Materials Science and Engineering: A最新文献_第6页

Effect of Yttrium addition on microstructural evolution and mechanical performance of in-situ Al-6061/ZrB2 composites 添加钇对原位Al-6061/ZrB2复合材料显微组织演变及力学性能的影响

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-12-01 DOI: 10.1016/j.msea.2025.149538

Sami Ullah Khan , Vignesh Babu Rajendren , Farooq Ahmad , Sajjad Emami , Hanif Ullah , Xizhou Kai , Yutao Zhao

Al-6061 reinforced with nanoparticles has superior strength, stiffness, and resistance to wear and creep compare to the unreinforced 6061 aluminum alloy, which makes it ideal for application in automobile components and aviation structures. The composites were fabricated through an in-situ reaction, including two potassium salts, K₂ZrF₆ and KBF₄, which were introduced in the appropriate stoichiometric ratio to generate ZrB₂ in the Al-6061 alloy melt at 850 °C, producing Al-6061-3 wt.% ZrB₂ composite with Y (0.1 wt.% & 0.3 wt.%) followed by T6 heat treatment. The effect of varying concentration of Yttrium (Y) and T6 treatment on microstructural and mechanical behaviour of Al-6061 alloy composites with homogenously dispersed Zirconium diboride (ZrB₂) nanoparticles was investigated. The T6 heat treatment and 0.3 wt.% Y, could simultaneously optimize the second dendritic arm spacing (SDAS) of the composites grains and change the coarse plate-like eutectic Si into tiny needle-like fibrous precipitates. HRTEM and XRD studies showed that both Y and T6 treatment influenced the ZrB₂ particle size and distribution by homogenization. In addition, it revealed that the uniform dispersion of the nanoparticles, the improvement of the α-Al grain SDAS, and the alteration of the eutectic Si upon raising the Y concentration to 0.3 wt.% and T6 heat treatment enhanced the hardness, ultimate tensile strength (UTS), and percentage elongation to 140 H V, 294 MPa, and 15.5 %, respectively.

与未增强的6061铝合金相比，纳米颗粒增强的Al-6061具有优越的强度、刚度和抗磨损和抗蠕变性能，这使其成为汽车零部件和航空结构的理想应用。通过原位反应制备复合材料，将K2ZrF6和KBF4两种钾盐以适当的化学量比引入到Al-6061合金熔体中，在850℃下生成ZrB2，用Y （0.1 wt.% & 0.3 wt.%）制备Al-6061-3 wt.% ZrB2复合材料，然后进行T6热处理。研究了不同浓度的钇(Y)和T6处理对均匀分散的二硼化锆（ZrB2）纳米颗粒Al-6061合金复合材料组织和力学性能的影响。T6热处理和0.3 wt.% Y可以同时优化复合材料晶粒的第二枝晶臂间距（SDAS），使粗片状共晶Si变为细小的针状纤维相。HRTEM和XRD研究表明，Y和T6处理均质化影响了ZrB2的粒径和分布。此外，当Y浓度提高到0.3 wt.%和T6热处理时，纳米颗粒的均匀分散、α-Al晶粒SDAS的改善和共晶Si的改变使合金的硬度、极限抗拉强度（UTS）和延伸率分别提高到140 H V、294 MPa和15.5%。

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引用次数: 0

Lase powder bed fusion of Fe-Mn-Si based shape memory alloy with high-performance at room temperature by composition optimization 通过成分优化制备高性能Fe-Mn-Si基形状记忆合金

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-12-01 DOI: 10.1016/j.msea.2025.149555

Jun Ma, Ye Li, Liang Jia, Yan Lin, Jingzhe Niu

To enhance the shape memory effect (SME) of Fe-Mn-Si based shape memory alloy (SMA) made by laser powder bed fusion (LPBF) at room temperature, we developed a new SMA by in-situ alloying of blended powders of FeSi6.5, Cr, Ni, Mn, Si. Compared with the reported SMA, the concentration of Cr and Ni elements was reduced to raise the starting temperature point (Ms) for transformation from fcc phase to hcp phase. High laser energy input is used to enhance the elemental distribution and eliminate the residue bcc phase. As a result, the as-built SMA exhibited a maximum recovery strain as high as 0.065 and its tensile strength and fracturing strain reached 1013 MPa and 0.53, respectively, at room temperature, which is superior to the reported as-built SMAs. The microstructure of the SMA was characterized, and the source of the high performance was discussed. This study demonstrates that optimization of the composition of SMA used for LPBF can significantly raise the Ms without deterioration of other microstructure characteristics, resulting in improvement of the SME under room temperature.

为了提高室温激光粉末床熔合法制备的Fe-Mn-Si基形状记忆合金（SMA）的形状记忆效果，采用原位合金化FeSi6.5、Cr、Ni、Mn、Si混合粉末的方法制备了一种新型形状记忆合金。与已有的SMA相比，降低了Cr和Ni元素的浓度，提高了fcc相向hcp相转变的起始温度点（Ms）。采用高激光能量输入增强了元素分布，消除了残余的bcc相。结果表明，在室温下，建成SMA的最大恢复应变高达0.065，抗拉强度和压裂应变分别达到1013 MPa和0.53 MPa，优于已有的建成SMA。对SMA的微观结构进行了表征，并对其高性能的来源进行了讨论。本研究表明，优化LPBF用SMA的组成可以在不影响其他微观结构特性的情况下显著提高Ms，从而改善室温下的SME。

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引用次数: 0

In-situ DIC study of strain localisation and damage evolution in the B4C-reinforced aluminium metal matrix composite at high temperature 高温下b4c增强铝基复合材料应变局部化与损伤演化的原位DIC研究

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-12-01 DOI: 10.1016/j.msea.2025.149548

Min-Su Lee , Chan-Wool Ahn , Jun Won Yoon , Seok Su Sohn , Seungchan Cho , Tea-Sung Jun , Chang-Soo Park

Boron carbide (B₄C)-reinforced Al metal matrix composites are suitable materials for spent nuclear fuel (SNF) storage due to the excellent neutron absorption capacity. Mechanical and thermal stability of the neutron absorber materials is required for the dry storage cask at the elevated temperature. Here, we report a study of the strain localisation and damage evolution of the B₄C/Al composite at the temperature range from 20 °C to 300 °C. The strain state in each phase of the B₄C/Al composite was investigated by combined optical microscopy and digital image correlation (DIC), electron backscatter diffraction (EBSD) and electron probe micro-analysis (EPMA). The interfacial Ti-B₄C/Al layer was characterised by electron channeling contrast imaging (ECCI). The strain distribution transitions from heterogeneous to homogeneous with increasing temperature from 20 °C to 300 °C. The main failure mode was the B₄C particle cracking at 20 °C, whilst the strong interfacial bonding and intact B₄C particles were found at 150 °C and 300 °C. At the elevated temperature, the diffusion bonding between the Al-matrix and TiAl products facilitates the stress transfer at the B₄C/Al interfaces, thereby reducing the interfacial strain localisation and allowing the B₄C reinforcements to accommodate more strain. The load-carrying capacity of the Al-matrix is reduced by softening effect of DRX. As the result, the Al-matrix was damaged by cracking at 300 °C due to the stress redistribution from the fractured B₄C particles. The findings in the present study provide a comprehensive understanding of the interfacial stress transfer and damage evolution of the B₄C/Al composite at high temperature.

碳化硼（B4C）增强铝基复合材料具有优异的中子吸收能力，是贮存乏燃料的理想材料。干燥储存桶在高温下需要中子吸收材料的机械稳定性和热稳定性。本文研究了B4C/Al复合材料在20 ~ 300℃温度范围内的应变局部化和损伤演化过程。采用光学显微镜与数字图像相关（DIC）、电子背散射衍射（EBSD）和电子探针显微分析（EPMA）相结合的方法研究了B4C/Al复合材料各相的应变状态。采用电子通道对比成像（ECCI）对Ti-B4C/Al界面层进行了表征。从20℃到300℃，随着温度的升高，应变分布由非均匀向均匀转变。在20℃时，B4C颗粒破裂为主要破坏模式，而在150℃和300℃时，B4C颗粒完整且界面结合牢固。在高温下，Al基体和TiAl制品之间的扩散结合促进了B4C/Al界面的应力传递，从而减少了界面应变局部化，使B4C增强材料能够容纳更多的应变。DRX的软化作用降低了铝基的承载能力。结果表明，在300℃时，断裂的B4C颗粒产生应力重分布，导致al基体开裂。本研究结果为B4C/Al复合材料在高温下的界面应力传递和损伤演化提供了全面的认识。

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引用次数: 0

Achieving optimal strength and ductility in medium-entropy alloys under high-strain-rate tension through gradient microstructure design 通过梯度组织设计实现中熵合金在高应变速率下的最佳强度和延展性

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-12-01 DOI: 10.1016/j.msea.2025.149550

Kai Wang , Xuetao Zou , Wurong Jian , Kangbo Yuan , Guanyu Huang , Shuang Qin , Fuping Yuan , Xiaohu Yao

Alleviating strain localization is essential for enhancing the ductility of metallic alloys under dynamic loading conditions. In this study, gradient structures with variations in dislocation density and twin boundary fraction, gradually decreasing from the surface to the core, are designed in CoCrNi medium-entropy alloys (MEAs) using surface mechanical attrition treatment. The tensile behavior of these gradient samples is investigated across a wide range of strain rates, from 0.001 to 3500/s. Both yield and flow stresses increase with strain rate, exhibiting positive strain rate sensitivity. Notably, at 3500/s, the samples show significant improvements in yield strength and uniform elongation compared to those tested at lower strain rates, even surpassing previously reported MEAs. Microstructural analysis shows that the deformation in the core layer transitions from twin nucleation to twin thickening as the strain rate increases. In the surface layer, where pre-existing twins are more abundant, twin thickening is the dominant mechanism and is more pronounced than in the core. At higher strain rates, secondary twins are activated and frequently interact with primary twins in the surface layer, leading to the formation of new nanograins, stacking faults, and phase transformations. This severe deformation also induces the development of deformation bands within the grains. A crossover in dislocation motion from thermally activated to drag-controlled behavior with increasing depth at 3500/s result in enhanced dislocation hardening in the core and more uniform deformation across the sample. The synergistic effects of multiple deformation mechanisms contribute to sustained strain hardening and resist flow instability under high strain rates in gradient MEAs.

缓解应变局部化是提高金属合金在动加载条件下塑性的关键。在本研究中，采用表面机械磨损处理，设计了CoCrNi中熵合金（MEAs）中具有位错密度和孪晶界分数变化的梯度结构，从表面到核心逐渐减小。在0.001到3500/s的应变速率范围内，研究了这些梯度样品的拉伸行为。屈服应力和流动应力均随应变速率的增大而增大，表现出正应变速率敏感性。值得注意的是，与在较低应变率下测试的样品相比，在3500/s下，样品的屈服强度和均匀伸长率显着提高，甚至超过了先前报道的mea。显微组织分析表明，随着应变速率的增大，芯层变形由孪晶形核向孪晶增厚转变。在表层，预先存在的孪晶更为丰富，孪晶增厚是主要机制，比岩心更为明显。在较高的应变速率下，次生孪晶被激活，并频繁地与表层的原生孪晶相互作用，导致新的纳米颗粒的形成、层错和相变。这种剧烈的变形还导致了晶粒内部变形带的形成。在3500/s下，随着深度的增加，位错运动从热激活转变为拖阻控制，从而增强了岩心的位错硬化，并使整个样品的变形更加均匀。多种变形机制的协同作用有助于梯度mea在高应变速率下的持续应变硬化和抵抗流动不稳定性。

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引用次数: 0

Simultaneously improved strength and ductility of selective laser melting fabricated Fe10Co30Ni30Cr10Al18W2 eutectic high-entropy alloys via tailored annealing strategy 采用定制退火策略，同时提高了选择性激光熔化制备的Fe10Co30Ni30Cr10Al18W2共晶高熵合金的强度和延展性

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-12-01 DOI: 10.1016/j.msea.2025.149557

Yijian Zeng , Jiajia Shen , Jin Yang , Min Zheng , Jing Xue , J.P. Oliveira , Jun Li , Kai Feng , Yulong Li , Hua Zhang

In this study, Fe₁₀Co₃₀Ni₃₀Cr₁₀Al₁₈W₂ eutectic high-entropy alloys (EHEAs) were successfully fabricated via selective laser melting (SLM). To improve the strength and ductility of the SLM-fabricated EHEAs, different annealing strategies were tailored (600/800/1000/1200 °C for 4 h). The influences of different annealing conditions on the face-centered cubic (FCC)/body-centered cubic (BCC) phase evolution, microstructural characteristics, and mechanical properties were systematically investigated, and their underlying relationships were elucidated. In the as-built condition, the FCC phase accounted for only 4.2 % and was primarily located along the molten pool boundaries. With increasing annealing temperature, the FCC phase grew and homogenized, forming an interlocking dendritic FCC/BCC structure, which significantly enhanced both strength and ductility. After annealing at 1200 °C, the alloy exhibited a peak tensile strength of 1054 MPa and an elongation of 19.1 %, representing improvements of 5.69 and 3.76 times, respectively, compared to the as-built sample. Quantitative analysis revealed that the primary strengthening mechanisms were the interlocking dendritic FCC/BCC structure (∼496 MPa) and dislocation strengthening (∼440 MPa), with additional contribution from solid solution strengthening (∼76 MPa). The strain-induced backstress at FCC/BCC phase boundaries impedes dislocation motion, thus enhancing both tensile strength and plasticity. This work provides theoretical insight and quantitative guidance for understanding and optimizing the post-processing of SLM-fabricated EHEAs.

采用选择性激光熔化法制备了Fe10Co30Ni30Cr10Al18W2共晶高熵合金（EHEAs）。为了提高slm制造的EHEAs的强度和延展性，定制了不同的退火策略（600/800/1000/1200°C， 4小时）。系统研究了不同退火条件对面心立方(FCC)/体心立方（BCC）相演化、微观组织特征和力学性能的影响，并阐明了它们之间的内在关系。在建成条件下，FCC相仅占4.2%，且主要位于熔池边界。随着退火温度的升高，FCC相逐渐长大并均匀化，形成联锁的枝晶FCC/BCC结构，强度和塑性均得到显著提高。经1200℃退火后，合金的峰值抗拉强度为1054 MPa，伸长率为19.1%，分别提高了5.69倍和3.76倍。定量分析表明，主要强化机制是联锁枝晶FCC/BCC结构（~ 496 MPa）和位错强化（~ 440 MPa），固溶体强化（~ 76 MPa）也有贡献。FCC/BCC相界处的应变诱导背应力阻碍了位错运动，从而提高了抗拉强度和塑性。这项工作为理解和优化slm制备的EHEAs后处理提供了理论见解和定量指导。

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引用次数: 0

Mechanism of deformation conditions affecting martensitic transformation in low-carbon steel during novel temperature-controlled quenching and deformation synergistic control process 新型温控淬火变形协同控制工艺中变形条件影响低碳钢马氏体转变的机理

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-12-01 DOI: 10.1016/j.msea.2025.149556

Chenyang Gu , Tianliang Fu , Yueman He , Yan Yang , Zhenglei Tang , Guodong Wang

To address the challenges of high residual stress and significant quenching distortion in thin-gauge martensitic steel plates, this study systematically investigated a novel temperature-controlled quenching and deformation (TCQD) synergistic control process. Four distinct processes with varying deformation conditions were designed and compared with the conventional quenching-tempering (Q-T) method. The results show that the TCQD process can produce quenched martensitic steel with an optimized microstructure and mechanical properties without the need for tempering, with only minimal reductions in tensile strength (4.7 %) and hardness (1.4 %). Notably, it also reduces the residual stress by 7.9 % and the dislocation density by 24.2 %, while it improves the ductility by 8.6 % and the toughness by 3.6 %. The slow cooling within the martensitic transformation range in the TCQD process effectively suppresses the transformation, which is the fundamental reason for the relatively low dislocation density and residual stress in the new process. Moreover, variations in the transformation driving force and cementite precipitation behavior under different processing conditions are the main factors responsible for the differences in dislocation density and residual stress among the samples produced by the new process. The overall improvement in mechanical properties stems from the optimized regulation of nano-carbide precipitation behavior and size (reduced by 24.4 %), a significantly decreased dislocation density, and an increased high-angle grain boundary (HAGB) density due to the absence of tempering (increased by 37.1 %). This study suggests that this new process has the potential to replace the conventional Q-T process, substantially increase production efficiency, and provide a promising solution for quenching thin-gauge martensitic steel plates with high flatness and low residual stress.

针对薄型马氏体钢板残余应力高、淬火变形严重的问题，系统研究了一种新型的温控淬火与变形协同控制工艺。设计了四种不同变形条件下的不同工艺，并与传统的调质方法进行了比较。结果表明，TCQD工艺可获得组织和力学性能均优化的淬火马氏体钢，且无需回火，抗拉强度和硬度仅降低4.7%和1.4%。值得注意的是，它还使残余应力降低了7.9%，位错密度降低了24.2%，同时使塑性提高了8.6%，韧性提高了3.6%。TCQD工艺在马氏体相变范围内的缓慢冷却有效地抑制了相变，这是新工艺中位错密度和残余应力相对较低的根本原因。不同工艺条件下的相变驱动力和渗碳体析出行为的差异是造成新工艺样品中位错密度和残余应力差异的主要原因。整体力学性能的改善主要得益于纳米碳化物析出行为和尺寸的优化（降低了24.4%），位错密度的显著降低，以及由于不回火而导致的高角晶界（HAGB）密度的增加（提高了37.1%）。研究表明，该工艺有望取代传统的Q-T工艺，大幅提高生产效率，为高平整度、低残余应力的马氏体薄板的淬火提供一种有前景的解决方案。

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引用次数: 0

Microstructural and mechanical response of SLM-fabricated GH3536 alloy under coupled regulation of in-situ laser remelting and heat treatment 原位激光重熔与热处理耦合调控下slm制备GH3536合金的组织与力学响应

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-12-01 DOI: 10.1016/j.msea.2025.149558

Yunqi Xie , Huachen Liu , Yaowei Xia , Song Huang , Zhenhua Yao

In this study, a coupled optimization process combining in-situ laser remelting (ILR) with heat treatment (HT) was proposed and applied to fabricate GH3536 nickel-based superalloys. The results demonstrate that this hybrid technique significantly refines the grain structure, promotes the transformation from columnar to equiaxed grains, enhances grain orientation uniformity, and effectively reduces both residual stress and dislocation density. Microstructural analysis reveals that the ILR + HT process promotes the uniform precipitation of spherical carbides both at grain boundaries and within grains, thereby eliminating microcracks and significantly decreasing porosity. After ILR + HT treatment, the porosity decreased to below 0.05 %, and the average pore size was reduced to the submicron scale, while the average grain size was refined to 25.43 μm. The ILR + HT-treated samples exhibited the best comprehensive mechanical properties, with an ultimate tensile strength of 867.5 MPa, an elongation of 51.6 %, and a microhardness of 272.4 HV. This study addresses key issues commonly associated with selective laser melting (SLM) of GH3536 alloys, including the dominance of columnar grains, high residual stress, and unbalanced mechanical properties. The findings provide a novel strategy for defect mitigation and performance enhancement in the additive manufacturing of nickel-based superalloys.

本研究提出了原位激光重熔（ILR）与热处理（HT）相结合的耦合优化工艺，并将其应用于GH3536镍基高温合金的制备。结果表明：该杂化技术显著细化了晶粒组织，促进了晶粒由柱状晶向等轴晶转变，提高了晶粒取向均匀性，有效降低了残余应力和位错密度。显微组织分析表明，ILR + HT工艺促进了晶界和晶内球形碳化物的均匀析出，从而消除了微裂纹，显著降低了孔隙率。经ILR + HT处理后，孔隙率降至0.05%以下，平均孔径降至亚微米级，平均晶粒尺寸细化至25.43 μm。经ILR + ht处理后的试样综合力学性能最佳，抗拉强度为867.5 MPa，伸长率为51.6%，显微硬度为272.4 HV。本研究解决了GH3536合金选择性激光熔化（SLM）中常见的关键问题，包括柱状晶粒的主导、高残余应力和不平衡的力学性能。研究结果为镍基高温合金增材制造中的缺陷缓解和性能提高提供了一种新的策略。

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引用次数: 0

Synergistic strengthening in an Al-5Mg-2Zn-0.5Cu alloy with a multi-scale microstructure 多尺度组织Al-5Mg-2Zn-0.5Cu合金的协同强化

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-12-01 DOI: 10.1016/j.msea.2025.149559

Teng Tian , Min Zha , Shi-Chao Wang , Shao-You Zhang , Shen-Bao Jin , Alexander Kren , Hui-Yuan Wang

Overcoming the trade-off between strength and ductility has long been a significant challenge. This study presents a novel multi-scale microstructure in an Al-5Mg-2Zn-0.5Cu alloy prepared via twin-roll casting (TRC) followed by 4-passes rolling, integrating nanoscale precipitates, submicron low-angle grain boundary (LAGB) networks and heterogeneous grain structure. This multi-scale microstructure endows an exceptional balance between strength and ductility in the Al-Mg based alloy, with a high yield strength of ∼530 MPa, an ultimate tensile strength of ∼600 MPa alongside a decent elongation of ∼8%. Microstructural analysis indicates that the combined alloying of Zn and Cu effectively enhances the precipitation of T′ nano particles, thereby improving both age-hardening and work hardening capabilities. Meanwhile, the submicron-scale LAGB networks provide effective grain boundary strengthening and meanwhile facilitate the coordination of local strain distribution. This multi-scale structural design strategy offers a promising approach to overcoming strength-ductility trade-off in Al alloys. Additionally, the TRC and rolling route utilized in present work can be readily scaled-up and suitable for mass industrial production.

长期以来，克服强度和延性之间的权衡一直是一个重大挑战。通过双辊铸造（TRC）和四道次轧制制备的Al-5Mg-2Zn-0.5Cu合金，形成了纳米级析出相、亚微米低角晶界（LAGB）网络和非均质晶粒组织的多尺度显微组织。这种多尺度微观结构使Al-Mg基合金在强度和延展性之间取得了卓越的平衡，其屈服强度高达~ 530 MPa，极限抗拉强度为~ 600 MPa，延伸率为~ 8%。显微组织分析表明，Zn和Cu的复合合金化有效地促进了T′纳米颗粒的析出，从而提高了时效硬化和加工硬化能力。同时，亚微米尺度的LAGB网络提供了有效的晶界强化，同时促进了局部应变分布的协调。这种多尺度结构设计策略为克服铝合金的强度-延性权衡提供了一种有希望的方法。此外，本工作中使用的TRC和轧制路线易于扩大规模，适合大规模工业生产。

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引用次数: 0

The effect of rhenium (Re) on the microstructure evolution and tensile strength of the as-annealed Al–Cu–Mg cold rolled sheet during isothermal annealing at 320 °C 在320℃等温退火过程中，铼（Re）对退火Al-Cu-Mg冷轧薄板组织演变和拉伸强度的影响

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-12-01 DOI: 10.1016/j.msea.2025.149551

Xinhao Zhao , Fanghua Shen , Huabiao Chen , Yuxun Zhang , Zhenzhong Sun , Xiaoou Yi , Danqing Yi , Shaoqun Kuang , Zhefeng Zhang

Rhenium (Re) is a strategic scarce metal element with excellent high temperature properties. In this work, the effects of Re (0.1 wt%) microalloying on the microstructural evolution and the relationship with tensile strength in as-isothermal annealed Al–Cu–Mg and Al–Cu–Mg–Re cold rolled sheets were explored for the first time. The influence of texture on mechanical property, and the complicated texture evolution rules and mechanism were revealed using our unique texture index F_CGB (Intensity ratio between Cube and Brass at the standard position (deviation = 0°) in Euler space) and the orientation streamline approach. The results indicated that the Re addition has delayed the recrystallization and changed the overall texture intensity and texture evolution paths obviously. Furthermore, during the isothermal annealing, F_CGB exhibited a positive correlation with tensile strength, which shows the significant texture strengthening effect, and might be further related to the weight of high-angle grain boundary, especially the ∑3 twin boundary. During the subsequent long-time recrystallization annealing, Re and Al₆(FeMn, Re) improved the tensile strength and toughness of the aluminum alloy. Specially, the Mg₂Si phase promoted the formation of the θ phase by providing heterogeneous nucleation sites, and stacking faults (SFs) provide a possible channel, thus storage dislocations in θ. The interface segregation of Re reduced the interfacial energy of the Al/θ interface, and then inhibited the coarsening of θ precipitates, which together caused the tensile properties advantage of Al-Cu-Mg-Re samples at room temperature.

铼（Re）是一种具有优良高温性能的战略性稀有金属元素。本文首次探讨了Re （0.1 wt%）微合金化对等温退火Al-Cu-Mg和Al-Cu-Mg - Re冷轧薄板组织演变的影响及其与拉伸强度的关系。利用独特的织构指标FCGB（欧拉空间标准位置（偏差= 0°）立方体与黄铜的强度比）和取向流线法揭示了织构对力学性能的影响，揭示了织构演化的复杂规律和机理。结果表明，稀土的加入延缓了再结晶过程，明显改变了织构强度和织构演化路径。等温退火过程中，FCGB与拉伸强度呈正相关，表现出明显的织构强化效果，并可能与高角晶界，特别是∑3孪晶界的重量有关。在随后的长时间再结晶退火过程中，Re和Al6（FeMn, Re）提高了铝合金的抗拉强度和韧性。特别是，Mg2Si相通过提供非均相成核位点促进了θ相的形成，而层错（SFs）提供了一个可能的通道，从而导致了θ相的存储位错。Re的界面偏析降低了Al/θ界面的界面能，从而抑制了θ相的粗化，从而使Al- cu - mg -Re样品在室温下具有良好的拉伸性能。

{"title":"The effect of rhenium (Re) on the microstructure evolution and tensile strength of the as-annealed Al–Cu–Mg cold rolled sheet during isothermal annealing at 320 °C","authors":"Xinhao Zhao , Fanghua Shen , Huabiao Chen , Yuxun Zhang , Zhenzhong Sun , Xiaoou Yi , Danqing Yi , Shaoqun Kuang , Zhefeng Zhang","doi":"10.1016/j.msea.2025.149551","DOIUrl":"10.1016/j.msea.2025.149551","url":null,"abstract":"<div><div>Rhenium (Re) is a strategic scarce metal element with excellent high temperature properties. In this work, the effects of Re (0.1 wt%) microalloying on the microstructural evolution and the relationship with tensile strength in as-isothermal annealed Al–Cu–Mg and Al–Cu–Mg–Re cold rolled sheets were explored for the first time. The influence of texture on mechanical property, and the complicated texture evolution rules and mechanism were revealed using our unique texture index F<sub>CGB</sub> (Intensity ratio between Cube and Brass at the standard position (deviation = 0°) in Euler space) and the orientation streamline approach. The results indicated that the Re addition has delayed the recrystallization and changed the overall texture intensity and texture evolution paths obviously. Furthermore, during the isothermal annealing, F<sub>CGB</sub> exhibited a positive correlation with tensile strength, which shows the significant texture strengthening effect, and might be further related to the weight of high-angle grain boundary, especially the ∑3 twin boundary. During the subsequent long-time recrystallization annealing, Re and Al<sub>6</sub>(FeMn, Re) improved the tensile strength and toughness of the aluminum alloy. Specially, the Mg<sub>2</sub>Si phase promoted the formation of the θ phase by providing heterogeneous nucleation sites, and stacking faults (SFs) provide a possible channel, thus storage dislocations in θ. The interface segregation of Re reduced the interfacial energy of the Al/θ interface, and then inhibited the coarsening of θ precipitates, which together caused the tensile properties advantage of Al-Cu-Mg-Re samples at room temperature.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"950 ","pages":"Article 149551"},"PeriodicalIF":7.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145691378","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}

引用次数: 0

Microstructure and mechanical properties of Ni39Co26Cr26Al4Ti5 high-entropy alloy with heterogeneous structures design by high-pressure technique 高压技术设计非均质组织Ni39Co26Cr26Al4Ti5高熵合金的组织与力学性能

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A

Pub Date : 2025-12-01 DOI: 10.1016/j.msea.2025.149554

R. Li , G.S. Zhang , Y.T. Ding , X.W. Zhang , Y.F. Yan , H.R. Wu , L.L. Xiao , H.F. Zhang , J. Du , Z.Y. Zhu , P.F. Yue , M.D. Zhang , K.X. Song , G. Li

Understanding and leveraging heterogeneous microstructural design can significantly contribute to directionally optimizing mechanical performance in advanced materials. This study demonstrates a heterogeneous structured Ni₃₉Co₂₆Cr₂₆Al₄Ti₅ high-entropy alloy (HEA) via cold rolling combined with high-pressure and high-temperature (HPHT) processing. The Ni₃₉Co₂₆Cr₂₆Al₄Ti₅ HEA annealed by 1000 °C under high-pressure exhibits a heterogeneous microstructure characterized by coarse non-recrystallized grains, ultrafine grains and submicron or nano-scale precipitates distributed within grain boundaries or grain interior. The Ni₃₉Co₂₆Cr₂₆Al₄Ti₅ HEA annealed by 1100 °C under high-pressure exhibits an inverse gradient structure featuring coarser surface grains transitioning to nanoscale core grains, driven by pressure-enhanced thermal diffusion attenuation with thickness, and along with submicron or nano-scale precipitates distributed within grain boundaries or grain interior. This microstructural gradient correlates with hardness distribution, where refined grains enhance mechanical properties. The HEA achieves exceptional strength-ductility synergy with yield strength of 1512 ± 33 MPa, ultimate tensile strength of 1645 ± 53 MPa and uniform elongation of 15.01 ± 2.03 %, attributed to the presence of stacking faults, deformation twins, and Lomer-Cottrell locks. This inverse gradient structure design, achieved via pressure application, offers a promising paradigm for developing HEAs with superior mechanical performance.

理解和利用非均质微观结构设计可以显著地有助于定向优化先进材料的机械性能。通过冷轧结合高压高温（HPHT）工艺制备了非均相组织的Ni39Co26Cr26Al4Ti5高熵合金（HEA）。高压1000℃退火后的Ni39Co26Cr26Al4Ti5 HEA呈现非均匀组织，主要表现为粗大的非再结晶晶粒、超细晶粒和分布在晶界或晶粒内部的亚微米或纳米级析出相。1100℃高压退火后的Ni39Co26Cr26Al4Ti5 HEA，在压力增强热扩散随厚度衰减的驱动下，呈现出较粗的表面晶粒向纳米级核心晶粒过渡的反梯度结构，并伴有分布在晶界或晶粒内部的亚微米级或纳米级析出相。这种显微结构梯度与硬度分布有关，其中细化的晶粒增强了机械性能。由于层错、变形孪晶和lomo - cottrell锁的存在，HEA的屈服强度为1512±33 MPa，极限抗拉强度为1645±53 MPa，均匀伸长率为15.01±2.03%。这种通过压力应用实现的逆梯度结构设计，为开发具有优异机械性能的HEAs提供了一个有希望的范例。

{"title":"Microstructure and mechanical properties of Ni39Co26Cr26Al4Ti5 high-entropy alloy with heterogeneous structures design by high-pressure technique","authors":"R. Li , G.S. Zhang , Y.T. Ding , X.W. Zhang , Y.F. Yan , H.R. Wu , L.L. Xiao , H.F. Zhang , J. Du , Z.Y. Zhu , P.F. Yue , M.D. Zhang , K.X. Song , G. Li","doi":"10.1016/j.msea.2025.149554","DOIUrl":"10.1016/j.msea.2025.149554","url":null,"abstract":"<div><div>Understanding and leveraging heterogeneous microstructural design can significantly contribute to directionally optimizing mechanical performance in advanced materials. This study demonstrates a heterogeneous structured Ni<sub>39</sub>Co<sub>26</sub>Cr<sub>26</sub>Al<sub>4</sub>Ti<sub>5</sub> high-entropy alloy (HEA) via cold rolling combined with high-pressure and high-temperature (HPHT) processing. The Ni<sub>39</sub>Co<sub>26</sub>Cr<sub>26</sub>Al<sub>4</sub>Ti<sub>5</sub> HEA annealed by 1000 °C under high-pressure exhibits a heterogeneous microstructure characterized by coarse non-recrystallized grains, ultrafine grains and submicron or nano-scale precipitates distributed within grain boundaries or grain interior. The Ni<sub>39</sub>Co<sub>26</sub>Cr<sub>26</sub>Al<sub>4</sub>Ti<sub>5</sub> HEA annealed by 1100 °C under high-pressure exhibits an inverse gradient structure featuring coarser surface grains transitioning to nanoscale core grains, driven by pressure-enhanced thermal diffusion attenuation with thickness, and along with submicron or nano-scale precipitates distributed within grain boundaries or grain interior. This microstructural gradient correlates with hardness distribution, where refined grains enhance mechanical properties. The HEA achieves exceptional strength-ductility synergy with yield strength of 1512 ± 33 MPa, ultimate tensile strength of 1645 ± 53 MPa and uniform elongation of 15.01 ± 2.03 %, attributed to the presence of stacking faults, deformation twins, and Lomer-Cottrell locks. This inverse gradient structure design, achieved via pressure application, offers a promising paradigm for developing HEAs with superior mechanical performance.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"950 ","pages":"Article 149554"},"PeriodicalIF":7.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145691423","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}

引用次数: 0