Materials Characterization最新文献_第7页

Contribution of Nb addition to ductility and corrosion resistance of 06Cr13 stainless steel after dual-phase annealing and in-situ tensile study on deformation-fracture mechanisms 添加Nb对双相退火后06Cr13不锈钢延展性和耐蚀性的贡献及变形断裂机制的原位拉伸研究

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2026-01-29 DOI: 10.1016/j.matchar.2026.116080

Jie Zhou , Xuelin Wang , Fanzhi Meng , Wei Zhang , Laisuo Ren , Gang Zhao , Zhenjia Xie , Chengjia Shang

This study focuses on optimizing the comprehensive performance of 06Cr13 ferritic stainless steel via trace Nb microalloying and dual-phase region annealing, systematically investigating the effects of Nb addition on ferrite/martensite microstructure ratio, strength-ductility balance and pitting corrosion resistance. In-situ tensile SEM and EBSD characterization were combined to clarify the deformation and fracture mechanisms of the ferrite/martensite duplex structure during plastic deformation. The results show that trace Nb addition broadens the dual-phase region, increasing ferrite content in Nb-bearing steel under the same heat treatment conditions, which induces a significant strength reduction but a remarkable elongation improvement. Meanwhile, Nb preferentially bonds with C to form precipitates, effectively inhibiting Cr depletion and enhancing pitting corrosion resistance. As the annealing temperature decreases from 900 to 800 °C, ferrite content increases progressively, accompanied by decreased strength and improved ductility. Mechanistically, synchronized coordinated deformation occurs between ferrite and martensite in Nb-bearing steel during tension, with cracks initiating at ferrite slip bands and phase interfaces; in contrast, Nb-free steel exhibits ferrite-dominated dislocation slip and martensite plastic limitation, leading to phase boundary strain concentration and the formation of localized large-sized smooth fracture features. This work demonstrates that synergistic control of trace Nb content and annealing process can realize the comprehensive regulation of strength, ductility and corrosion properties for this economical ferritic stainless steel, providing a novel technical approach for its performance optimization.

本研究主要通过微量Nb微合金化和双相区域退火对06Cr13铁素体不锈钢的综合性能进行优化，系统研究Nb添加对铁素体/马氏体组织比、强度-塑性平衡和抗点蚀性能的影响。结合原位拉伸SEM和EBSD表征，阐明了铁素体/马氏体双相组织在塑性变形过程中的变形和断裂机制。结果表明：在相同热处理条件下，微量Nb的加入使含Nb钢的双相区变宽，铁素体含量增加，强度显著降低，延伸率显著提高；同时，Nb优先与C结合形成沉淀，有效抑制了Cr的耗尽，提高了抗点蚀性。随着退火温度从900℃降低到800℃，铁素体含量逐渐增加，强度下降，塑性提高。力学上，铌钢中铁素体和马氏体在拉伸过程中发生同步协调变形，裂纹在铁素体滑移带和相界面处萌生；相反，无铌钢表现出铁素体为主的位错滑移和马氏体塑性限制，导致相界应变集中，形成局部大尺寸光滑断口特征。研究表明，通过控制微量铌含量和退火工艺的协同作用，可以实现经济铁素体不锈钢强度、延展性和腐蚀性能的综合调控，为铁素体不锈钢的性能优化提供了新的技术途径。

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引用次数: 0

Electrodeposited HEDP-based ultrafine-grained CuAg alloy foils with ultra-high strength and high conductivity 电沉积hedp基超细晶CuAg合金箔，具有超高强度和高导电性

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2026-01-29 DOI: 10.1016/j.matchar.2026.116093

Chun Yang , Bingtai Wen , Huijuan Shi , Xixi Wang , Zhiying Wang , Yixin Luo , Ke Xiao , Junfeng Wang , Xiaowei Fan , Ning Song , Yuhui Tan , Yunzhi Tang

Copper‑silver (CuAg) alloy foil has become a key material in the electronics and electrical sectors owing to its high electrical conductivity, excellent thermal dissipation properties, and favorable mechanical characteristics. To overcome the inherent trade-off between strength and conductivity in pure copper foil, this study employed a cyanide-free pyrophosphate-hydroxyethylidene diphosphonic acid (HEDP) mixed-ligand electrolyte to fabricate CuAg alloy foils with an ultrafine-grained structure via the electrodeposition method. An orthogonal experimental design was employed to optimize the process, and the effects of silver alloying and current density on the microstructure, mechanical properties, electrical conductivity, and corrosion behavior were systematically investigated. Research indicates that at pH = 10, temperature = 40 °C, and a current density of 0.7 A·dm⁻², alloy foil containing 8.78 wt% silver exhibits an ultra-high tensile strength of 1148 MPa, electrical conductivity of 71.8% IACS, and outstanding corrosion resistance. This is attributable to the addition of silver, which significantly refines the grain structure, suppresses twinning formation, promotes strong Cu(220) texture, and enhances surface smoothness and hydrophobicity. Microstructural analysis confirms a supersaturated solid solution with nanoscale Ag-rich second-phase particles. The ultra-high strength arises from the synergistic effects of grain refinement and solid solution strengthening. Electrochemical analysis indicates that the co-deposition is a diffusion-controlled, irreversible process following a three-dimensional instantaneous nucleation mechanism, as indicated by chronoamperometry fitted with the Scharifker-Hills model. This work provides a viable fabrication route and theoretical foundation for developing cyanide-free copper-based alloy foils with high strength, high conductivity, and excellent surface quality.

铜银（CuAg）合金箔由于其高导电性、优异的散热性能和良好的机械特性，已成为电子和电气领域的关键材料。为了克服纯铜箔强度和导电性之间的内在权衡，本研究采用无氰焦磷酸盐-羟乙基二膦酸（HEDP）混合配体电解质，通过电沉积法制备了具有超细晶结构的CuAg合金箔。采用正交试验设计对工艺进行优化，系统考察了银合金化和电流密度对合金组织、力学性能、电导率和腐蚀行为的影响。研究表明，在pH = 10、温度= 40℃、电流密度为0.7 a·dm−2的条件下，含银8.78 wt%的合金箔的抗拉强度为1148 MPa，电导率为71.8%，具有优异的耐腐蚀性。这是由于银的加入显著细化了晶粒结构，抑制了孪晶的形成，促进了强Cu（220）织构，提高了表面的光滑度和疏水性。显微结构分析证实了过饱和固溶体具有纳米级富银第二相颗粒。超高强度是晶粒细化和固溶强化协同作用的结果。电化学分析表明，共沉积是一个扩散控制的不可逆过程，遵循三维瞬时成核机制，符合Scharifker-Hills模型。为开发高强度、高导电性、高表面质量的无氰铜基合金箔提供了可行的工艺路线和理论基础。

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引用次数: 0

Effect of interlayer temperature on microstructural evolution and deformation mechanisms of high-manganese steel fabricated by wire arc additive manufacturing: An in-situ neutron diffraction study 层间温度对电弧增材制造高锰钢显微组织演变及变形机制的影响：原位中子衍射研究

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2026-01-29 DOI: 10.1016/j.matchar.2026.116077

Zhipeng Wu , Wenting Du , Xuan Sun , Jiahua Liang , Jiajian Huang , Dongyu Liu , Yansong Huang , Shuyan Zhang , Wei Zhang , Lijuan Zhang

The effect of interlayer temperature on the microstructure, mechanical property, and deformation mechanism of the high-manganese steel (HMnS) fabricated by the cold metal transfer (CMT) based wire arc additive manufacturing (WAAM) have been investigated. Two thin-walled parts were deposited at the interlayer temperatures of 100 °C and 300 °C, respectively. In addition to the commonly used characterization techniques of the optical microscopy (OM) and electron backscatter diffraction (EBSD), innovatively the in-situ neutron diffraction tensile tests were conducted to analyze the real-time evolution of the lattice strain, stacking fault probability (SFP) and the ratio of the full width at half maximum (FWHM) to the interplanar spacing d (qualitative dislocation density), so that a detailed insight into the deformation mechanism was revealed. The results showed that the lower interlayer temperature (100 °C) promoted a finer dendritic structure, higher dislocation density, and a strong 〈001〉 cubic texture. In contrast, the higher interlayer temperature (300 °C) resulted in coarser dendrites, a more random distribution of grain orientations, resulting in a reduced texture intensity. During deformation, the 100 °C sample exhibited dislocation slip as the dominant deformation mechanism, with limited twinning activity, leading to higher yield strength (

σ

_y) (389 MPa), but reduced total elongation (

ε

_total) (49%). The 300 °C sample demonstrated enhanced deformation twinning due to higher SFP and favorable grain orientations, forming a synergistic mechanism with dislocation slip. This contributed to superior ductility and a better strength-ductility balance. It can be concluded that the higher interlayer temperature (300 °C) promoted the plastic deformation ability of the WAAMed HMnS steel through developing the twinning-induced plasticity. The findings can provide a theoretical foundation for optimizing WAAM processes and enhancing the comprehensive performance of components.

研究了层间温度对基于冷金属转移（CMT）的丝弧增材制造（WAAM）制备的高锰钢（HMnS）组织、力学性能和变形机理的影响。两个薄壁件分别在层间温度为100℃和300℃下沉积。除了常用的光学显微镜（OM）和电子背散射衍射（EBSD）表征技术外，还创新地进行了原位中子衍射拉伸试验，分析了晶格应变、层错概率（SFP）和半最大全宽度（FWHM）与面间距d（定性位错密度）的实时演变，从而揭示了详细的变形机制。结果表明：较低的层间温度（100℃）有利于形成较细的枝晶组织、较高的位错密度和较强的< 001 >立方织构；相反，层间温度越高（300℃），枝晶越粗，晶粒取向分布越随机，织构强度降低。变形过程中，100℃下的变形机制以位错滑移为主，孪晶活性有限，屈服强度（σy）升高（389 MPa），但总伸长率（εtotal）降低（49%）。300°C时，由于较高的SFP和有利的晶粒取向，变形孪晶增强，与位错滑移形成协同机制。这有助于更好的延性和更好的强度-延性平衡。结果表明，较高的层间温度（300℃）通过发展孪晶诱导塑性促进了WAAMed HMnS钢的塑性变形能力。研究结果可为优化WAAM工艺，提高零部件综合性能提供理论依据。

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引用次数: 0

Long-term oxidation resistance of Mar-M247LC alloy at 900°C: Oxide layer stability and elemental diffusion Mar-M247LC合金900℃长期抗氧化性能：氧化层稳定性和元素扩散

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2026-01-29 DOI: 10.1016/j.matchar.2026.116092

Xin Li , Songlin Wang , Wanxia Wang , Bomou Zhou , Xiufang Gong , Zhenhuan Gao , Yanling Lu

The long-term oxidation behavior of Mar-M247LC superalloy was investigated at 900 °C for up to 10,000 h in air. During the initial 2000 h, oxidation kinetics followed a sub-parabolic relationship (

n

= 3.29,

kₚ

= 1.39 × 10⁻³ mg²·cm⁻⁴·h⁻¹), accompanied by continuous increases in mass gain and oxide layer thickness. At 2000 h, the alloy revealed a tri-layer oxide structure: an outer layer comprising NiO, Cr₂O₃, TiO₂ and NiCr₂O₄; an intermediate layer containing NiWO₄, WO₃, TiO₂, Ta₂O₅, and spinel phases (CrTaO₄ and NiAl₂O₄); and a continuous inner layer of Al₂O₃. Both the mass gain and the thickness of the oxide layer started to decrease after 2000 h, which was mainly attributed to the volatilization of W-containing oxides and porosity increase. Tungsten (W) was predominantly present within the intermediate white oxide layer as NiWO₄ and WO₃. Furthermore, accelerated volatilization of WO₃ ensued due to increased oxygen partial pressure resulting from oxide scale spallation, leading to its near-complete depletion from the intermediate layer. Throughout the oxidation process, the apparent diffusion coefficient of Al (

D_{Al}

) exhibited a declining trend, inversely correlating with the continuous increase in γ’ size. These findings underscore the profound implications of significant microstructural and kinetic evolution on the oxidation resistance of Mar-M247LC during prolonged high-temperature exposure.

研究了Mar-M247LC高温合金在900℃空气中长达10,000 h的长期氧化行为。在最初的2000 h内，氧化动力学遵循亚抛物线关系（n = 3.29, kₚ= 1.39 × 10−3 mg2·cm−4·h−1），伴随着质量增益和氧化层厚度的持续增加。在2000 h时，合金呈现三层氧化结构：外层由NiO、Cr2O3、TiO2和NiCr2O4组成；中间层包含NiWO4、WO3、TiO2、Ta2O5和尖晶石相（CrTaO4和NiAl2O4）；和连续的Al2O3内层。在2000 h后，氧化层的质量增加和厚度开始减小，这主要是由于含w氧化物的挥发和孔隙度的增加。钨(W)主要以NiWO4和WO3的形式存在于中间白色氧化层中。此外，氧化皮剥落引起的氧分压增加导致WO3的挥发加速，导致其几乎完全从中间层耗尽。在整个氧化过程中，Al （DAl）的表观扩散系数呈下降趋势，与γ′尺寸的不断增大呈负相关。这些发现强调了Mar-M247LC在长时间高温暴露过程中显著的微观结构和动力学演变对其抗氧化性的深远影响。

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引用次数: 0

Enhancing interfacial bonding and performance in Al/steel inertia friction welding via a Ni interlayer-induced mutual deformation Ni层间相互变形增强Al/钢惯性摩擦焊界面结合及性能

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2026-01-29 DOI: 10.1016/j.matchar.2026.116098

Hao Wang, Guoliang Qin, Hong Ma, Qian Zhao

The strength mismatch between aluminum alloys and steels in inertia friction welding (IFW) often leads to one-sided deformation and weak interfacial bonding, limiting the performance of dissimilar joints. In this study, a millimeter-scale Ni interlayer with intermediate strength was introduced to promote mutual deformation between Al alloy and steel during IFW. The influence of the interlayer on the interfacial microstructure, mechanical behavior, and corrosion performance was systematically investigated. Results show that the addition of the Ni interlayer transforms the deformation mode from one-sided to mutual, leading to intensified plastic flow and enhanced self-cleaning at the weld interface. Consequently, the oxide layer is effectively removed and replaced by a thin amorphous Al–Ni–O reaction layer, which facilitates metallurgical bonding. Dynamic recrystallization occurs in all three materials near the interface, producing refined and compatible microstructures. Compared with the conventional Al/steel joint, the Al/Ni/steel joint exhibits a smoother hardness gradient and up to 109.1% improvement in tensile strength. Moreover, the incorporation of a Ni interlayer effectively reduces the overall corrosion rate under the tested conditions, while not causing any pronounced deterioration in the corrosion resistance of the joint. This study reveals that introducing an intermediate-strength Ni interlayer enables mutual deformation and microstructural refinement, providing an effective strategy for tailoring interfacial structures and enhancing the performance of dissimilar alloy joints.

在惯性摩擦焊接中，铝合金与钢的强度不匹配往往导致单向变形和界面结合薄弱，限制了异种接头的性能。在本研究中，引入了一层中等强度的毫米级Ni中间层，以促进铝合金和钢在IFW过程中的相互变形。系统地研究了中间层对界面微观结构、力学行为和腐蚀性能的影响。结果表明：Ni中间层的加入使单侧变形模式转变为双向变形模式，增强了焊缝界面的塑性流动，增强了焊缝界面的自清洁能力；因此，氧化层被有效地去除，取而代之的是一个薄的非晶Al-Ni-O反应层，这有利于冶金结合。三种材料在界面附近都发生了动态再结晶，产生了精致和相容的微观结构。与常规Al/Ni/钢接头相比，Al/Ni/钢接头的硬度梯度更平滑，抗拉强度提高了109.1%。此外，在测试条件下，Ni中间层的掺入有效地降低了整体腐蚀速率，同时不会导致接头的耐腐蚀性明显下降。研究表明，引入中等强度的Ni中间层可以实现相互变形和微观组织细化，为定制界面结构和提高不同合金接头的性能提供了有效的策略。

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引用次数: 0

Discontinuous precipitation and associated strengthening effect in a Cu-25Ni-25Mn alloy Cu-25Ni-25Mn合金的不连续析出及其强化效应

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2026-01-28 DOI: 10.1016/j.matchar.2026.116091

Changyuan Wang , Haiping Zhong , Daogao Wu , Chenyang Zhou , Weibin Xie , Huiming Chen , Qiangsong Wang , Hang Wang

This study investigates the aging precipitation behavior of a Cu-25Ni-25Mn alloy, focusing on the strengthening effect induced by discontinuous precipitation (DP). The results have indicated that DP occurs at grain boundary during aging at 300 and 350 °C, leading to the formation of fibrous NiMn phases that preferentially grow along the 〈111〉_Cu direction. The NiMn and Cu phases in the DP colonies are characterized by the following crystallographic orientation relationship: (100)_NiMn//(100)_Cu and [011]_NiMn//[011]_Cu. Precipitation of the NiMn phase effectively strengthens the alloy during aging, where the strength is linearly increased with an increasing volume fraction of DP colonies. The alloy strength and hardness reach maximum values when the alloy undergoes full DP. The DP strengthening effect can account for over 75% of the yield strength, representing the dominant strengthening mechanism. The alloy aged at 350 °C exhibits faster DP kinetics and finer fibrous NiMn phases when compared with aging at 300 °C. The finer NiMn phases result in a greater DP strengthening effect at 350 °C, where the peak yield strength (∼1195 MPa) is higher than that achieved at 300 °C.

本文研究了Cu-25Ni-25Mn合金的时效析出行为，重点研究了不连续析出（DP）引起的强化效应。结果表明，在300℃和350℃时效过程中，晶界处发生DP，形成纤维状NiMn相，并优先沿< 111 > Cu方向生长。DP集落中的NiMn和Cu相具有如下的晶体取向关系：（100）NiMn//(100)Cu和[011]NiMn//[011]Cu。在时效过程中，NiMn相的析出有效地增强了合金的强度，强度随DP菌落体积分数的增加而线性增加。当合金经过全DP时，合金的强度和硬度达到最大值。DP强化效应占屈服强度的75%以上，是主要的强化机制。与300℃时效相比，350℃时效合金表现出更快的DP动力学和更细的纤维状NiMn相。在350°C时，更细的NiMn相产生了更大的DP强化效果，其中峰值屈服强度（~ 1195 MPa）高于300°C时的强度。

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引用次数: 0

Effects of Cr and Sb doping on the microstructure and magnetic properties for MnBi melt-spun alloys Cr和Sb掺杂对MnBi熔纺合金组织和磁性能的影响

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2026-01-28 DOI: 10.1016/j.matchar.2026.116083

X.Y. Cheng, Y.H. Hou, W.Y. Yu, X. Liu, J.P. Liu, W. Li, Y.L. Huang

The synthesis of high-content low-temperature phase (LTP) MnBi magnet remains challenging due to the persistent presence of residual phases resulting from the peritectic reaction. The effects of Cr and Sb single doping and co-doping on the phase composition, microstructure, and magnetic properties of MnBi alloys were investigated. The results demonstrate that Cr doping effectively enhances the formation capability of the MnBi phase, resulting in significant improvements in both coercivity and remanence. Sb doping induces notable grain refinement and facilitates the precipitation of the paramagnetic Bi₉Mn₁₀Sb phase. Moreover, the Sb dissolution in the LTP MnBi can enhance its magnetocrystalline anisotropy energy. CrSb co-doping combines the advantages of Cr and Sb single doping, enabling the (Mn_0.55Bi_0.45)₉₅Cr₄Sb₁ alloy to achieve the optimum comprehensive magnetic properties, with the coercivity of 489 kA/m and the remanence of 41 A·m²/kg. The elemental doping strategy employed in this experiment provides a practical guideline for the fabrication of MnBi magnets.

高含量低温相（LTP） MnBi磁体的合成仍然具有挑战性，因为包晶反应导致的残余相持续存在。研究了Cr和Sb单掺杂和共掺杂对MnBi合金相组成、显微组织和磁性能的影响。结果表明，Cr的掺杂有效地增强了MnBi相的形成能力，使得MnBi相的矫顽力和剩余力都得到了显著改善。Sb的掺入使晶粒细化，有利于顺磁性Bi9Mn10Sb相的析出。此外，Sb在LTP MnBi中的溶解可以提高其磁晶各向异性能。CrSb共掺杂结合了Cr和Sb单掺杂的优点，使（Mn0.55Bi0.45）95Cr4Sb1合金获得了最佳的综合磁性能，矫顽力为489 kA/m，剩余量为41 A·m2/kg。本实验采用的元素掺杂策略为MnBi磁体的制备提供了实用的指导。

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引用次数: 0

Interfacial reinforcement in AgCuTi-interlayered Cu/Nb composites: Mechanisms and heat treatment effects agcuti -层间Cu/Nb复合材料的界面增强：机理和热处理效果

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2026-01-27 DOI: 10.1016/j.matchar.2026.116079

Jianpeng Li , Yang Ye , Xiaogan Li , Li Wang , Shuai Wu , Ziqin Yang , Haidong Li , Guangze Jiang , Hangxu Li , Zepeng Jiang , Tao Liu , Lu Li , Feng Qiu , Sansan Ao , Junhui Zhang , Zhijun Wang , Yuan He

Reliable integration of high-thermal-conductivity copper (Cu) layers onto inert niobium (Nb) substrates is hindered by their poor interfacial compatibility, primarily due to the limited chemical reactivity of Nb. To overcome this challenge, a novel fabrication approach was developed by introducing a cold-sprayed AgCuTi interlayer combined with electroplated Cu deposition, enabling the formation of Cu/Nb composites with improved mechanical integrity and thermal performance. The interfacial strengthening mechanisms of the AgCuTi alloy layer and its microstructural evolution under various heat treatment conditions were systematically studied. Post-annealing at 850 °C resulted in significantly enhanced bonding strength and thermal conductivity. Density functional theory (DFT) calculations further revealed that Ti enhances chemical bonding at the Cu/Nb interface through charge redistribution and Ag-Ti/Nb-Ti orbital hybridization. Results reveal Ti-containing interlayers' capability to establish durable interfaces in Cu/Nb systems, offering practical guidance for joining inert metals in advanced thermal and structural applications.

高导热铜（Cu）层在惰性铌（Nb）衬底上的可靠集成受到其界面相容性差的阻碍，主要是由于铌的化学反应性有限。为了克服这一挑战，研究人员开发了一种新的制造方法，通过引入冷喷涂AgCuTi中间层结合电镀Cu沉积，使Cu/Nb复合材料的形成具有更好的机械完整性和热性能。系统研究了不同热处理条件下AgCuTi合金层的界面强化机制及其显微组织演变。850℃退火后，结合强度和导热系数显著提高。密度泛函理论（DFT）进一步揭示了Ti通过电荷重分配和Ag-Ti/Nb-Ti轨道杂化增强Cu/Nb界面化学键。结果表明含ti中间层能够在Cu/Nb体系中建立持久的界面，为在先进的热学和结构应用中连接惰性金属提供了实际指导。

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引用次数: 0

Distinctive ductility anisotropy induced by keyhole pores in Y2O3-reinforced high-temperature titanium alloy fabricated by additive manufacturing 增材制造y2o3增强高温钛合金锁眼气孔诱导的不同延性各向异性

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2026-01-27 DOI: 10.1016/j.matchar.2026.116070

Shun Liu , Ruiqi Guo , Menglu Wang , Hongzhi Niu , Wuxin Yang

This study systematically investigated the coupling effects of keyhole type pores (k-pores) and columnar structures on tensile anisotropy of electron beam powder bed fusion (EB-PBF) Y₂O₃-reinforced high-temperature titanium alloy. K-pores present adverse effects on ductility in transverse direction, while vertical ductility is the highest. Specifically, k-pores bring about a distinctive anisotropy: elongation is 9.1% and 2.7% in vertical and horizontal directions, with ultimate tensile strength (UTS) being 893 and 977 MPa, respectively. This tensile anisotropy is essentially attributed to the anisotropic stress fields around k-pores and the distinct non-uniformity of slipping deformation within individual columnar domains. This study provides deep insights into coupling effects of k-pores and columnar grain structures on mechanical anisotropy of EB-PBF high-temperature titanium alloys.

本研究系统地研究了锁孔型孔隙（k孔）和柱状结构对电子束粉末床熔合（EB-PBF） y2o3增强高温钛合金拉伸各向异性的耦合影响。k孔在横向上对延性有不利影响，而竖向延性最大。其中，k孔具有明显的各向异性：纵向伸长率为9.1%，横向伸长率为2.7%，极限抗拉强度（UTS）分别为893和977 MPa。这种拉伸各向异性主要归因于k孔周围的各向异性应力场和单个柱状域内滑动变形的明显不均匀性。本研究深入探讨了k孔和柱状晶粒结构对EB-PBF高温钛合金力学各向异性的耦合效应。

引用次数: 0

Grain boundary engineering-induced grain refinement and texture evolution in FeNiCoCrTi high-entropy alloys FeNiCoCrTi高熵合金晶界工程诱导的晶粒细化和织构演化

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization

Pub Date : 2026-01-27 DOI: 10.1016/j.matchar.2026.116082

Junhong Zhang , Lianning Li , Chunyu Zhao , Lei Zhang , Yongjiang Huang

This study systematically investigates the influence of trace Y additions on grain refinement mechanisms and texture evolution in the Fe₃₀Ni₃₀Co₂₅Cr₁₀Ti₅ high-entropy alloy. The results reveal a critical Y content at 0.3%. Below this threshold, Y-rich precipitates form within the alloy, exhibiting a semi-coherent interface with the matrix characterized by a lattice mismatch of 8.8%. These precipitates act as effective heterogeneous nucleation sites and simultaneously induce compositional undercooling, collectively promoting significant grain refinement and resulting in a weak, randomly oriented rotated cubic texture. Conversely, when the Y content exceeds the critical value (0.5%), excessive solute segregation causes substantial compositional undercooling, which facilitates the accelerated growth of a limited number of grains with preferred orientations. This leads to abnormal grain coarsening and the development of strong mixed Goss and Brass textures. By elucidating the combined effects of heterogeneous nucleation and compositional undercooling, this research highlights the pivotal role of Y addition in grain refinement within high-entropy alloys, providing a theoretical foundation for precise microstructural and performance optimization of these alloys through grain boundary engineering.

本研究系统地研究了微量Y添加对Fe30Ni30Co25Cr10Ti5高熵合金晶粒细化机制和织构演变的影响。结果显示，临界Y含量为0.3%。低于该阈值，合金内部形成富y析出相，与基体形成半共格界面，晶格失配率为8.8%。这些析出相作为有效的非均相形核位点，同时诱导组分过冷，共同促进显著的晶粒细化，形成弱的、随机取向的旋转立方织构。相反，当Y含量超过临界值（0.5%）时，过量的溶质偏析会导致组分过冷，从而促进有限数量的择优取向晶粒的加速生长。这导致晶粒异常粗化，形成强烈的高斯和黄铜混合织构。本研究通过阐明非均相形核和成分过冷的共同作用，强调了Y在高熵合金晶粒细化中的关键作用，为通过晶界工程对高熵合金进行精确的组织优化和性能优化提供了理论基础。

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引用次数: 0