Scripta Materialia最新文献_第6页

Large superelasticity above 800K in a Ni-Mn-Ga-B-Ce high-temperature shape memory microwire Ni-Mn-Ga-B-Ce高温形状记忆微丝800K以上大超弹性

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-06-19 DOI: 10.1016/j.scriptamat.2025.116827

Zhen Chen , Zhehao Jia , Yin Zhang , Weiran Zhang , Liying Sun , Daoyong Cong

{"title":"Large superelasticity above 800K in a Ni-Mn-Ga-B-Ce high-temperature shape memory microwire","authors":"Zhen Chen , Zhehao Jia , Yin Zhang , Weiran Zhang , Liying Sun , Daoyong Cong","doi":"10.1016/j.scriptamat.2025.116827","DOIUrl":"10.1016/j.scriptamat.2025.116827","url":null,"abstract":"<div><div>With the rapid development of aerospace, automotive, energy exploration, and mechanotronics, higher requirements are put forward for high-temperature shape memory alloys (HTSMAs) as solid-state actuators or superelastic components. Here, we developed a Ni-Mn-Ga-B-Ce HTSMA microwire with an oligocrystalline structure fabricated by Taylor-Ulitovsky method, exhibiting large tensile superelasticity with a recoverable strain up to 9.2 % at 803 K, which is the highest superelastic temperature under tension reported up to now. Owing to the existence of a face-centered cubic (FCC) structured precipitation and a semi-coherent interface between FCC and NM martensite phases, as well as the microstructure of oligocrystalline, the microwire showed excellent superelasticity from 623 K to 803 K. Meanwhile, the microwire also showed excellent cyclic stability during 601 cycles of loading and unloading at 673 K. Combined with easy-fabricated and low cost of raw materials, the microwire shows a high potential in the field of high-temperature actuation and sensing.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"267 ","pages":"Article 116827"},"PeriodicalIF":5.3,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144314588","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

A study of helium bubble facetation in bcc iron through molecular dynamics 用分子动力学研究bcc铁中氦泡的分形

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-06-19 DOI: 10.1016/j.scriptamat.2025.116823

Zhengyang Ming, Ze Chen, Zhaofan Wang, Qi Xiong, Zhe Liu, Chao Yin, Shifeng Mao, Minyou Ye

{"title":"A study of helium bubble facetation in bcc iron through molecular dynamics","authors":"Zhengyang Ming, Ze Chen, Zhaofan Wang, Qi Xiong, Zhe Liu, Chao Yin, Shifeng Mao, Minyou Ye","doi":"10.1016/j.scriptamat.2025.116823","DOIUrl":"10.1016/j.scriptamat.2025.116823","url":null,"abstract":"<div><div>Helium (He) bubble facetation is a widely observed phenomenon in neutron or ion irradiation experiments of iron (Fe) and its alloys. However, the underlying mechanism of bubble facetation remains unclear. In this research, molecular dynamics (MD) simulations are performed to study bubble facetation and the effects of temperature as well as bubble pressure (helium-to-vacancy ratio, He/V ratio) on facetation. The results give the dynamic evolution pictures of He bubble facetation at different temperatures. The process of facetation suggests that a spherical-faceted transition temperature of He bubble exists, which is consistent with experimental observations. Further analysis indicates that facets with higher surface energy emerge as intermediate states during facetation. This mechamism may explain why the bubble facetation predominantly occurs at elevated temperature. Additionally, simulation results related to He/V ratio suggest that increased adatom migration barrier induced by bubble pressure would significantly suppress bubble facetation.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"267 ","pages":"Article 116823"},"PeriodicalIF":5.3,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144314590","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

Hardness anisotropy in Mg: The influence of extension twining and 〈c + a〉 dislocation activity under nanoindentations Mg的硬度各向异性：纳米压痕下扩展缠绕和< c + a >位错活度的影响

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-06-19 DOI: 10.1016/j.scriptamat.2025.116832

Reza Motallebi , Yi-Cheng Lai , Christopher C. Walker, Jiaqi Dong, George M. Pharr, Kelvin Y. Xie

{"title":"Hardness anisotropy in Mg: The influence of extension twining and 〈c + a〉 dislocation activity under nanoindentations","authors":"Reza Motallebi , Yi-Cheng Lai , Christopher C. Walker, Jiaqi Dong, George M. Pharr, Kelvin Y. Xie","doi":"10.1016/j.scriptamat.2025.116832","DOIUrl":"10.1016/j.scriptamat.2025.116832","url":null,"abstract":"<div><div>Nanoindentation was performed on individual grains of a polycrystalline Mg sample with <em>c</em>-axis declination angles ranging from parallel (0°) to perpendicular (90°) to the <em>c</em>-axis. Hardness was highest at ∼0°, decreased up to ∼55°, and then increased at ∼90° to an intermediate level. At ∼0°, high-density 〈<strong><em>c</em></strong> + <strong><em>a</em></strong>〉 dislocations extended deep into the crystal, contributing to high hardness. At ∼55°, 〈<strong><em>c</em></strong> + <strong><em>a</em></strong>〉 dislocations were confined near the indent, and occasional extension twinning reoriented the crystal to ∼45°, promoting 〈<strong><em>a</em></strong>〉 slip in both matrix and twin, leading to low hardness. At ∼90°, extension twinning reoriented the crystal to ∼0°, inducing texture hardening and intermediate hardness. Despite the complex stress state in nanoindentation, which fundamentally differs from the uniaxial stress in bulk tensile and compression tests, the combined contributions of dislocation and twinning still give rise to measurable hardness anisotropy, suggesting nanoindentation as a high-throughput technique for probing orientation-dependent mechanical behavior in Mg.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"267 ","pages":"Article 116832"},"PeriodicalIF":5.3,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144314111","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

Understanding strength-ductility enhancement in an oxygen-doped refractory high-entropy alloy by multi-scale characterization and DFT calculations 通过多尺度表征和DFT计算了解氧掺杂耐火高熵合金的强度-延性增强

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-06-18 DOI: 10.1016/j.scriptamat.2025.116825

Yang Su , Yiwen Chen , Ziliang Lu , Sisheng Wang , Zhijun Wang , Xingyu Gao , Leyun Wang , Xiaoqin Zeng

{"title":"Understanding strength-ductility enhancement in an oxygen-doped refractory high-entropy alloy by multi-scale characterization and DFT calculations","authors":"Yang Su , Yiwen Chen , Ziliang Lu , Sisheng Wang , Zhijun Wang , Xingyu Gao , Leyun Wang , Xiaoqin Zeng","doi":"10.1016/j.scriptamat.2025.116825","DOIUrl":"10.1016/j.scriptamat.2025.116825","url":null,"abstract":"<div><div>The strength-ductility tradeoff in refractory high-entropy alloys (RHEAs) poses a significant challenge for their application in demanding environments. This study investigates the influence of oxygen interstitials on the tensile properties of a novel TiZrV<sub>0.5</sub>Nb<sub>0.5</sub> alloy. The addition of 2 at. % oxygen significantly enhances the yield strength by 164 MPa, attributed to interstitial strengthening. Advanced characterization techniques, including transmission electron microscopy and Laue micro-beam diffraction, reveal that oxygen doping promotes dislocation cross-slip across different slip planes. First-principles calculations further demonstrate that oxygen increases the stacking fault energy (SFE) of the base alloy, facilitating dislocation cross-slip and thereby improving tensile ductility. This work highlights oxygen doping as a promising strategy to simultaneously enhance both strength and ductility in refractory high-entropy alloys.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"267 ","pages":"Article 116825"},"PeriodicalIF":5.3,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144307872","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

Processing-dependent chemical ordering in Cu3Au characterized via non-destructive Bragg coherent diffraction imaging 通过非破坏性布拉格相干衍射成像表征Cu3Au中加工相关的化学有序

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-06-17 DOI: 10.1016/j.scriptamat.2025.116820

Nathaniel Warren , Chloe Skidmore , Katherine J. Harmon , Wonsuk Cha , Jon-Paul Maria , Stephan O. Hruszkewycz , Darren C. Pagan

{"title":"Processing-dependent chemical ordering in Cu3Au characterized via non-destructive Bragg coherent diffraction imaging","authors":"Nathaniel Warren , Chloe Skidmore , Katherine J. Harmon , Wonsuk Cha , Jon-Paul Maria , Stephan O. Hruszkewycz , Darren C. Pagan","doi":"10.1016/j.scriptamat.2025.116820","DOIUrl":"10.1016/j.scriptamat.2025.116820","url":null,"abstract":"<div><div>Of current importance for alloy design is controlling chemical ordering through processing routes to optimize an alloy's mechanical properties for a desired application. However, characterization of chemical ordering remains an ongoing challenge, particularly when nondestructive characterization is needed. In this study, Bragg coherent diffraction imaging is used to reconstruct morphology and lattice displacement in model Cu<sub>3</sub>Au nanocrystals that have undergone different heat treatments to produce variation in chemical ordering. The magnitudes and distributions of the scattering amplitudes (proportional to electron density) and lattice strains within these crystals are then analyzed to correlate them to the expected amount of chemical ordering present. Nanocrystals with increased amounts of ordering are found to generally have less extreme strains present and reduced strain distribution widths. In addition, statistical correlations are found between the spatial arrangement of scattering amplitude and lattice strains.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"267 ","pages":"Article 116820"},"PeriodicalIF":5.3,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144297983","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

Cooperative and competitive interactions on plastic deformation dynamics in gradient grained dual-phase heterostructures 梯度晶状双相异质结构塑性变形动力学的合作与竞争相互作用

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-06-17 DOI: 10.1016/j.scriptamat.2025.116821

Renhao Wu , Fujun Cao , Haiming Zhang , Longfei Xu , Hyojin Park , Shi Woo Lee , Peihao Geng , Xiaomei Feng , Ninshu Ma , Hyoung Seop Kim

{"title":"Cooperative and competitive interactions on plastic deformation dynamics in gradient grained dual-phase heterostructures","authors":"Renhao Wu , Fujun Cao , Haiming Zhang , Longfei Xu , Hyojin Park , Shi Woo Lee , Peihao Geng , Xiaomei Feng , Ninshu Ma , Hyoung Seop Kim","doi":"10.1016/j.scriptamat.2025.116821","DOIUrl":"10.1016/j.scriptamat.2025.116821","url":null,"abstract":"<div><div>Heterostructured metallic materials hold significant potential for overcoming traditional strength-ductility trade-off, primarily due to their unique hetero-deformation-induced strengthening effects. This study investigates the interplay between competitive and cooperative interactions in strengthening and hardening mechanisms of stainless steel with dual heterogeneity in phase and grain size gradient. Micro-digital image correlation and <em>in-situ</em> electron backscatter diffraction were employed to monitor the evolution of microstructures during deformation, including grain size, phase, and recrystallization state. Additionally, nonlocal spectral crystal plasticity simulations were conducted to quantitatively analyze localized stress-strain and geometrically necessary dislocations distribution. The individual heterogeneity of the grain size gradient plays a cooperative role at the early deformation stage but assumes a competitive role during the intermediate deformation stage, in conjunction with the phase heterogeneity. The dual factors collaboratively dominate the hetero-deformation-induced effect of the integrated sample. This study provides valuable insights into the design of advanced dual/multiple heterostructures.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"267 ","pages":"Article 116821"},"PeriodicalIF":5.3,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144297981","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

Abnormal grain growth mechanisms in wrought nickel–based superalloy via semi–in situ EBSD: New perspectives 半原位EBSD形变镍基高温合金异常晶粒生长机制：新视角

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-06-17 DOI: 10.1016/j.scriptamat.2025.116829

Shichang Qiao , Chao Yuan , Zhiwen Hou , Tianyi Wang , Na Li , Xinyu Gao , Xin Wen , Fengzhen Wang , Zhikang Xia , Yongqiang Wang , Jinzhe Jiang , Shuai Liu

引用次数: 0

Superior strength-ductility synergy achieved in WA-DED Mg alloys by modulating precipitates through double-stage aging 通过双阶段时效调制析出物，WA-DED镁合金获得了优异的强度-延性协同效应

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-06-14 DOI: 10.1016/j.scriptamat.2025.116819

Wei Liu , Hai-Long Jia , Min Zha , Artem Marchenkov , Xiao-Feng Xu , Yue Jiang , Yi-Hang Yang , Hui-Yuan Wang

{"title":"Superior strength-ductility synergy achieved in WA-DED Mg alloys by modulating precipitates through double-stage aging","authors":"Wei Liu , Hai-Long Jia , Min Zha , Artem Marchenkov , Xiao-Feng Xu , Yue Jiang , Yi-Hang Yang , Hui-Yuan Wang","doi":"10.1016/j.scriptamat.2025.116819","DOIUrl":"10.1016/j.scriptamat.2025.116819","url":null,"abstract":"<div><div>Wire arc directed energy deposition (WA-DED) offers significant potential for rapid fabrication of large-scale Mg alloy components, yet its use is hindered by limited wire availability and strength-ductility trade-offs. Here, we present a groundbreaking advancement in WA-DED Mg-Zn-Zr alloys. Through a novel double-stage aging strategy, an exceptional strength-ductility synergy has been achieved, with the peak-aged alloy demonstrating a yield strength (YS) of ∼214 MPa, an ultimate tensile strength (UTS) of ∼341.8 MPa and an elongation (EL) of ∼21.8 %. Notably, the UTS rivals that of WA-DED Mg-rare earth alloys, while exhibiting excellent EL. The excellent properties are caused by the formation of finer and denser <span><math><msubsup><mi>β</mi><mn>1</mn><mo>′</mo></msubsup></math></span> precipitates during aging. These coherent precipitates play a dual role: they provide significant strengthening by impeding dislocation motion, while their shearable nature prevents stress concentration and preserves ductility. This study offers a novel pathway for developing WA-DED Mg alloys with high strength and ductility.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"267 ","pages":"Article 116819"},"PeriodicalIF":5.3,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144280994","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

Distinct mechanism governing selective leaching of elements from ferrite and austenite in 600 °C lead-bismuth eutectic 600℃铅铋共晶中铁素体和奥氏体元素选择性浸出的独特机制

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-06-14 DOI: 10.1016/j.scriptamat.2025.116818

Decang Zhang , Xiaoxin Zhang , Xian Zeng , Chenxi Zhu , Fanao Meng , Qingzhi Yan

引用次数: 0

Segregation at defective twin boundaries enables high strength and ductility in a nano-twinned Ni alloy 在缺陷孪晶边界处的偏析使纳米孪晶镍合金具有较高的强度和延展性

IF 5.3 2区材料科学

Scripta Materialia Pub Date : 2025-06-14 DOI: 10.1016/j.scriptamat.2025.116822

Xinlai An , Shengyun Yuan , Bohou Zhang , Jiajia Shen , Jieying Chen , Tian Feng , J.P. Oliveira , Yong Zhang

{"title":"Segregation at defective twin boundaries enables high strength and ductility in a nano-twinned Ni alloy","authors":"Xinlai An , Shengyun Yuan , Bohou Zhang , Jiajia Shen , Jieying Chen , Tian Feng , J.P. Oliveira , Yong Zhang","doi":"10.1016/j.scriptamat.2025.116822","DOIUrl":"10.1016/j.scriptamat.2025.116822","url":null,"abstract":"<div><div>The nano-twin boundary (NTB) is not perfectly flat, but inherently decorated with certain amounts of steps comprising partial dislocations. With the decreasing of twin spacing, material softening may be induced by the premature gliding of partial dislocations along NTBs. In the present work, the nano-twinned Ni alloy with Cr enrichment at the steps on the NTBs was fabricated via rolling and subsequent annealing treatments. It was found that Cr enrichment could stabilize NTBs for enhancing the strength and uniform elongation simultaneously. The enhanced strength could be ascribed to a ∼86 MPa increment on the critical resolved shear stress of dislocations gliding along NTBs, which was determined by a combination of miniature tensile testing and electron backscattered diffraction analyses. Furthermore, with plastic straining, Cr enrichment could act as obstacles for dislocation motion, thereby facilitating dislocations accumulation at the NTs, which is indispensable for improving the material tensile ductility.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"267 ","pages":"Article 116822"},"PeriodicalIF":5.3,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144280995","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