Scripta Materialia最新文献

英文中文

Delafossite-type CuGaO2 particulate photocathode synthesized via molten salt method for efficient and stable solar water splitting

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia

Pub Date : 2025-02-16 DOI: 10.1016/j.scriptamat.2025.116602

H. Zhang , Y. Wang , Q.T. Liu , J. Gao , J.M. Li , Q.L. Liu , Z.-Y. Zhao , Y.B. Kuang

With the growing demand for renewable energy, photoelectrochemical (PEC) water splitting has emerged as a promising method for hydrogen production. CuGaO₂ is a highly attractive photocathode material due to its positive onset potential, high photovoltage, and ability to absorb visible light via valence band engineering. However, most CuGaO₂ materials suffer from poor crystallinity and oxygen vacancies, which hinder PEC performance. In this study, we synthesized micron-sized prism-shaped CuGaO₂ (MP-CGO) using a novel molten salt method. The MP-CGO photocathode achieved a photocurrent density of 1.2 mA cm⁻² with stability over 6 h, surpassing the performance of materials prepared by hydrothermal methods. This improvement is attributed to enhanced crystallinity and the elimination of defects, which increase carrier concentration, accelerate charge transport, and improve onset potential. Furthermore, MP-CGO, when loaded with Pt cocatalysts, efficiently facilitated hydrogen production. These findings lay a strong foundation for the development of CuGaO₂-based and ternary oxide photocathodes.

{"title":"Delafossite-type CuGaO2 particulate photocathode synthesized via molten salt method for efficient and stable solar water splitting","authors":"H. Zhang , Y. Wang , Q.T. Liu , J. Gao , J.M. Li , Q.L. Liu , Z.-Y. Zhao , Y.B. Kuang","doi":"10.1016/j.scriptamat.2025.116602","DOIUrl":"10.1016/j.scriptamat.2025.116602","url":null,"abstract":"<div><div>With the growing demand for renewable energy, photoelectrochemical (PEC) water splitting has emerged as a promising method for hydrogen production. CuGaO<sub>2</sub> is a highly attractive photocathode material due to its positive onset potential, high photovoltage, and ability to absorb visible light via valence band engineering. However, most CuGaO<sub>2</sub> materials suffer from poor crystallinity and oxygen vacancies, which hinder PEC performance. In this study, we synthesized micron-sized prism-shaped CuGaO<sub>2</sub> (MP-CGO) using a novel molten salt method. The MP-CGO photocathode achieved a photocurrent density of 1.2 mA cm<sup>−2</sup> with stability over 6 h, surpassing the performance of materials prepared by hydrothermal methods. This improvement is attributed to enhanced crystallinity and the elimination of defects, which increase carrier concentration, accelerate charge transport, and improve onset potential. Furthermore, MP-CGO, when loaded with Pt cocatalysts, efficiently facilitated hydrogen production. These findings lay a strong foundation for the development of CuGaO<sub>2</sub>-based and ternary oxide photocathodes.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"261 ","pages":"Article 116602"},"PeriodicalIF":5.3,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422346","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

In situ transmission Kikuchi diffraction tensile testing

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia

Pub Date : 2025-02-15 DOI: 10.1016/j.scriptamat.2025.116608

Tijmen Vermeij , Amit Sharma , Douglas Steinbach , Jun Lou , Johann Michler , Xavier Maeder

We present a methodology for in situ Transmission Kikuchi Diffraction (TKD) tensile testing that enables nanoscale characterization of the evolution of complex plasticity mechanisms. By integrating a modified in situ scanning electron microscope nanoindenter with a microscale push-to-pull device and a conventional Electron Backscatter Diffraction (EBSD) detector, we achieved TKD measurements at high spatial resolution during mechanical deformation. A dedicated focused ion beam procedure was developed for site-specific specimen fabrication, including lift-out, thinning, and shaping into a dog-bone geometry. The methodology was demonstrated on two case studies: (i) a metastable β-Ti single crystal, on which we quantified the initiation and evolution of nanoscale twinning and stress-induced martensitic transformation, and (ii) a CuAl/Al₂O₃ nanolaminate, which showed nanoscale plasticity and twinning/detwinning in a complex microstructure. Overall, this approach provides a robust alternative to in situ EBSD and transmission electron microscopy testing, facilitating detailed analysis of deformation mechanisms at the nanoscale.

{"title":"In situ transmission Kikuchi diffraction tensile testing","authors":"Tijmen Vermeij , Amit Sharma , Douglas Steinbach , Jun Lou , Johann Michler , Xavier Maeder","doi":"10.1016/j.scriptamat.2025.116608","DOIUrl":"10.1016/j.scriptamat.2025.116608","url":null,"abstract":"<div><div>We present a methodology for <em>in situ</em> Transmission Kikuchi Diffraction (TKD) tensile testing that enables nanoscale characterization of the evolution of complex plasticity mechanisms. By integrating a modified <em>in situ</em> scanning electron microscope nanoindenter with a microscale push-to-pull device and a conventional Electron Backscatter Diffraction (EBSD) detector, we achieved TKD measurements at high spatial resolution during mechanical deformation. A dedicated focused ion beam procedure was developed for site-specific specimen fabrication, including lift-out, thinning, and shaping into a dog-bone geometry. The methodology was demonstrated on two case studies: (i) a metastable β-Ti single crystal, on which we quantified the initiation and evolution of nanoscale twinning and stress-induced martensitic transformation, and (ii) a CuAl/Al₂O₃ nanolaminate, which showed nanoscale plasticity and twinning/detwinning in a complex microstructure. Overall, this approach provides a robust alternative to <em>in situ</em> EBSD and transmission electron microscopy testing, facilitating detailed analysis of deformation mechanisms at the nanoscale.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"261 ","pages":"Article 116608"},"PeriodicalIF":5.3,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Manipulating the fine grain nucleation in Sc/Zr-modified Al alloys through a novel process strategy of laser powder bed fusion

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia

Pub Date : 2025-02-15 DOI: 10.1016/j.scriptamat.2025.116606

Zhenyu Chen , Chengqi Lu , Yuang Cheng , Xing Zhu , Tongzheng Wei , Chuanyang Wang , Qingbo Jia

Fine equiaxed grain structure demonstrated promising opportunities for reducing the solidification cracking and mechanical property anisotropy issues of Sc/Zr-modified Al alloys fabricated by laser powder bed fusion (LPBF), provided by sufficient Al₃(Sc,Zr) primary particles existed in the melt pool. Herein, we report a novel LPBF processing strategy to manipulate the fine equiaxed grain nucleation in Al alloys with a reduced addition of Sc/Zr elements. By periodically alternating the input laser process parameters between layers, we found that the nucleation of Al₃(Sc,Zr) primary particles can be significantly promoted along the melt pool boundaries. The proposed process strategy was further verified in a hot tearing susceptible Al-Cu-Sc alloy, which successfully improved its LPBF processability and mechanical property isotropy. The present study provides valuable insights for future microstructure and mechanical property optimizations of high strength alloys fabricated via LPBF.

{"title":"Manipulating the fine grain nucleation in Sc/Zr-modified Al alloys through a novel process strategy of laser powder bed fusion","authors":"Zhenyu Chen , Chengqi Lu , Yuang Cheng , Xing Zhu , Tongzheng Wei , Chuanyang Wang , Qingbo Jia","doi":"10.1016/j.scriptamat.2025.116606","DOIUrl":"10.1016/j.scriptamat.2025.116606","url":null,"abstract":"<div><div>Fine equiaxed grain structure demonstrated promising opportunities for reducing the solidification cracking and mechanical property anisotropy issues of Sc/Zr-modified Al alloys fabricated by laser powder bed fusion (LPBF), provided by sufficient Al<sub>3</sub>(Sc,Zr) primary particles existed in the melt pool. Herein, we report a novel LPBF processing strategy to manipulate the fine equiaxed grain nucleation in Al alloys with a reduced addition of Sc/Zr elements. By periodically alternating the input laser process parameters between layers, we found that the nucleation of Al<sub>3</sub>(Sc,Zr) primary particles can be significantly promoted along the melt pool boundaries. The proposed process strategy was further verified in a hot tearing susceptible Al-Cu-Sc alloy, which successfully improved its LPBF processability and mechanical property isotropy. The present study provides valuable insights for future microstructure and mechanical property optimizations of high strength alloys fabricated via LPBF.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"261 ","pages":"Article 116606"},"PeriodicalIF":5.3,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422344","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

Reactive flash sintering: Assessing the role of volume change during phase reaction

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia

Pub Date : 2025-02-14 DOI: 10.1016/j.scriptamat.2025.116601

Vikaskumar Mishra, Praful Pandey, Pranav Rai, Tamoghna Chakrabarti, Devinder Yadav

Reactive flash sintering (RFS) has recently emerged as a novel technique for simultaneous synthesis and densification of ceramics where phase reaction and sintering occur in a few seconds. Typically, any phase reaction is accompanied by a volume change. This work is an initial attempt to understand the influence of phase-reaction-driven volume change on densification during RFS. We carried out RFS on two systems; one showing large volume contraction (

B a O + T i O_{2} \to B a T i O_{3}

) and other showing large volume expansion (

A l_{2} O_{3} + T i O_{2} \to A l_{2} T i O_{5}

), during phase reaction. The progress of phase reaction and corresponding densification was quantitatively monitored through XRD, real-time video and density measurement of interrupted experiments. In the volume expansion system, the phase reaction contributed positively to densification. In the volume contraction system, phase reaction de-sintered the sample by generating additional pores. We show that volume change associated with phase reaction significantly influences the extent of sintering during the RFS process.

{"title":"Reactive flash sintering: Assessing the role of volume change during phase reaction","authors":"Vikaskumar Mishra, Praful Pandey, Pranav Rai, Tamoghna Chakrabarti, Devinder Yadav","doi":"10.1016/j.scriptamat.2025.116601","DOIUrl":"10.1016/j.scriptamat.2025.116601","url":null,"abstract":"<div><div>Reactive flash sintering (RFS) has recently emerged as a novel technique for simultaneous synthesis and densification of ceramics where phase reaction and sintering occur in a few seconds. Typically, any phase reaction is accompanied by a volume change. This work is an initial attempt to understand the influence of phase-reaction-driven volume change on densification during RFS. We carried out RFS on two systems; one showing large volume contraction (<span><math><mrow><mi>B</mi><mi>a</mi><mi>O</mi><mo>+</mo><mi>T</mi><mi>i</mi><msub><mi>O</mi><mn>2</mn></msub><mo>→</mo><mi>B</mi><mi>a</mi><mi>T</mi><mi>i</mi><msub><mi>O</mi><mn>3</mn></msub></mrow></math></span>) and other showing large volume expansion (<span><math><mrow><mi>A</mi><msub><mi>l</mi><mn>2</mn></msub><msub><mi>O</mi><mn>3</mn></msub><mo>+</mo><mi>T</mi><mi>i</mi><msub><mi>O</mi><mn>2</mn></msub><mo>→</mo><mi>A</mi><msub><mi>l</mi><mn>2</mn></msub><mi>T</mi><mi>i</mi><msub><mi>O</mi><mn>5</mn></msub></mrow></math></span>), during phase reaction. The progress of phase reaction and corresponding densification was quantitatively monitored through XRD, real-time video and density measurement of interrupted experiments. In the volume expansion system, the phase reaction contributed positively to densification. In the volume contraction system, phase reaction de-sintered the sample by generating additional pores. We show that volume change associated with phase reaction significantly influences the extent of sintering during the RFS process.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"260 ","pages":"Article 116601"},"PeriodicalIF":5.3,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403027","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

Room-temperature vacancy emission from jog on edge dislocation in FCC nickel under glide force

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia

Pub Date : 2025-02-12 DOI: 10.1016/j.scriptamat.2025.116597

Yifan Wang , Wu-Rong Jian , Wei Cai

Jogs, atomic-scale steps on dislocations, play an important role in crystal plasticity, yet they are often ignored in discrete dislocation dynamics (DDD) simulations due to their small sizes. While jogs on screw dislocations are known to move non-conservatively (i.e. climb) accompanied by vacancy emission, jogs on edge dislocations are commonly expected to move conservatively (i.e. glide) under ambient conditions. Here we report unexpected findings from molecular dynamics simulations of an edge dislocation containing a pair of unit jogs in face-centered cubic nickel at 300K. We observe that one of the jogs climbs and emits vacancies intermittently at higher stresses, unexpected at such a low temperature, as climb is typically associated with creep at roughly half of the melting temperature. Our results highlight the significance of the complex interplay between point defects (i.e., vacancies) and dislocations in room-temperature plasticity, suggesting that these interactions may be more significant than previously thought.

引用次数: 0

Improved magnetostriction of Tb-doped Ni45Co10Mn20Ga25 ferromagnetic strain glass

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia

Pub Date : 2025-02-11 DOI: 10.1016/j.scriptamat.2025.116604

Dong Duan , Chunxi Hao , Jiangang Jiang , Ying Li

Highly sensitive magnetostrictive materials with low-field-triggered large magnetostriction are crucial for miniaturized actuator and sensor applications but have rarely been achieved. Accumulated experimental results indicate that ferromagnetic strain glass with nano-sized domains can lead to a low magnetic field required to achieve saturation magnetostriction but cannot guarantee large magnetostriction. Therefore, finding effective ways to enhance their magnetostriction is essential for achieving highly sensitive magnetostrictive effects. In this work, we investigated the impact of Tb-doping on the transformation behavior and magnetostrictive property of Ni₄₅Co₁₀Mn₂₀Ga₂₅ ferromagnetic strain glass bulk samples. We found that the martensitic transformation start temperature gradually increases with rising Tb doping levels. The comparative results reveal that trace amounts of Tb-doping significantly enhance the magnetostriction of Ni₄₅Co₁₀Mn₂₀Ga₂₅. Further investigation revealed that trace Tb-doping leads to a relatively high volume fraction of nano-domains at room temperature, resulting in a larger magnetostriction.

{"title":"Improved magnetostriction of Tb-doped Ni45Co10Mn20Ga25 ferromagnetic strain glass","authors":"Dong Duan , Chunxi Hao , Jiangang Jiang , Ying Li","doi":"10.1016/j.scriptamat.2025.116604","DOIUrl":"10.1016/j.scriptamat.2025.116604","url":null,"abstract":"<div><div>Highly sensitive magnetostrictive materials with low-field-triggered large magnetostriction are crucial for miniaturized actuator and sensor applications but have rarely been achieved. Accumulated experimental results indicate that ferromagnetic strain glass with nano-sized domains can lead to a low magnetic field required to achieve saturation magnetostriction but cannot guarantee large magnetostriction. Therefore, finding effective ways to enhance their magnetostriction is essential for achieving highly sensitive magnetostrictive effects. In this work, we investigated the impact of Tb-doping on the transformation behavior and magnetostrictive property of Ni<sub>45</sub>Co<sub>10</sub>Mn<sub>20</sub>Ga<sub>25</sub> ferromagnetic strain glass bulk samples. We found that the martensitic transformation start temperature gradually increases with rising Tb doping levels. The comparative results reveal that trace amounts of Tb-doping significantly enhance the magnetostriction of Ni<sub>45</sub>Co<sub>10</sub>Mn<sub>20</sub>Ga<sub>25</sub>. Further investigation revealed that trace Tb-doping leads to a relatively high volume fraction of nano-domains at room temperature, resulting in a larger magnetostriction.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"260 ","pages":"Article 116604"},"PeriodicalIF":5.3,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387460","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

Architected superalloys: A pathway to lightweight high temperature materials

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia

Pub Date : 2025-02-10 DOI: 10.1016/j.scriptamat.2025.116598

Yuanbo T. Tang , Yunlan Zhang , Li Wan , Nicole Kuek , Enrique Alabort , Roger C. Reed

Materials for high temperature applications – for example rocket engines – are often metallic and therefore tend to suffer from high density when used in their monolithic form. The root cause of this dilemma is the solid-state physics causing the low rates of thermally-activated processes such as diffusion and creep, it also confers the very high density. Using the nickel-based superalloys as an exemplar, we demonstrate here that this dilemma in high temperature materials can be defeated by designing open cellular structures – leveraging recent progress in new alloys designed specifically for additive manufacturing. The resulting low-density architected materials exhibit optimal stretch-dominant or bend-dominant behaviour at high temperatures, as exemplified by regular honeycomb structures which are built. Thus, as well-behaved materials these findings open up new design possibilities for high-temperature applications where low density is particularly needed.

引用次数: 0

Impacts of substrate and growth temperature on the deposition and etching of c-axis oriented AlN piezoelectric thin films

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia

Pub Date : 2025-02-09 DOI: 10.1016/j.scriptamat.2025.116592

Shaocheng Wu , Wenjiao Pei , Rongbin Xu , Yibo Zeng , Jianfang Xu , Baoping Zhang , Daquan Yu

We studied the impacts of deposition substrate and temperature on the growth and wet etching behavior of AlN piezoelectric thin films. Using Mo substrate as well as optimizing temperature (450 °C), AlN films with high crystalline quality (FWHM =0.9°) and excellent piezoelectric property (d₃₃=6.3pm/V) were achieved by magnetron sputtering. Experiment results suggest that, the substrate predominantly determines the grain size and the formation of columnar structure during the initial growth stage, while the temperature mainly affects the final grain morphology. The better crystalline quality of AlN, the higher its piezoelectricity. Besides, by using TMAH solution for the wet etching of AlN films with different growth condition, it was found that the columnar grain structure is related to the chemical stability of the {10–1–2} planes, which influences the etching morphology. The etching rate shows a trend from fast to slow, and the initial rate is positively correlated with the grain size.

{"title":"Impacts of substrate and growth temperature on the deposition and etching of c-axis oriented AlN piezoelectric thin films","authors":"Shaocheng Wu , Wenjiao Pei , Rongbin Xu , Yibo Zeng , Jianfang Xu , Baoping Zhang , Daquan Yu","doi":"10.1016/j.scriptamat.2025.116592","DOIUrl":"10.1016/j.scriptamat.2025.116592","url":null,"abstract":"<div><div>We studied the impacts of deposition substrate and temperature on the growth and wet etching behavior of AlN piezoelectric thin films. Using Mo substrate as well as optimizing temperature (450 °C), AlN films with high crystalline quality (FWHM =0.9°) and excellent piezoelectric property (d<sub>33</sub>=6.3pm/V) were achieved by magnetron sputtering. Experiment results suggest that, the substrate predominantly determines the grain size and the formation of columnar structure during the initial growth stage, while the temperature mainly affects the final grain morphology. The better crystalline quality of AlN, the higher its piezoelectricity. Besides, by using TMAH solution for the wet etching of AlN films with different growth condition, it was found that the columnar grain structure is related to the chemical stability of the {10–1–2} planes, which influences the etching morphology. The etching rate shows a trend from fast to slow, and the initial rate is positively correlated with the grain size.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"260 ","pages":"Article 116592"},"PeriodicalIF":5.3,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372079","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

On the efficacy of Xe+-pFIB preparation to avoid Ga+-FIB induced phase transformations in Al-Ni alloys

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia

Pub Date : 2025-02-09 DOI: 10.1016/j.scriptamat.2025.116589

Hendrik C. Jansen , Amit Sharma , Krzysztof Wieczerzak , Ganesh K. Nayak , Jochen M. Schneider , Jakob Schwiedrzik , Thomas E.J. Edwards , Johann Michler

Preparation of an Al-Ni alloy for transmission electron microscopy (TEM) by focused ion beam (FIB) milling using Ga⁺ ions induced phase transformations, risking misinterpretation: from FCC Al-Ni solid solution to FCC Al-Ni and orthorhombic Al₃Ni phases. Upon milling a nanolaminated Al₉₅Ni₅ - AlO_x thin film with Ga⁺ ions, local Ga segregations of up to 15 at.% and the concurrent formation of orthorhombic regions are observed. This is consistent with density functional theory calculations indicating that the orthorhombic structures with and without Ga are more stable than the corresponding FCC compositions probed here. In contrast, Xe⁺ plasma FIB preparation did not alter the microstructure and the maximum Xe-content reached only 0.2 at.%. TEM-analysis did not reveal significant strain differences of the Al-Ni solid solution and Al₃Ni. Hence, we recommend the use of Xe⁺-pFIB for sample preparation of alloys which are sensitive to Ga-induced phase transformations such as Al₉₅Ni₅ to prevent misinterpretation.

{"title":"On the efficacy of Xe+-pFIB preparation to avoid Ga+-FIB induced phase transformations in Al-Ni alloys","authors":"Hendrik C. Jansen , Amit Sharma , Krzysztof Wieczerzak , Ganesh K. Nayak , Jochen M. Schneider , Jakob Schwiedrzik , Thomas E.J. Edwards , Johann Michler","doi":"10.1016/j.scriptamat.2025.116589","DOIUrl":"10.1016/j.scriptamat.2025.116589","url":null,"abstract":"<div><div>Preparation of an Al-Ni alloy for transmission electron microscopy (TEM) by focused ion beam (FIB) milling using Ga<sup>+</sup> ions induced phase transformations, risking misinterpretation: from FCC Al-Ni solid solution to FCC Al-Ni and orthorhombic Al<sub>3</sub>Ni phases. Upon milling a nanolaminated Al<sub>95</sub>Ni<sub>5</sub> - AlO<sub>x</sub> thin film with Ga<sup>+</sup> ions, local Ga segregations of up to 15 at.% and the concurrent formation of orthorhombic regions are observed. This is consistent with density functional theory calculations indicating that the orthorhombic structures with and without Ga are more stable than the corresponding FCC compositions probed here. In contrast, Xe<sup>+</sup> plasma FIB preparation did not alter the microstructure and the maximum Xe-content reached only 0.2 at.%. TEM-analysis did not reveal significant strain differences of the Al-Ni solid solution and Al<sub>3</sub>Ni. Hence, we recommend the use of Xe<sup>+</sup>-pFIB for sample preparation of alloys which are sensitive to Ga-induced phase transformations such as Al<sub>95</sub>Ni<sub>5</sub> to prevent misinterpretation.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"260 ","pages":"Article 116589"},"PeriodicalIF":5.3,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact of high-pressure hydrogen charging on mechanical behavior and lattice parameters of a polycrystalline CoNiCr-based superalloy

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia

Pub Date : 2025-02-08 DOI: 10.1016/j.scriptamat.2025.116594

O. Nagel , M. Fritton , A. Mutschke , M. Spörlein , A. Stark , D. Sheptyakov , C. Höschen , P. Felfer , R. Gilles , S. Neumeier

Due to the increasing significance of hydrogen in future applications, it is crucial to address the potential effects of hydrogen on material safety in hydrogen-rich environments. Detecting hydrogen remains challenging. In this study, we provide an explanation for hydrogen embrittlement in a CoNiCr-based superalloy using a combination of NanoSIMS measurements, synchrotron and neutron diffraction, and analysis of fractured tensile samples from hydrogen-charged specimens. NanoSIMS mappings and diffraction experiments revealed the highest hydrogen concentration inside precipitates of the µ phase. Neutron diffraction experiments indicate that the γ′ phase slightly incorporates more hydrogen than the γ phase, therefore expands comparatively more and thus, the positive γ/γ′-lattice misfit increases a little. This results in a strong influence of hydrogen on the mechanical properties of hydrogen as revealed by tensile tests. Hydrogen inside µ phase particles and at γ/γ′-interfaces leads to pronounced crack initiation at γ/µ-interfaces and facilitates crack propagation along weakened γ/γ′-interfaces.

{"title":"Impact of high-pressure hydrogen charging on mechanical behavior and lattice parameters of a polycrystalline CoNiCr-based superalloy","authors":"O. Nagel , M. Fritton , A. Mutschke , M. Spörlein , A. Stark , D. Sheptyakov , C. Höschen , P. Felfer , R. Gilles , S. Neumeier","doi":"10.1016/j.scriptamat.2025.116594","DOIUrl":"10.1016/j.scriptamat.2025.116594","url":null,"abstract":"<div><div>Due to the increasing significance of hydrogen in future applications, it is crucial to address the potential effects of hydrogen on material safety in hydrogen-rich environments. Detecting hydrogen remains challenging. In this study, we provide an explanation for hydrogen embrittlement in a CoNiCr-based superalloy using a combination of NanoSIMS measurements, synchrotron and neutron diffraction, and analysis of fractured tensile samples from hydrogen-charged specimens. NanoSIMS mappings and diffraction experiments revealed the highest hydrogen concentration inside precipitates of the µ phase. Neutron diffraction experiments indicate that the γ′ phase slightly incorporates more hydrogen than the γ phase, therefore expands comparatively more and thus, the positive γ/γ′-lattice misfit increases a little. This results in a strong influence of hydrogen on the mechanical properties of hydrogen as revealed by tensile tests. Hydrogen inside µ phase particles and at γ/γ′-interfaces leads to pronounced crack initiation at γ/µ-interfaces and facilitates crack propagation along weakened γ/γ′-interfaces.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"260 ","pages":"Article 116594"},"PeriodicalIF":5.3,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143351290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

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全部 ACS Publications Elsevier ieeexplore Springer The Royal Society of Chemistry Wiley

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全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.

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