"<div><div>Previous studies of the martensitic transformation in zirconia ceramics have suggested a preference for specific lattice correspondences based on lattice invariant shear minimization. However, these conclusions have largely been drawn from limited datasets, primarily obtained via transmission electron microscopy. In this work, we employ advanced Electron Backscatter Diffraction (EBSD) methods to statistically analyze the distribution of martensite variants in ZrO₂-CeO₂ alloys. By leveraging novel techniques that resolve the long-standing pseudosymmetry problem in tetragonal zirconia, we demonstrate the simultaneous presence of all twenty-four possible martensitic variants, encompassing three lattice correspondences and two distinct orientation relationships. Our findings challenge the conventional assumption that a single dominant correspondence governs the transformation, and reveal a significant role for self-accommodation mechanisms in variant selection. These results offer new insights into the crystallographic factors governing martensitic transformations in zirconia and open new pathways for microstructural design in shape memory ceramics.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"296 ","pages":"Article 121286"},"PeriodicalIF":8.3,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144370981","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":"Predicting hydrogen storage properties of multicomponent metal hydrides: Modeling of pressure, capacity, hysteresis, and slope","authors":"Peter Hannappel ,&nbsp;Marcus Vogt ,&nbsp;Felix Heubner ,&nbsp;Mateusz Balcerzak ,&nbsp;Thomas Weißgärber","doi":"10.1016/j.actamat.2025.121226","DOIUrl":"10.1016/j.actamat.2025.121226","url":null,"abstract":"<div><div>Metal hydrides are considered as an important group of materials in the future hydrogen-based economy. Their development is mostly based on time-consuming experimental trial-and-error methods. This work accelerates this pathway using a computational framework for the thermodynamic modeling of metal hydrides under para-equilibrium conditions. By employing the CALPHAD method on a six-component AB₅-type (Ce,<!--> <!-->La)(Ni,<!--> <!-->Al,<!--> <!-->Fe,<!--> <!-->Mn)₅–H system, we are able to make precise predictions regarding hydrogen absorption enthalpies, plateau pressures, and hydrogen sorption capacities. Additionally, this is the first time the hydrogenation/dehydroganation hysteresis effect has been successfully modeled using separate thermodynamic databases for hydrogen absorption and desorption. Furthermore, we introduce a method to directly calculate sloped pressure–composition–temperature (PCT) curves from X-ray diffraction data. This validation demonstrates the framework’s capability to assess the hydrogen storage properties of complex multi-component systems in an efficient manner. This work lays the groundwork for future metal hydride thermodynamic studies on a variety of material classes, as well as optimization of alloys for applications even beyond classical hydrogen storage.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"296 ","pages":"Article 121226"},"PeriodicalIF":8.3,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144371039","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":"Segregation and ordering of light interstitials (B, C, H, and N) in Cr–Ni alloys: Implications for grain boundary stability in superalloy design","authors":"Tyler D. Doležal ,&nbsp;Rodrigo Freitas ,&nbsp;Ju Li","doi":"10.1016/j.actamat.2025.121221","DOIUrl":"10.1016/j.actamat.2025.121221","url":null,"abstract":"<div><div>The segregation and ordering behavior of light interstitials (B, C, and N) in Cr₃₀Ni is examined as these elements are critical for grain boundary (GB) stability and high-temperature mechanical performance in Ni-based superalloys. Using Monte Carlo simulations, we identify the chemical and structural preferences of these interstitials in both bulk and GB environments, aligning with experimental segregation and precipitation trends. Boron strongly prefers GBs over the bulk, where it enhances GB cohesion and stabilizes the GB structure. Uniquely, boron induces a structural transformation at higher concentrations, hinting at the formation of serrated GBs where boron content is high, which improves high-temperature mechanical performance. Carbon and nitrogen form carbide- and nitride-like motifs and exhibit limited GB solubility, reinforcing their precipitation tendencies. In support of ongoing hydrogen embrittlement mitigation strategies, we also examined hydrogen behavior. Hydrogen demonstrated chemical stability in the CrNi GB zone, suggesting it may preferentially migrate inward along Cr- and Ni-rich GBs while avoiding Mo-enriched regions, further supporting Mo’s role in mitigating embrittlement. These findings suggest that Mo-containing borides may serve as effective barriers against hydrogen-induced degradation by inhibiting H ingress and stabilizing GB cohesion. By elucidating the chemical and structural preferences of these light interstitials, this work provides a robust computational framework for guiding superalloy design toward improved high-temperature grain boundary stability, resistance to hydrogen embrittlement, and controlled chemical ordering.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"296 ","pages":"Article 121221"},"PeriodicalIF":8.3,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144371046","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":"Tunable lamb wave bandgap based on 90° diffuse domain walls in ferroelectric thin films","authors":"Sizheng Zheng ,&nbsp;Xu Hou ,&nbsp;Peng Han ,&nbsp;Tao Xu ,&nbsp;Takahiro Shimada ,&nbsp;Jie Wang","doi":"10.1016/j.actamat.2025.121284","DOIUrl":"10.1016/j.actamat.2025.121284","url":null,"abstract":"<div><div>Ferroelectric and piezoelectric thin films hold significant potential for tunable acoustic devices. While the elastodynamic properties of ferroelectric thin films have been studied for various domain structures, the influence of diffuse domain walls on acoustic waves remains unexplored. In this study, using a phase-field perturbation model, the effect of 90° diffuse domain walls on Lamb wave propagation in ferroelectric thin films is investigated. Modal analysis reveals that the local negative shear modulus induces localized shear vibrations within the diffuse domain walls, disrupting the symmetry of Lamb wave mode in ferroelectric thin films. This disruption further leads to strong coupling between distorted symmetric and antisymmetric Lamb modes, resulting in multiple bandgap formations. The bandgaps can be successfully tuned through changing the spacing of domain walls, which can be easily realized by applying external strains or electric fields. In addition, the nonlinear scaling laws are predicted for the bandgaps, which are in good agreement with previous experimental reports. This work suggests an effective method for designing tunable acoustic metamaterials based on ferroelectric thin films.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"296 ","pages":"Article 121284"},"PeriodicalIF":8.3,"publicationDate":"2025-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144337645","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":"Dislocation density measurements on Mg alloys reveal surprising temperature dependences","authors":"Michael Ritzo ,&nbsp;Jishnu Bhattacharyya ,&nbsp;Péter Nagy ,&nbsp;Gergely Farkas ,&nbsp;Jenő Gubicza ,&nbsp;Kristián Máthis ,&nbsp;Sean Agnew","doi":"10.1016/j.actamat.2025.121273","DOIUrl":"10.1016/j.actamat.2025.121273","url":null,"abstract":"<div><div>There has been tremendous worldwide effort to determine the deformation mechanisms responsible for the behavior of Mg and other non-cubic metal alloys. Here, <em>ex-situ</em> X-ray line profile analysis (XLPA) and electron backscattered diffraction (EBSD) are employed to examine the densities of dislocations with 〈a〉, 〈c〉 and 〈<em>c</em> + <em>a</em>〉 Burgers vectors within Mg alloy sheet materials tested in uniaxial tension at various temperatures. EBSD reveals geometrically necessary dislocation (GND) accumulation near grain boundaries during low-temperature plasticity, whereas GNDs are primarily associated with grain subdivision after high-temperature deformation. Similar to previous studies, the current XLPA results suggest that the relative density of 〈a〉 dislocations drops with increasing temperature more rapidly than 〈c〉 and 〈<em>c</em> + <em>a</em>〉. This implies that non-basal slip is more prevalent at elevated temperatures. However, published <em>in-situ</em> XLPA and the present noise-filtered EBSD measurements of GNDs suggest only weak temperature dependence of the relative densities. The fraction of &lt;<em>a</em>&gt;-type GNDs actually <em>increases</em> slightly with temperature. It is hypothesized that 〈a〉 dislocations are more prone to recover, be incorporated into dislocation walls, than are 〈c〉 or 〈<em>c</em> + <em>a</em>〉 dislocations because such recovery would render 〈a〉 dislocations less “visible” to the XLPA approach. These experimental results provide support for a recently published polycrystal model (Ritzo <em>et</em> al. <em>Mater. Sci. Eng. A.</em> 839 (2022) 142,581) which suggested that increased amounts of 〈a〉 dislocation climb could account for the observed changes in plastic anisotropy, texture evolution, rate sensitivity, and activation energy, which occur as the temperature approaches and exceeds half of the melting temperature.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"296 ","pages":"Article 121273"},"PeriodicalIF":8.3,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335174","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":"Achieving efficient damping performance tuning in NiTi alloy via laser powder bed fusion","authors":"Shiyu Zhong ,&nbsp;Jun Song ,&nbsp;Ying Li ,&nbsp;Lei Zhang ,&nbsp;Shuo Wang ,&nbsp;Xu Zheng ,&nbsp;Bo Song ,&nbsp;Dingfei Zhang ,&nbsp;Jian Lu","doi":"10.1016/j.actamat.2025.121281","DOIUrl":"10.1016/j.actamat.2025.121281","url":null,"abstract":"<div><div>NiTi alloys exhibit an impressive damping effect at the damping peak temperature (<em>T_p</em>), and aligning <em>T_p</em> with target temperatures presents significant application value. Traditionally, tuning the damping performance of NiTi alloys demands precise modifications to raw material composition and complex thermomechanical processing. This study achieved an efficient tuning of <em>T_p</em> across a broad 93 K range via laser powder bed fusion (LPBF), eliminating the need for material modifications and complex treatments. Comprehensive experiments and simulations were conducted to reveal the mechanism. Adjusting the laser scanning speed during LPBF modulated the laser–powder interaction, resulting in variations in temperature, lifespan, and volume of the molten pool. These variations facilitated the manipulation of Ni evaporation, enabling the regulation of Ni content and, thus, the tuning of <em>T_p</em>. Notably, a 0.1 at. % increase in Ni content resulted in a 7.55 K decrease in <em>T_p</em>. Despite the efficient tuning of <em>T_p</em>, the damping peak intensity remained high (0.06–0.11), indicating the preservation of the desired damping effect. Additionally, this study discusses the composition and influencing factors of damping peaks in LPBF NiTi alloys. Furthermore, high-damping, lightweight NiTi porous structures were fabricated by LPBF, highlighting the unique advantages over conventional routines. Overall, this study provides new insights and a framework for the efficient tuning of damping performance in NiTi alloys, paving the way for advanced applications of high-damping materials.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"296 ","pages":"Article 121281"},"PeriodicalIF":8.3,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335173","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}