Progress in Natural Science: Materials International最新文献_第2页

Multiscale analysis of epoxy asphalt curing behavior based on molecular dynamics simulation and experiments 基于分子动力学模拟与实验的环氧沥青固化行为多尺度分析

IF 7.1 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International

Pub Date : 2025-12-01 DOI: 10.1016/j.pnsc.2025.11.009

Jia Sun , Wei Huang , Yu Qin , Zhihan Zhang , Ali Rahman , Yue Huang , Yuhao Du , Sang Luo

The curing behavior of epoxy asphalt (EA) and its performance regulation mechanisms remain incompletely understood, which limits both material optimization and engineering applications. In this study, EA molecular models covering different epoxy system (ES) contents and curing degrees were constructed, the dynamic curing process was simulated using a Perl cross-linking script, and the reliability of the model was verified. Through a series of macro- and micro-scale tests, the curing kinetic parameters, characteristic group conversion, component distribution, and viscosity evolution during the curing process were analyzed. Additionally, high-precision simulation methods suitable for EA viscosity were compared and selected. The results indicated that the curing process of the ES follows an autocatalytic reaction mechanism, and under 60 °C isothermal curing conditions, the primary curing reaction is essentially completed within 24 h. The ES content significantly influenced the phase morphology, leading to a "sea-island structure" at high contents. As the ES content increased, the system viscosity rose notably, but temperature played a dual regulatory role: it accelerated the chemical curing reaction rate while significantly lowering the base viscosity of the system by enhancing molecular mobility. Molecular dynamics simulations further confirmed experimental results, revealing network formation at the molecular scale and the close correlation between component compatibility and macroscopic properties. Moreover, the Stokes-Einstein viscosity model achieved effective and reliable prediction during the high-temperature, pre-gelation stage. These findings provide a theoretical basis for optimizing EA formulations and construction parameters, offering important guidance for developing high-performance road materials.

环氧沥青的固化性能及其调控机理尚不完全清楚，这限制了材料的优化和工程应用。本研究构建了覆盖不同环氧体系（ES）含量和固化程度的EA分子模型，利用Perl交联脚本对动态固化过程进行了模拟，验证了模型的可靠性。通过一系列宏观和微观尺度的试验，分析了固化过程中的固化动力学参数、特征基团转换、组分分布和粘度演变。并对适合EA粘度的高精度模拟方法进行了比较和选择。结果表明，ES的固化过程遵循自催化反应机理，在60℃等温固化条件下，一次固化反应基本在24 h内完成。ES含量显著影响相形态，高含量时形成“海岛结构”。随着ES含量的增加，体系粘度明显升高，但温度起着双重调节作用：一方面加快了化学固化反应速率，另一方面通过提高分子迁移率，显著降低了体系的碱粘度。分子动力学模拟进一步证实了实验结果，揭示了分子尺度上的网状结构以及组分相容性与宏观性能之间的密切关系。此外，Stokes-Einstein黏度模型在高温预凝胶阶段实现了有效可靠的预测。研究结果为优化EA配方和施工参数提供了理论依据，对高性能道路材料的开发具有重要指导意义。

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引用次数: 0

Photon-counting X-ray and γ-ray perovskite semiconductor detectors: Fundamentals and advancements 光子计数x射线和γ射线钙钛矿半导体探测器：基本原理和进展

IF 7.1 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International

Pub Date : 2025-12-01 DOI: 10.1016/j.pnsc.2025.11.006

Lin Huang , Dongdong Zhang , Yanbin Li , Peng Zhang

X-ray and γ-ray detectors play a pivotal role in diverse fields, including medical imaging, industrial nondestructive testing, nuclear material detection, and public safety inspections. In recent years, lead halide perovskite semiconductors have emerged as promising alternatives to conventional photon-counting detection materials, leveraging their unique advantages such as high atomic numbers, high resistivity, large carrier mobility-lifetime products, and improved stability. Perovskite-based photon-counting detectors (PCDs) exhibit exceptional energy resolution, suppressed electronic noise, and superior multi-energy imaging capabilities, underscoring their transformative potential in high-energy radiation detection. This review systematically outlines the operational principles of semiconductor detectors, with a focus on the distinction between energy-integrating detectors (EIDs) and PCDs. It provides a comprehensive overview of advancements in perovskite single-crystal growth methodologies and their applications in X-ray and γ-ray photon-counting detection. Additionally, critical challenges in the field, such as improving single crystal quality, optimizing electrode configurations and mitigating ion migration, are addressed with innovative solutions. The review concludes by discussing future prospects and research directions, highlighting how perovskite PCDs are poised to revolutionize photon-counting detection systems across interdisciplinary applications.

x射线和γ射线探测器在医学成像、工业无损检测、核材料检测和公共安全检查等各个领域发挥着关键作用。近年来，卤化铅钙钛矿半导体已成为传统光子计数检测材料的有前途的替代品，利用其独特的优势，如高原子序数，高电阻率，大载流子迁移寿命产品和改进的稳定性。基于钙钛矿的光子计数探测器（PCDs）表现出卓越的能量分辨率、抑制电子噪声和优越的多能成像能力，强调了它们在高能辐射探测方面的变革潜力。本文系统地概述了半导体探测器的工作原理，重点介绍了能量积分探测器（eid）和能量积分探测器（PCDs）的区别。它全面概述了钙钛矿单晶生长方法的进展及其在x射线和γ射线光子计数检测中的应用。此外，该领域的关键挑战，如提高单晶质量，优化电极配置和减轻离子迁移，都通过创新的解决方案来解决。本文最后讨论了未来的前景和研究方向，强调了钙钛矿型PCDs如何在跨学科应用中彻底改变光子计数检测系统。

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引用次数: 0

Vanadium disulfide monolayers for efficient sensing of target volatile organic compounds 用于有效检测目标挥发性有机化合物的二硫化钒单分子膜

IF 7.1 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International

Pub Date : 2025-10-01 DOI: 10.1016/j.pnsc.2025.07.003

Raja Naveed Ahmed , Muhammad Abdul Rauf Khan , Sadaf Akhtar , Azhar Ahmed , Tanveer Hussain , Muhammad Mushtaq

The presence of volatile organic compounds (VOCs) in the atmosphere seriously threatens the environment and human health. Therefore, designing efficient nanosensors to detect the targeted VOCs is inevitable. In the present study, using density functional theory (DFT), the adsorption of two prominent VOCs, namely propylene oxide (PO) and crotonaldehyde (CRA), was studied on pristine and titanium/chromium (Ti/Cr)-doped vanadium disulfide (Ti/Cr-VS₂) monolayers in both trigonal prismatic (H) and octahedral (T) phases. Van der Waals-corrected DFT calculations revealed that the doping of the Ti atom in VS₂ is favorable in comparison with Cr doping for both phases. It was observed that the pristine VS₂ systems exhibited weak adsorption towards the above-mentioned VOCs. However, doping of Ti in VS₂ systems significantly enhanced the adsorption of PO and CRA molecules. The calculated adsorption energy of PO on the T phase of Ti-VS₂ systems was −1.66 eV, and for CRA on the H phase of Ti-VS₂ systems was −1.71 eV, respectively. Bader charge analysis showed that PO and CRA behave as charge donors to the Ti-VS₂. Upon PO/CRA adsorptions, significant changes were observed in the work function of Ti-VS₂. Based on our DFT analysis for adsorption parameters, we believe Ti-VS₂ could be a promising material for detecting PO and CRA.

大气中挥发性有机化合物（VOCs）的存在严重威胁着环境和人类健康。因此，设计高效的纳米传感器来检测目标VOCs是必然的。本研究利用密度泛函理论（DFT），研究了原始和钛/铬（Ti/Cr）掺杂二硫化钒（Ti/Cr- vs2）单层在三角棱柱体(H)和八面体(T)相上对环氧丙烷（PO）和丁醛（CRA）两种主要挥发性有机化合物的吸附。Van der waals校正DFT计算表明，与Cr掺杂相比，VS2中Ti原子的掺杂对两相都有利。结果表明，原始VS2系统对上述挥发性有机化合物的吸附能力较弱。然而，在VS2体系中掺杂Ti显著增强了PO和CRA分子的吸附。计算得到PO在Ti-VS2体系T相上的吸附能为- 1.66 eV， CRA在Ti-VS2体系H相上的吸附能为- 1.71 eV。Bader电荷分析表明，PO和CRA是Ti-VS2的电荷供体。PO/CRA吸附后，Ti-VS2的功函数发生了显著变化。基于对吸附参数的DFT分析，我们认为Ti-VS2可能是一种很有前途的检测PO和CRA的材料。

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引用次数: 0

Upgrading the performance of Ni-based cermet by ultra-fast pressureless sintering coupled with oxide doping 超高速无压烧结与氧化物掺杂相结合提高镍基陶瓷的性能

IF 7.1 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International

Pub Date : 2025-10-01 DOI: 10.1016/j.pnsc.2025.08.003

Zhen Wan , Hongbing Peng , Guoyu Qian , Sheng Pang , Yiwei Sun , Jie Zhou , Zhi Wang

Metal-ceramics have been shown to be a high-performance inert anode material, effectively solving the high carbon emissions and C-F gas release issues of traditional carbon anodes in aluminum electrolysis. However, a major challenge for the preparation of metal-ceramic inert anode materials is the synergistic improvement of conductivity and strength. Herein, a new method of ultrafast pressureless sintering (UPS) coupled with oxide doping is developed to synergistic improve the conductivity, strength and corrosion resistance of cermet inert anode materials. This method involves the integration of oxide doping with ultrafast pressureless sintering (UPS), a process that significantly improves the aforementioned performance parameters. In contrast to conventional sintering, the novel method employs UPS to achieve rapid diffusion and uniform distribution of metal phases along the interfaces of regular ceramic particles. This combination of oxide doping-induced solid-solution lattice distortion is expected to enhance the comprehensive performance of the material. The preparation of high-performance Ni-based metalceramic inert anode materials was achieved through the optimisation of interfacial diffusion kinetics and the regulation of lattice defects, resulting in a 7 % increase in densification, a 33 % increase in hardness, a 24-fold increase in electrical conductivity, and an 80 % reduction in corrosion rate. This method provides an efficient and environmentally friendly path for the preparation of high-performance aluminium electrolytic inert anodes with its low energy consumption and high efficiency.

金属陶瓷已被证明是一种高性能的惰性阳极材料，有效地解决了铝电解中传统碳阳极的高碳排放和C-F气体释放问题。然而，金属陶瓷惰性阳极材料的制备面临的主要挑战是电导率和强度的协同提高。为了提高金属陶瓷惰性阳极材料的导电性、强度和耐腐蚀性，提出了一种超快无压烧结（UPS）与氧化物掺杂耦合的新方法。这种方法涉及到氧化物掺杂与超快无压烧结（UPS）的集成，这一过程显著提高了上述性能参数。与传统烧结相比，该方法利用UPS实现了金属相沿规则陶瓷颗粒界面的快速扩散和均匀分布。这种氧化物掺杂引起的固溶晶格畸变的组合有望提高材料的综合性能。通过优化界面扩散动力学和调节晶格缺陷，制备了高性能镍基金属陶瓷惰性阳极材料，致密性提高了7%，硬度提高了33%，电导率提高了24倍，腐蚀速率降低了80%。该方法具有低能耗、高效率的特点，为制备高性能铝电解惰性阳极提供了一条高效、环保的途径。

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引用次数: 0

Effect of La doping on tritium storage properties of Ti-based alloys La掺杂对ti基合金氚储存性能的影响

IF 7.1 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International

Pub Date : 2025-10-01 DOI: 10.1016/j.pnsc.2025.07.005

Jiehong Ping , Shuai Wang , Xinlong Shen , Guo Yang , Caiyi Zhang , Yejun Li , Haiyan Leng , Xingbo Han

The development of efficient and stable tritium storage materials is critical for advancing accelerator-based neutron sources. Here, we investigate the effect of lanthanum (La) doping on the hydrogen storage properties of Ti-based alloys through a combination of first-principles calculations and experimental validation. Density functional theory calculations reveal that La doping enhances hydrogen binding by forming multi-center hybrid states and increases the diffusion barrier of hydrogen within the Ti lattice. Experimentally, La doping improves the hydrogen-to-metal (H/M) ratio from 1.89 to 2.05, reduces the activation temperature by 100 °C, and enhances the thermal stability of Ti-based alloy hydride, as evidenced by DTA results. Kinetic studies show that La doping reduces the activation energy for the hydrogen absorption reaction of Ti-based alloy from 5.6 kJ/mol to 3.5 kJ/mol. These findings demonstrate that La-doped Ti-based alloys are promising candidates for high-performance tritium storage applications, providing critical insights into the design of advanced hydrogen isotope storage materials.

开发高效、稳定的氚储存材料是推进加速器中子源的关键。本文通过第一性原理计算和实验验证相结合的方法，研究了镧（La）掺杂对ti基合金储氢性能的影响。密度泛函理论计算表明，La掺杂通过形成多中心杂化态增强了氢结合，增加了氢在Ti晶格内的扩散势垒。实验结果表明，La掺杂使氢金属比（H/M）由1.89提高到2.05，活化温度降低100℃，增强了ti基合金氢化物的热稳定性。动力学研究表明，La掺杂使ti基合金吸氢反应的活化能从5.6 kJ/mol降低到3.5 kJ/mol。这些发现表明，la掺杂的ti基合金是高性能氚存储应用的有希望的候选者，为设计先进的氢同位素存储材料提供了重要的见解。

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引用次数: 0

High-throughput quantitative characterization of pitting corrosion in 907A steel based on multi-dimensional information strategy combined with deep learning image identification 基于多维信息策略结合深度学习图像识别的907A钢点蚀高通量定量表征

IF 7.1 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International

Pub Date : 2025-10-01 DOI: 10.1016/j.pnsc.2025.07.004

Wenyu Zhang , Weihao Wan , Qun Ren , Zhanbin Liu , Xiaofen Zhang , Lei Zhao , Lixia Yang , Song Chai , Mengru Shi , Hui Wang , Xuejing Shen , Haizhou Wang

The quantitative characterization of pitting corrosion (PC) defects in steel is crucial for enhancing its performance and extending its service life. In this study, quantitative characterization of PC in 907A steel had been achieved combined with commercial mathematical software and deep learning (DL) image recognition of data collected by two-dimensional (2D) and three-dimensional (3D) high-throughput characterization (HTC) methods. Firstly, all information of 907A low-alloy steel microstructure with sample in centimeter scale was recorded by metallurgical microscope (MM) and white light interferometer (WLI) for rapid corrosion pits (CP) screening using multi-dimensional microstructure analysis method. Secondly, the U-Net DL algorithm was applied to label and intelligently recognize PC in images. On this basis, MATLAB 2020a software was utilized to perform mathematical calculations, enabling the quantitative recognition and analysis of the location, size, and depth of these PC. Finally, a relationship was established between the quantitative results of multi-dimensional information of CP based on high-throughput original position statistical mapping characterization technology, achieving comprehensive judgment, location, size distribution, and depth distribution of CP in the entire range of 907A steel. This serves as a valuable reference for the efficient and rapid characterization of PC defects in subsequent metal materials.

钢中点蚀缺陷的定量表征对提高钢的性能和延长钢的使用寿命至关重要。在本研究中，结合商业数学软件和对二维（2D）和三维（3D）高通量表征（HTC）方法收集的数据进行深度学习（DL）图像识别，实现了907A钢中PC的定量表征。首先，利用金相显微镜（MM）和白光干涉仪（WLI）记录了907A低合金钢样品在厘米尺度上的所有显微组织信息，利用多维显微组织分析方法进行腐蚀坑快速筛选。其次，采用U-Net DL算法对图像中的PC进行标记和智能识别。在此基础上，利用MATLAB 2020a软件进行数学计算，对这些PC机的位置、大小、深度进行定量识别和分析。最后，基于高通量原始位置统计映射表征技术，建立CP多维信息定量结果之间的关系，实现对907A钢全范围CP的位置、尺寸分布、深度分布的综合判断。这为后续金属材料中PC缺陷的高效、快速表征提供了有价值的参考。

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引用次数: 0

Synchrotron X-ray imaging of bubble formation, growth and dissolution behaviors in Al-Mn alloy Al-Mn合金中气泡形成、生长和溶解行为的同步x射线成像

IF 7.1 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International

Pub Date : 2025-10-01 DOI: 10.1016/j.pnsc.2025.09.002

Tian Liang , Yuefeng Jiang , Wenquan Lu , Yingche Ma

We elucidated the dynamic evolution of bubble formation, growth, motion and dissolution behaviors during heating of Al-10 wt% Mn alloy by synchrotron radiography. The hydrogen bubbles in Al-Mn alloy melt primarily stem from two sources: Al reactions with water vapor in surrounding air and the oxide bi-films. Once spherical bubbles form in Al matrix melt, they grow firstly and then dissolve into melt gradually. And the roles of intermetallic compounds (IMCs) in different stages of bubble evolution are different. At first IMCs block bubble growth physically and then slight accelerate bubble dissolution at later stage. Whether hydrogen bubbles grow or shrink is determined by the physical obstruction of IMCs, hydrogen absorption and the dissolution of bubbles. Furthermore, the time and distance (l_d) required to establish a stable solute distribution around IMCs differ with their size, with larger IMCs having a larger l_d.

利用同步射线摄影技术研究了al - 10wt % Mn合金在加热过程中气泡形成、生长、运动和溶解行为的动态演变过程。铝锰合金熔体中的氢气泡主要来源于两个方面：铝与周围空气中的水蒸气反应和氧化双膜。铝基熔体中一旦形成球形气泡，气泡先长大，然后逐渐溶解为熔体。金属间化合物（IMCs）在气泡演化的不同阶段所起的作用也不同。初期IMCs物理上阻碍气泡的生长，后期则略微加速气泡的溶解。氢气气泡的生长或收缩是由IMCs的物理阻碍、氢气的吸收和气泡的溶解决定的。此外，在imc周围建立稳定溶质分布所需的时间和距离（ld）随imc的大小而不同，imc越大，ld也越大。

引用次数: 0

Review on the fundamental and application of melt overheating technology in Ni-based superalloys manufacturing 熔体过热技术在镍基高温合金制造中的基础及应用综述

IF 7.1 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International

Pub Date : 2025-10-01 DOI: 10.1016/j.pnsc.2025.08.001

Qiongyuan Zhang , Jiali Tang , Atao Yang , Jiangshan Zhang , Lin Wu , Guangchao Guo

Melt overheating is one of the cost-efficient technologies to tailor the liquid-state structure and improve the solid superalloy properties. This review focuses on the fundamental and application of melt overheating technology in Ni-based superalloys manufacturing. During the overheating treatment, compositional changes occur, including element evaporation and burning, as well as alterations in impurity and cleanliness. The effect of melt overheating is also discussed on the microstructure of Ni-based superalloys in terms of liquid metal structure, reinforcement phases, carbide, dendritic structure, and elemental segregation. The key process parameters and the influenced properties are summarized; it is found that rupture life, fatigue life, tensile property and hardness of superalloys can be well improved when proper overheating parameters are used. Especially, the rupture life increases by more than 3 times. While melt overheating effectively mitigates compositional instability and reduces gas-phase impurities through optimized temperature and time parameters, its full potential requires addressing database, machine learning, crucible materials and vacuum systems under various overheating conditions. Future interdisciplinary efforts combining computational metallurgy, AI-driven methods, and novel protective technologies will enable precise tailoring of overheating protocols for next-generation superalloys.

熔体过热是调整液态结构和改善固体高温合金性能的一种经济有效的技术。本文综述了熔体过热技术的基本原理及其在镍基高温合金制造中的应用。在过热处理期间，会发生成分变化，包括元素蒸发和燃烧，以及杂质和清洁度的变化。从液态金属组织、增强相、碳化物、枝晶组织和元素偏析等方面讨论了熔体过热对镍基高温合金微观组织的影响。总结了关键工艺参数及其对性能的影响；结果表明，采用适当的过热参数可以提高高温合金的断裂寿命、疲劳寿命、拉伸性能和硬度。特别是，断裂寿命提高3倍以上。虽然熔体过热通过优化温度和时间参数有效地减轻了成分的不稳定性，减少了气相杂质，但它的全部潜力需要解决数据库、机器学习、坩埚材料和各种过热条件下的真空系统。未来跨学科的努力将计算冶金、人工智能驱动的方法和新型保护技术相结合，将使下一代高温合金的过热方案能够精确定制。

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引用次数: 0

Structure engineering to boost superconducting properties of Fe(Se,Te) polycrystalline 提高Fe（Se,Te）多晶超导性能的结构工程

IF 7.1 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International

Pub Date : 2025-10-01 DOI: 10.1016/j.pnsc.2025.09.003

Jixing Liu, Botao Shao, Shengnan Zhang, Jianfeng Li, Pingxiang Zhang, Lian Zhou

Fe_1.0Se_0.5Te_0.5 polycrystalline samples were successfully synthesized using an efficient one-step sintering method incorporating controlled annealing process during cooling stage. Based on a systematical optimization process, heat treatment process with 48 h dwell time at 900 C was adopted to obtain high superconducting phase content with relatively short sintering time. Meanwhile, an annealing process was introduced during the cooling stage to further increase the superconducting phase content and tune the chemical composition of superconducting phase. This annealing strategy enhanced the (00l) texturing degree and the c-axis spacing of tetragonal superconducting phase, which directly translated to superior superconducting performance metrics. Compared to conventionally processed samples, the annealed samples demonstrated remarkable enhancements: critical current density increased by 50%, upper critical field improved by 60%, and thermally activated flux flow activation energy elevated by 50%. This structure engineering process via an easy heat treatment technology to boost superconducting properties of Fe(Se, Te) polycrystalline establishes a practical framework for performance enhancement in iron-based superconductors.

采用高效的一步烧结方法，结合冷却阶段的受控退火工艺，成功合成了Fe1.0Se0.5Te0.5多晶样品。在系统优化工艺的基础上，采用900℃保温48 h的热处理工艺，以较短的烧结时间获得较高的超导相含量。同时，在冷却阶段引入退火工艺，进一步提高了超导相含量，调整了超导相的化学成分。该退火策略提高了（00l）织构度和四方超导相的c轴间距，直接转化为优异的超导性能指标。与常规处理的样品相比，退火后的样品表现出显著的增强：临界电流密度提高了50%，上临界场提高了60%，热激活通量活化能提高了50%。该结构工程过程通过简单的热处理技术来提高Fe（Se, Te）多晶的超导性能，为提高铁基超导体的性能建立了一个实用的框架。

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引用次数: 0

Exploring hot formability and strengthening mechanisms of a Co39.2Ni39.2Al19.6Ti2 dual-phase high entropy alloy 探讨Co39.2Ni39.2Al19.6Ti2双相高熵合金的热成形性及强化机理

IF 7.1 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International

Pub Date : 2025-10-01 DOI: 10.1016/j.pnsc.2025.06.009

Mingyang Li , Ni Jin , Haoxiang Liu , Ning Zhao , Xudong Liu , Yixuan He

Dual-phase high entropy alloys demonstrate outstanding strength-ductility combination, however, the microstructure evolution during thermal processing and the strengthening mechanisms of the alloy after thermal processing still lack in-depth investigations. In this study, the dynamic recrystallization behaviors and microstructural evolution of the Co_39.2Ni_39.2Al_19.6Ti₂ dual-phase high entropy alloy were investigated over a temperature range from 950 °C to 1100 °C and a strain rate range from 1 s⁻¹ to 0.001 s⁻¹. The stress-strain curves have been accurately predicted using the Arrhenius constitutive equations, and the optimal thermal processing parameters was determined as 1050 °C/0.001 s⁻¹ through the established hot processing map. Characterization of the microstructure after thermal processing confirmed that microstructure obtained after optimal processing exhibited a high degree of dynamic recrystallization with no obvious texture. Further investigations revealed that in Co_39.2Ni_39.2Al_19.6Ti₂ dual-phase high entropy alloy, the dynamic recrystallization process of B2 phase was ahead of FCC phase under the same conditions, and three dynamic recrystallization mechanisms were found during the deformation process. After the optimal processing, the mechanical properties of the alloy showed great improvement, where the mechanical properties enhancement mechanisms arose from grain-refinement strengthening and the phase-interface strengthening. This study provides a comprehensive investigation into the thermoforming behavior and mechanical property optimization of dual-phase high entropy alloys.

双相高熵合金表现出优异的强度-塑性结合性能，但热处理过程中的组织演变及热处理后的强化机理仍缺乏深入的研究。本文研究了Co39.2Ni39.2Al19.6Ti2双相高熵合金在950℃~ 1100℃、1 s−1 ~ 0.001 s−1应变速率范围内的动态再结晶行为和组织演变。利用Arrhenius本构方程对应力应变曲线进行了准确预测，并通过建立的热加工图确定了最佳热处理参数为1050℃/0.001 s−1。热处理后的组织表征证实，优化后的组织表现出高度的动态再结晶，没有明显的织构。进一步研究发现，在相同条件下，Co39.2Ni39.2Al19.6Ti2双相高熵合金中，B2相的动态再结晶过程先于FCC相，并且在变形过程中发现了三种动态再结晶机制。经过优化处理后，合金的力学性能得到了较大的改善，其力学性能增强机制主要表现为晶粒细化强化和相界面强化。本研究对双相高熵合金的热成形行为和力学性能优化进行了全面的研究。

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引用次数: 0