Materials Science and Engineering: A最新文献_第4页

Achieving submicron grains in additively manufactured 304L-TiB2 metal matrix composite via in-situ reaction and Zener pinning 采用原位反应和齐纳钉扎法制备了亚微米级的304L-TiB2金属基复合材料

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

Materials Science and Engineering: A

Pub Date : 2025-12-06 DOI: 10.1016/j.msea.2025.149497

Wengang Zhai , Wei Zhou , Sharon Mui Ling Nai

Additive manufacturing enables the fabrication of metallic components with complex geometries and tailored properties. However, fusion-based additive manufacturing processes often lead to the formation of coarse columnar grains that span multiple build layers, limiting mechanical performance. In this study, laser powder bed fusion is employed to process 304L stainless steel, achieving significant grain refinement to ∼0.6 μm through the formation of in-situ boride precipitates. Thermodynamic simulations confirm that reactions between the 304L matrix and reactive elements lead to the formation of Fe- and Cr-rich borides, which segregate along grain boundaries and inhibit grain coarsening through boundary pinning mechanisms. In addition, solute effects from reaction byproducts further contribute to grain refinement. As a result, the yield strength at room temperature increases markedly from 454.7 MPa to 946.2 MPa and 1259.2 MPa with increased levels of reactive species. At 550 °C, high strength is maintained, with yield strengths of 643.2 MPa and 1030.4 MPa, respectively. These findings demonstrate the effectiveness of in-situ phase formation and boundary pinning in enhancing both room-temperature and elevated-temperature mechanical performance of additively manufactured steels.

增材制造能够制造具有复杂几何形状和定制特性的金属部件。然而，基于融合的增材制造工艺通常会导致形成跨越多个构建层的粗柱状晶粒，从而限制了机械性能。在本研究中，采用激光粉末床熔合处理304L不锈钢，通过原位硼化物沉淀的形成，晶粒细化到~ 0.6 μm。热力学模拟证实，304L基体与活性元素之间的反应导致富铁和富铬硼化物的形成，这些硼化物沿晶界偏析，并通过边界钉住机制抑制晶粒粗化。此外，反应副产物的溶质效应进一步有助于晶粒的细化。结果表明，随着反应物质含量的增加，室温屈服强度从454.7 MPa显著提高到946.2 MPa和1259.2 MPa。在550℃时，合金的屈服强度分别为643.2 MPa和1030.4 MPa。这些发现证明了原位相形成和边界钉住在提高增材制造钢的室温和高温力学性能方面的有效性。

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引用次数: 0

Surface radial crack-based fracture analysis of SiC ceramics under Vickers indentation SiC陶瓷在维氏压痕下的表面径向裂纹断裂分析

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

Materials Science and Engineering: A

Pub Date : 2025-12-06 DOI: 10.1016/j.msea.2025.149588

Kyeongsik Son , Donghyun Kim , Eunpyo Hong , Junghoon Lee , Wookjin Lee

We propose a method for evaluating the fracture strength of SiC ceramics using surface radial cracks created by Vickers indentation. Although standardized methods such as ASTM C1421 require pre-cracked specimens and complex machining, our approach provides a simpler alternative using controlled indentation-induced flaws. Artificial flaws, 40.0–86.6 μm in length, were introduced by indentation, and the fracture behavior was analyzed according to the crack orientation and its projection onto the tensile axis. Even under high loads producing subsurface half-penny cracks, fractures were consistently initiated at the tips of the surface radial cracks. Flexural strength increased with indenter rotation angle θ as the projected crack length decreased with cos θ. The flexural strength σ exhibited a σ ∝ 1/√a relationship with the projected surface crack length a (R² = 0.975), consistent with the classical Griffith–Irwin fracture model. These findings confirm that surface radial cracks can serve as artificial flaws and provide a potential complementary approach to existing standardized test methods for evaluating fracture toughness in ceramics.

我们提出了一种利用维氏压痕产生的表面径向裂纹来评估SiC陶瓷断裂强度的方法。尽管ASTM C1421等标准化方法需要预裂试样和复杂的加工，但我们的方法提供了一种更简单的替代方法，使用可控压痕引起的缺陷。通过压痕引入长度为40.0 ~ 86.6 μm的人工缺陷，并根据裂纹的取向及其在拉伸轴上的投影分析其断裂行为。即使在产生半便士地下裂缝的高载荷下，裂缝也始终是在表面径向裂缝的尖端开始的。抗折强度随压头旋转角度θ的增加而增加，而裂纹投影长度随cos θ的减小而减小。抗折强度σ与表面裂纹投影长度a呈σ∝1/√a关系（R2 = 0.975），符合经典Griffith-Irwin断裂模型。这些发现证实了表面径向裂纹可以作为人工缺陷，并为现有的评估陶瓷断裂韧性的标准化测试方法提供了潜在的补充方法。

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引用次数: 0

Stretch flangeability of hot-rolled Ti-Nb microalloyed steels containing tramp Cu, Sn and Sb 含Cu、Sn、Sb的热轧Ti-Nb微合金钢的拉伸翻边性

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

Materials Science and Engineering: A

Pub Date : 2025-12-06 DOI: 10.1016/j.msea.2025.149580

Ho Hyeong Lee , Chang Jae Yu , Jeongseok Kim , Sung-Il Kim , Dae Geon Lee , Heung Nam Han , Dong-Woo Suh

This study investigates the impact of tramp elements on the stretch flangeability of hot-rolled high-strength steels microalloyed with Ti and Nb. Two alloy systems - Ti-rich and Nb-rich - were designed to achieve similar tensile properties by varying Ti/Nb ratios, while systematically introducing tramp elements. Microstructural characterization revealed that Ti-rich alloys exhibited a higher population of coarse TiN precipitates. The Ti-rich alloys demonstrated lower hole expansion ratios (HER) than Nb-rich counterparts when holes were fabricated via mechanical punching, whereas this difference disappeared when wire-EDM was used, indicating that coarse TiN contributes significantly to damage generation during punching. The presence of tramp Sn and Sb further reduced HER, even in wire-EDM specimens, suggesting a detrimental effect on the intrinsic hole expansion property, which was led by surface segregation of the Sn and Sb. In addition, the tramp Sn and Sb have a propensity to segregate to TiN/matrix interface, ending up with exacerbation of the detrimental effect of TiN on the stretch flangeability of hole punched specimen. In contrast, Cu showed marginal segregation and negligible influence on HER.

本文研究了不稳定元素对Ti、Nb微合金化热轧高强钢拉伸可翻性的影响。两种合金体系——富钛和富铌——通过不同的Ti/Nb比率来获得相似的拉伸性能，同时系统地引入了不稳定元素。显微组织表征表明，富钛合金中有大量粗TiN析出。当采用机械冲孔时，富钛合金的孔膨胀率（HER）低于富铌合金，而当采用电火花加工时，这种差异消失，这表明粗TiN对冲孔过程中的损伤产生有重要影响。不均匀Sn和Sb的存在进一步降低了HER，即使在线切割样品中也是如此，这表明Sn和Sb的表面偏析导致了对固有孔扩展性能的不利影响。此外，不均匀Sn和Sb倾向于偏析到TiN/基体界面，最终加剧了TiN对穿孔样品拉伸可折性的不利影响。相比之下，Cu表现出边际偏析，对HER的影响可以忽略不计。

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引用次数: 0

Influence mechanism of drawing deformation on microstructure and properties of Cu-Cr-Zr alloy 拉伸变形对Cu-Cr-Zr合金组织和性能的影响机理

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

Materials Science and Engineering: A

Pub Date : 2025-12-05 DOI: 10.1016/j.msea.2025.149586

Xiangyun Han , Tao Huang , Xuebin Zhang , Chaomin Zhang , Wenjing Zhang , Dejiang Yu , Yizhe Xu , Ximeng Luo , Kexing Song

Cu-Cr-Zr alloy wires with varying deformation degrees were fabricated by cold drawing. The mechanism through which different levels of drawing deformation affect the microstructure and properties of the Cu-Cr-Zr alloy wires was systematically investigated. The results indicate that with increasing drawing deformation, the tensile strength of the alloy rises from 282 MPa to 444 MPa, while the electrical conductivity improves by 2.44 % IACS compared to the initial state. The grain morphology was significantly refined along the drawing direction, with the average grain size decreasing from 16.54 μm to 3.17 μm. The proportion of LAGBs gradually increased, and the alloy fiber texture with {001}∥X₀ direction gradually transformed into a fiber texture with {111}∥X₀ direction. During the drawing process, the dislocation density exhibited a progressive increase, resulting in the formation of dislocation tangles and well-defined dislocation walls. The finely dispersed precipitates effectively pin dislocations and grain boundaries, thereby contributing to the enhancement of the alloy's mechanical properties. This study elucidates the role of drawing deformation in modulating the microstructure and properties of Cu-Cr-Zr alloy, providing a theoretical basis and experimental guidance for the preparation of high-performance copper alloy wires.

采用冷拔法制备了不同变形程度的Cu-Cr-Zr合金线材。系统研究了不同拉伸变形程度对Cu-Cr-Zr合金丝组织和性能的影响机理。结果表明：随着拉伸变形量的增大，合金的抗拉强度从282 MPa提高到444 MPa，电导率比初始状态提高了2.44%。晶粒形貌沿拉伸方向明显细化，平均晶粒尺寸由16.54 μm减小到3.17 μm。lagb的比例逐渐增加，由{001}∥X0方向的合金纤维织构逐渐转变为{111}∥X0方向的纤维织构。在拉伸过程中，位错密度逐渐增大，形成位错缠结和明确的位错壁。细小分散的析出物有效地固定了位错和晶界，从而有助于提高合金的力学性能。本研究阐明了拉伸变形对Cu-Cr-Zr合金组织和性能的调节作用，为高性能铜合金线材的制备提供了理论依据和实验指导。

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引用次数: 0

Spinodal-assisted multiscale immiscibility enables superior strength–ductility synergy in (CuFeMnNi)96Al2Ti2 high-entropy alloy spinodal辅助多尺度非混相使（CuFeMnNi）96Al2Ti2高熵合金具有优异的强度-塑性协同作用

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

Materials Science and Engineering: A

Pub Date : 2025-12-05 DOI: 10.1016/j.msea.2025.149582

Shi Woo Lee , Hyojin Park , Rae Eon Kim , Jaehun Kim , Do Won Lee , Jae Heung Lee , Sun Ig Hong , Hyo-Sun Jang , Yoon-Uk Heo , Hyoung Seop Kim

In this study, a dual face-centered cubic (FCC) (CuFeMnNi)₉₆Al₂Ti₂ high-entropy alloy (HEA) was designed, in which multiscale immiscibility was deliberately engineered through a single-step aging treatment. Microscale Cu-rich/Fe-rich domains originated from the intrinsic immiscibility during solidification, and nanoscale spinodal compositional modulations (∼10 nm) subsequently developed within both domains. Synchrotron X-ray diffraction sidebands, selected area electron diffraction satellites, and scanning transmission electron microscopy line scans collectively provide compelling evidence for spinodal decomposition, consistent with the thermodynamic predictions. This coherent multiscale architecture promoted simultaneous heterogeneous deformation-induced strengthening and spinodal coherency strengthening. As a result, the yield strength increased by more than twofold (318 → 728 MPa) while maintaining a uniform elongation of ∼33%, achieving an ultimate tensile strength of ∼1128 MPa. Quantitative modeling partitioned the contributions from Hall–Petch, solid-solution, spinodal, and heterogeneous deformation-induced (HDI) strengthening, which closely matched the experimental results. Compared with previously reported Cu-containing HEAs, the current alloy demonstrated a superior strength–ductility synergy at a raw material cost of ∼6 $/kg, indicating that spinodal-assisted multiscale immiscibility is an effective strategy to overcome the strength–ductility trade-off in immiscible HEAs.

在本研究中，设计了一种双面心立方（FCC）（CuFeMnNi）96Al2Ti2高熵合金（HEA），通过单步时效处理有意设计了多尺度不混相。微尺度的富cu /富fe畴起源于凝固过程中固有的不混相，随后在这两个畴内发展出纳米尺度的旋量成分调制（~ 10 nm）。同步加速器x射线衍射边带、选定区域电子衍射卫星和扫描透射电子显微镜线扫描共同为spinodal分解提供了令人信服的证据，与热力学预测一致。这种相干的多尺度结构同时促进了非均质变形诱导强化和独立相干强化。结果，屈服强度提高了两倍以上（318→728 MPa），同时保持均匀伸长率为~ 33%，达到了~ 1128 MPa的极限拉伸强度。定量模型划分了Hall-Petch、固溶、spinodal和非均质变形诱导（HDI）强化的贡献，与实验结果非常吻合。与之前报道的含cu HEAs相比，目前的合金在原材料成本为6美元/公斤的情况下表现出了优越的强度-塑性协同作用，这表明spinodal辅助的多尺度非混相是克服非混相HEAs中强度-塑性权衡的有效策略。

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引用次数: 0

Ultrafine-grained heterogeneous nugget zone enables enhanced mechanical properties of friction stir welded CrMnFeCoNi high-entropy alloy 超细晶非均质熔核区提高了搅拌摩擦焊接crmnnfeconi高熵合金的力学性能

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

Materials Science and Engineering: A

Pub Date : 2025-12-05 DOI: 10.1016/j.msea.2025.149581

G.Q. Huang , B. Cheng , J.P. Hu , X.Y. Han , Z.H. Wang , J. Xu , T.H. Chou , T. Yang , F.Q. Meng , Z.K. Shen , X.M. Feng , Y.F. Shen

In this study, we employed water-cooling-assisted friction stir welding (FSW) to join CrMnFeCoNi high-entropy alloy (HEA), achieving an ultrafine-grained heterogeneous structure in the nugget zone (NZ) with excellent strength–ductility synergy. Microstructural analysis indicates that grain refinement during FSW is governed by both continuous and discontinuous dynamic recrystallization (CDRX and DDRX), with water cooling promoting DDRX and inhibiting grain growth. The transition zone between the base material (BM) and NZ exhibits partial recrystallization, leading to local strengthening by grain refinement and elevated dislocation density. This heterogeneous structure enables the joint to accommodate higher local strain in the BM during tensile loading, surpassing its yield strength while retaining significant ductility due to its superior strain-hardening capacity. The water-cooling-assisted FSW joint exhibits a yield strength of ∼317 MPa, an ultimate tensile strength of ∼606 MPa, and a uniform elongation of ∼53 %, achieving over 100 % joint efficiency. This simple yet effective approach offers a promising method for high-quality welding of CrMnFeCoNi HEA and potentially other FCC-based HEAs, advancing alloy joining technologies.

在本研究中，我们采用水冷辅助搅拌摩擦焊（FSW）连接crmnnfeconi高熵合金（HEA），在熔核区（NZ）获得了具有优异强度-塑性协同作用的超细晶非均质组织。显微组织分析表明，FSW过程中晶粒细化受连续和不连续动态再结晶（CDRX和DDRX）控制，水冷却促进了DDRX，抑制了晶粒长大。基材（BM）和NZ之间的过渡区表现出部分再结晶，导致晶粒细化和位错密度的局部强化。这种非均质结构使接头能够在拉伸加载期间适应BM中较高的局部应变，超过其屈服强度，同时由于其优越的应变硬化能力而保持显著的延性。水冷辅助FSW接头的屈服强度为~ 317 MPa，极限抗拉强度为~ 606 MPa，均匀伸长率为~ 53%，接头效率超过100%。这种简单而有效的方法为高质量焊接CrMnFeCoNi HEA和潜在的其他基于fcc的HEA提供了一种有前途的方法，推动了合金连接技术的发展。

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引用次数: 0

Enhancing the strength and ductility synergy of Ti matrix composites by forming core-shell heterostructured reinforcements 通过形成核壳异质结构增强材料来增强钛基复合材料的强度和延性协同效应

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

Materials Science and Engineering: A

Pub Date : 2025-12-05 DOI: 10.1016/j.msea.2025.149583

Y.Y. Tan , Q.S. Mei , Y. Ma , Z.H. Chen , L.Y. Liao , Y.Q. Peng , L.F. Bai , X. Luo , X.L. Wang , J.Y. Li

Regulating the spatial distribution of reinforcing phases is essential for improving the mechanical performance of metal matrix composites. In this study, we aimed to fabricate Ti matrix composites (TMCs) with core–shell structured (CSS) reinforcements to achieve a superior strength–ductility synergy. The composites were produced via reactive accumulative roll-bonding (RARB) of pure Ti and Al sheets. The resulting composites exhibits a heterogeneous microstructure, consisting of an α-Ti matrix and CSS reinforcements featuring a coarse-grained Ti₃Al core surrounded by a shell of α-Ti containing nano-sized Ti₃Al precipitates, separated from the matrix by a thin FCC-Ti interlayer. The CSS-TMCs demonstrate a yield strength of ∼888 MPa, an ultimate tensile strength of ∼1019 MPa and a fracture elongation of 11.4 %, outperforming conventional Ti-Al alloys and uniformly structured TMCs. This enhancement is attributed to the combined effects of the micro-sized Ti₃Al core, which provides strong load-bearing capacity, and the surrounding shell with nano-Ti₃Al precipitates, which mitigates strain localization. Our work proposes a viable heterogeneous microstructure strategy for advancing the mechanical properties of TMCs.

调节增强相的空间分布是提高金属基复合材料力学性能的关键。在这项研究中，我们的目标是制造具有核壳结构（CSS）增强的钛基复合材料（tmc），以实现卓越的强度-延性协同作用。采用反应累积滚接（RARB）法制备了纯钛和纯铝复合材料。复合材料具有非均质显微结构，由α-Ti基体和CSS增强材料组成，其中粗晶Ti3Al核心被含有纳米Ti3Al沉淀的α-Ti外壳包围，并被薄的FCC-Ti中间层与基体分离。css - tmc的屈服强度为~ 888 MPa，极限抗拉强度为~ 1019 MPa，断裂伸长率为11.4%，优于传统的Ti-Al合金和均匀组织的tmc。这种增强是由于具有强大承载能力的微尺寸Ti3Al芯和具有纳米Ti3Al沉淀的周围壳的共同作用，从而减轻了应变局部化。我们的工作为提高tmc的力学性能提供了一种可行的异质微观结构策略。

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引用次数: 0

Tailoring the microstructure and mechanical properties of laser-directed-energy-deposited IN738LC alloy via heat treatment 激光定向能沉积IN738LC合金热处理的微观组织和力学性能

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

Materials Science and Engineering: A

Pub Date : 2025-12-04 DOI: 10.1016/j.msea.2025.149573

Ho Seoung Kang , Ye Chan Sung , Seong-Moon Seo , Hyungsoo Lee , Hyoung Seop Kim , Jung Gi Kim

The additive manufacturing (AM) of IN738LC, a high-strength Ni-based superalloy, is limited by its inherent crack susceptibility because of its high Al and Ti contents. In this study, crack-suppressed IN738LC components were fabricated via laser-directed energy deposition (DED) using a reduced laser power (300–600 W) and a small beam diameter (0.8 mm), thereby minimizing heat-affected zones. Post-heat treatments were systematically applied, including direct aging (DA), partial (2STEP), and full (3STEP) solution treatments, to investigate their impact on the microstructural evolution and mechanical performance. Electron-backscatter diffraction, transmission electron microscopy, and energy dispersive X-ray spectroscopy analyses revealed that the γ′ precipitate size and M₂₃C₆ carbide distribution were highly sensitive to the degree of homogenization. The use of DA formed ultrafine γ′ precipitates and the highest M₂₃C₆ fraction, resulting in a high yield strength (1322.68 MPa at 25 °C) and creep resistance (1109 h at 850 °C) but limited ductility. In contrast, the 3STEP treatment promoted an equiaxed grain morphology and coarsened γ′ precipitates, yielding improved ductility (5.3 %) with moderate strength. These findings demonstrate that precise thermal management during and after DED processing enables both microstructural control and crack suppression in IN738LC alloy, optimizing both tensile and creep properties for high-temperature structural applications.

IN738LC是一种高强度镍基高温合金，由于其高Al和Ti含量，其固有的裂纹敏感性限制了增材制造技术的发展。在本研究中，采用激光定向能量沉积（DED）技术，使用较低的激光功率（300-600 W）和较小的光束直径（0.8 mm）制备了裂纹抑制IN738LC组件，从而最大限度地减少了热影响区。采用直接时效（DA）、部分固溶（2STEP）和完全固溶（3STEP）三种热处理方法，研究其对合金显微组织演变和力学性能的影响。电子后向散射衍射、透射电镜和能量色散x射线能谱分析表明，γ′析出物尺寸和M23C6碳化物分布对均匀化程度高度敏感。使用DA形成了超细γ′相和最高的M23C6分数，导致高屈服强度（25°C时为1322.68 MPa）和抗蠕变（850°C时为1109 h），但塑性有限。相比之下，3STEP处理促进了等轴晶粒形貌和粗化的γ′析出，提高了韧性（5.3%），强度中等。这些发现表明，在DED过程中和之后进行精确的热管理，可以实现IN738LC合金的微观组织控制和裂纹抑制，从而优化高温结构应用的拉伸和蠕变性能。

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引用次数: 0

Mechanical behavior of Al6061 produced by laser powder bed fusion: Effects of heat treatments and strain rates 激光粉末床熔合Al6061的力学行为：热处理和应变速率的影响

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

Materials Science and Engineering: A

Pub Date : 2025-12-04 DOI: 10.1016/j.msea.2025.149574

Burak Yilmaz, Haoyang Li, Faezeh Hosseini, Mostafa Yakout, James D. Hogan

Al6061 is an important structural alloy, but its processing by additive manufacturing (AM) is challenging due to high porosity and cracking susceptibility. In this study the effects of heat treatment (direct aging (DA), annealing, T6, and hot isostatic pressing (HIP)) and strain rate on the microstructure and mechanical behavior of porous PBF-LB Al6061 were investigated. Split-Hopkinson pressure bar (SHPB) was used in dynamic compression experiments at strain rates from 5x10² to 1.8x10³ s⁻¹, while quasistatic tests performed at strain rates 1x10⁻⁴ and 1x10⁻³ s⁻¹. Microstructural analyses revealed that as-built and all heat-treated conditions had significant porosity (∼3.5–5 %), and there were no consistent changes in grain size or texture. Microhardness and compression tests showed that as built and DA specimens had the highest hardness and flow stresses. In contrast, annealed, T6, and HIP conditions caused softening, and HIP specimens showed the lowest strengths. Under dynamic compression, all specimens exhibited increased flow stress compared to quasistatic loading, with strain rate sensitivities ranging from 12 % in the as built to 27 % in annealed specimens. In addition, all specimens had lower Poisson's ratio under dynamic loading compared to quasistatic loading. These findings show the limited effectiveness of conventional post-processing strategies in eliminating porosity or improving strength in PBF-LB Al6061.

Al6061是一种重要的结构合金，但由于其高孔隙率和高裂纹敏感性，增材制造（AM）工艺具有挑战性。研究了直接时效（DA）、退火、T6和热等静压（HIP）等热处理工艺和应变速率对多孔PBF-LB Al6061微观组织和力学行为的影响。采用Split-Hopkinson压杆（SHPB）进行应变率为5x102 ~ 1.8x103 s−1的动态压缩实验，应变率为1x10−4和1x10−3 s−1的准静态实验。显微结构分析显示，在建造和所有热处理条件下都有显著的孔隙率（~ 3.5 - 5%），并且晶粒尺寸或织构没有一致的变化。显微硬度和压缩试验表明，as和DA试样具有最高的硬度和流动应力。相比之下，退火、T6和HIP条件会导致软化，且HIP试样的强度最低。在动态压缩下，与准静态加载相比，所有试样都表现出增加的流动应力，应变率敏感性从原状的12%到退火试样的27%不等。此外，所有试件在动加载下的泊松比均低于准静态加载。这些发现表明，传统的后处理策略在消除PBF-LB Al6061的孔隙度或提高强度方面的有效性有限。

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引用次数: 0

The development of the novel Al-Mg-Sc-Zr-Ag alloy: Achieving corrosion resistance-strength synergy via optimized processing routes 新型Al-Mg-Sc-Zr-Ag合金的开发：通过优化工艺路线实现耐蚀-强度协同

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

Materials Science and Engineering: A

Pub Date : 2025-12-03 DOI: 10.1016/j.msea.2025.149563

Xinru Shao , Cheng Guo , Haoshang Liu , Jianxin Hu , Haitao Zhang , Zibin Wu , Hiromi Nagaumi

This study elucidates the mechanisms underlying the simultaneous enhancement of corrosion resistance and mechanical properties in an Al-5.02Mg-0.21Sc-0.11Zr-0.67Ag (wt%) alloy achieved through optimized thermomechanical processing. In comparison with the conventional T6 process (solution treatment at 500 °C/2 h + artificial aging at 180 °C/36 h), the P-T8 process (solution treatment at 500 °C/2 h + pre-aging + pre-deformation + artificial aging at 150 °C/36 h) enhances both strength and corrosion resistance through synergistic interactions between dislocations and nanoscale precipitates. Remarkably, the non-recrystallization annealing (350 °C/4 h NRA) process implemented after cold rolling not only strengthens the alloy via uniform precipitation of nanoscale Al₃(Sc, Zr) particles, but also improves corrosion resistance by completely suppressing grain boundary precipitation while generating high-density dislocation cells and low-angle grain boundaries (LAGBs). Compared to the corrosion depths of the P-T8 alloy (23.45 μm) and the T6 alloy (44.63 μm), the corrosion depth of the NRA-treated alloy was significantly reduced, at only 5.51 μm. The NRA-processed alloy maintains competitive mechanical properties, with yield strength, ultimate tensile strength, and elongation reaching 251.2 MPa, 368.86 MPa, and 9.22 %, respectively. This work provides a novel method and theoretical basis for achieving corrosion resistance–strength synergy in aluminum alloys.

本研究阐明了Al-5.02Mg-0.21Sc-0.11Zr-0.67Ag （wt%）合金通过优化的热处理工艺同时提高耐蚀性和力学性能的机制。与传统的T6工艺（500°C/2 h固溶处理+ 180°C/36 h人工时效）相比，P-T8工艺（500°C/2 h固溶处理+预时效+预变形+ 150°C/36 h人工时效）通过位错和纳米级析出物之间的协同相互作用提高了强度和耐腐蚀性。值得注意的是，冷轧后进行的非再结晶退火（350℃/4 h NRA）工艺不仅通过均匀析出纳米级Al3（Sc, Zr）颗粒来强化合金，而且通过完全抑制晶界析出而产生高密度位错胞和低角度晶界（lagb）来提高合金的耐蚀性。与P-T8合金（23.45 μm）和T6合金（44.63 μm）的腐蚀深度相比，经nra处理的合金的腐蚀深度明显减小，仅为5.51 μm。经nra处理后，合金的屈服强度、极限抗拉强度和伸长率分别达到251.2 MPa、368.86 MPa和9.22%，具有较好的力学性能。本研究为实现铝合金耐蚀-强度协同提供了新的方法和理论依据。

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引用次数: 0