Scripta Materialia最新文献_第6页

Discontinuous long-period stacking ordered structures induced serrated twin boundaries in a Mg-Gd-Zn alloy 在Mg-Gd-Zn合金中，不连续的长周期堆积有序结构诱发了锯齿孪晶界

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2025-09-01 DOI: 10.1016/j.scriptamat.2025.116965

Zhimeng Duan , Yan Ma , Zhanxin Wang , Linlin Liu , Jian Wang , Lihua Wang , Xiaodong Han

{"title":"Discontinuous long-period stacking ordered structures induced serrated twin boundaries in a Mg-Gd-Zn alloy","authors":"Zhimeng Duan , Yan Ma , Zhanxin Wang , Linlin Liu , Jian Wang , Lihua Wang , Xiaodong Han","doi":"10.1016/j.scriptamat.2025.116965","DOIUrl":"10.1016/j.scriptamat.2025.116965","url":null,"abstract":"<div><div>Long-period stacking ordered (LPSO) structures can enhance the mechanical properties of magnesium alloys by impeding dislocation motion and hindering deformation twin. In this work, we reported serrated twin boundaries (TBs) induced by LPSO-mediated twin impedance in room-temperature-processed Mg-Gd-Zn alloy and characterized the formation mechanisms at atomic-scale. For the LPSO structures with discontinuous or random spatial distributions in the matrix, TB bypasses the discontinuous LPSO structures, forming the LPSO/TB (basal-prismatic, BP) interfaces. Zn-enriched misfit dislocations formed at the LPSO/TB interface and exerted interfacial pinning on TBs. Reactions of matrix basal dislocations with TBs generate twinning dislocations accompanied by emission of partial basal dislocations and formation of stacking faults (SFs) in twin domains. These SFs also exerted a pinning effect on the BP interface. The synergistic effect of these factors generates serrated <span><math><mrow><mo>{</mo><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>2</mn><mo>}</mo></mrow></math></span> deformation twins and provides new insights into LPSO-twin interaction mechanisms.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"270 ","pages":"Article 116965"},"PeriodicalIF":5.6,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144921987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental determination of critical resolved shear stress for strain-induced phase transformation 应变诱导相变临界分解剪应力的实验测定

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2025-08-30 DOI: 10.1016/j.scriptamat.2025.116966

Roopam Jain , Shikhar Krishn Jha , Ravi Sankar Haridas , Priyanka Agrawal , Jun-Sang Park , Rajiv S. Mishra

{"title":"Experimental determination of critical resolved shear stress for strain-induced phase transformation","authors":"Roopam Jain , Shikhar Krishn Jha , Ravi Sankar Haridas , Priyanka Agrawal , Jun-Sang Park , Rajiv S. Mishra","doi":"10.1016/j.scriptamat.2025.116966","DOIUrl":"10.1016/j.scriptamat.2025.116966","url":null,"abstract":"<div><div>The current investigation reports the first attempt to measure the critical resolved shear stress to initiates strain-induced phase transformation in a three-dimensional polycrystalline aggregate using high-energy diffraction microscopy (HEDM). <em>In situ</em> tensile testing was performed on a Fe<sub>38.5</sub>Mn<sub>20</sub>Co<sub>20</sub>Cr<sub>15</sub>Si<sub>5</sub>Cu<sub>1.5</sub> metastable alloy exhibiting transformation-induced plasticity (TRIP). Grains with a higher propensity for strain-induced phase transformation were tracked using HEDM. A sharp drop in grain specific stress, coinciding with the appearance of a new ε-hcp grain oriented relative to the parent γ-fcc phase, was taken as evidence of grain-specific stress required to trigger phase transformation. The highest resolved shear stress on the potential transformation systems was identified as the critical resolved shear stress (CRSS) for strain-induced phase transformation. For the studied metastable alloy, CRSS for transformation was determined to be 86±3 MPa which was very close to theoretical CRSS value determined using Schmid factor (89±12 MPa) compared to the value determined using Taylor factor (62±7 MPa).</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"270 ","pages":"Article 116966"},"PeriodicalIF":5.6,"publicationDate":"2025-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144916873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Restricted variant selection in martensite transformation of maraging steel during additive manufacturing 增材制造马氏体时效钢马氏体相变的限制性变异选择

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2025-08-29 DOI: 10.1016/j.scriptamat.2025.116961

KenHee Ryou , Jin Young Choi , Rowan Rolark , David C. Dunand , Jian Cao

{"title":"Restricted variant selection in martensite transformation of maraging steel during additive manufacturing","authors":"KenHee Ryou , Jin Young Choi , Rowan Rolark , David C. Dunand , Jian Cao","doi":"10.1016/j.scriptamat.2025.116961","DOIUrl":"10.1016/j.scriptamat.2025.116961","url":null,"abstract":"<div><div>Abnormal martensitic microstructures have been observed in additively manufactured (AMed) maraging steels. We find that AMed martensite exhibits a highly biased selection of variants, predominantly concentrated on a few variants within a single prior austenite grain. Variant selection follows orientation-dependent trends, with restricted variants exhibiting Bain axes closely aligned with specific coordinate directions. Through the thermomechanical finite element analysis, thermal strains during the deposition process are computed, and it is revealed that the tensile residual thermal strain was dominant along a specific orientation. Moreover, the orientation along which the tensile strain was applied is consistent with the Bain axis of the variants that exhibited the restricted selection behavior. We conclude that the direction-dependent distribution of thermal strain during additive manufacturing suppresses the martensitic transformation when the strain is applied in tension. This finding demonstrates potential pathways for intelligent process design, enabling spatial control of microstructure and properties for specific applications.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"270 ","pages":"Article 116961"},"PeriodicalIF":5.6,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144913874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Deformation-assisted precipitation and segregation in Al-Li alloy AA2099 Al-Li合金AA2099的变形辅助析出与偏析

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2025-08-28 DOI: 10.1016/j.scriptamat.2025.116959

Shavi Agrawal, G.S. Avadhani, Satyam Suwas

{"title":"Deformation-assisted precipitation and segregation in Al-Li alloy AA2099","authors":"Shavi Agrawal, G.S. Avadhani, Satyam Suwas","doi":"10.1016/j.scriptamat.2025.116959","DOIUrl":"10.1016/j.scriptamat.2025.116959","url":null,"abstract":"<div><div>In this work, the chemo-mechanical evolution of microstructural features as a function of strain during room temperature severe plastic deformation of an Al-Li alloy has been investigated. Detailed microscopic analysis of the high-pressure torsion (HPT) processed AA2099 alloy reveals several key insights. At lower strain levels of HPT deformation, we observe the segregation of Mg solutes and the formation of Mg-Zn-rich nanoclusters at the grain boundaries to reduce the energy of the non-equilibrium boundaries. The enhanced diffusion of solutes at room temperature is aided by the excess defect density. For the first time, Li-decorated dislocation loops are observed within the matrix, where Li segregation reduces the elastic strain energy of the loops. A few Cu-Zn-rich precipitates nucleate at triple junctions. As strain reaches steady-state, Mg-Zn-rich and Li-rich clusters dissolve, and Mg atoms redistribute from the grain boundaries, while most triple junctions become decorated with Cu-Zn-rich precipitates. These findings provide valuable guidance for the strategic microstructural optimization of Al-Li alloys in advanced applications.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"270 ","pages":"Article 116959"},"PeriodicalIF":5.6,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144908138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced flexoelectricity of barium titanate ceramics by air plasma surface modification 空气等离子体表面改性增强钛酸钡陶瓷挠性电

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2025-08-27 DOI: 10.1016/j.scriptamat.2025.116960

Amei Zhang , Darong Yu , Hongping Hou , Na Liao , Xueguang Zhang , Zhuang Miao , Man Li , Haixia Jing , Shen Bi , Hongliang Du , Longlong Shu

{"title":"Enhanced flexoelectricity of barium titanate ceramics by air plasma surface modification","authors":"Amei Zhang , Darong Yu , Hongping Hou , Na Liao , Xueguang Zhang , Zhuang Miao , Man Li , Haixia Jing , Shen Bi , Hongliang Du , Longlong Shu","doi":"10.1016/j.scriptamat.2025.116960","DOIUrl":"10.1016/j.scriptamat.2025.116960","url":null,"abstract":"<div><div>The electromechanical coupling properties of perovskite-based ceramics, particularly their flexoelectric behavior, hold great potential for applications in sensing and actuation. In this study, we focus on improving the flexoelectric properties of these materials through interface regulation. Where the surface is modified using dielectric barrier discharge technology. The plasma-induced physical and chemical reaction introduces hydroxyl groups on the surface, enhancing the directional polarization ability of the BaTiO<sub>3</sub> crystals and ultimately improving its electrical properties. The results indicate that a 2-mins plasma modification is the most effective in enhancing the flexoelectric properties of BaTiO3. The dielectric constant at high temperatures increases by approximately 23%, and the flexoelectric coefficient at room temperature increases by about 480%. This study introduces a new approach for improving flexoelectric properties and opens up possibilities for more efficient industrial production in the future.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"270 ","pages":"Article 116960"},"PeriodicalIF":5.6,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144907884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dual effects of local chemical order on the ductility of body-centered cubic multi-principal element alloys 局部化学顺序对体心立方多主元素合金塑性的双重影响

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2025-08-27 DOI: 10.1016/j.scriptamat.2025.116964

Qinghui Tang , Fan Zhang , Shipan Yin , Zigao Zhang , Jichen Xu , Yongqi Zhu , Qingjin Zeng , Junping Li , Xingwang Cheng

引用次数: 0

Fracture toughness and crack resistance of laser powder bed fused Al-Mg-Sc-Zr alloy: Effect of precipitate and bimodal grain structure 激光粉末床熔合Al-Mg-Sc-Zr合金的断裂韧性和抗裂性能：析出相和双峰晶粒组织的影响

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2025-08-27 DOI: 10.1016/j.scriptamat.2025.116958

Zhiguang Zhu , Yuntian Ning , Moses J. Paul , Qiang Li , Punit Kumar , Wenhe Liao , Upadrasta Ramamurty

{"title":"Fracture toughness and crack resistance of laser powder bed fused Al-Mg-Sc-Zr alloy: Effect of precipitate and bimodal grain structure","authors":"Zhiguang Zhu , Yuntian Ning , Moses J. Paul , Qiang Li , Punit Kumar , Wenhe Liao , Upadrasta Ramamurty","doi":"10.1016/j.scriptamat.2025.116958","DOIUrl":"10.1016/j.scriptamat.2025.116958","url":null,"abstract":"<div><div>The effect of microstructural evolution induced by heat treatment on the strength, fracture toughness, and crack resistance curve of a laser powder bed fused (LPBF) Al-Mg-Sc-Zr alloy in three conditions (as-built, peak-aged, and over-aged) and along two orthogonal directions was examined. The as-built samples exhibit a bimodal grain structure comprising ultrafine equiaxed grains and coarse columnar grains, displaying isotropic crack initiation toughness (<em>K</em><sub>JIC</sub>) but anisotropic crack growth resistance, due to preferential crack propagation along ultrafine equiaxed grain regions. Peak-aged samples show increased strength due to densely-distributed Al<sub>3</sub>(Sc, Zr) precipitates but reduced toughness and unstable crack growth. In contrast, the over-aged samples exhibit the highest <em>K</em><sub>JIC</sub> values, driven by extensive crack-tip plasticity and larger plastic zone size, leading to pronounced anisotropy. These results emphasize the critical role of microstructure and plastic zone size in governing the fracture behavior of LPBF Al alloys.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"270 ","pages":"Article 116958"},"PeriodicalIF":5.6,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144903520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Defect-solute cooperativity mediated evolution of microstructure and mechanical properties in pre-deformed lean Mg alloys during aging 缺陷溶质协同作用介导预变形贫镁合金时效过程中组织和力学性能的演变

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2025-08-27 DOI: 10.1016/j.scriptamat.2025.116946

Lu Han , Chao Sun , Shen-Bao Jin , Xiang-Yang Yuan , Yong-Kang Li , Sheng-Jie Han , Hui-Yuan Wang

{"title":"Defect-solute cooperativity mediated evolution of microstructure and mechanical properties in pre-deformed lean Mg alloys during aging","authors":"Lu Han , Chao Sun , Shen-Bao Jin , Xiang-Yang Yuan , Yong-Kang Li , Sheng-Jie Han , Hui-Yuan Wang","doi":"10.1016/j.scriptamat.2025.116946","DOIUrl":"10.1016/j.scriptamat.2025.116946","url":null,"abstract":"<div><div>To elucidate the unresolved dynamic evolution of metastable bake-hardening during prolonged isothermal aging, the time-dependent microstructural evolution in 2 % pre-strained Mg-0.6Al-0.7Ce-0.4Ca-0.4Mn alloy under extended aging conditions was systematically investigated. Dislocation networks act as acceleration diffusion pathways facilitating solute redistribution. Furthermore, the co-segregation of Ca and Al atoms induces heterogeneous nucleation of thermodynamically stable nano-(Mg, Al)₂Ca precipitates during prolonged aging. This unique precipitation mechanism effectively compensates for the conventional weakening of dislocation pinning by solutes observed during thermal exposure. Residual matrix solutes progressively form high-density Guinier-Preston (G.P.) zones, which subsequently transform into nano-Al₂Ca precipitates while maintaining spatial distribution density. This work fundamentally uncovers a previously unrecognized age-hardening paradigm mediated by defect-solute cooperativity, providing critical insights for developing cost-effective Mg alloys with enhanced thermal stability.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"270 ","pages":"Article 116946"},"PeriodicalIF":5.6,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144908137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tuning screw-to-edge dislocation slip discrepancy via graph neural network–accelerated exploration of local ordered states in refractory high-entropy alloys 基于图神经网络的螺旋-边缘位错滑移差校正加速了难熔高熵合金的局部有序态探索

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2025-08-27 DOI: 10.1016/j.scriptamat.2025.116962

Yi Yao , Zhengyu Zhang , Jonathan Cappola , Xue Wu , Jiaqi Gong , Feng Yan , Wenjun Cai , Lin Li

{"title":"Tuning screw-to-edge dislocation slip discrepancy via graph neural network–accelerated exploration of local ordered states in refractory high-entropy alloys","authors":"Yi Yao , Zhengyu Zhang , Jonathan Cappola , Xue Wu , Jiaqi Gong , Feng Yan , Wenjun Cai , Lin Li","doi":"10.1016/j.scriptamat.2025.116962","DOIUrl":"10.1016/j.scriptamat.2025.116962","url":null,"abstract":"<div><div>Refractory high-entropy alloys (RHEAs) exhibit unique dislocation behaviors that underpin their exceptional mechanical properties. However, the vast compositional space and complex local atomic environments make it difficult to tailor dislocation slip mechanisms. In this study, we demonstrate that dislocation slip resistance in RHEAs with local ordering can be effectively tuned by jointly adjusting the diffuse-antiphase-boundary energy (DAPBE) and lattice distortion difference (LDD). Using a high-throughput framework enabled by a physics-informed graph neural network, we systematically explored the MoNbTaW compositional space through atomistic simulations with machine-learning potentials. Our findings reveal that increasing DAPBE strengthens resistance to screw dislocation slip, while increasing LDD diminishes this effect but enhances the resistance to edge dislocation slip. Notably, compositions exhibiting both high DAPBE and LDD yield a balanced dislocation response. This study offers a design strategy to improve the strength–ductility synergy in BCC RHEAs by tuning intrinsic material parameters via local ordering.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"270 ","pages":"Article 116962"},"PeriodicalIF":5.6,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144903726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

X-ray irradiation induced strain relaxation of dewetted Ni particles on modified Si substrate x射线辐照诱导脱湿Ni颗粒在改性Si衬底上的应变松弛

IF 5.6 2区材料科学

Scripta Materialia Pub Date : 2025-08-26 DOI: 10.1016/j.scriptamat.2025.116940

David Simonne , Riley Hultquist , Jiangtao Zhao , Andrea Resta , Ericmoore Jossou

引用次数: 0