Materials Science and Engineering: A最新文献_第7页

Centrifugal directional freezing and pressure infiltration: Tailoring gradient structures and mechanical properties in Al/B4C composites 离心定向冻结和压力渗透：定制 Al/B4C 复合材料的梯度结构和机械性能

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2024-10-29 DOI: 10.1016/j.msea.2024.147471

Yu-Bai Hu , Chuan-Zeng Wang , Shuai-Shuai Li, Ping Shen

Inspired by the gradient structures found in natural materials like bone, this study presents a novel fabrication method combining centrifugal freeze casting and pressure infiltration to produce Al/B₄C composites with a tunable gradient layered structure, effectively addressing the challenge of achieving both high strength and toughness in metal-matrix composites. By precisely controlling key parameters such as centrifugal speed, ceramic content, particle size distribution, and freezing temperature, we achieved a gradient transition from high hardness and strength in the outer layers to lower hardness and higher toughness in the inner layers, mimicking the performance characteristics of natural materials. Specifically, higher centrifugal speeds and multi-sized ceramic particles promoted a more pronounced gradient structure, with larger particles concentrating in the outer regions for enhanced strength. While increasing ceramic content improved overall strength, it also affected toughness, highlighting the need for optimization. Freezing temperature influenced the ice-crystal structure and interlayer ceramic bridging, impacting both the gradient and overall composite properties. The optimized composites exhibited a unique combination of low density, high strength, and exceptional fracture toughness, primarily attributed to strong interfacial bonding, effective crack deflection and metal bridging, and formation of an interpenetrating structure. This study provides a versatile, cost-effective and scalable pathway for fabricating bioinspired high-performance metal–ceramic composites.

受骨骼等天然材料中梯度结构的启发，本研究提出了一种结合离心冷冻铸造和压力渗透的新型制造方法，用于制造具有可调梯度分层结构的铝/B4C 复合材料，从而有效地解决了金属基复合材料同时具有高强度和高韧性的难题。通过精确控制离心速度、陶瓷含量、粒度分布和冷冻温度等关键参数，我们实现了从外层的高硬度和高强度到内层的低硬度和高韧性的梯度过渡，模拟了天然材料的性能特征。具体来说，较高的离心速度和多尺寸陶瓷颗粒促进了更明显的梯度结构，较大的颗粒集中在外层区域，从而增强了强度。虽然陶瓷含量的增加提高了整体强度，但也影响了韧性，因此需要进行优化。冷冻温度会影响冰晶结构和层间陶瓷桥接，从而影响梯度和整体复合材料性能。优化后的复合材料表现出低密度、高强度和优异断裂韧性的独特组合，这主要归功于强大的界面结合、有效的裂纹偏转和金属桥接以及互穿结构的形成。这项研究为制造受生物启发的高性能金属陶瓷复合材料提供了一种通用、经济、可扩展的途径。

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引用次数: 0

The effect of interfacial alloy formation on the mechanical properties of the additively manufactured Ti6Al4V/Ti1Al8V5Fe microstructurally graded material 界面合金形成对添加式制造的 Ti6Al4V/Ti1Al8V5Fe 微结构分级材料机械性能的影响

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2024-10-29 DOI: 10.1016/j.msea.2024.147484

Alexander E. Medvedev, Shenglu Lu, Ma Qian, Milan Brandt

Multi-material (MM) structures have been shown in the past to be potential candidates for future high performance high strain rate applications. With the advancement of MM additive manufacturing (AM), there is a renewed push to explore the vast array of materials combinations to deliver advanced protective capabilities. At the same time, many fundamental issues are still plaguing MM assemblies, primarily linked to the often-poor quality of the MM interface. Here, we present a novel approach to obtain microstructural and mechanical properties gradient without interface defects by leveraging the link between the chemical composition and complex grain/phase morphology in titanium alloys. We used additive manufacturing (AM) to combine α+β-titanium alloy Ti6Al4V with metastable β-titanium alloy Ti1Al8V5Fe (which belong to different alloy classes but share common alloying elements), into a microstructurally graded material (MGM). Uniquely, the classic MM interface was replaced by the two additional intermixed alloy layers with unique chemical composition, microstructure and mechanical properties, with both ultimately making a significant contribution to the overall performance. The properties of these interface alloys are affected by many factors, such as thermal properties of the substrate, process parameters, alloying element distribution and post-manufacturing heat treatment. As a result, we showed that a superior combination of the strength and ductility could be achieved in the hybrid material after heat treatment compared to the original materials or the as-built hybrid material, which was ultimately attributed to the formation of the interface alloys. The presented approach is not limited to titanium alloys and could be extended to other materials systems and is expected to contribute to the development of a deeper understanding of the intermixing phenomena and its effects on microstructure and mechanical performance of MGMs, opening the door to a range of unique solutions in alloy and MM structural design for high performance applications.

过去的研究表明，多材料（MM）结构是未来高性能、高应变率应用的潜在候选材料。随着多材料增材制造（AM）技术的发展，人们再次推动探索各种材料组合，以提供先进的保护能力。与此同时，许多基本问题仍然困扰着 MM 组件，这主要与 MM 接口质量不佳有关。在此，我们提出了一种新方法，利用钛合金中化学成分与复杂晶粒/相形态之间的联系，获得无界面缺陷的微结构和机械性能梯度。我们利用增材制造（AM）技术将α+β-钛合金 Ti6Al4V 与易变β-钛合金 Ti1Al8V5Fe（它们属于不同的合金类别，但具有共同的合金元素）结合成微结构梯度材料（MGM）。与众不同的是，传统的 MGM 界面被另外两个具有独特化学成分、微观结构和机械性能的混合合金层所取代，这两个合金层最终都对整体性能做出了重大贡献。这些界面合金的性能受到许多因素的影响，如基体的热性能、工艺参数、合金元素分布和制造后的热处理。结果表明，与原始材料或制造后的混合材料相比，热处理后的混合材料可以获得更高的强度和延展性组合，这最终归功于界面合金的形成。所介绍的方法并不局限于钛合金，还可扩展到其他材料体系，预计将有助于加深对混杂现象及其对 MGM 微观结构和机械性能影响的理解，为高性能应用领域的合金和 MM 结构设计提供一系列独特的解决方案。

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引用次数: 0

Enhanced strength of N-doped NiCoCr medium-entropy alloy produced by plasma arc melting in nitrogen atmosphere 在氮气环境中通过等离子弧熔炼提高掺 N 镍钴铬中熵合金的强度

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2024-10-28 DOI: 10.1016/j.msea.2024.147474

Ying Dong , Hainan Zhang , Yifan Zhang , Jianbo Yu , Xiaoxin Zhang , Zhigang Yang , Tao Hu , Zhongming Ren

Nitrogen doping is an effective method to enhance the mechanical properties of medium-entropy alloys (MEAs). However, some nitride inclusions may be formed during nitrogen process of alloys, which is detrimental to their properties. Therefore, a method that maximizes nitrogen content in alloys without forming nitride inclusions is urgently needed. In this study, a novel nitriding technology, nitrogen plasma arc melting, was introduced for the first time to prepare N-doped NiCoCr alloys. This study focused on the impact of nitrogen atom interstitial doping on the microstructure and plastic deformation of NiCoCr alloys. Results demonstrated that a remarkably high concentration of nitrogen (up to 0.27 wt%) was dissolved in the matrix without forming any nitride inclusions. The tensile strength of the nitrogen-doped NiCoCrN_0.27 alloy reached 1325 MPa, and the average grain size was 14 μm. Calculation results of density functional theory (DFT) revealed that N atoms exclusively occupied the octahedral interstitial sites, particularly those with higher concentrations of Cr atoms. N atoms formed the localized short-range ordered (SRO) structures with surrounding Cr atoms, creating strong ionic bonds among adjacent metal atoms. This SRO structure, with N atoms at the center, effectively facilitated the dislocation storage and increased the lattice friction, which were crucial for improving the alloy's strength. However, the presence of N atoms in octahedral interstitial sites increased the stacking fault energy of the {111}<101> slip system, leading to a significant decrease in ductility. Interstitial doping of N atoms in NiCoCr alloys could significantly enhance the alloy's strength through multiple strengthening mechanisms.

掺氮是提高中熵合金（MEA）机械性能的有效方法。然而，在合金的掺氮过程中可能会形成一些氮化物夹杂物，这对合金的性能不利。因此，迫切需要一种既能最大限度地提高合金中的氮含量，又不会形成氮化物夹杂物的方法。本研究首次引入了氮等离子弧熔化这一新型氮化技术来制备掺氮的镍铬合金。研究重点是氮原子间隙掺杂对镍钴铬合金微观结构和塑性变形的影响。结果表明，基体中溶解的氮浓度非常高（高达 0.27 wt%），且未形成任何氮化物夹杂物。掺氮 NiCoCrN0.27 合金的抗拉强度达到 1325 兆帕，平均晶粒尺寸为 14 微米。密度泛函理论（DFT）的计算结果显示，氮原子完全占据了八面体间隙位点，尤其是那些含有较高浓度铬原子的位点。N 原子与周围的 Cr 原子形成了局部短程有序（SRO）结构，在相邻金属原子之间形成了强离子键。这种以 N 原子为中心的 SRO 结构有效地促进了位错存储并增加了晶格摩擦，这对提高合金强度至关重要。然而，八面体间隙位点中 N 原子的存在增加了{111}<101>滑移体系的堆积断层能，导致延展性显著下降。在镍钴铬合金中间隙掺杂 N 原子可通过多种强化机制显著提高合金的强度。

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引用次数: 0

Tuning of the mechanical properties of a laser powder bed fused eutectic high entropy alloy Ni30Co30Cr10Fe10Al18W2 through heat treatment 通过热处理调节激光粉末床熔融共晶高熵合金 Ni30Co30Cr10Fe10Al18W2 的机械性能

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2024-10-28 DOI: 10.1016/j.msea.2024.147469

Yiwei Yu , Yakai Zhao , Kai Feng , Rong Chen , Bolun Han , Kaifeng Ji , Meng Qin , Zhuguo Li , Upadrasta Ramamurty

Eutectic high entropy alloys (EHEA) with an exceptional combination of strength and ductility are promising candidates as advanced structural materials. However, achieving an optimal balance between the properties in additively manufactured EHEAs is an outstanding challenge. In this work, Ni₃₀Co₃₀Cr₁₀Fe₁₀Al₁₈W₂ EHEA was additively manufactured using the laser powder bed fusion (LPBF) technique. In the as-fabricated state, it exhibits a dual-phase nano-lamellar structure consisting of FCC/L1₂ and B2 phases. Post-fabrication heat treatments were explored for modulating microstructure and, in turn, enhancing the mechanical properties, so as to achieve an optimum balance between strength and ductility. Upon heat treatment at 750 °C for 1 h, part of the B2 phase transformed into FCC, with the appearance of the tungsten-rich precipitates inside the B2 phase. The average interlayer spacing of the FCC/L1₂ lamellae increased to 124 nm, while that of B2 lamellae decreased to 86 nm, resulting in an alloy with an ultimate tensile strength (UTS) of 1811 MPa, although the strain to failure (ε_f) decreased to 2 %. Upon increasing the heat treatment temperature to 1000 °C, the average interlayer spacings of the FCC and B2 phases increased to 210 and 187 nm, respectively, which resulted in a more balanced mechanical behavior with UTS and ε_f of 1332 MPa and 9.3 %, respectively. This study provides an effective approach for microstructural modulation and enhancement of mechanical properties of LPBF fabricated EHEA via post-fabrication heat treatment, offering insights for developing future high-performance alloys for advanced structural applications.

共晶高熵合金（EHEA）兼具优异的强度和延展性，有望成为先进的结构材料。然而，如何在添加制造的 EHEA 中实现性能之间的最佳平衡是一项艰巨的挑战。在这项工作中，采用激光粉末床熔融（LPBF）技术添加制造了 Ni30Co30Cr10Fe10Al18W2 EHEA。在制造状态下，它呈现出由 FCC/L12 和 B2 相组成的双相纳米层状结构。为了在强度和延展性之间达到最佳平衡，研究人员探索了制造后的热处理方法，以调节微观结构，进而提高机械性能。在 750 °C 下热处理 1 小时后，部分 B2 相转变为 FCC，B2 相内部出现了富钨沉淀。FCC/L12 片层的平均层间距增至 124 nm，而 B2 片层的平均层间距降至 86 nm，从而使合金的极限抗拉强度 (UTS) 达到 1811 MPa，但破坏应变 (εf)降至 2%。当热处理温度升高到 1000 ℃ 时，FCC 相和 B2 相的平均层间距分别增加到 210 nm 和 187 nm，从而使合金的力学性能更加均衡，其 UTS 和 εf 分别达到 1332 MPa 和 9.3 %。这项研究为通过制造后热处理调节 LPBF 制成的 EHEA 的微结构和提高其力学性能提供了一种有效的方法，为开发未来先进结构应用的高性能合金提供了启示。

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引用次数: 0

Simultaneously enhancing strength, ductility, and electrical conductivity in Cu-1Cr-0.1Zr alloy by heterogeneous microstructure 通过异质微观结构同时提高 Cu-1Cr-0.1Zr 合金的强度、延展性和导电性

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2024-10-28 DOI: 10.1016/j.msea.2024.147473

Zhu Qi Chu , Zhen Fan , Wei Wei , Kun Xia Wei , Igor V. Alexandrov , Xu Long An , Dan Dan Wang , Xiang Kui Liu

A novel layered heterogeneous microstructure, exhibiting a multiscale distribution of grain sizes and structural features, including nanocrystalline (NC), nanotwins (NT), nanoscale precipitates (NP), submicron crystalline (SC) and microcrystalline (MC), was successfully fabricated within the Cu-1Cr-0.1Zr alloy via solid solution (SS) treatment, aging treatment (AT), cold rolling (CR), and annealing treatment. The heterogeneous microstructure of the Cu-1Cr-0.1Zr alloy exhibits excellent strength, ductility, and electrical conductivity, mainly due to the synergistic effects between multi-scale grains formed during deformation, leading to significant hetero-deformation induced (HDI) stress and the Bauschinger effect, which simultaneously improves strength and ductility. Interestingly, annealing treatment to form recrystallized grain, SC and MC can improve electrical conductivity. This study provides an effective way to achieve synergistic effects between significant strength, good ductility, and remarkable electrical conductivity in copper alloys.

通过固溶（SS）处理、时效处理（AT）、冷轧（CR）和退火处理，成功地在 Cu-1Cr-0.1Zr 合金中制造出了一种新型的分层异质微观结构，它呈现出晶粒大小和结构特征的多尺度分布，包括纳米晶（NC）、纳米孪晶（NT）、纳米级沉淀（NP）、亚微米晶（SC）和微晶（MC）。Cu-1Cr-0.1Zr 合金的异质微观结构具有优异的强度、延展性和导电性，这主要是由于在变形过程中形成的多尺度晶粒之间的协同效应，导致显著的异质变形诱导应力（HDI）和鲍辛格效应，从而同时提高了强度和延展性。有趣的是，通过退火处理形成再结晶晶粒、SC 和 MC 可以提高导电性。这项研究为在铜合金中实现显著的强度、良好的延展性和出色的导电性之间的协同效应提供了有效途径。

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引用次数: 0

Design and investigation of strength-ductility TiAl matrix composites with a novel dual-layers couple reinforced structure 设计和研究具有新型双层耦合增强结构的强度-电导率 TiAl 基复合材料

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2024-10-28 DOI: 10.1016/j.msea.2024.147482

Weigang Yang , Mingao Li , Shulong Xiao , Yuyong Chen

TiAl matrix composites with a novel dual-layers couple reinforced structure have been designed and successfully prepared by the combination of plasma rotating electrode process (PREP) and spark plasma sintering (SPS) in this study. The dual-layers reinforced TiAl composites consisted of the fully lamellar TiAl matrix units that were reinforced by dispersed carbides and the outer reinforced network structures that were composed of TiB and Ti₂AlC. The growth mechanisms of TiB and Ti₂AlC in the outer network reinforced structures have been revealed. The orientation relationships were indicated as (0001)[11–20]_Ti2AlC||(111)[10-1]_TiAl, [011]_TiB||[210]_TiAl and [-100]_TiB||[11–20]_Ti2AlC. The introduction of dual-layers couple reinforced structures significantly enhanced the ultimate tensile strength (UTS) at 900 °C and the elongation at room temperature (RT). Especially, the composites with 0.5 wt% B₄C addition represented the UTS and elongation as 424.36MPa/1.42 % at RT and 497.32MPa/4.12 % at 900 °C. The growths of outer network reinforced structures enhanced the connectivity of adjacent TiAl matrix units, and triggered off the transformation of fracture modes from intergranular to translamellar. Additionally, the plastic deformation of TiAl matrix composites mainly stemmed from γ phase and refined lamellae. The fractures usually propagated along the (101)_TiB and (100)_TiB planes in TiB crystals during the loading. Dislocations pile-ups led to the activation of slipping along the (0001)_Ti2AlC in carbides, especially at high temperatures. The dual-layers couple reinforced structures resulted in the coordination of strengthening and toughening within TiAl matrix units and the interfaces, which contributed to the balance between the UTS at 900 °C and the elongation at RT of the composites.

本研究结合等离子旋转电极工艺（PREP）和火花等离子烧结工艺（SPS），设计并成功制备了具有新型双层耦合增强结构的 TiAl 基复合材料。双层增强 TiAl 复合材料由分散碳化物增强的全片状 TiAl 基体单元和由 TiB 和 Ti2AlC 组成的外层增强网络结构组成。研究揭示了外层网络增强结构中 TiB 和 Ti2AlC 的生长机制。其取向关系为(0001)[11-20]Ti2AlC||(111)[10-1]TiAl、[011]TiB||[210]TiAl 和 [-100]TiB||[11-20]Ti2AlC 。双层耦合增强结构的引入显著提高了 900 °C 下的极限拉伸强度（UTS）和室温下的伸长率（RT）。特别是添加了 0.5 wt% B4C 的复合材料，其室温下的极限拉伸强度和伸长率分别为 424.36MPa/1.42%和 497.32MPa/4.12%。外层网状增强结构的生长增强了相邻 TiAl 基体单元的连通性，并引发了断裂模式从晶粒间断裂到易位断裂的转变。此外，TiAl 基复合材料的塑性变形主要源于 γ 相和细化薄片。在加载过程中，断裂通常沿着 TiB 晶体中的 (101)TiB 和 (100)TiB 平面传播。位错堆积导致碳化物中的(0001)Ti2AlC沿滑动方向活化，尤其是在高温下。双层耦合增强结构使 TiAl 基体单元和界面内的强化和韧化相互协调，从而使复合材料在 900 °C 时的 UTS 和 RT 时的伸长率达到平衡。

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引用次数: 0

Data-driven inverse design of MoNbTiVWZr refractory multicomponent alloys: Microstructure and mechanical properties 数据驱动的 MoNbTiVWZr 难熔多组分合金反设计：微观结构和机械性能

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2024-10-28 DOI: 10.1016/j.msea.2024.147475

Lavanya Raman , Arindam Debnath , Erik Furton , Shuang Lin , Adam Krajewski , Subrata Ghosh , Na Liu , Marcia Ahn , Bed Poudel , Shunli Shang , Shashank Priya , Zi-Kui Liu , Allison M. Beese , Wesley Reinhart , Wenjie Li

Multicomponent refractory alloys have the potential to operate in high-temperature environments. Alloys with heterogeneous/composite microstructure exhibit an optimal combination of high strength and ductility. The present work generates designed compositions using high-throughput computational and machine-learning (ML) models based on elements Mo-Nb-Ti-V-W-Zr manufactured utilizing vacuum arc melting. The experimentally observed phases were consistent with CALPHAD and Scheil simulations. ML models were used to predict the room temperature mechanical properties of the alloy and were validated with experimental mechanical data obtained from the three-point bending and compression tests. This work collectively showcases a data-driven, inverse design methodology that can effectively identify new promising multicomponent refractory alloys.

多组分耐火合金具有在高温环境中工作的潜力。具有异质/复合微观结构的合金展现了高强度和延展性的最佳组合。本研究以利用真空电弧熔炼制造的 Mo-Nb-Ti-V-W-Zr 元素为基础，利用高通量计算和机器学习（ML）模型生成设计成分。实验观察到的相位与 CALPHAD 和 Scheil 模拟一致。ML 模型用于预测合金的室温力学性能，并与三点弯曲和压缩试验获得的实验力学数据进行了验证。这项工作共同展示了一种数据驱动的逆向设计方法，该方法可以有效地识别新的有前途的多组分耐火合金。

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引用次数: 0

Deformation mechanisms of the Cu-15Ni-8Sn-0.18Nb alloy in as-quenched and aged conditions Cu-15Ni-8Sn-0.18Nb 合金在淬火和时效条件下的变形机制

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2024-10-28 DOI: 10.1016/j.msea.2024.147477

Meichen Hu , Chaoqiang Liu , Xianwei Zhang , Houwen Chen , Xueping Gan

The Cu-15Ni-8Sn (wt%) based alloys exhibit an excellent combination of strength, stress-relaxation resistance and corrosion-resistance properties, and have become an important material widely used in aerospace, ocean and mining industries. So far, the mechanical behaviors of the alloys have not been understood, which limits the effective regulation of the mechanical properties of the alloys. To improve understanding of deformation mechanisms responsible for its mechanical properties, tensile tests were performed at room temperature and interrupted at the special strains to acquire deformation microstructures, and the deformation microstructures are characterized by electron backscattered diffraction and transmission electron microscopy. In contrast to pure copper in which dislocation slipping dominates the plastic deformation, the results indicate that the mainly deformation mechanism of the as-quenched Cu-15Ni-8Sn-0.18Nb alloy includes deformation twinning, dislocations slipping and generation of stacking faults (SFs), while deformation twins are inhibited in the aged sample, and dislocations and SFs dominate the deformation microstructure. The reasons for the change of deformation mechanism are due to the different stacking fault energy in the as-quenched and aged samples and the hindering effect of nanoscale precipitates to twinning in the aged sample.

基于 Cu-15Ni-8Sn (wt%) 的合金具有出色的强度、抗应力松弛和耐腐蚀性能，已成为广泛应用于航空航天、海洋和采矿业的重要材料。迄今为止，人们对合金的力学行为还不甚了解，这限制了对合金力学性能的有效调节。为了更好地了解导致其机械性能的变形机制，我们在室温下进行了拉伸试验，并在特殊应变下中断拉伸试验，以获得变形微结构，并通过电子反向散射衍射和透射电子显微镜对变形微结构进行表征。与位错滑动主导塑性变形的纯铜相比，结果表明，淬火后的 Cu-15Ni-8Sn-0.18Nb 合金的主要变形机制包括变形孪晶、位错滑动和堆积断层（SFs）的产生，而在老化样品中，变形孪晶受到抑制，位错和 SFs 主导变形微观结构。变形机制变化的原因是淬火后样品和老化后样品的堆叠断层能量不同，以及老化后样品中纳米级析出物对孪晶的阻碍作用。

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引用次数: 0

Massive Mo alloying for enhancing resistance to hydrogen-induced crack propagation in medium-entropy CoNiMo alloy 大规模钼合金化增强中熵 CoNiMo 合金抗氢致裂纹扩展的能力

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2024-10-28 DOI: 10.1016/j.msea.2024.147476

Dae Cheol Yang , Ju-Hyun Baek , Sang Yoon Song , Tae Jin Jang , Alireza Zargaran , Young Kyun Kim , Jin-Yoo Suh , Hong Luo , Young Sang Na , Seok Su Sohn

There has been a consistent demand for an alloy design strategy that concurrently enhances both strength and resistance to hydrogen embrittlement (HE). The element Mo is recognized for inducing both lattice distortion and grain boundary strengthening effects, which can simultaneously increase strength and resistance to HE. Accordingly, this study investigates face-centered cubic (FCC) single-phase CoNi and CoNiMo alloys as model systems to unravel the effect of the substantial addition of Mo on resistance to HE. Hydrogen-induced crack propagation behaviors were systematically analyzed using an interrupted tensile test. In the Mo-added alloy, crack propagation increases in width rather than depth, indicating considerable resistance to crack advancement. This reduction of crack propagation rate is attributed to the rapid crack advancement into ductile regions and the activation of deformation twinning near the crack. These phenomena result from the substantial Mo alloying effect, which inhibits hydrogen trapping on grain boundaries, lowers stacking fault energy to facilitate twin formation, and ultimately suppresses plastic instability. Consequently, the addition of Mo into an FCC alloy offers a potential approach for enhancing the strength without significant loss of HE resistance. This strategy presents a viable design approach for developing high-strength FCC single-phase alloy while marginally compromising HE resistance.

一直以来，人们都需要一种能同时提高强度和抗氢脆（HE）能力的合金设计策略。钼元素被认为可诱导晶格畸变和晶界强化效应，从而同时提高强度和抗氢脆能力。因此，本研究将面心立方（FCC）单相 CoNi 和 CoNiMo 合金作为模型系统进行研究，以揭示大量添加 Mo 对抗 HE 性能的影响。利用间断拉伸试验系统分析了氢诱导的裂纹扩展行为。在添加了钼的合金中，裂纹扩展的宽度增加而不是深度增加，这表明裂纹前进的阻力相当大。裂纹扩展速率的降低归因于裂纹快速扩展到韧性区域以及裂纹附近变形孪生的激活。这些现象源于大量的钼合金化效应，它抑制了晶界上的氢捕集，降低了堆叠断层能以促进孪晶的形成，并最终抑制了塑性不稳定性。因此，在 FCC 合金中添加 Mo 提供了一种潜在的方法，可在不显著降低抗 HE 性能的情况下提高强度。这种策略为开发高强度 FCC 单相合金提供了一种可行的设计方法，同时又能在一定程度上降低抗 HE 性能。

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引用次数: 0

New insights into physical origins of dynamic strain aging in Ti-2Al-2.5Zr alloy and influence on LCF and HCF behaviors 关于 Ti-2Al-2.5Zr 合金动态应变时效的物理起源及其对 LCF 和 HCF 行为影响的新见解

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2024-10-28 DOI: 10.1016/j.msea.2024.147483

Jingtai Yu , Bingbing Li , Mengqi Li , Shengkun Wang , Xiang Guo , Jun Wu , Gang Chen

The multi-step strain aging tests were meticulously designed in this work to reveal the physical mechanisms of static strain aging (SSA) and dynamic strain aging (DSA) behaviors in Ti-2Al-2.5Zr alloy for the first time. It was revealed that the shuffling mechanism of interstitial oxygen atoms combined with the pinning effect of locally-generated cross-slip on the movement of screw dislocations were responsible for the occurrence of strain aging. Furthermore, the effects of DSA on the low-cycle fatigue (LCF) and high-cycle fatigue (HCF) properties were elucidated in Ti-2Al-2.5Zr alloy. Results showed that the sensitivity of DSA to cyclic loading was attributed to the generation of numerous residual edge dislocation segments through local cross-slip, facilitating the formation of dislocation veins which inhibited the formation of persistent slip bands (PSBs) and led to the significantly cyclic hardening. Finally, it was emphasized that the phenomenon of DSA should be carefully considered for the structural integrity assessment of Ti-2Al-2.5Zr alloy and several suggestions were provided.

该研究精心设计了多步应变时效试验，首次揭示了Ti-2Al-2.5Zr合金静态应变时效（SSA）和动态应变时效（DSA）行为的物理机制。研究发现，间隙氧原子的洗牌机制与局部产生的交叉滑移对螺位错运动的钉扎效应是导致应变时效发生的原因。此外，还阐明了 DSA 对 Ti-2Al-2.5Zr 合金的低循环疲劳 (LCF) 和高循环疲劳 (HCF) 性能的影响。结果表明，DSA 对循环加载的敏感性归因于通过局部交叉滑移产生了大量残余边缘位错段，促进了位错脉的形成，从而抑制了持久滑移带（PSB）的形成，并导致了显著的循环硬化。最后，研究人员强调在评估 Ti-2Al-2.5Zr 合金的结构完整性时应仔细考虑 DSA 现象，并提出了若干建议。

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