Scripta Materialia最新文献

英文中文

Mechanisms underlying TRIP effect on ductility enhancement in titanium alloys TRIP对钛合金塑性增强的作用机制

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia

Pub Date : 2025-11-19 DOI: 10.1016/j.scriptamat.2025.117104

Xiaofu Zhang , Shu Wang , Ruirun Chen , Weipeng Xu , Shichen Sun , Yili Li , Hongwei Wang

The transformation-induced plasticity (TRIP) effect has been widely introduced into advanced metal structural materials to assist dislocation slip in carrying plastic deformation. In this work, the deformation responses of stress-induced α′′-martensite (SIM) under different yield strengths and early plastic behaviors were investigated for TRIP titanium alloys. Accordingly, the comprehensive theoretical calculations focusing on phase stability and modulus mismatch were employed for screening TRIP-dominated target composition. The designed Ti-0.56Al-8.04Mo-2.18Cr (wt.%) alloy achieved a synergistic enhancement of yield strength-ductility after simple thermomechanical processing. Our results clarified the conventional understanding for deformation behaviors of SIM at the early plastic stage. Concurrently, the mechanism underlying the retention of > 0.52 ductility at approaching 700 MPa yield strength for TRIP-dominated titanium alloys has been systematically elucidated. Moreover, three SIM-SIM interaction modes, that is, shear displacement, SIM splitting, and SIM blocking, and detwinning phenomena in α′′-martensite during unloading were also captured.

相变诱发塑性（TRIP）效应被广泛引入到先进的金属结构材料中，以辅助位错滑移进行塑性变形。本文研究了TRIP钛合金在不同屈服强度下应力诱导α”-马氏体（SIM）的变形响应和早期塑性行为。因此，采用以相稳定性和模量失配为重点的综合理论计算来筛选trip主导的靶成分。设计的Ti-0.56Al-8.04Mo-2.18Cr （wt.%）合金经过简单的热处理后，获得了屈服强度和塑性的协同增强。我们的结果澄清了传统的理解在塑性早期的SIM变形行为。同时，系统地阐明了以trip为主的钛合金在接近700mpa屈服强度时保持>； 0.52延展性的机制。此外，在卸载过程中还捕捉到了剪切位移、SIM分裂和SIM阻塞三种SIM-SIM相互作用模式，以及α”-马氏体的脱孪生现象。

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引用次数: 0

Thermoelectric properties of semiconducting approximant crystals in the Al–Ge–Ru system Al-Ge-Ru体系中半导体近似晶体的热电性质

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia

Pub Date : 2025-11-17 DOI: 10.1016/j.scriptamat.2025.117100

Yutaka Iwasaki , Yasuhiro Niwa , Koichi Kitahara , Kaoru Kimura , Ryuji Tamura

Semiconducting quasicrystals and their approximant crystals (ACs) have attracted significant attention because of their potential applications as thermoelectric materials. Herein, we report the synthesis of a semiconducting AC in the Al–Ge–Ru system and its thermoelectric properties. The Al–Ge–Ru AC exhibited a band gap of approximately 0.25 eV. Notably, we observed a negative Seebeck coefficient, which reached a maximum magnitude of 200 µV K⁻¹, marking the first example of an n-type semiconducting AC. The Al₇₄Ge₄Ru₂₂ AC exhibiting degenerate semiconductor behavior reached a dimensionless figure of merit of 0.28 at a peak temperature of 473 K. This represents the highest figure of merit achieved to date for a quasicrystalline-based thermoelectric material.

半导体准晶体及其近似晶体因其作为热电材料的潜在应用而备受关注。本文报道了Al-Ge-Ru体系中半导体交流材料的合成及其热电性能。Al-Ge-Ru交流电的带隙约为0.25 eV。值得注意的是，我们观察到负塞贝克系数，其最大值达到200µV K−1，标志着n型半导体交流的第一个例子。具有简并半导体行为的Al74Ge4Ru22交流在峰值温度为473 K时达到了0.28的无因次优值。这是迄今为止准晶基热电材料的最高性能。

引用次数: 0

Optimizing microstructure and enhancing magnetic properties of anisotropic Nd-Fe-B spherical magnetic powders via regulating disproportionation temperature 通过调节歧化温度优化各向异性Nd-Fe-B球形磁粉的微观结构，增强磁性能

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia

Pub Date : 2025-11-17 DOI: 10.1016/j.scriptamat.2025.117092

Wenhao Zhang, Li Zhang, Shaolong Tang

This study employed spherical single-crystal Nd₂Fe₁₄B powder with a particle size of 100–150 μm as the precursor to investigate the effect of the disproportionation temperature (T_HD) during the Hydrogenation-Disproportionation-Desorption-Recombination (HDDR) process on the microstructural evolution and magnetic properties. At T_HD = 830 °C, the disproportionation reaction proceeded most completely, resulting in a typical lamellar morphology in the disproportionation phase. After desorption-recombination, the material developed submicron-sized grains (< 300 nm) with a distinct texture, where the grain size approached the single-domain critical size of Nd₂Fe₁₄B. Simultaneously, a relatively continuous Nd-rich phase formed along the grain boundaries. The resulting magnetic powder exhibited excellent comprehensive magnetic properties: remanence (B_r) = 1.23 T, coercivity (H_cj) = 1093.8 kA/m, and maximum energy product ((BH)_max) = 244.8 kJ/m³. This study demonstrates the feasibility of directly preparing anisotropic HDDR spherical magnetic powder from spherical single-crystal precursors.

本文采用粒径为100-150 μm的球形单晶Nd₂Fe₁₄B粉为前驱体，研究了氢化-歧化-解吸-复合（HDDR）过程中歧化温度（THD）对其显微组织演变和磁性能的影响。在THD = 830℃时，歧化反应进行得最彻底，歧化相呈现典型的片层状形态。解吸复合后，材料形成亚微米大小的晶粒（< 300 nm），具有明显的织构，晶粒尺寸接近Nd₂Fe₁₄B的单畴临界尺寸。同时，沿晶界形成了相对连续的富nd相。所制得的磁粉具有优异的综合磁性能：剩磁(Br) = 1.23 T，矫顽力（Hcj) = 1093.8 kA/m，最大能积（BH）max） = 244.8 kJ/m3。本研究证明了用球形单晶前驱体直接制备各向异性HDDR球形磁粉的可行性。

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引用次数: 0

Elastic-plastic deformation gradients and electrolytically charged hydrogen 弹塑性变形梯度与电解氢

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia

Pub Date : 2025-11-17 DOI: 10.1016/j.scriptamat.2025.117105

Sanjay Manda , Junaid Akhter , Bhargav Sudhalkar , Madhur Gupta , A. Durgaprasad , Aditya Prakash , Subrata Mukherjee , Ajay S. Panwar , Indradev Samajdar

Multi-scale atomistic simulations investigated the role of interstitial hydrogen in modulating the room-temperature carbon Snoek response in single-crystal bcc-iron. Complementary local dynamical mechanical analysis (nano-dma) experiments revealed an enhanced/stronger carbon Snoek response in the presence of interstitial hydrogen. This originated from elastic-plastic deformation gradients imposed through electrolytically charged hydrogen. Deformation gradients were conclusively established through ‘direct’ observations from X-ray and electron diffraction. The latter, in particular, provided microscopic evidence of hydrogen content and/or activity; and thereby holds ‘uncharted’ potentials for future research.

多尺度原子模拟研究了间隙氢在调节单晶bcc-铁中室温碳Snoek响应中的作用。互补的局部动态力学分析（nano-dma）实验显示，在间隙氢的存在下，碳Snoek响应增强/更强。这是由电解氢施加的弹塑性变形梯度引起的。通过x射线和电子衍射的“直接”观察，最终确定了变形梯度。后者尤其提供了氢含量和/或活性的微观证据；从而为未来的研究提供了“未知的”潜力。

引用次数: 0

Boosting energy storage at moderate fields in Sr₀.₇Bi₀.₂TiO₃ weakly polar relaxor via BiNi2/3Ta1/3O₃-induced ferroelectric-paraelectric composite structure 助推Sr 0 .₇Bi 0中等规模油田储能。通过bini2 / 3ta1 / 30o₃诱导的铁电-准电复合结构的2 TiO₃弱极性弛豫剂

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia

Pub Date : 2025-11-15 DOI: 10.1016/j.scriptamat.2025.117101

Yuming Mao , Jingji Zhang , Mo Chen , Min Fang , Ning Yan , Zhihao Lou , Yun Zhou

The weakly polar relaxor Sr₀.₇Bi₀.₂TiO₃ is renowned for its exceptional energy efficiency but suffers from low maximum polarization. To overcome this trade-off, we introduce BiNi_2/3Ta_1/3O₃ to design a composite structure of coexisting ferroelectric A₄B₃O₁₂ and paraelectric ABO₃ phases. With increasing dopant, the A₄B₃O₁₂ phase is progressively replaced by paraelectric ABO₃ and pyrochlore Bi₂Ti₂O₇, raising the phase-transition temperature. The optimal composition comprises 70.67% P4/mbm ABO₃, 28.49% Fmmm A₄B₃O₁₂, 0.75% Fd3m Bi₂Ti₂O₇, and 0.09% Pnna BiTaO₄, forming polar clusters and a coherent boundary between the ABO₃ and A₄B₃O₁₂ phases. This yields a high energy storage density of 5.12 J cm^-3 an ultrahigh efficiency of 97.13% at a high breakdown strength of 460 kV cm^-1, together with a figure of merit of 175.90 J cm^-3 and environment-independent stability. These results establish the composite as a highly promising candidate for high-performance dielectric energy-storage devices.

弱极性松弛器Sr 0 .₇Bi 0。₂TiO₃的能源效率很高，但最大极化率较低。为了克服这种权衡，我们引入bini2 / 3ta1 / 30o₃来设计一个共存的铁电相A4B3O12和亲电相ABO₃的复合结构。随着掺杂量的增加，A4B3O12相逐渐被准电ABO₃和焦绿石Bi2Ti2O7取代，相变温度升高。最佳组成为70.67% P4/mbm ABO₃，28.49% Fmmm A4B3O12, 0.75% Fd3m Bi2Ti2O7和0.09% Pnna BiTaO4，形成极性团簇和ABO₃和A4B3O12相之间的一致边界。在460 kV cm-1击穿强度下，储能密度高达5.12 J cm-3，效率高达97.13%，品质系数为175.90 J cm-3，稳定性与环境无关。这些结果使该复合材料成为高性能介电储能器件的极有前途的候选材料。

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引用次数: 0

On the effect of microstructural heterogeneity on yield point phenomena in architectured steel: Revealed by in-situ micro-digital image correlation (μDIC) 显微组织非均匀性对组织钢屈服点现象的影响——基于原位微数字图像相关（μDIC）的研究

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia

Pub Date : 2025-11-14 DOI: 10.1016/j.scriptamat.2025.117102

B. Yu , C. Pelligra , S. Asqardoust , Y. Emun , K. Abu Samk , H. Azizi , Y. Brechet , H. Zurob

Lüders banding in carbon steel is a manifestation of discontinuous yielding and limits the formability and surface quality of the steel. In this study, we explore the role of microstructure heterogeneity in suppressing the formation of Luder band. A ferritic steel was processed by decarburization, cold rolling, and controlled annealing to induce partial recrystallization and develop a heterogeneous grain structure. This micro-architectured material resembles a functionally graded structure and inhibits the propagation of Lüders bands. We propose a simple model in which heterogeneity disrupts the spatial coherence of yield front propagation. Suppression of Lüders bands was confirmed through tensile testing with micro- digital image correlation (DIC) and in-situ micro-tensile testing in Scanning Electron Microscopy (SEM). This heterostructure engineering approach demonstrates a viable alternative strategy for tuning the deformation behavior of ferritic steel.

碳素钢中的粗粒带是屈服不连续的表现，限制了钢的成形性和表面质量。在本研究中，我们探讨了微观结构异质性在抑制吕德带形成中的作用。对一种铁素体钢进行脱碳、冷轧和控制退火处理，诱导其部分再结晶，形成非均匀晶粒组织。这种微结构材料类似于一种功能梯度结构，可以抑制 ders波段的传播。我们提出了一个简单的模型，其中非均质性破坏了屈服锋传播的空间相干性。通过微数字图像相关（DIC）拉伸测试和扫描电镜（SEM）原位微拉伸测试，证实了l ders条带的抑制作用。这种异质结构工程方法为调整铁素体钢的变形行为提供了一种可行的替代策略。

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引用次数: 0

Direct atomic observation of large-angle lattice rotation in Cu3Pd Cu3Pd中大角度晶格旋转的直接原子观察

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia

Pub Date : 2025-11-13 DOI: 10.1016/j.scriptamat.2025.117099

Yujie Song , Huichao Duan , Tao Zheng , Qianning Dai , Kui Du

Grain rotation plays a critical role in grain growth of nanocrystalline materials, yet the underlying atomic-scale mechanisms, especially for large-angle rotation, remain poorly understood. Here, we report a 62.4° lattice rotation in Cu₃Pd nanocrystals by in-situ atomic resolution transmission electron microscopy (TEM) images. This rotation proceeds via a sequential two-step mechanism: double-shear-driven structural transition followed by atomic shuffling. The large-angle rotation suggests a potential coalescence between adjacent grains and provides an atomic-scale explanation for abnormal grain growth in intermetallic nanocrystals. These experiments establish a novel shear-shuffle paradigm for grain rotation, offering a new framework for understanding the structural evolution and nanocrystal coalescence.

晶粒旋转在纳米晶材料的晶粒生长中起着至关重要的作用，但其原子尺度的机制，特别是大角度旋转的机制仍然知之甚少。在这里，我们通过原位原子分辨率透射电子显微镜（TEM）图像报道了Cu3Pd纳米晶体的62.4°晶格旋转。这种旋转通过连续的两步机制进行：双剪切驱动的结构转变，然后是原子洗牌。大角度旋转表明相邻晶粒之间可能存在合并，并为金属间纳米晶体中异常晶粒生长提供了原子尺度上的解释。这些实验建立了一种新的剪切-洗牌模式，为理解结构演化和纳米晶体聚结提供了新的框架。

引用次数: 0

Deformation of metal-ceramic nanolaminates at extreme strain rates 金属陶瓷纳米层合材料在极端应变速率下的变形

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia

Pub Date : 2025-11-11 DOI: 10.1016/j.scriptamat.2025.117089

Jianxiong Li , Qi Tang , Nikhilesh Chawla , Mostafa Hassani

While the deformation mechanisms of Al-SiC nanolaminates under quasi-static and low stain rate conditions have been extensively studied, their behavior under ultra-high strain rates are not well-understood. Here we report on the high strain-rate behavior of Al-SiC metal-ceramic nanolaminates with layer thicknesses ranging from 10 to 100 nm by nanoindentation tests and laser induced microparticle impact tests. The effective strain rates spanned nine orders of magnitude, ranging from 10^–1 to 10⁸ s^-1. While the hardness of Al-SiC nanolaminates strongly depends on layer thickness at low strain rates, the differences progressively decreased with increasing strain rate, ultimately converging under ultra-high strain rate impact. At low strain rates, deformation progresses slowly, layer by layer; whereas with increasing strain rate, it transitions toward continuum, bulk-like behavior, where a large number of layers deform collectively and the mechanical response becomes increasingly governed by the volume fraction rather than the layer thickness of the constituents.

虽然Al-SiC纳米层合材料在准静态和低应变率条件下的变形机制已经得到了广泛的研究，但其在超高应变率下的行为尚未得到很好的理解。本文通过纳米压痕试验和激光诱导微粒冲击试验，研究了层厚为10 ~ 100 nm的Al-SiC金属陶瓷纳米层合材料的高应变率行为。有效应变速率范围为10-1 ~ 108 s-1，为9个数量级。在低应变速率下，Al-SiC纳米层合材料的硬度与层厚度密切相关，随着应变速率的增加，两者之间的差异逐渐减小，在超高应变速率下最终趋于一致。在低应变速率下，变形进展缓慢，逐层进行；然而，随着应变速率的增加，它向连续的、块状的行为转变，大量的层集体变形，力学响应越来越受体积分数的控制，而不是成分的层厚度。

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引用次数: 0

Plasticity encoding and mapping during elementary loading for accelerated mechanical properties prediction 初等加载过程中塑性编码与映射的加速力学性能预测

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia

Pub Date : 2025-11-11 DOI: 10.1016/j.scriptamat.2025.117082

Mathieu Calvat , Chris Bean , Dhruv Anjaria , Haoren Wang , Kenneth Vecchio , J.C. Stinville

Encoding metal plasticity captured from high-resolution digital image correlation (HR-DIC) is leveraged to predict a wide range of monotonic and cyclic macroscopic properties of metallic materials. To capture the spatial heterogeneity of plasticity that develops in metals, latent space features describing plasticity of small regions are spatially mapped across large fields. These latent space feature maps capture the complexity and heterogeneity of metal plasticity as a low-dimensional representation. These feature maps are then used to train a convolutional neural network-based model to predict monotonic and cyclic macroscopic properties. The approach is demonstrated on a large set of face-centered cubic metals, enabling rapid and accurate property prediction.

利用高分辨率数字图像相关（HR-DIC）对金属塑性进行编码，可以预测金属材料的大范围单调和循环宏观性能。为了捕捉金属中可塑性的空间异质性，描述小区域可塑性的潜在空间特征在大范围内进行了空间映射。这些潜在空间特征图捕捉了金属塑性的复杂性和异质性作为低维表示。然后使用这些特征映射来训练基于卷积神经网络的模型来预测单调和循环宏观特性。该方法在大量面心立方金属上进行了验证，实现了快速准确的性能预测。

引用次数: 0

Shock wave-induced multiple deformation modes in a HfNbZrVTi high-entropy alloy HfNbZrVTi高熵合金激波诱导的多种变形模式

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia

Pub Date : 2025-11-10 DOI: 10.1016/j.scriptamat.2025.117088

Jingyao He , Fan Zhang , Zezhou Li , Shipan Yin , Qinghui Tang , Linbing Zhang , Yang Liu , Jichen Xu , Xingwang Cheng

The deformation behaviors in HfNbZrVTi high-entropy alloy (HEA) under shock loading are investigated. We find that, in addition to dislocation slip, multiple deformation modes are activated, including {112} kink banding, {112}<111> deformation twinning, and body-centered cubic (BCC) to omega phase transition. Atomic-scale characterization of deformation interfaces reveals that pressure dependent kink banding is driven by the movement of a₀/2<111>{112} edge dislocation pairs, while the BCC to omega phase transition involves atomic shuffling of 1/12

[11 \bar{1}]

and 1/12

[\bar{1} \bar{1} 1]

on adjacent

{(2 \bar{1} 1)}_{BCC}

planes. Furthermore, the omega phase distributes at the twin boundary accompanied with the formation of transient omega phase. These findings reflect unique deformation behaviors of HEAs comprising mixed multiple elements in extreme loading conditions.

研究了HfNbZrVTi高熵合金（HEA）在冲击载荷下的变形行为。我们发现，除了位错滑移外，还激活了多种变形模式，包括{112}扭结带化、{112}<；111>；变形孪晶和体心立方（BCC）到欧米茄相变。变形界面的原子尺度表征表明，压力相关的扭结带是由a0/2<；111>；{112}边缘位错对的运动驱动的，而BCC到omega的相变涉及相邻（21¯1）BCC平面上1/12[111¯]和1/12[1¯1¯1]的原子变换。随着瞬态相的形成，欧米茄相分布在孪晶界处。这些发现反映了混合多单元HEAs在极端载荷条件下的独特变形行为。

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