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

MXene based flexible microheater for enhanced infrared imaging of cerebral blood flow 用于增强脑血流红外成像的基于 MXene 的柔性微加热器

IF 4.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International

Pub Date : 2024-10-01 DOI: 10.1016/j.pnsc.2024.07.018

Qinli Ye , Jinghui Lin , Guoxiang Wang , Shuwen Zeng , Tao Jiang , Xiang Gao , Muhammad Danang Birowosuto , Wei Xiong , Chenjie Gu

Infrared thermography technology is a noninvasiveness and real-time imaging method, it has attracted enormous attentions for blood flow imaging. However, the implementation of infrared thermography technology is still limited by the poor imaging quality caused by the low temperature discrimination between the target blood vessel and background. Herein, we reported a flexible and low-cost MXene based photothermal microheater for enhancing the infrared imaging of blood flow. In the experiment, MXene films with specific thickness was prepared by vacuum filtering different concentrations of MXene colloidal solutions. Thereafter, the microheaters were fabricated by assembling the MXene films on the PU tape/PDMS substrate, and then sealed with another layer of pure PDMS film on the top of MXene film. The photothermal performance of the microheaters were evaluated by using an 808-nm laser as the exciting source. Experimental results show that the optimal microheater (MXene content: 17.5 mg) can reach a safe temperature of 41.5 °C with 43.9 s under the light irradiation of 100 mW·cm⁻². Moreover, it can be stabilized at the equilibrium temperate for over 25 min. Finally, the above optimal microheater was used to accurately heat the simulated blood vessel. It shows that temperature difference of 3.3 °C can be induced between the heated blood vessel and environment. As a result, it significantly enhances the quality of the infrared imaging of the blood flow in the simulated vascular network.

红外热成像技术是一种无创、实时的成像方法，在血流成像方面备受关注。然而，由于目标血管与背景之间的温度辨别度较低，导致成像质量不高，红外热成像技术的应用仍然受到限制。在此，我们报告了一种灵活且低成本的基于 MXene 的光热微加热器，用于增强血流的红外成像。实验中，通过真空过滤不同浓度的 MXene 胶体溶液制备了特定厚度的 MXene 薄膜。然后，将 MXene 薄膜组装在 PU 胶带/PDMS 衬底上，再在 MXene 薄膜上封上一层纯 PDMS 薄膜，就制成了微加热器。使用 808 纳米激光作为激发光源，对微加热器的光热性能进行了评估。实验结果表明，在 100 mW-cm-2 的光照射下，最佳微加热器（MXene 含量：17.5 mg）可在 43.9 秒内达到 41.5 °C 的安全温度。此外，它还能在平衡温度下稳定 25 分钟以上。最后，利用上述最佳微加热器对模拟血管进行了精确加热。结果表明，加热后的血管与环境之间可产生 3.3 °C 的温差。因此，它大大提高了模拟血管网络中血流的红外成像质量。

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引用次数: 0

High temperature liquid shock manufacturing of RuNi catalysts for hydrogen evolution reaction 用于氢进化反应的 RuNi 催化剂的高温液态冲击制造技术

IF 4.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International

Pub Date : 2024-10-01 DOI: 10.1016/j.pnsc.2024.07.012

Liming Li , Peng Kang , Donghui Feng , Yuguang Zhang , Hangxing Ren , Yanchang Liu , Xiaoya Cui

Rational design and production of materials for highly effective and environmental-friendly electrocatalytic hydrogen evolution reaction (HER) play a pivotal role in advancing renewable energy utilization. Structural engineering of noble metal nanomaterials can significantly boost catalytic performance through atomic rearrangement, electronic structure modification and surface reactivity modulation. Here, RuNi alloy is synthesized using a novel high temperature liquid shock method (HTLS) with instant Joule heating treatment at 1073 K under the mixed atmosphere of Argon (Ar) and CO. The synthesis process involves an aqueous solution containing metal precursors, capping agents, reductant agents and carbon black. Particularly, the as-prepared RuNi-HTS nanostructures with hexagonal close-packed (hcp) phase demonstrate impressive electrocatalytic HER activity in alkaline conditions, requiring only 28 mV of overpotentials at a current density of 10 mA cm⁻². Note that the Tafel slope is 159.2 mV dec⁻¹. Furthermore, this versatile HTLS method can be extended to synthesize other catalysts, including Ru-HTS, PtRu, and PtZn, all of which show commendable performance for HER as well. This study lays the groundwork for the strategic design and high-throughput synthesis of novel materials with fine-tuned structure and refined size, enabling highly efficient and environmental-friendly electrocatalysis.

合理设计和生产高效、环保的电催化氢进化反应（HER）材料在推进可再生能源利用方面发挥着关键作用。贵金属纳米材料的结构工程可以通过原子重排、电子结构改性和表面反应活性调制来显著提高催化性能。本文采用新型高温液态冲击法（HTLS），在氩气（Ar）和二氧化碳（CO）混合气氛下于 1073 K 温度下进行瞬间焦耳加热处理，合成了 RuNi 合金。合成过程涉及含有金属前体、封端剂、还原剂和炭黑的水溶液。特别是所制备的具有六方紧密堆积（hcp）相的 RuNi-HTS 纳米结构在碱性条件下表现出令人印象深刻的电催化 HER 活性，在 10 mA cm-2 的电流密度下仅需要 28 mV 的过电位。请注意，塔菲尔斜率为 159.2 mV dec-1。此外，这种多用途 HTLS 方法还可扩展用于合成其他催化剂，包括 Ru-HTS、PtRu 和 PtZn，所有这些催化剂在 HER 方面也都表现出令人称道的性能。这项研究为具有微调结构和精细尺寸的新型材料的战略设计和高通量合成奠定了基础，从而实现高效环保的电催化。

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引用次数: 0

A polyelectrolyte-induced highly processable pigment-like photonic crystal ink 聚电解质诱导的高可加工颜料状光子晶体墨水

IF 4.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International

Pub Date : 2024-10-01 DOI: 10.1016/j.pnsc.2024.07.022

Guangxin Tan , Wenxin Fan , Zhihong Nie , Kunyan Sui

Developing a straightforward strategy for constructing highly processable photonic crystals (PCs) is crucial for various applications, yet remains a challenge. Here, we present a simple polyelectrolyte-induced self-assembly strategy for producing novel photonic crystal (PC) inks with outstanding processing flexibility by adding the polyelectrolytes into the ultralow concentration of colloidal nanoparticle solution. The polyelectrolyte can cover the nanoparticles through the hydrogen bond interaction to induce the aggregation and mutual repulsion of them simultaneously, enabling the self-assembly of ultralow concentration (0.01–1.0 v/v%) of nanoparticles into short-range ordered arrays with angle-independent structural colors. The resulting PC inks present unprecedented pigment-like color modulation capacity, as well as ultrahigh freedom in processing methods due to the fact that the rheological behaviors of PC inks can be widely adjusted by varying the properties of polyelectrolytes. Consequently, the PC inks can be easily shaped into complex and exquisite multicolor patterns/3D structures using various techniques, including injection molding, writing, drawing, and 3D printing. This general approach paves the way for quick and scalable production of advanced PC materials deeply required in practical applications.

开发一种构建高度可加工光子晶体（PC）的简单策略对于各种应用至关重要，但这仍然是一项挑战。在这里，我们提出了一种简单的聚电解质诱导自组装策略，通过在超低浓度的胶体纳米粒子溶液中加入聚电解质，生产出具有出色加工灵活性的新型光子晶体（PC）油墨。聚电解质可通过氢键作用覆盖纳米粒子，同时诱导它们聚集和相互排斥，使超低浓度（0.01-1.0 v/v%）的纳米粒子自组装成具有与角度无关的结构颜色的短程有序阵列。由于 PC 油墨的流变特性可通过改变聚电解质的性质进行广泛调整，因此所产生的 PC 油墨具有前所未有的类似颜料的色彩调制能力，以及超高的加工方法自由度。因此，PC 油墨可以通过注塑、书写、绘制和三维打印等各种技术轻松塑造成复杂精美的多色图案/三维结构。这种通用方法为快速、可扩展地生产实际应用所需的先进 PC 材料铺平了道路。

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引用次数: 0

Advancements in the development of liquid organic hydrogen carrier systems and their applications in the hydrogen economy 液态有机氢载体系统的开发进展及其在氢经济中的应用

IF 4.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International

Pub Date : 2024-10-01 DOI: 10.1016/j.pnsc.2024.07.021

Alexis Munyentwali , Khai Chen Tan , Teng He

The transition towards sustainable and clean energy systems has become a significant concern in the modern world. Hydrogen has the potential to meet the growing energy demands while addressing greenhouse gas emissions. However, one major obstacle in utilizing hydrogen as a fuel is the lack of efficient and cost-effective storage methods. In this regard, liquid organic hydrogen carriers (LOHCs) offer several advantages, including high hydrogen storage capacity, improved safety compared to traditional storage methods, and the ability to transport hydrogen using existing liquid fuels’ infrastructure. This review summarizes advancements in the development of LOHC systems for hydrogen storage, with a focus on the latest and innovative systems such as those based on dehydrogenative coupling reactions, renewable LOHCs from lignocellulosic biomass, and the development of LOHCs from plastic waste recycling. In addition to the material aspect, this contribution also discusses various applications of LOHCs in the broader context of the hydrogen economy, including a recently proposed concept of mixed gas hydrogenation of LOHCs for realizing hydrogen purification and storage in a single process step. By highlighting the main advantages and challenges of each LOHC system and providing future directions in the development of efficient LOHC systems, this review aims to contribute to an extensive understanding and advancement of LOHCs in the evolving hydrogen-based economy.

向可持续和清洁能源系统过渡已成为当今世界的重大关切。氢有可能满足日益增长的能源需求，同时解决温室气体排放问题。然而，利用氢作为燃料的一个主要障碍是缺乏高效、经济的储存方法。在这方面，液态有机氢载体（LOHC）具有多项优势，包括储氢能力强、与传统储氢方法相比安全性更高，以及能够利用现有的液体燃料基础设施运输氢气。本综述总结了用于储氢的液态有机氢载体系统的开发进展，重点关注最新的创新系统，如基于脱氢偶联反应的系统、从木质纤维素生物质中提取的可再生液态有机氢载体，以及从塑料废物回收中提取的液态有机氢载体的开发。除了材料方面，这篇论文还讨论了 LOHC 在更广泛的氢经济背景下的各种应用，包括最近提出的 LOHC 混合气体氢化概念，以在单一工艺步骤中实现氢气纯化和储存。通过强调每种 LOHC 系统的主要优势和挑战，并提供高效 LOHC 系统的未来发展方向，本综述旨在促进对 LOHC 在不断发展的氢基经济中的广泛理解和进步。

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引用次数: 0

Three-dimensional quantitative characterization of defects in inconel 625 superalloy based on deep learning image identification 基于深度学习图像识别的 inconel 625 超级合金缺陷三维定量表征

IF 4.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International

Pub Date : 2024-10-01 DOI: 10.1016/j.pnsc.2024.07.015

Wenyu Zhang , Qun Ren , Weihao Wan , Mengru Shi , Xiaofen Zhang , Lei Zhao , Lixia Yang , Cheng Zhong , Suran Liu , Song Chai , Yaxin Ma , Haizhou Wang

Three-dimensional (3D) quantitative characterization of defects in superalloys is an important way to promote the ability of material design and service life prediction. In this work, 3D spatial distribution of defects for Inconel 625 superalloy manufactured by laser additive manufacturing (LAM) is carried out deep learning (DL) image identification technology and 3D image reconstruction. Firstly, computer tomography (CT) technology was used to obtain continuous slice images of sample. The U-net DL algorithm was applied to intelligently identify material defects in the continuous slices. On this basis, quantitative identification and analysis of spatial defect positions and typical sizes is achieved by using 3D reconstruction software. Compared with traditional threshold segmentation (TS) techniques, the defect recognition rate has significantly improved from 61.90 % to 95.00 %. This work provides a promising characterization method for efficient characterizing alloy defects and damage especially during material performance evaluation.

超合金缺陷的三维（3D）定量表征是提高材料设计和使用寿命预测能力的重要途径。本研究采用深度学习（DL）图像识别技术和三维图像重建技术，对激光增材制造（LAM）工艺制造的Inconel 625超耐热合金的缺陷进行了三维空间分布分析。首先，使用计算机断层扫描（CT）技术获取样品的连续切片图像。应用 U-net DL 算法对连续切片中的材料缺陷进行智能识别。在此基础上，利用三维重建软件对空间缺陷位置和典型尺寸进行定量识别和分析。与传统的阈值分割（TS）技术相比，缺陷识别率从 61.90% 显著提高到 95.00%。这项工作为有效表征合金缺陷和损伤（尤其是在材料性能评估过程中）提供了一种前景广阔的表征方法。

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引用次数: 0

The current research status and prospects of AI in chemical science 人工智能在化学科学中的研究现状与前景

IF 4.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International

Pub Date : 2024-10-01 DOI: 10.1016/j.pnsc.2024.08.003

Minghao Yuan , Qinglang Guo , Yingxue Wang

This paper primarily examines the utilization and obstacles of AI in the domain of chemistry. Machine learning facilitates the advancement of chemical research at every level through the use of AI. AI has significantly contributed to enhancing the efficiency of chemical experiments and manufacturing, as well as reducing costs, throughout the many phases of chemical study, application, and production. Its impact is particularly notable in the development of new materials and the discovery of drugs. Nevertheless, the implementation of AI in the domain of chemistry encounters numerous obstacles, including inadequate data quality, limited model interpretability, and data privacy concerns. To address these issues, it is imperative for the scientific and technological community to foster multidisciplinary collaboration, develop a more comprehensive and practical AI framework, and investigate more secure data security technologies. In the future, as AI continues to advance, the relationship between AI and chemical research will become more dependable and intimate. This will lead to increased efficiency, safety, and cost-effectiveness in chemical research, ushering in a new era in the field of chemistry.

本文主要探讨人工智能在化学领域的应用和障碍。通过使用人工智能，机器学习在各个层面促进了化学研究的发展。在化学研究、应用和生产的多个阶段，人工智能为提高化学实验和生产效率以及降低成本做出了巨大贡献。其影响在新材料开发和药物发现方面尤为明显。然而，在化学领域实施人工智能会遇到许多障碍，包括数据质量不高、模型可解释性有限以及数据隐私问题。要解决这些问题，科技界必须促进多学科合作，开发更全面、更实用的人工智能框架，并研究更安全的数据安全技术。未来，随着人工智能的不断进步，人工智能与化学研究之间的关系将变得更加可靠和密切。这将提高化学研究的效率、安全性和成本效益，开创化学领域的新时代。

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引用次数: 0

Unlocking Co3O4–ZnO p-n heterojunction for superior acetone gas sensing detection 揭开 Co3O4-ZnO p-n 异质结的神秘面纱，实现卓越的丙酮气体传感检测功能

IF 4.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International

Pub Date : 2024-10-01 DOI: 10.1016/j.pnsc.2024.07.014

Xingxing Liu , Tingting Shao , Juntang Dong , Huirong Kou , Fuchun Zhang , Yuyang Cheng , Jiaming Guo , Shuwei Tian , Kuldeep K. Saxena , Xinghui Liu

In this study, we synthesized pure ZnO and Co₃O₄–ZnO precursors with varied Co, Zn ratios via solvothermal method, and then the precursors were calcined at 400 °C for 2 h in a muffle furnace under air to obtain composites for acetone detection. The structure, morphology, elemental composition, microstructure and chemical state of these materials were systematically studied by various characterization techniques. Additionally, we also evaluated the gas sensing performance of the composites-based sensors, focusing on optimal operating temperature, baseline resistance, repeatability, stability, selectivity, response/recovery time, and resistance under varying relative humidity. The findings reveal that 3 % Co₃O₄–ZnO-based sensor exhibit the highest response value to 100 ppm acetone (74), showing an enhancement of approximately 9.3 times compared to the pure ZnO-based sensor (8). Furthermore, the 3 % Co₃O₄–ZnO-based sensor demonstrate the advantages of rapid response/recovery times (15 s/2 s), outstanding selectivity, and remarkable stability. The gas sensing mechanism of the composite material is also discussed in detail, which provides insights into the observed enhancement of gas sensing performance. It provides an idea for the follow-up study on gas sensing performance of acetone sensors.

在本研究中，我们通过溶热法合成了纯 ZnO 和不同 Co、Zn 比例的 Co3O4-ZnO 前驱体，然后在马弗炉中于空气中于 400 °C 煅烧 2 小时，得到了用于丙酮检测的复合材料。我们利用各种表征技术系统地研究了这些材料的结构、形态、元素组成、微观结构和化学状态。此外，我们还评估了基于复合材料的传感器的气体传感性能，重点是最佳工作温度、基线电阻、重复性、稳定性、选择性、响应/恢复时间以及在不同相对湿度下的电阻。研究结果表明，3 % Co3O4-ZnO 基传感器对 100 ppm 丙酮 (74) 的响应值最高，与纯 ZnO 基传感器 (8) 相比提高了约 9.3 倍。此外，3 % Co3O4-ZnO 基传感器还具有快速响应/恢复时间（15 秒/2 秒）、出色的选择性和显著的稳定性等优点。本文还详细讨论了复合材料的气体传感机理，为观察到的气体传感性能增强提供了启示。这为丙酮传感器气体传感性能的后续研究提供了思路。

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引用次数: 0

Investigation into the stress‒strain compatibility and fracture behaviour of a TC18 titanium alloy with a multistage lamellar microstructure 具有多级片状微结构的 TC18 钛合金的应力-应变兼容性和断裂行为研究

IF 4.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International

Pub Date : 2024-10-01 DOI: 10.1016/j.pnsc.2024.07.020

Zhongxiang Li , Zhaoxin Du , Jun Cheng , Zhiyong Yue , Tianhao Gong , Xudong Kang , Yongcheng Zhu

Understanding the fracture mechanism is essential for optimizing the mechanical properties of titanium alloys. The relationship between fracture behaviour and the multistage lamellar microstructure of the TC18 (Ti–5Al–5Mo–5V–1Cr–1Fe) alloy was investigated via in situ tensile and three-point bending tests. The results indicate that the TC18 alloy, featuring a multistage lamellar microstructure (including a β matrix, primary lamellar α phase, bundles, and secondary lamellar α phase), exhibits an excellent combination of strength and ductility. The precipitation of the secondary lamellar α phase significantly enhances the alloy's strength but weakens the stress‒strain compatibility of the microstructure. This results in a smaller crack-tip plastic zone (CTPZ) and causes dislocations to concentrate more at the grain boundaries and, to a lesser extent, at the phase interfaces. Consequently, in the later stages of crack propagation, microvoids and microcracks tend to form at dislocation pile-ups. With increasing stress, these microvoids and microcracks rapidly coalesce, leading to a greater proportion of intergranular fracture and thus reducing the fracture toughness of the alloy.

了解断裂机制对于优化钛合金的机械性能至关重要。通过原位拉伸和三点弯曲试验，研究了 TC18（Ti-5Al-5Mo-5V-1Cr-1Fe）合金的断裂行为与多级片状微结构之间的关系。结果表明，TC18 合金具有多级层状微结构（包括 β 基体、初级层状 α 相、束和次级层状 α 相），在强度和延展性方面表现出优异的组合。次生层状 α 相的析出大大提高了合金的强度，但却削弱了微结构的应力-应变相容性。这导致裂纹尖端塑性区（CTPZ）变小，并使位错更多地集中在晶界，其次是相界面。因此，在裂纹扩展的后期阶段，微空洞和微裂纹往往会在位错堆积处形成。随着应力的增加，这些微空洞和微裂纹会迅速凝聚，导致更大比例的晶间断裂，从而降低合金的断裂韧性。

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引用次数: 0

Hot deformation behavior and dynamic recrystallization of 2195 Al–Li alloy with various pre-precipitation microstructures 具有不同预沉积微观结构的 2195 Al-Li 合金的热变形行为和动态再结晶

IF 4.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International

Pub Date : 2024-10-01 DOI: 10.1016/j.pnsc.2024.07.003

Rong Fu , Hongbang Shao , Yuanchun Huang , Yu Liu , Hui Li

In this work, 2195 Al–Li alloys with various precipitation microstructures were obtained by homogenization treatment followed by air-cooling (AC), discontinuous cooling (DC), and furnace-cooling (FC), and then tested by hot compression at different temperatures. The results show that the flow stresses of all specimens decrease with temperature and the peak stresses of AC, DC and FC specimens decrease in order at the same temperature. For FC samples, coarse pre-precipitates diminish the deformation resistance due to the reduction of solid solution strengthening and precipitation strengthening. Dynamic softening at low temperatures is significantly greater than that at high temperatures, except for the anomalous softening of the FC specimen at 520 °C due to stress release by cracks. At 370–420 °C, the dynamic softening of the AC specimen is more significant than the other samples, resulting from dynamic precipitation and precipitate coarsening. Furthermore, there is considerable dynamic recrystallization (DRX) in FC samples and not in AC and DC samples, although their precipitates coarsen to similar levels at low temperatures. This suggests that DRX is associated with the particle-stimulated nucleation mechanism by regularly arranged precipitates. The banded or regularly arranged precipitates divide the Al matrix into multiple confined units, hindering dislocations and (sub)grain boundary movement, and thus promoting the development of sub-grains and DRX.

在这项研究中，2195 种具有不同析出微观结构的 Al-Li 合金经均匀化处理后分别进行了空气冷却 (AC)、间断冷却 (DC) 和炉冷 (FC)，然后在不同温度下进行了热压试验。结果表明，所有试样的流动应力都随温度升高而降低，在相同温度下，AC、DC 和 FC 试样的峰值应力依次降低。对于 FC 试样，由于固溶强化和沉淀强化作用的减弱，粗大的预沉淀物降低了抗变形能力。除了 FC 试样在 520 °C 时由于裂纹释放应力而出现异常软化外，低温下的动态软化明显大于高温下的动态软化。在 370-420 °C时，AC试样的动态软化比其他试样更明显，这是由于动态沉淀和沉淀粗化造成的。此外，在 FC 样品中存在大量的动态再结晶（DRX），而在 AC 和 DC 样品中则没有，尽管它们的析出物在低温下的粗化程度相似。这表明 DRX 与规则排列的沉淀物的颗粒刺激成核机制有关。带状或规则排列的沉淀物将铝基体分成多个封闭单元，阻碍了位错和（亚）晶界运动，从而促进了亚晶粒和 DRX 的形成。

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引用次数: 0

Insight into element segregation mechanisms during creep in γʹ-strengthened Co-based superalloy by elastoplastic phase-field simulation 通过弹塑性相场模拟深入了解γʹ强化钴基超合金蠕变过程中的元素偏析机制

IF 4.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International

Pub Date : 2024-10-01 DOI: 10.1016/j.pnsc.2024.05.013

Jia Chen, Min Guo, Min Yang, Tingting Cui, Borong Cui, Jun Zhang

The element segregation accompanying the creep process has been shown to significantly affect the deformation resistance of the superalloys. However, the processing and mechanism of element segregation are still unclear. This paper investigated the concentration evolution of a model Co–9Al–9W (at. %) alloy during 900 °C/275 MPa using developed ternary elastoplastic phase-field model coupled with CALPHAD method and crystal plasticity model. The results of simulation show that co-depletion of Al and W element occurs in γʹ precipitate and in γ side at γ/γʹ interface, and this depletion is gradually increasing with the accumulation of plastic strain. From the perspective of changes of driving force of element diffusion, it is found that these segregation phenomena are attributed to the high elastic potential caused by the large local plastic strain. In addition, the effects of these segregations on creep property are also predicted. The current research provides a new method for exploring the mechanism of element diffusion.

蠕变过程中的元素偏析已被证明会严重影响超合金的抗变形能力。然而，元素偏析的加工过程和机理仍不清楚。本文使用开发的三元弹塑性相场模型，结合 CALPHAD 方法和晶体塑性模型，研究了模型 Co-9Al-9W (at. %) 合金在 900 °C/275 MPa 时的浓度演变。模拟结果表明，在γʹ沉淀和γ/γʹ界面的γ侧发生了铝元素和 W 元素的共耗损，并且这种耗损随着塑性应变的积累而逐渐增加。从元素扩散驱动力变化的角度看，这些偏析现象是由于局部塑性应变大而产生的高弹性势能造成的。此外，还预测了这些偏析对蠕变特性的影响。目前的研究为探索元素扩散机理提供了一种新方法。

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引用次数: 0