Materials Science and Engineering: A最新文献_第3页

Oxidation-creep degradation mechanism of coating/superalloy with different Al and Cr content in coatings and the optimization strategy 不同Al、Cr含量涂层/高温合金氧化蠕变降解机理及优化策略

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

Materials Science and Engineering: A

Pub Date : 2026-02-01 DOI: 10.1016/j.msea.2026.149851

Jie Kang , Yuan Liu , Hui Wang , Ruisong Jiang , Heng Zhang , Yi Ru , Shusuo Li , Yanling Pei , Yongming Wang , Shengkai Gong

As turbine inlet temperatures in advanced aeroengines continue to rise, achieving an optimal balance between the creep resistance and oxidation resistance of the coating/superalloy at 1200 °C has become increasingly difficult. In this study, multiscale analysis combined with thermodynamic calculations was employed to investigate the oxidation-creep behavior of NiCrAlYSi coatings, NiAl coatings, Al gradient NiCrAlYSi coatings and the uncoated superalloy. The results show that at 850 °C/500 MPa, the oxidation-creep degradation is the stress-sensitive damage manifesting as topologically close-packed (TCP) phase induced cracking. The coatings with varying Al and Cr contents exhibit sufficient plasticity to withstand creep loading until substrate fracture, without generating cracks themselves. At 1200 °C/80 MPa, the oxidation-creep degradation is the oxidation-diffusion damage. For the NiCrAlYSi coating, the formation of Cr-rich γ phase at the NiCrAlYSi coating/superalloy interface exerted little adverse effect on creep performance. Increasing the Al content in the coating enhances the oxidation resistance but reduces the creep performance of superalloy. For the Al gradient NiCrAlYSi coating, the IDZ consists of Cr-rich γ phases. Despite TCP precipitation, its SRZ retains the key γ/γ′ structure. In contrast, the NiAl coating exhibits a more degraded microstructure dominated by γ′ and TCP phases, accompanied by TCP reorientation, which is detrimental to the creep performance. Notably, the oxide scales with higher elastic modulus experience greater stress, which leads to the initiation of cracks. The pores form at the coating/superalloy interface cause crack deflection, thereby impeding crack penetration into the substrate. The significance of this study lies in managing Al/Cr diffusion to mitigate the creep degradation as much as possible. Tailoring the Al/Cr gradient distribution in NiCrAlYSi coatings is an effective strategy to synergistically enhance both oxidation resistance and creep resistance.

随着先进航空发动机涡轮入口温度的不断升高，涂层/高温合金在1200℃时的抗蠕变和抗氧化性能之间达到最佳平衡变得越来越困难。本研究采用多尺度分析和热力学计算相结合的方法研究了NiCrAlYSi涂层、NiAl涂层、Al梯度NiCrAlYSi涂层和未涂层高温合金的氧化蠕变行为。结果表明：在850℃/500 MPa时，氧化蠕变降解为应力敏感型损伤，表现为拓扑紧密堆积（TCP）相诱发裂纹；具有不同Al和Cr含量的涂层表现出足够的塑性，可以承受蠕变载荷，直到基体断裂，而不会产生裂纹。在1200℃/80 MPa时，氧化-蠕变降解为氧化-扩散损伤。对于NiCrAlYSi涂层，在NiCrAlYSi涂层/高温合金界面处形成富cr γ相对蠕变性能影响不大。增加涂层中Al含量可提高合金的抗氧化性能，但会降低合金的蠕变性能。对于Al梯度NiCrAlYSi涂层，IDZ由富cr γ相组成。尽管有TCP沉淀，但其SRZ保留了关键的γ/γ′结构。相反，NiAl涂层表现出以γ′相和TCP相为主的劣化组织，并伴有TCP重取向，这对蠕变性能不利。值得注意的是，具有较高弹性模量的氧化鳞片承受更大的应力，从而导致裂纹的产生。在涂层/高温合金界面处形成的孔隙导致裂纹偏转，从而阻碍裂纹渗入基体。本研究的意义在于控制Al/Cr扩散，尽可能地减轻蠕变退化。调整NiCrAlYSi涂层中的Al/Cr梯度分布是协同提高抗氧化性和抗蠕变性的有效策略。

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引用次数: 0

The impact of nano-Y2O3 additives on the microstructure and strength-ductility properties of INCONEL 718 纳米y2o3添加剂对INCONEL 718显微组织和强延性质的影响

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

Materials Science and Engineering: A

Pub Date : 2026-02-01 DOI: 10.1016/j.msea.2026.149803

Shicheng Li, Chong Li, Qianying Guo, Yongchang Liu

This study employs mechanical-milling (MM) to disperse varying concentrations (0, 0.2, 0.5, 0.8 wt%) of nano-sized Y₂O₃ particles into pre-alloyed INCONEL 718 powder. The effects of nanoparticles on the microstructure and mechanical properties of the alloy are systematically investigated through a combination of rapid hot-pressing sintering and standard heat treatment. The results reveal that Y₂O₃ reacts with Al to form monoclinic Y₄Al₂O₉ (YAM), which moderately reduce the precipitation of the γ′ phase while optimizing the morphology and distribution of the γ'' phase. The addition of an appropriate amount of Y₂O₃ (0.5 wt %) can significantly enhance the strength, with the UTS reaching up to 1563 MPa. These enhancements are attributed to the pinning effects of YAM at grain boundaries, and the synergistic strengthening from the γ'' through enhanced nucleation sites and diffusion control. Excessive addition of Y₂O₃ leads to coarsening of oxide particles and segregation at grain boundaries, resulting in a significant drop in ductility. This study elucidates that Y₂O₃ enhances high-temperature performance of the alloy through a synergistic mechanism of “YAM dispersion strengthening - γ″ phase optimization,” providing theoretical support for the design and engineering applications of high-performance ODS-INCONEL 718 alloys.

本研究采用机械铣削（MM）将不同浓度（0、0.2、0.5、0.8 wt%）的纳米级Y2O3颗粒分散到预合金INCONEL 718粉末中。采用快速热压烧结和标准热处理相结合的方法，系统研究了纳米颗粒对合金组织和力学性能的影响。结果表明，Y2O3与Al反应形成单斜晶Y4Al2O9 (YAM)，适度减少了γ′相的析出，同时优化了γ′相的形貌和分布。加入适量的Y2O3 （0.5 wt %）可显著提高材料的强度，其强度可达1563 MPa。这些增强归因于YAM在晶界的钉钉作用，以及通过增强形核位点和扩散控制来自γ”的协同强化。过量添加Y2O3导致氧化物颗粒粗化，晶界偏析，塑性显著下降。本研究阐明了Y2O3通过“YAM弥散强化- γ″相优化”的协同机制提高了合金的高温性能，为高性能ODS-INCONEL 718合金的设计和工程应用提供了理论支持。

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引用次数: 0

Influence of LaB6 concentration gradient on the microstructure and properties of direct current electrodeposited copper foils LaB6浓度梯度对直流电沉积铜箔微观结构和性能的影响

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

Materials Science and Engineering: A

Pub Date : 2026-02-01 DOI: 10.1016/j.msea.2026.149782

Yunhao Zhao , Yuehong Zheng , Yang Liu , Zhumin Li , Hui Fu , Tenglong Zhang , Shipeng Xu , Zhengze Pan , Gang Dong , Min Zhu , Faqi Zhan , Peiqing La

Electrolyte additives play a critical role in controlling the microstructure and mechanical properties of electrodeposited copper foils. LaB₆ nanoparticles, as multifunctional additives, combine the chemical modulation effect of the rare earth element lanthanum with the physical grain-refinement capability of ceramic particles, thereby offering significant potential for enhancing the mechanical performance of electrodeposited copper foils. This study systematically investigates the influence of nano-LaB₆ concentration on the microstructure, mechanical properties, and electrodeposition process of copper foils. The results indicate that the incorporation of LaB₆ effectively modulates the crystallographic texture of the copper foil, leading to a non-monotonic evolution of the (111)_Cu preferred orientation, which is characterized by an initial enhancement followed by a gradual weakening as the additive concentration increases. Furthermore, LaB₆ enhances cathodic polarization, suppresses the reduction kinetics of Cu²⁺ ions, and thereby promotes significant grain refinement, reducing the average grain size from 0.71 μm to 0.53 μm. During electrodeposition, lanthanum reacts with copper to form Cu₆La second-phase particles, which contribute to improved strength-ductility synergy. At an optimal LaB₆ concentration of 14 mg/L, the copper foil achieves a tensile strength of 510 MPa and an elongation of 4.3 %, representing a balanced enhancement of high strength and favorable ductility. This study elucidates the regulatory mechanism of nano-LaB₆ during the electrodeposition process, offering a novel additive design strategy for the development of high-performance electrodeposited copper foils.

电解质添加剂对电沉积铜箔的微观结构和力学性能起着至关重要的作用。LaB6纳米粒子作为多功能添加剂，将稀土元素镧的化学调制效应与陶瓷颗粒的物理晶粒细化能力相结合，为提高电沉积铜箔的力学性能提供了巨大的潜力。本研究系统地研究了纳米lab6浓度对铜箔微观结构、力学性能和电沉积工艺的影响。结果表明，LaB6的加入有效地调节了铜箔的晶体织构，导致（111）Cu优先取向的非单调演化，其特征是随着添加剂浓度的增加，初始增强，然后逐渐减弱。此外，LaB6增强了阴极极化，抑制了Cu2+离子的还原动力学，从而促进了晶粒的细化，使平均晶粒尺寸从0.71 μm减小到0.53 μm。在电沉积过程中，镧与铜反应形成Cu6La第二相粒子，这有助于提高强度-塑性协同作用。当LaB6的最佳浓度为14 mg/L时，铜箔的抗拉强度为510 MPa，伸长率为4.3%，实现了高强度和良好延展性的平衡增强。本研究阐明了纳米lab6在电沉积过程中的调控机制，为开发高性能电沉积铜箔提供了一种新的添加剂设计策略。

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引用次数: 0

Processability and interfacial characteristics in PBF-LB/M-processed nano-B4C/AlSi10Mg composites with superior high-temperature mechanical performance PBF-LB/ m加工的具有优异高温力学性能的纳米b4c /AlSi10Mg复合材料的加工性能和界面特性

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

Materials Science and Engineering: A

Pub Date : 2026-02-01 DOI: 10.1016/j.msea.2026.149838

Abdelrahman Elsayed , Ivo Šulák , Frederike Brasche , Tarek Allam , Marion Kreins , Ulrich Krupp , Christian Haase

Incorporating nano-scaled ceramic particles into additively manufactured Al-alloys is a validated strategy to simultaneously enhance the elevated-temperature mechanical properties and laser powder bed fusion (PBF-LB/M) processability. While B₄C exhibits outstanding thermal stability and interfacial compatibility with Al, the integration of nano-B₄C into Al alloys through PBF-LB/M remains insufficiently investigated. In particular, the underlying mechanisms governing laser-particle interaction, processability, and the consequent microstructural formation have not been comprehensively explored. This study aims to address this gap by investigating the effect of nano-B₄C additions (1, 3, and 5 wt%) to AlSi10Mg on PBF-LB/M processability and the alloy behavior. The results demonstrated excellent PBF-LB/M processability of the B₄C/AlSi10Mg composites at all weight fractions of B₄C. The as-built B₄C/AlSi10Mg revealed a remarkable columnar-to-equiaxed transition, featuring an ultrafine grain structure (as small as 1.23 μm) with almost random crystallographic texture. This grain refinement was attributed to a reactive nucleation process, where the interfacial reaction between B₄C and the matrix results in the coherent AlB₂ core-shell structured phase. Furthermore, this interfacial reaction induced a novel morphological transition, characterized by the spheroidization of irregularly shaped nanoparticles as a consequence of partial reactive melting. The B₄C nanocomposites exhibited superior elevated-temperature mechanical properties, increasing tensile strength by up to 60 % compared to their AlSi10Mg counterparts. This study provides fundamental insights into the design and PBF-LB/M processing of Al-based metal-matrix nanocomposites (AMMNCs) for high-temperature applications.

将纳米级陶瓷颗粒掺入增材制造的铝合金中，可以同时提高铝合金的高温力学性能和激光粉末床熔合（PBF-LB/M）加工性能。虽然B4C表现出优异的热稳定性和与Al的界面相容性，但通过PBF-LB/M将纳米B4C整合到铝合金中的研究还不够充分。特别是，控制激光粒子相互作用的潜在机制，可加工性，以及随之而来的微观结构的形成还没有得到全面的探讨。本研究旨在通过研究AlSi10Mg中添加纳米b4c（1、3和5 wt%）对PBF-LB/M可加工性和合金行为的影响来解决这一空白。结果表明，B4C/AlSi10Mg复合材料在B4C的所有重量分数下都具有良好的PBF-LB/M加工性能。构建的B4C/AlSi10Mg呈现出显著的柱状向等轴转变，具有小至1.23 μm的超细晶粒结构和几乎随机的晶体织构。这种晶粒细化归因于反应性成核过程，其中B4C与基体之间的界面反应导致AlB2核壳结构相的形成。此外，这种界面反应诱导了一种新的形态转变，其特征是不规则形状的纳米颗粒由于部分反应性熔化而球化。B4C纳米复合材料表现出优异的高温力学性能，与AlSi10Mg纳米复合材料相比，抗拉强度提高了60%。该研究为高温铝基金属基纳米复合材料（ammnc）的设计和PBF-LB/M工艺提供了基础见解。

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引用次数: 0

Effect of annealing on microstructures and tensile properties of high-pressure torsion-strained low-to-high Fe-content AA5182 aluminum alloys 退火对高压扭转应变低至高铁AA5182铝合金组织和拉伸性能的影响

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

Materials Science and Engineering: A

Pub Date : 2026-02-01 DOI: 10.1016/j.msea.2026.149856

Chao Yang , Haonan Guo , Xiuzhen Zhang , Wenpeng Cheng , Dongsheng Fu , Si Gao , Shuaihang Pan , Dengshan Zhou , Deliang Zhang , Gaowu Qin

The sustainable recycling and upcycling of aluminum (Al) scrap, particularly wrought alloys, is imperative in the era of 'green aluminum'. A key challenge is managing iron (Fe) impurity accumulation, which typically degrades mechanical properties. In this study, we present an approach to enhance Fe tolerance in imitated recycled AA5182 Al alloys (0–1.0 wt% Fe) through severe plastic deformation via high-pressure torsion (HPT). We systematically investigated the evolution of microstructures and tensile properties of as-HPTed alloys during annealing at different temperatures. Results demonstrate that HPT effectively fragments and disperses coarse Fe-rich intermetallics. For Fe contents below 0.75 wt%, these fragmented particles resist coarsening and maintain a fine dispersion even after annealing at 325 °C. Further, we reveal that nanoscale Fe-/manganese-rich dispersoids inhibit grain growth via Zener pinning and contribute to strain hardening. These synergistic effects enable the 275°C-annealed AA5182 alloy with 0.3 wt% Fe to achieve a high strength of ∼500 MPa and a uniform plastic strain exceeding 8 %. Our observations highlight the critical role of microstructural engineering via plastic deformation in developing high-performance, Fe-tolerant recycled wrought Al alloys.

在“绿色铝”时代，可持续回收和升级铝（Al）废料，特别是锻造合金，是势在必行的。一个关键的挑战是控制铁（Fe）杂质的积累，这通常会降低机械性能。在这项研究中，我们提出了一种通过高压扭转（HPT）进行剧烈塑性变形来提高模拟再生AA5182铝合金（0-1.0 wt% Fe）铁容忍度的方法。我们系统地研究了不同退火温度下as-HPTed合金的显微组织和拉伸性能的演变。结果表明，HPT能有效地破碎和分散粗粒富铁金属间化合物。当铁含量低于0.75 wt%时，即使在325℃退火后，这些破碎的颗粒也不会变粗，并保持良好的分散性。此外，我们发现纳米级富铁/锰分散体通过齐纳钉钉抑制晶粒生长，并有助于应变硬化。这些协同效应使含铁量为0.3 wt%的275℃退火AA5182合金达到了~ 500 MPa的高强度和超过8%的均匀塑性应变。我们的观察结果强调了通过塑性变形的微结构工程在开发高性能、耐铁的再生变形铝合金中的关键作用。

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引用次数: 0

Overcoming strength-ductility dilemma in non-equiatomic FeNiCoCrSi high-entropy alloys: Effect of Si content on deformation behavior 非等原子FeNiCoCrSi高熵合金克服强度-延性困境：Si含量对变形行为的影响

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

Materials Science and Engineering: A

Pub Date : 2026-02-01 DOI: 10.1016/j.msea.2026.149821

Pengfei Wu , Kefu Gan , Dingshun Yan , Yong Zhang , Zhiming Li

This study systematically investigated the mechanical behaviors and microstructural features of non-equiatomic Fe_40-xNi₂₀Co₂₀Cr₂₀Si_x (x = 3, 5, 8, at.%) high-entropy alloys (HEAs), with the aim to disclose the Si effects on strength-ductility synergy and underlying deformation mechanisms. Results suggest a single face-centered cubic (FCC) structure in the three Si-containing HEAs. A desirable synergy of high strength and exceptional ductility is attained by increasing the Si content from 3 to 8 at.%. Accordingly, the highest values of yield strength (∼339 MPa), ultimate tensile strength (∼816 MPa) and total elongation (∼86.7 %) are achieved in the Fe₃₂Ni₂₀Co₂₀Cr₂₀Si₈. The partial substitution of Fe with Si increases the lattice friction in the FCC matrix, and the high Si concentration promotes the formation of abundant chemical short-range orders (CSROs). Moreover, the stacking fault energy (SFE) are decreased from 35 mJ/m² for Fe₃₇Ni₂₀Co₂₀Cr₂₀Si₃ to 18 mJ/m² for Fe₃₅Ni₂₀Co₂₀Cr₂₀Si₅ and further to 13 mJ/m² for Fe₃₂Ni₂₀Co₂₀Cr₂₀Si₈, promoting stacking faulting and twinning during plastic deformation and hence leading to increased strain hardening capability. Therefore, the increased lattice friction, multiplied CSROs and decreased SFE due to the increased Si concentration jointly contribute to the elevated strength-ductility synergy. The findings shed light on a promising approach for overcoming strength-ductility dilemma in HEAs via metalloid Si alloying.

本研究系统地研究了非等原子fe40 - xni20co20cr206 （x = 3,5,8, at）的力学行为和显微组织特征。%)高熵合金（HEAs），旨在揭示Si对强度-塑性协同效应的影响及其潜在的变形机制。结果表明，三种含硅HEAs均为单面心立方结构。通过将Si含量从3%增加到8%，可以获得高强度和卓越延展性的理想协同作用。因此，Fe32Ni20Co20Cr20Si8的屈服强度（~ 339 MPa）、极限抗拉强度（~ 816 MPa）和总伸长率（~ 86.7%）均达到最高值。Fe与Si的部分取代增加了FCC基体中的晶格摩擦，高浓度的Si促进了丰富化学短程序（csro）的形成。此外，层错能（SFE）从Fe37Ni20Co20Cr20Si3的35 mJ/m2降低到Fe35Ni20Co20Cr20Si5的18 mJ/m2，进一步降低到Fe32Ni20Co20Cr20Si8的13 mJ/m2，促进了塑性变形过程中的层错和孪晶，从而提高了应变硬化能力。因此，由于Si浓度的增加，晶格摩擦的增加、csro的增加以及SFE的降低共同促进了强度-延性协同效应的增强。这一发现揭示了一种很有希望的方法，通过类金属硅合金化来克服HEAs的强度-塑性困境。

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引用次数: 0

Multiphase-precipitation-induced heterostructure enables strength-ductility synergy in a CoCrNi-based multi-principal element alloy 多相析出诱导异质结构使cocrni基多主元素合金的强度-塑性协同作用得以实现

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

Materials Science and Engineering: A

Pub Date : 2026-02-01 DOI: 10.1016/j.msea.2026.149827

Cheng Jiang , Haibo Long , Qian Lv , Honghong Su , Xiaoran Zhao , Yixi Hou , Yaxi Ma , Dawei Pang , Shengcheng Mao , Ze Zhang , Xiaodong Han

The pursuit of high-performance multi-principal element alloys has long been constrained by the strength-ductility trade-off. Here, we propose a novel microstructural design strategy that achieves an exceptional balance by architecting a multi-scale, multi-phase heterogeneous microstructure in a CoCrNi-based multi-principal element alloy. This is realized through the synergistic incorporation of three distinct precipitates: coherent L1₂, incoherent σ, and Cr-rich body-centered cubic phases. These phases differ markedly in crystal structure, coherency, and chemical composition, enabling concurrent activation of multiple strengthening and deformation mechanisms at different scales, including Orowan strengthening, dislocation slip, heterogeneous deformation induced hardening, Lomer-Cottrell locks, stacking fault networks, and deformation twinning. The designed alloy achieves an excellent combination of mechanical properties with a yield strength of 1216 MPa, an ultimate tensile strength of 1528 MPa, and an elongation of 23 %. This work demonstrates that the deliberate integration of complementary precipitate architectures can effectively break classical mechanical property trade-offs, providing a generalizable microstructural design pathway for designing high-performance advanced structural materials.

长期以来，对高性能多主元素合金的追求一直受到强度-延性权衡的制约。在这里，我们提出了一种新的显微组织设计策略，通过在cocrni基多主元素合金中构建多尺度、多相异质显微组织来实现卓越的平衡。这是通过三种不同析出相的协同结合实现的：相干L12相、非相干σ相和富cr体心立方相。这些相在晶体结构、相干性和化学成分上存在显著差异，从而能够在不同尺度上同时激活多种强化和变形机制，包括Orowan强化、位错滑移、非均质变形诱发硬化、lomo - cottrell锁、层错网络和变形孪晶。该合金的屈服强度为1216 MPa，极限抗拉强度为1528 MPa，延伸率为23%，具有优异的综合力学性能。这项工作表明，有意整合互补沉淀结构可以有效地打破经典的力学性能权衡，为设计高性能先进结构材料提供了一种可推广的微观结构设计途径。

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引用次数: 0

Underlying mechanism for creep improvement of selective laser melted Ni-based superalloy IN738LC 选择性激光熔化镍基高温合金IN738LC蠕变改善的机理

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

Materials Science and Engineering: A

Pub Date : 2026-02-01 DOI: 10.1016/j.msea.2026.149789

H.Y. Song , Y. Yue , S. Wu , X.B. Hu , J.B. Liu , J. Zhu , A.J. Huang

Selective laser melting (SLM) shows great potential for fabricating complex Inconel 738LC (IN738LC) components. However, the creep resistance of SLM IN738LC alloy remains inferior compared to that of its cast counterparts, primarily due to an insufficient understanding of the operative deformation mechanisms and microstructure-property relationships. This knowledge gap currently constrains the turbine application of SLM IN738LC alloy. In the present work, the creep behaviour of SLM IN738LC alloy at a typical service temperature of 850 °C was systematically investigated. Compared to samples subjected to standard heat treatment (HT-1), those undergoing super-solvus treatment (HT-2) exhibited coarser grains, lower MC carbide density and reduced dislocation density. These microstructure features in HT-2 sample contributed to a fourfold increase in creep rupture life under a stress of 200 MPa. The dominant deformation mechanisms were identified as grain boundary sliding (GBS) and dislocation creep (DC), with their respective stress regimes established. Quantitative simulations were performed to assess the individual contributions of GBS and DC to the overall creep deformation rate. Systematic evaluation of microstructural influences revealed that grain size has the most pronounced effect, which suggests that increasing grain size markedly extends rupture life and reduces fracture strain.

选择性激光熔化（SLM）在制造复杂的Inconel 738LC （IN738LC）部件方面显示出巨大的潜力。然而，与铸态IN738LC合金相比，SLM IN738LC合金的抗蠕变性能仍然较差，这主要是由于对其有效变形机制和显微组织-性能关系的认识不足。这种知识差距目前制约了SLM IN738LC合金的涡轮应用。本文系统地研究了SLM IN738LC合金在850℃典型使用温度下的蠕变行为。与经过标准热处理（HT-1）的样品相比，经过超溶剂处理（HT-2）的样品表现出更粗的晶粒，更低的MC碳化物密度和更低的位错密度。这些微观结构特征使得HT-2试样在200 MPa应力下的蠕变断裂寿命增加了4倍。确定了晶界滑动（GBS）和位错蠕变（DC）的主要变形机制，并建立了各自的应力机制。进行了定量模拟，以评估GBS和DC对总体蠕变率的单独贡献。对显微组织影响的系统评价表明，晶粒尺寸的影响最为显著，表明增大晶粒尺寸可显著延长断裂寿命，降低断裂应变。

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引用次数: 0

Subsurface microstructure versus surface topography: Impact on the fatigue strength of stress-relieved Laser Powder Bed Fusion (L-PBF) 316L parts 亚表面微观结构与表面形貌：对应力消除激光粉末床熔化（L-PBF） 316L零件疲劳强度的影响

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

Materials Science and Engineering: A

Pub Date : 2026-01-29 DOI: 10.1016/j.msea.2026.149826

Marion Auffray , Linamaria Gallegos Mayorga , Franck Morel , Etienne Pessard , Thierry Baffie

The Laser Powder Bed Fusion (L-PBF) process allows to manufacture parts with both a complex geometry and a high mechanical performance. The as-built and net-shape L-PBF 316L stainless steel parts - i.e. without any heat nor surface treatment, have tensile residual stresses, subsurface pores, a rough surface and a contour-core microstructure that synergistically lead to a low fatigue strength. Residual stresses can be relieved with a heat-treatment to enhance the fatigue properties, but the best performance is obtained after machining and polishing. The differences between the polished and the heat-treated net-shape conditions lie in the subsurface microstructure, the surface topography, and the population of subsurface pores. This study aims to quantify the impact of each of these subsurface parameters on the fatigue behaviour. To do so, the subsurface microstructure of the net-shape condition is characterised. Then, uni-axial fatigue tests are carried out on stress-relieved specimens with the following surface conditions: net-shape, partially polished, and “machined and polished”. The Kitagawa-Takahashi representation shows that for defects smaller than

200 μ m

, the subsurface microstructure is the most influential parameter on the fatigue strength. Conversely, the surface topography has a limited influence. After examining the microstructure surrounding killer defects of both net-shape and polished specimens, the grain size under the surface of all surface conditions is considered in the Kitagawa-Takahashi diagram relatively to the killer defect size: this allows to align the various batches’ results.

激光粉末床融合（L-PBF）工艺允许制造具有复杂几何形状和高机械性能的零件。成品和净形的L-PBF 316L不锈钢部件-即未经任何热处理或表面处理，具有拉伸残余应力，表面下孔隙，粗糙表面和轮廓芯微观结构，这些协同作用导致低疲劳强度。热处理可以消除残余应力，提高材料的疲劳性能，但加工和抛光后的材料性能最好。抛光和热处理净形条件的区别在于地下微观结构、表面形貌和地下孔隙的数量。本研究旨在量化这些地下参数对疲劳行为的影响。为此，对净形条件下的地下微观结构进行了表征。然后，对去应力试样进行净形、部分抛光和“加工抛光”表面条件下的单轴疲劳试验。Kitagawa-Takahashi表示表明，对于小于200μm的缺陷，亚表面组织是影响疲劳强度最大的参数。相反，表面形貌的影响有限。在检查了净形和抛光试样的杀伤缺陷周围的微观结构后，在Kitagawa-Takahashi图中考虑了所有表面条件下的晶粒尺寸相对于杀伤缺陷尺寸：这允许对不同批次的结果进行对齐。

{"title":"Subsurface microstructure versus surface topography: Impact on the fatigue strength of stress-relieved Laser Powder Bed Fusion (L-PBF) 316L parts","authors":"Marion Auffray , Linamaria Gallegos Mayorga , Franck Morel , Etienne Pessard , Thierry Baffie","doi":"10.1016/j.msea.2026.149826","DOIUrl":"10.1016/j.msea.2026.149826","url":null,"abstract":"<div><div>The Laser Powder Bed Fusion (L-PBF) process allows to manufacture parts with both a complex geometry and a high mechanical performance. The as-built and net-shape L-PBF 316L stainless steel parts - i.e. without any heat nor surface treatment, have tensile residual stresses, subsurface pores, a rough surface and a contour-core microstructure that synergistically lead to a low fatigue strength. Residual stresses can be relieved with a heat-treatment to enhance the fatigue properties, but the best performance is obtained after machining and polishing. The differences between the polished and the heat-treated net-shape conditions lie in the subsurface microstructure, the surface topography, and the population of subsurface pores. This study aims to quantify the impact of each of these subsurface parameters on the fatigue behaviour. To do so, the subsurface microstructure of the net-shape condition is characterised. Then, uni-axial fatigue tests are carried out on stress-relieved specimens with the following surface conditions: net-shape, partially polished, and “machined and polished”. The Kitagawa-Takahashi representation shows that for defects smaller than <span><math><mrow><mn>200</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span>, the subsurface microstructure is the most influential parameter on the fatigue strength. Conversely, the surface topography has a limited influence. After examining the microstructure surrounding killer defects of both net-shape and polished specimens, the grain size under the surface of all surface conditions is considered in the Kitagawa-Takahashi diagram relatively to the killer defect size: this allows to align the various batches’ results.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"955 ","pages":"Article 149826"},"PeriodicalIF":7.0,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146070970","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 evolution in additively manufactured Ti-15%Nb-12%Zr alloy during plastic deformation over a wide range of strain up to 20,800 % 增材制造Ti-15%Nb-12%Zr合金在20,800 %应变范围内塑性变形过程中的组织演变

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

Materials Science and Engineering: A

Pub Date : 2026-01-27 DOI: 10.1016/j.msea.2026.149842

Kamilla Mukhtarova , Guy Dirras , Megumi Kawasaki , Csilla Kádár , Márk Windisch , Anita Heczel , Zoltán Dankházi , György Zoltán Radnóczi , Jenő Gubicza

The evolution of the microstructure during plastic deformation was studied in an additively manufactured Ti-15%Nb-12%Zr (at.%) alloy. The applied equivalent strain ranged extremely widely from 8 % to 20,800 %. Strains below 100 % were achieved by uniaxial compression, while the high strains were obtained by the high-pressure torsion (HPT) technique. In addition to the as-built material, the same investigation was conducted on the alloy after heat treatment at 550 °C for 1 h after additive manufacturing. The as-built alloy had a fully body-centered cubic structure, while the annealing step resulted in the development of a hexagonal close-packed secondary α-Ti phase with a fraction of about 10 %. Compression up to a strain of 70 % resulted in an increase in the secondary phase fraction to 12 % and 22 % for the as-built and heat-treated alloys, respectively. HPT processing at high strains yielded a lower secondary phase fraction due to reverse martensitic transformation. The dislocation density increased to 70–100 × 10¹⁴ m⁻² when the strain rose to 70 % during compression. The dislocation density reached extremely large values of 600–700 × 10¹⁴ m⁻² at a strain of about 20,800 % achieved by HPT. Although the dislocation density increased by two orders of magnitude and nanocrystallization also occurred when the strain increased to 20,800 %, the hardness was enhanced only by 10–30 %. The unexpectedly low hardness increase after HPT was attributed to unique deformation mechanisms such as the kink pair related dislocation motion and grain boundary sliding.

研究了增材制造Ti-15%Nb-12%Zr （at.%）合金塑性变形过程中的显微组织演变。应用的等效应变范围极为广泛，从8%到20,800 %。通过单轴压缩获得低于100%的应变，而高压扭转（HPT）技术获得高应变。除了成品材料外，还对增材制造后550°C热处理1 h的合金进行了相同的研究。在退火过程中，生成的合金具有完全的体心立方结构，而在退火过程中，形成了六方密排的次生α-Ti相，其含量约为10%。当应变达到70%时，合金的二次相分数分别增加到12%和22%。在高应变条件下，由于反向马氏体转变，HPT加工产生了较低的二次相分数。压缩过程中，当应变增加到70%时，位错密度增加到70 ~ 100 × 1014 m−2。在HPT应变为20,800 %时，位错密度达到了600-700 × 1014 m−2的极大值。当应变增加到20,800 %时，虽然位错密度增加了两个数量级，并且出现了纳米晶化，但硬度仅提高了10 - 30%。HPT后硬度的低增长是由于独特的变形机制，如扭结对相关的位错运动和晶界滑动。

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引用次数: 0