Acta Materialia最新文献_第3页

Modulated clustering and precipitation in an Al–Mg–Si alloy AA 6014 via enhanced pre-aging 增强预时效对Al-Mg-Si合金AA 6014中团簇和析出的调制

IF 9.4 1区材料科学

Acta Materialia Pub Date : 2025-05-23 DOI: 10.1016/j.actamat.2025.121164

Meng Liu, Qianning Guo, Jingwei Zhao, Zhenshan Liu, Kaixin Chen, Yiheng Cao, Ting Chen, Feng Qian, Shiwei Pan, Xingzhong Cao, Huan Zhao, Gang Sha, Zi Yang, John Banhart, Pizhi Zhao

{"title":"Modulated clustering and precipitation in an Al–Mg–Si alloy AA 6014 via enhanced pre-aging","authors":"Meng Liu, Qianning Guo, Jingwei Zhao, Zhenshan Liu, Kaixin Chen, Yiheng Cao, Ting Chen, Feng Qian, Shiwei Pan, Xingzhong Cao, Huan Zhao, Gang Sha, Zi Yang, John Banhart, Pizhi Zhao","doi":"10.1016/j.actamat.2025.121164","DOIUrl":"https://doi.org/10.1016/j.actamat.2025.121164","url":null,"abstract":"The effect of an additional short spike aging treatment (SA: 180 to 220°C, in tens of seconds) between solution heat treatment and conventional pre-aging (PA: 85°C, in hours) on the mechanical properties of an AA 6014 alloy after paint baking was evaluated. Tensile tests show that such enhanced pre-aging including SA and PA can significantly improve the paint bake response compared to conventional pre-aging (PA only). To interpret this phenomenon, Positron Annihilation Lifetime Spectroscopy, Electrical Resistivity Measurements, Differential Scanning Calorimetry, Transmission Electron Microscopy, Atom Probe Tomography and MatCalc calculations were applied to identify the microstructural changes in different aging stages. It is found that the excess vacancies available after quenching assist in rapid nucleation of clusters during SA, which grow during subsequent PA and transform easily to β\" precipitates during paint baking owing to their similar chemistry. The densely distributed β\" precipitates are considered responsible for the improved paint bake strength as thy efficiently hinder dislocation movement.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"26 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144133737","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

Design of superalloys with multiple properties via multi-task learning 基于多任务学习的多性能高温合金设计

IF 8.3 1区材料科学

Acta Materialia Pub Date : 2025-05-22 DOI: 10.1016/j.actamat.2025.121161

Weiren Wang , Xue Jiang , Wenyao Li , Chi Zhang , Pei Liu , Shaohan Tian , Turab Lookman , Yanjing Su

{"title":"Design of superalloys with multiple properties via multi-task learning","authors":"Weiren Wang , Xue Jiang , Wenyao Li , Chi Zhang , Pei Liu , Shaohan Tian , Turab Lookman , Yanjing Su","doi":"10.1016/j.actamat.2025.121161","DOIUrl":"10.1016/j.actamat.2025.121161","url":null,"abstract":"<div><div>The development of new materials requires the collaborative design of multiple properties, requiring an analysis of the interactions amongst material composition, processing methods, and individual properties. Traditional data-driven materials design approaches typically rely on single-task models that operate independently, often neglecting the shared insights across related tasks. To overcome this limitation, we propose a collaborative design framework that employs multi-task learning for the development of novel Co-based superalloys. In this framework, six thermodynamic and microstructural property tasks share a common encoder, which effectively captures the underlying influence of alloy compositions across different properties. Each task then utilizes its own dedicated decoder to ensure precise predictions. As a result, the average normalized error for the predictions of the six properties is reduced by 37.5 % compared to conventional single-task learning methods. Furthermore, latent high-dimensional variables are extracted from the common encoder, and utilized to identify promising exploration directions for optimal properties, as indicated by the projection of these variables, which aids in screening new alloys. We successfully designed new alloys that satisfy the targeted criteria: low density (<9 g cm<sup>-3</sup>), suitable freezing ranges (<60 °C) and processing windows (>80 °C), optimal γ′ sizes (<550 nm after aging at 1100 °C for 168 h and <200 nm after aging at 1000 °C for 24 h), high γ′ solvus temperature (>1200 °C) without detrimental phases, and strong oxidation resistance. This framework represents a promising approach for collaborative materials design, leveraging shared information to enhance the development of multiple properties.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"294 ","pages":"Article 121161"},"PeriodicalIF":8.3,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144113792","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

Grain boundary segregation in BCC vanadium-based alloys: Quantum-accurate computed segregation spectra and targeted experimental validations BCC钒基合金的晶界偏析：量子精确计算偏析光谱和目标实验验证

IF 8.3 1区材料科学

Acta Materialia Pub Date : 2025-05-22 DOI: 10.1016/j.actamat.2025.121169

Malik Wagih , Tianjiao Lei , Daniel Ng , Christopher A. Schuh

{"title":"Grain boundary segregation in BCC vanadium-based alloys: Quantum-accurate computed segregation spectra and targeted experimental validations","authors":"Malik Wagih , Tianjiao Lei , Daniel Ng , Christopher A. Schuh","doi":"10.1016/j.actamat.2025.121169","DOIUrl":"10.1016/j.actamat.2025.121169","url":null,"abstract":"<div><div>Grain boundaries are critically important to the material performance of fusion reactor materials such as vanadium, particularly mechanical properties and irradiation resistance. A key challenge to the design and control of grain boundaries in vanadium alloys is the lack of quantitative data on grain boundary segregation. In this study, we combine computational and experimental methods to address this gap. Using a machine learning-accelerated quantum mechanics/molecular mechanics approach, we calculated the segregation spectra for 28 transition metal elements in polycrystalline vanadium, and validated these predictions experimentally for a subset of solutes that sample a range of segregation behavior, specifically zirconium, titanium, and tungsten, using analytical transmission electron microscopy. The agreement between experiment and theory highlights the predictive capability of our approach. Critically, this work provides a comprehensive database of quantum-accurate solute segregation enthalpies in vanadium, enabling the development of advanced alloys for fusion reactors applications.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"294 ","pages":"Article 121169"},"PeriodicalIF":8.3,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144113790","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

Ruthenium-cobalt oxide solid solution nanofiber: a robust bifunctional electrocatalyst for overall water splitting with superior ampere-grade-current-density electrocatalytic performance 钌钴氧化物固溶体纳米纤维：一种强大的双功能电催化剂，具有优越的安培级电流密度电催化性能

IF 8.3 1区材料科学

Acta Materialia Pub Date : 2025-05-22 DOI: 10.1016/j.actamat.2025.121165

Xianqiang Yu , Ruikai Qi , Linfeng Zhang , Li Deng , Mengxiao Zhong , Zheng-jie Chen , Xiaofeng Lu

{"title":"Ruthenium-cobalt oxide solid solution nanofiber: a robust bifunctional electrocatalyst for overall water splitting with superior ampere-grade-current-density electrocatalytic performance","authors":"Xianqiang Yu , Ruikai Qi , Linfeng Zhang , Li Deng , Mengxiao Zhong , Zheng-jie Chen , Xiaofeng Lu","doi":"10.1016/j.actamat.2025.121165","DOIUrl":"10.1016/j.actamat.2025.121165","url":null,"abstract":"<div><div>Constructing high-performance bifunctional electrocatalysts for water electrolysis under an ampere-grade current density is crucial for practical application. Herein, ruthenium-cobalt oxide (RuCoO<sub>x</sub>) solid solution nanofibers (SSNFs) are fabricated as robust bifunctional electrocatalyst for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Typically, the optimized Ru<sub>2</sub>Co<sub>1</sub>O<sub>x</sub> SSNFs exhibit an ultra-low overpotential of 362 mV at 1000 mA cm<sup>-2</sup> for OER, not only significantly superior to the prepared RuO<sub>x</sub> nanofibers (NFs), CoO<sub>x</sub> and commercial RuO<sub>2</sub> catalyst but also outperforming many reported typical OER electrocatalysts. In addition, the representative Ru<sub>1</sub>Co<sub>1</sub>O<sub>x</sub> SSNFs catalyst presents a good HER performance with an overpotential of only 149 mV at 1000 mA cm<sup>-2</sup> and excellent stability over 120 h, surpassing the benchmark Pt/C catalyst. Furthermore, these catalysts are assembled to construct an alkaline overall water splitting cell, demonstrating a better performance than most of the recently reported water electrolyzers. Density functional theory calculations reveal that the addition of Co effectively modulates the <em>d</em>-orbitals of Ru and reduces the reaction energy barriers of O*→OOH*, benefitting to enhance the OER property. Additionally, the hybridization of Co and Ru is beneficial for modulating the strength of H* adsorption in an alkaline solution, which promotes the alkaline HER efficiency.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"294 ","pages":"Article 121165"},"PeriodicalIF":8.3,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144113788","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

On the mobility of dislocations intersecting {112} free surfaces in Cu 铜中与{112}自由面相交的位错迁移率

IF 9.4 1区材料科学

Acta Materialia Pub Date : 2025-05-22 DOI: 10.1016/j.actamat.2025.121170

Ta Duong, Michael J. Demkowicz

{"title":"On the mobility of dislocations intersecting {112} free surfaces in Cu","authors":"Ta Duong, Michael J. Demkowicz","doi":"10.1016/j.actamat.2025.121170","DOIUrl":"https://doi.org/10.1016/j.actamat.2025.121170","url":null,"abstract":"We perform atomistic simulations to study the motion of edge dislocations intersecting {112} free surfaces in Cu. For dislocations of length ≥11nm, intersections with the free surface exert a drag force that reduces mobility. This force increases with velocity and appears to diverge below the Rayleigh wave speed (<span><span><math><mrow is=\"true\"><msub is=\"true\"><mi is=\"true\">c</mi><mi is=\"true\">R</mi></msub><mrow is=\"true\"><mo is=\"true\">)</mo></mrow></mrow></math></span><script type=\"math/mml\"><math><mrow is=\"true\"><msub is=\"true\"><mi is=\"true\">c</mi><mi is=\"true\">R</mi></msub><mrow is=\"true\"><mo is=\"true\">)</mo></mrow></mrow></math></script></span>. New dislocations emitted from the surface effectively prevent the intersections from exceeding <span><span><math><msub is=\"true\"><mi is=\"true\">c</mi><mi is=\"true\">R</mi></msub></math></span><script type=\"math/mml\"><math><msub is=\"true\"><mi is=\"true\">c</mi><mi is=\"true\">R</mi></msub></math></script></span>. For line lengths below 11nm, dislocations additionally excite Lamb (bending) waves in the medium. Resonances with these waves generate new subsonic branches in the stress-velocity relation, giving rise to intermittent fluctuations in dislocation velocity at constant imposed strain rate. These findings exhibit qualitative differences to the behavior of dislocations under periodic boundaries, suggesting that experiments measuring mobilities from the displacements of dislocation intersections with free surfaces may not fully represent the behavior of dislocations within crystal interiors, especially at near-sonic velocities and above.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"236 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144113791","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

Understanding the synergistic Co-Mo effect in maraging steels: redistribution of solute atoms 理解马氏体时效钢中的协同Co-Mo效应：溶质原子的再分配

IF 8.3 1区材料科学

Acta Materialia Pub Date : 2025-05-22 DOI: 10.1016/j.actamat.2025.121171

Jong-Kwan Lee, Seon-Gyu Kim, Donghwa Lee, Byeong-Joo Lee

引用次数: 0

Diffusion mechanism of Zr-4 alloy at ultra-low temperature based on the α→β phase transition promoted by thermo-hydrogen treatment 基于热氢处理促进α→β相变的Zr-4合金超低温扩散机制

IF 8.3 1区材料科学

Acta Materialia Pub Date : 2025-05-21 DOI: 10.1016/j.actamat.2025.121156

Yingkai Ma , Qing Chang , Hairui Ding , Zhan Sun , Xinrui Guo , Weimin Long , Zhenwen Yang , Ying Wang , Lixia Zhang

{"title":"Diffusion mechanism of Zr-4 alloy at ultra-low temperature based on the α→β phase transition promoted by thermo-hydrogen treatment","authors":"Yingkai Ma , Qing Chang , Hairui Ding , Zhan Sun , Xinrui Guo , Weimin Long , Zhenwen Yang , Ying Wang , Lixia Zhang","doi":"10.1016/j.actamat.2025.121156","DOIUrl":"10.1016/j.actamat.2025.121156","url":null,"abstract":"<div><div>To achieve low-temperature robust diffusion bonding of Zr-4 alloys, thermo-hydrogen treatment (THT) has been conducted prior to the bonding process. After the THT, the bonding temperature can be reduced by 100 °C (achieving the same bonding strength of 200 MPa). The typical microstructure of hydrogenated Zr-4 alloy at room temperature was composed of precipitated hydrides (γ-ZrH, δ-ZrH<sub>1.66</sub>, ε-ZrH<sub>2</sub>) and α-Zr matrix. The in-situ XRD results at 550 °C∼700 °C indicated that the γ-ZrH δ-ZrH<sub>1.66</sub>, and ε-ZrH<sub>2</sub> decreased gradually, the ζ-ZrH<sub>0.25</sub> and β<sub>H</sub>-Zr formed with the rising temperature. DSC data indicated that the α→β phase transition temperature was decreased from 825 °C to 550 °C after the Zr-4 alloy was subjected to THT. According to the molecular dynamics (MD) results, the diffusion coefficient of Zr atoms in the β-Zr lattice was 1.36 × 10<sup>–6</sup> nm<sup>2</sup>·ps<sup>-1</sup> which was much higher than that in the α-Zr lattice (2.24 × 10<sup>–8</sup> nm<sup>2</sup>·ps<sup>-1</sup>). After the phase transition, the vacancy and interstitial diffusion formation energy significantly reduced from 2.61 eV and 3.67 eV to -0.6 eV and -1.0 eV, corresponding to the abundant defects as shown in-situ TEM images of β (β<sub>H</sub>) at 650 °C. The vacancy and interstitial diffusion activation energy of Zr atoms in β<sub>H</sub>-Zr lattices were reduced from 3.22 eV and 3.92 eV to 1.3 eV and 0.1 eV. Thus, the hydrogen-induced phase transition and the formation of the β<sub>H</sub>-Zr phase were confirmed as the key factors in achieving low-temperature diffusion bonding of Zr-4 alloys.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"294 ","pages":"Article 121156"},"PeriodicalIF":8.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144113343","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

Structure-to-Process Modeling Drives Experimentally Validated Unified Dual-Phase Steel 结构-工艺建模驱动实验验证的统一双相钢

IF 9.4 1区材料科学

Acta Materialia Pub Date : 2025-05-21 DOI: 10.1016/j.actamat.2025.121167

Xudong Ma, Yuqi Zhang, Chenchong Wang, Ming Wang, Mingxin Huang, Wei Xu

{"title":"Structure-to-Process Modeling Drives Experimentally Validated Unified Dual-Phase Steel","authors":"Xudong Ma, Yuqi Zhang, Chenchong Wang, Ming Wang, Mingxin Huang, Wei Xu","doi":"10.1016/j.actamat.2025.121167","DOIUrl":"https://doi.org/10.1016/j.actamat.2025.121167","url":null,"abstract":"Unified dual-phase (UniDP) steels enable tailored performance from a single composition, revolutionizing sustainable material systems by addressing recyclability and weldability challenges. Traditional design frameworks, constrained by forward \"process-structure\" models and costly uncertainty quantification, falter under sparse data and complex microstructures. Here, a microstructure-centric inverse design strategy is proposed that replaces uncertainty quantification with direct \"structure-to-composition/process modeling\", leveraging real microstructural features to map composition and processing parameters. Specifically, our approach integrates a variational autoencoder to encode authentic microstructural features into a latent space and a multilayer perceptron to predict composition, processing routes, and properties. Combined with specific latent space sampling, the framework achieves high-efficacy design exploration. The experimental success of UniDP steels stands as a cornerstone of this work: the designed alloy consistently achieves the target properties in all three performance tiers, at a lower cost than other commercial alloys. Latent space analysis further validated the model's ability to interpolate seamlessly between microstructures and encode multi-scale property relationships, confirming its robustness for real-world applications. By experimentally demonstrating the viability of microstructure-driven inverse design, this work not only resolves longstanding barriers in complex alloy systems but also establishes a replicable, uncertainty quantification-free framework for sustainable material innovation.","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"94 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144113793","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

Plastic anisotropy in pearlite: A molecular dynamics study with insights from the periodic bicrystal model 珠光体的塑性各向异性：周期性双晶模型的分子动力学研究

IF 8.3 1区材料科学

Acta Materialia Pub Date : 2025-05-21 DOI: 10.1016/j.actamat.2025.121100

Kai Liu , Fei Shuang , Marcel H.F. Sluiter

{"title":"Plastic anisotropy in pearlite: A molecular dynamics study with insights from the periodic bicrystal model","authors":"Kai Liu , Fei Shuang , Marcel H.F. Sluiter","doi":"10.1016/j.actamat.2025.121100","DOIUrl":"10.1016/j.actamat.2025.121100","url":null,"abstract":"<div><div>Cold-drawn pearlite wire is widely used in industry due to its exceptional high strength. Understanding the deformation mechanisms during the cold-drawing process of pearlite, particularly the deformation and decomposition of cementite, is of great significance. In this study, a bicrystal model tailored to lamellar structures is developed to calculate the elastic properties and stress concentration of pearlite. By analyzing slip activation in both ferrite and cementite, along with the yield strength, we reveal the significant influence of loading direction on pearlite deformability. Notably, the yield strength varies from 9.5 GPa to 17.0 GPa. Under specific loading conditions, plastic deformation is observed to initiate in cementite, challenging the conventional assumption that slip bands always originate in ferrite. Furthermore, factors that influence the plastic deformation of pearlite are discussed. A successive strengthening mechanism is proposed to explain the excellent deformability and high strength of pearlite after extensive deformation.</div><div>This work introduces a novel method for directional loading of lamellar structures. The surprising finding that plastic deformation, without fracture, can initiate in cementite, might offer directions for developing other structural materials with extreme tensile strength and deformability.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"294 ","pages":"Article 121100"},"PeriodicalIF":8.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144113342","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

Plastic deformation of CaTiO3 perovskite under extreme loading CaTiO3钙钛矿在极端载荷下的塑性变形

IF 8.3 1区材料科学

Acta Materialia Pub Date : 2025-05-21 DOI: 10.1016/j.actamat.2025.121166

Boya Li , Shiteng Zhao , Marc A. Meyers

{"title":"Plastic deformation of CaTiO3 perovskite under extreme loading","authors":"Boya Li , Shiteng Zhao , Marc A. Meyers","doi":"10.1016/j.actamat.2025.121166","DOIUrl":"10.1016/j.actamat.2025.121166","url":null,"abstract":"<div><div>Perovskites are important functional materials in modern technology, with numerous applications in optoelectronics, such as solar cells and LEDs, lasers, and other fields. Importantly, the lower Earth mantle is predominantly composed of perovskite. (Mg, Fe)SiO<sub>3</sub> and CaSiO<sub>3</sub>, two of the most abundant minerals in the Earth's mantle, are not amenable to being investigated at ambient conditions because they are not stable. CaTiO<sub>3</sub> serves as an excellent analogue. Thus, high-energy laser shock compression was employed to investigate the deformation mechanisms and mechanical behavior of [010] oriented CaTiO<sub>3</sub> under extreme pressure and temperature conditions comparable to those in the mantle, albeit at significantly higher strain rates. The shear stress generated by the 70 GPa shock stress was equal to approximately 20 GPa, assuming elasticity. This is significantly higher than the Peierls-Nabarro stress required to move dislocations, around 10 GPa. In agreement with this, transmission electron microscopy revealed the generation of profuse perpendicular dislocations in [110](001) and [<span><math><mover><mn>1</mn><mo>¯</mo></mover></math></span>10](001) slip systems. The dislocation density ranged from 15×10<sup>12</sup> m<sup>−2</sup> to 2×10<sup>12</sup> m<sup>−2</sup> within 12 µm from the shocked surface. Additionally, antiphase domain boundaries along [010] and [100] were observed under the high-pressure shock conditions. CaTiO<sub>3</sub> deforms mainly through dislocation motion due to its positive Clapeyron slope and high atomic packing factor. This study sheds light upon the plastic deformation of (Mg, Fe)SiO<sub>3</sub> and CaSiO<sub>3</sub>, which comprise most of the lower earth mantle.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"294 ","pages":"Article 121166"},"PeriodicalIF":8.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144113341","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