Pub Date : 2026-05-01Epub Date: 2026-02-11DOI: 10.1016/j.scriptamat.2026.117216
Tianyu Zhang , Wenwen Wang , Wenqi Guo , Haigen Zhao , Xiaoxiang Wu , Yuanhang Gao , Fan Wang , Yanling Pei , Shusuo Li , Shengkai Gong
The σ topologically close-packed phase has long been regarded as detrimental to the mechanical performances of Ni-based single crystal superalloys. However, recent studies indicate that (001)σ stacking disordering defects can mitigate the adverse effects. In this work, the atomic configurations of two distinct types of (001)σ stacking disordering defects are systematically elucidated, and the resulting structural misalignments are quantitatively characterized. These findings reveal the intrinsic nature and geometric features of these defects, advancing the understanding of defect-mediated mechanisms in the σ phase. This work provides new insights into the defect engineering of the σ phase for the tailored design of next-generation Ni-based single crystal superalloys.
{"title":"Atomic configurations of (001)σ stacking disordering defects within σ phase in Ni-based single crystal superalloys","authors":"Tianyu Zhang , Wenwen Wang , Wenqi Guo , Haigen Zhao , Xiaoxiang Wu , Yuanhang Gao , Fan Wang , Yanling Pei , Shusuo Li , Shengkai Gong","doi":"10.1016/j.scriptamat.2026.117216","DOIUrl":"10.1016/j.scriptamat.2026.117216","url":null,"abstract":"<div><div>The σ topologically close-packed phase has long been regarded as detrimental to the mechanical performances of Ni-based single crystal superalloys. However, recent studies indicate that (001)<sub>σ</sub> stacking disordering defects can mitigate the adverse effects. In this work, the atomic configurations of two distinct types of (001)<sub>σ</sub> stacking disordering defects are systematically elucidated, and the resulting structural misalignments are quantitatively characterized. These findings reveal the intrinsic nature and geometric features of these defects, advancing the understanding of defect-mediated mechanisms in the σ phase. This work provides new insights into the defect engineering of the σ phase for the tailored design of next-generation Ni-based single crystal superalloys.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"277 ","pages":"Article 117216"},"PeriodicalIF":5.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187274","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}
Pub Date : 2026-05-01Epub Date: 2026-02-12DOI: 10.1016/j.scriptamat.2026.117214
Vikram Chavan , Anantatamukala Amrutha , Debarna Bhattacharjee , K V Mani Krishna , Namit Pai , Samik Nag , Saurabh Kundu , Somnath Basu , Ajay Singh Panwar , David Fullwood , Indradev Samajdar
High-resolution electron backscattered diffraction (HR-EBSD) is used to estimate deviatoric residual strain/stress on a mesoscopic scale. HR-EBSD, however, does not accurately capture local hydrostatic strain. The latter represents dilatation-contraction of crystal lattices, affecting experimental Kikuchi band widths. Plastic deformation typically leads to diffused Kikuchi bands, making accurate measurements of band width nearly impossible. This study proposed a novel technique of machine learning, ML, enhanced HR-EBSD. The proposed method utilized the CycleGAN algorithm of Artificial Neural Networks. ML-enhanced HR-EBSD patterns enabled realistic measurements, with significant lowering of measurement uncertainties, of mesoscopic hydrostatic strain/stress. Accurate measurements of complete, deviatoric plus hydrostatic, mesoscopic elastic strain/stress tensors thus emerged.
{"title":"Measurement of mesoscopic hydrostatic residual strain/stress – An emerging possibility","authors":"Vikram Chavan , Anantatamukala Amrutha , Debarna Bhattacharjee , K V Mani Krishna , Namit Pai , Samik Nag , Saurabh Kundu , Somnath Basu , Ajay Singh Panwar , David Fullwood , Indradev Samajdar","doi":"10.1016/j.scriptamat.2026.117214","DOIUrl":"10.1016/j.scriptamat.2026.117214","url":null,"abstract":"<div><div>High-resolution electron backscattered diffraction (HR-EBSD) is used to estimate deviatoric residual strain/stress on a mesoscopic scale. HR-EBSD, however, does not accurately capture local hydrostatic strain. The latter represents dilatation-contraction of crystal lattices, affecting experimental Kikuchi band widths. Plastic deformation typically leads to diffused Kikuchi bands, making accurate measurements of band width nearly impossible. This study proposed a novel technique of machine learning, ML, enhanced HR-EBSD. The proposed method utilized the CycleGAN algorithm of Artificial Neural Networks. ML-enhanced HR-EBSD patterns enabled realistic measurements, with significant lowering of measurement uncertainties, of mesoscopic hydrostatic strain/stress. Accurate measurements of complete, deviatoric plus hydrostatic, mesoscopic elastic strain/stress tensors thus emerged.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"277 ","pages":"Article 117214"},"PeriodicalIF":5.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187271","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}
Pub Date : 2026-05-01Epub Date: 2026-02-14DOI: 10.1016/j.scriptamat.2026.117221
Poorna Chander Kokkula , Ravi Ranjan , Sumantra Mandal , Shiv Brat Singh
The current work explores the implications of grain boundary engineering (GBE) on grain growth kinetics in high-Mn steel. Grain boundary engineered and as-forged (AF) specimens, containing ∼63% and ∼30% of low-energy 3 boundaries, respectively, were chosen for the grain growth study. Subsequently, isothermal annealing experiments were performed at 1473 K for varying time periods. The electron backscatter diffraction technique was used to characterize grains and grain boundaries in all specimens. The grain size measured using the linear intercept method demonstrates slower grain growth kinetics in GBE specimens as compared to AF specimens. This indicates that replacing a significant proportion of high-energy random high-angle grain boundaries with low-energy 3 boundaries would reduce the driving force for grain growth, thereby decreasing the overall grain growth rate. Furthermore, incorporation of grain boundary character distribution into the grain growth model resulted in a better prediction of its influence on grain growth kinetics.
{"title":"Kinetics of grain growth: the effect of grain boundary engineering in high-Mn austenitic steel","authors":"Poorna Chander Kokkula , Ravi Ranjan , Sumantra Mandal , Shiv Brat Singh","doi":"10.1016/j.scriptamat.2026.117221","DOIUrl":"10.1016/j.scriptamat.2026.117221","url":null,"abstract":"<div><div>The current work explores the implications of grain boundary engineering (GBE) on grain growth kinetics in high-Mn steel. Grain boundary engineered and as-forged (AF) specimens, containing ∼63% and ∼30% of low-energy <span><math><mstyle><mi>Σ</mi></mstyle></math></span>3 boundaries, respectively, were chosen for the grain growth study. Subsequently, isothermal annealing experiments were performed at 1473 K for varying time periods. The electron backscatter diffraction technique was used to characterize grains and grain boundaries in all specimens. The grain size measured using the linear intercept method demonstrates slower grain growth kinetics in GBE specimens as compared to AF specimens. This indicates that replacing a significant proportion of high-energy random high-angle grain boundaries with low-energy <span><math><mstyle><mi>Σ</mi></mstyle></math></span>3 boundaries would reduce the driving force for grain growth, thereby decreasing the overall grain growth rate. Furthermore, incorporation of grain boundary character distribution into the grain growth model resulted in a better prediction of its influence on grain growth kinetics.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"277 ","pages":"Article 117221"},"PeriodicalIF":5.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187277","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}
Pub Date : 2026-05-01Epub Date: 2026-02-13DOI: 10.1016/j.scriptamat.2026.117224
Yueying Lin , Jun Zheng , Ming Zhang , Fang Lin , Zhilu Yang , Junwei Li , Jieyuan Wang , Zixiao Li , Kai Zhang , Dan Sun , Chi Chen , Zhongrong Shen
Heteroatom doping effectively modulates hard carbon anodes, yet research remains focused on conventional elements (N, P, S), leaving silicon largely unexplored. This work innovatively employs a hydrosilylation reaction to construct uniformly distributed Si-C/Si-O-C bonds. During carbonization, silicon species synergistically expand the interlayer spacing and refine the graphitic domain size, enhancing disorder and defect density. This creates more active sites and shortens Na+ diffusion paths, boosting plateau capacity and kinetics. Theoretical calculations further demonstrate that after silicon doping, the system exhibits significantly enhanced adsorption energy toward sodium ions along with a notably reduced diffusion barrier, thereby revealing the atomic-scale mechanism underlying the performance improvement. Consequently, the optimized Si-doped hard carbon achieves a high first-cycle Coulombic efficiency of 89.4 % and a dramatically improved reversible capacity of 200.9 mAh g−1 at 3.2 A g−1, versus 15.8 mAh g−1 for the undoped sample. This study validates silicon's synergistic role and offers new insights for designing high-performance sodium-ion battery anodes.
杂原子掺杂有效地调节了硬碳阳极，但研究仍然集中在传统元素（N， P， S）上，使得硅在很大程度上未被探索。这项工作创新性地采用硅氢化反应来构建均匀分布的Si-C/Si-O-C键。在炭化过程中，硅的种类协同作用扩大了层间距，细化了石墨畴的尺寸，增加了无序和缺陷密度。这创造了更多的活性位点，缩短了Na+扩散路径，提高了平台容量和动力学。理论计算进一步表明，硅掺杂后，体系对钠离子的吸附能显著增强，扩散势垒明显降低，从而揭示了性能改善的原子尺度机制。因此，优化后的si掺杂硬碳获得了89.4%的高第一循环库仑效率，并且在3.2 a g−1时显著提高了200.9 mAh g−1的可逆容量，而未掺杂的样品为15.8 mAh g−1。该研究验证了硅的协同作用，并为设计高性能钠离子电池阳极提供了新的见解。
{"title":"Boosting sodium-ion storage kinetics in hard carbon via synergistic si doping modulation of interlayer spacing and crystallite size","authors":"Yueying Lin , Jun Zheng , Ming Zhang , Fang Lin , Zhilu Yang , Junwei Li , Jieyuan Wang , Zixiao Li , Kai Zhang , Dan Sun , Chi Chen , Zhongrong Shen","doi":"10.1016/j.scriptamat.2026.117224","DOIUrl":"10.1016/j.scriptamat.2026.117224","url":null,"abstract":"<div><div>Heteroatom doping effectively modulates hard carbon anodes, yet research remains focused on conventional elements (N, P, S), leaving silicon largely unexplored. This work innovatively employs a hydrosilylation reaction to construct uniformly distributed Si-C/Si-O-C bonds. During carbonization, silicon species synergistically expand the interlayer spacing and refine the graphitic domain size, enhancing disorder and defect density. This creates more active sites and shortens Na<sup>+</sup> diffusion paths, boosting plateau capacity and kinetics. Theoretical calculations further demonstrate that after silicon doping, the system exhibits significantly enhanced adsorption energy toward sodium ions along with a notably reduced diffusion barrier, thereby revealing the atomic-scale mechanism underlying the performance improvement. Consequently, the optimized Si-doped hard carbon achieves a high first-cycle Coulombic efficiency of 89.4 % and a dramatically improved reversible capacity of 200.9 mAh g<sup>−1</sup> at 3.2 A g<sup>−1</sup>, versus 15.8 mAh g<sup>−1</sup> for the undoped sample. This study validates silicon's synergistic role and offers new insights for designing high-performance sodium-ion battery anodes.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"277 ","pages":"Article 117224"},"PeriodicalIF":5.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187275","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}
This study found that superior yield strength in ultrasonically solidified FeCoNiAl0.3 alloy was achieved by inducing high volume fraction of nanoscale precipitates (NPs) without requiring heat treatment. Once ultrasound was applied during solidification, accompanied by the refinement of γ matrix, the radius and volume fraction of L12-structured NPs gradually increased from 1.86 nm and 15.91% to 8.91 nm and 65.22%. Molecular dynamics simulations showed that ultrasound enhanced Al-Ni cluster density in solidifying alloy through promoting Al-Ni ordered atomic pairs formation and accelerating atom diffusion in liquid phase. These numerous clusters increased NPs nucleation rate and further facilitated Ostwald ripening for NPs growth. Superior yield strength as high as 1105 MPa was achieved for FeCoNiAl0.3 alloy, surpassing nearly all as-cast FCC-based M/HEAs and Ni-based alloys both strengthened by L12 precipitates. These NPs contributed an exceptional 830 MPa precipitation strengthening, exceeding those well-designed M/HEAs prepared through rolling and heat treatment.
{"title":"Achieving superior yield strength for medium-entropy FeCoNiAl0.3 alloy through ultrasonically modulating nanoscale precipitates","authors":"Xu Wang, Jianyuan Wang, Yapeng Zheng, Qiuping Li, Wei Zhai, Bingbo Wei","doi":"10.1016/j.scriptamat.2026.117219","DOIUrl":"10.1016/j.scriptamat.2026.117219","url":null,"abstract":"<div><div>This study found that superior yield strength in ultrasonically solidified FeCoNiAl<sub>0.3</sub> alloy was achieved by inducing high volume fraction of nanoscale precipitates (NPs) without requiring heat treatment. Once ultrasound was applied during solidification, accompanied by the refinement of γ matrix, the radius and volume fraction of L1<sub>2</sub>-structured NPs gradually increased from 1.86 nm and 15.91% to 8.91 nm and 65.22%. Molecular dynamics simulations showed that ultrasound enhanced Al-Ni cluster density in solidifying alloy through promoting Al-Ni ordered atomic pairs formation and accelerating atom diffusion in liquid phase. These numerous clusters increased NPs nucleation rate and further facilitated Ostwald ripening for NPs growth. Superior yield strength as high as 1105 MPa was achieved for FeCoNiAl<sub>0.3</sub> alloy, surpassing nearly all as-cast FCC-based M/HEAs and Ni-based alloys both strengthened by L1<sub>2</sub> precipitates. These NPs contributed an exceptional 830 MPa precipitation strengthening, exceeding those well-designed M/HEAs prepared through rolling and heat treatment.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"277 ","pages":"Article 117219"},"PeriodicalIF":5.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187273","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}
Pub Date : 2026-05-01Epub Date: 2026-02-10DOI: 10.1016/j.scriptamat.2026.117203
Stephen T.W. Kerr , Keyvan Ferasat , Yasaman Ghaffari , Kevin Daub , Suraj Y. Persaud , Laurent Karim Béland
Chromium additions are known to promote the formation of a protective Al oxide, alumina, in Ni-Cr-Al alloys, a phenomenon known as the third-element effect (TEE). Using atomistic simulations, we show that Cr lowers vacancy formation energies while leaving migration barriers largely unchanged. This reduction in formation energy leads to a strong amplification of equilibrium vacancy concentrations: compared to Ni–4Al, the concentration in Ni–15Cr–4Al is 11 times higher at 1000 ∘C and more than 54 times higher at 480 ∘C. When combined with tracer mobilities, this produces effective diffusion coefficients up to an order of magnitude greater in the ternary alloy. In parallel, Cr promotes aluminum enrichment at grain boundaries, raising Al levels to about one and a half times the bulk concentration across the boundaries studied. These metal-phase mechanisms provide a quantitative route by which Cr facilitates rapid Al delivery to oxidation fronts, complementing oxygen-gettering models and helping explain the TEE, at both high and intermediate homologous temperatures.
{"title":"Chromium raises vacancy concentration and promotes grain-boundary Al segregation in Ni–Cr–Al","authors":"Stephen T.W. Kerr , Keyvan Ferasat , Yasaman Ghaffari , Kevin Daub , Suraj Y. Persaud , Laurent Karim Béland","doi":"10.1016/j.scriptamat.2026.117203","DOIUrl":"10.1016/j.scriptamat.2026.117203","url":null,"abstract":"<div><div>Chromium additions are known to promote the formation of a protective Al oxide, alumina, in Ni-Cr-Al alloys, a phenomenon known as the third-element effect (TEE). Using atomistic simulations, we show that Cr lowers vacancy formation energies while leaving migration barriers largely unchanged. This reduction in formation energy leads to a strong amplification of equilibrium vacancy concentrations: compared to Ni–4Al, the concentration in Ni–15Cr–4Al is 11 times higher at 1000 <sup>∘</sup>C and more than 54 times higher at 480 <sup>∘</sup>C. When combined with tracer mobilities, this produces effective diffusion coefficients up to an order of magnitude greater in the ternary alloy. In parallel, Cr promotes aluminum enrichment at grain boundaries, raising Al levels to about one and a half times the bulk concentration across the boundaries studied. These metal-phase mechanisms provide a quantitative route by which Cr facilitates rapid Al delivery to oxidation fronts, complementing oxygen-gettering models and helping explain the TEE, at both high and intermediate homologous temperatures.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"277 ","pages":"Article 117203"},"PeriodicalIF":5.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146147628","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}
Pub Date : 2026-05-01Epub Date: 2026-02-12DOI: 10.1016/j.scriptamat.2026.117217
Zijian Zhang , Lin Yuan , Debin Shan , Gang Fang
Serrated grain boundaries (SGBs) are conventionally viewed as barriers to dislocation motion. However, this study finds that in forged magnesium alloy AZ80A, the SGB segment, as a strain accommodator, generally sustains lower local flow stress than flat grain boundaries. Crystal plasticity finite element simulations, validated by experiments, reveal that the tortuous SGB morphology promotes activation of pyramidal 〈a〉 and 〈c + a〉 slip, thereby enhancing strain accommodation. A strain-accommodation factor, as a weighted measure of non‑basal shear, is defined. Two simple models are established to depict that the strain- accommodation factor increases linearly with grain boundary tortuosity, while the local flow stress decays exponentially with this factor. They quantitatively describe the transition of SGBs from passive dislocation barriers to active strain accommodators. The resulting framework links grain boundary geometry to micromechanical response and provides insights for grain boundary engineering in Mg and other HCP alloys.
锯齿晶界通常被认为是位错运动的障碍。然而，本研究发现，在锻造镁合金AZ80A中，SGB段作为应变调节体，其局部流动应力一般低于平晶界。晶体塑性有限元模拟和实验验证表明，弯曲的SGB形态促进锥体< a >和< c + a >滑移的激活，从而增强应变调节能力。定义了应变调节因子，作为非基底剪切的加权度量。建立了两个简单的模型来描述应变调节因子随晶界弯曲度线性增加，而局部流动应力随该因子呈指数衰减。他们定量地描述了sgb从被动位错屏障到主动应变调节体的转变。由此产生的框架将晶界几何与微力学响应联系起来，并为Mg和其他HCP合金的晶界工程提供了见解。
{"title":"Strain accommodation by serrated grain boundaries in a Mg alloy","authors":"Zijian Zhang , Lin Yuan , Debin Shan , Gang Fang","doi":"10.1016/j.scriptamat.2026.117217","DOIUrl":"10.1016/j.scriptamat.2026.117217","url":null,"abstract":"<div><div>Serrated grain boundaries (SGBs) are conventionally viewed as barriers to dislocation motion. However, this study finds that in forged magnesium alloy AZ80A, the SGB segment, as a strain accommodator, generally sustains lower local flow stress than flat grain boundaries. Crystal plasticity finite element simulations, validated by experiments, reveal that the tortuous SGB morphology promotes activation of pyramidal 〈a〉 and 〈c + a〉 slip, thereby enhancing strain accommodation. A strain-accommodation factor, as a weighted measure of non‑basal shear, is defined. Two simple models are established to depict that the strain- accommodation factor increases linearly with grain boundary tortuosity, while the local flow stress decays exponentially with this factor. They quantitatively describe the transition of SGBs from passive dislocation barriers to active strain accommodators. The resulting framework links grain boundary geometry to micromechanical response and provides insights for grain boundary engineering in Mg and other HCP alloys.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"277 ","pages":"Article 117217"},"PeriodicalIF":5.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187272","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}
The plastic deformation response to laser shock peening (LSP) remains unclear in laser directed energy deposited (LDED) Ti6Al4V alloy, especially involving α variant orientations and boundary structures. This work proposed a novel quasi-in-situ observation method to investigate the plastic deformation behavior. Results showed that basal slip exhibited a high sensitivity to LSP load, and micro shear bands formed along V12 variant. Slip transfer capability was affected by the angle of α/α phase boundaries, and widmanstatten at prior β grain boundary had good deformation coordination. This work revealed the microstructure response to LSP load, providing a theoretical foundation for applying LSP on LDED Ti6Al4V alloy.
{"title":"Quasi-in-situ observation for the plastic deformation response to laser shock peening in LDED Ti6Al4V alloy","authors":"Yongxin Zhang , Wei Guo , Junliang Xue , Guoqiang Gao , Ying Zhu , Ming Xu , Yanqiang Liu , Hongqiang Zhang","doi":"10.1016/j.scriptamat.2026.117204","DOIUrl":"10.1016/j.scriptamat.2026.117204","url":null,"abstract":"<div><div>The plastic deformation response to laser shock peening (LSP) remains unclear in laser directed energy deposited (LDED) Ti6Al4V alloy, especially involving α variant orientations and boundary structures. This work proposed a novel quasi-<em>in-situ</em> observation method to investigate the plastic deformation behavior. Results showed that basal slip exhibited a high sensitivity to LSP load, and micro shear bands formed along V12 variant. Slip transfer capability was affected by the angle of α/α phase boundaries, and widmanstatten at prior β grain boundary had good deformation coordination. This work revealed the microstructure response to LSP load, providing a theoretical foundation for applying LSP on LDED Ti6Al4V alloy.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"277 ","pages":"Article 117204"},"PeriodicalIF":5.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146147625","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}
Pub Date : 2026-05-01Epub Date: 2026-02-14DOI: 10.1016/j.scriptamat.2026.117229
Bo Zhao , Toushiqul Islam , Jiashi Miao , Zixun Li , Xavier Hebol D. Cruze , Siyu Wu , Ruipeng Li , Mingyuan Ge , Xianghui Xiao , Fernando Camino , Alan Luo , Zhongshu Ren , Zhengtao Gan , Shuaihang Pan
Scandium (Sc) is a promising microalloying element that enhances the strength and thermal stability of aluminum (Al) alloys. However, these benefits are not fully realized in aluminum-copper (Al-Cu) systems, and corrosion resistance often declines due to the complex phase evolution and diffusion behavior of Cu and Sc. To clarify this, solute diffusion behavior and Cu-Sc interaction during heat treatment (HT) were investigated using in situ synchrotron-based transmission x-ray microscopy (TXM), wide-angle x-ray scattering (WAXS), and x-ray absorption near-edge structure (XANES) spectroscopy. The results, supported by electron microscopy, reveal strong Cu-Sc bonding that significantly impedes solute diffusion, leading to inhomogeneous solute distribution and non-uniform precipitation. Moreover, the Al-Cu-Sc eutectic phase exhibits high thermal stability, resisting dissolution even near the matrix liquidus. These findings quantitatively elucidate the sluggish diffusion kinetics of Cu and Sc, which can help redesign HT schedules to improve both mechanical properties and corrosion resistance in Sc-microalloyed Al-Cu alloys.
{"title":"Solute diffusion behavior during heat treatment and its impact in Sc-microalloyed Al-Cu system","authors":"Bo Zhao , Toushiqul Islam , Jiashi Miao , Zixun Li , Xavier Hebol D. Cruze , Siyu Wu , Ruipeng Li , Mingyuan Ge , Xianghui Xiao , Fernando Camino , Alan Luo , Zhongshu Ren , Zhengtao Gan , Shuaihang Pan","doi":"10.1016/j.scriptamat.2026.117229","DOIUrl":"10.1016/j.scriptamat.2026.117229","url":null,"abstract":"<div><div>Scandium (Sc) is a promising microalloying element that enhances the strength and thermal stability of aluminum (Al) alloys. However, these benefits are not fully realized in aluminum-copper (Al-Cu) systems, and corrosion resistance often declines due to the complex phase evolution and diffusion behavior of Cu and Sc. To clarify this, solute diffusion behavior and Cu-Sc interaction during heat treatment (HT) were investigated using <em>in situ</em> synchrotron-based transmission x-ray microscopy (TXM), wide-angle x-ray scattering (WAXS), and x-ray absorption near-edge structure (XANES) spectroscopy. The results, supported by electron microscopy, reveal strong Cu-Sc bonding that significantly impedes solute diffusion, leading to inhomogeneous solute distribution and non-uniform precipitation. Moreover, the Al-Cu-Sc eutectic phase exhibits high thermal stability, resisting dissolution even near the matrix liquidus. These findings quantitatively elucidate the sluggish diffusion kinetics of Cu and Sc, which can help redesign HT schedules to improve both mechanical properties and corrosion resistance in Sc-microalloyed Al-Cu alloys.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"277 ","pages":"Article 117229"},"PeriodicalIF":5.6,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187276","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}
Pub Date : 2026-04-15Epub Date: 2026-02-03DOI: 10.1016/j.scriptamat.2026.117202
Thanh Tam Nguyen , Xavier Sauvage , Kaveh Edalati
Cadmium sulfide (CdS), particularly with a hexagonal phase, is a favorable semiconductor for photocatalytic hydrogen generation; however, its efficiency is limited without co-catalyst addition due to substantial charge recombination. Here, high-pressure torsion (HPT) is used on CdS with the hexagonal phase to generate a transition to the cubic phase with 26 wt% fraction. Treatment with HPT creates abundant sulfur vacancies and interphase boundaries. These vacancy-rich boundaries act as heterojunctions to promote charge separation, leading to a 16-fold enhancement in water-to-hydrogen splitting without co-catalyst addition. These results suggest the potential of HPT as an effective dopant-free route to achieve highly active sulfide photocatalysts.
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