Intermetallics最新文献_第6页

AlFeCuCrNi high-entropy alloy-derived intermetallics and T6 heat treatment: Influence on microstructure and wear of Al6061 matrix composites AlFeCuCrNi高熵合金衍生的金属间化合物和T6热处理：对Al6061基复合材料组织和磨损的影响

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-02-01 Epub Date: 2025-12-09 DOI: 10.1016/j.intermet.2025.109126

Amirhosein Ghadimyari, Farshad Akhlaghi

In this study, AlFeCuCrNi high-entropy alloy (HEA) particles were added in varying volume fractions to aluminum 6061 alloy powder as reinforcement, and composites were fabricated via the powder metallurgy method. Initially, the HEA particles were synthesized by mechanical alloying of equiatomic elemental powders for 20 h. These particles were then mixed with Al 6061 powder in different proportions. After compaction and sintering at 610 °C, the optimized sample underwent T6 heat treatment. During the sintering process at a relatively high temperature, the HEA particles interacted with the aluminum matrix and dissolved, resulting in the formation of various intermetallic phases that acted as the primary strengthening agents in the final composite. The produced samples were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), hardness testing, and porosity evaluation, and results compared to a reference sample. Furthermore, the specific wear rate and coefficient of friction of the samples were assessed using the pin-on-disk wear test. The sample containing 8 vol% HEA exhibited the best overall performance, showing a 112 % increase in macrohardness, a 95 % reduction in specific wear rate, and a 63 % reduction in the coefficient of friction compared to the reference sample. The effect of solutionizing temperature during heat treatment was also investigated. Results confirmed that a solutionizing temperature of 555 °C for the composite with 8 vol% HEA yielded a 64 % increase in macrohardness and a 38 % decrease in specific wear rate compared to the non-heat-treated composite.

本研究将不同体积分数的AlFeCuCrNi高熵合金（HEA）颗粒加入到6061铝合金粉末中作为增强剂，通过粉末冶金法制备复合材料。首先，通过机械合金化等原子元素粉末20 h合成HEA颗粒，然后将这些颗粒与Al 6061粉末按不同比例混合。优化后的样品在610℃压实烧结后，进行T6热处理。在较高温度的烧结过程中，HEA颗粒与铝基体相互作用并溶解，形成各种金属间相，这些金属间相是最终复合材料的主要强化剂。利用扫描电子显微镜（SEM）、x射线衍射（XRD）、硬度测试和孔隙度评估对制备的样品进行了表征，并将结果与参考样品进行了比较。此外，采用销盘磨损试验评估了样品的比磨损率和摩擦系数。含8 vol% HEA的样品表现出最佳的综合性能，与参考样品相比，宏观硬度提高了112%，比磨损率降低了95%，摩擦系数降低了63%。研究了热处理过程中固溶温度的影响。结果证实，与未经热处理的复合材料相比，当固溶温度为555℃时，复合材料的宏观硬度提高64%，比磨损率降低38%。

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引用次数: 0

Effect of solution heat treatment on microstructures and tensile properties of K447A Ni-based superalloy 固溶热处理对K447A镍基高温合金组织和拉伸性能的影响

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-02-01 Epub Date: 2025-12-09 DOI: 10.1016/j.intermet.2025.109093

Guangxian Lu , Tingting Zhao , Chengjiang Zhang , Zhixun Wen , Zhufeng Yue

The microstructural evolution and tensile properties of K447A Ni-based superalloy under varying solution heat treatment temperatures (sub-solvus to super-solvus) were systematically investigated through combined experimental characterization (SEM, TEM, EBSD) and crystal plasticity finite element modeling (CPFEM). The increasing of solution temperature (1185–1230 °C) promotes dissolution of primary γ' (γ′_p) while enhancing the volume fraction of cubic secondary γ' (γ′_s) precipitates, thereby improving yield strength. The sample solution-treated near the γ′ solvus temperature (1202–1203 °C), achieved a synergistic improvement of strength and ductility due to tri-modal γ′ distribution (γ′_p + γ′_s + γ′_t) and refined grain boundary carbides. The MC carbides dissolved and decomposed into M₆C carbides during solution. CPFEM simulations further validated that grain boundary carbides enhance stress-strain compatibility, promote intragranular plasticity and pin the slip of grain boundaries, which inhibit intergranular cracking. However, excessive solution temperatures (1230 °C) led to carbide depletion and continuous intergranular crack propagation, which degrades ductility. These findings provide a microstructure-guided framework for optimizing heat treatment regimes in K447A superalloys to achieve tailored strength-ductility synergies for high-temperature applications.

通过实验表征（SEM、TEM、EBSD）和晶体塑性有限元模拟（CPFEM）相结合的方法，系统研究了不同固溶热处理温度（亚溶剂到超溶剂）下K447A镍基高温合金的显微组织演变和拉伸性能。升高溶液温度（1185 ~ 1230℃）促进初生γ′（γ′p）的溶解，同时提高立方次生γ′（γ′s）析出相的体积分数，从而提高屈服强度。在γ′溶剂温度（1202 ~ 1203℃）附近进行固溶处理的样品，由于γ′分布（γ′p + γ′s + γ′t）和细化的晶界碳化物，实现了强度和塑性的协同提高。MC碳化物在溶解过程中溶解分解为M6C碳化物。CPFEM模拟进一步验证了晶界碳化物增强应力-应变相容性，促进晶内塑性，抑制晶界滑移，从而抑制晶间裂纹。然而，过高的溶解温度（1230℃）会导致碳化物耗尽和连续的晶间裂纹扩展，从而降低塑性。这些发现为优化K447A高温合金的热处理方案提供了微观结构指导框架，以实现高温应用中量身定制的强度-塑性协同效应。

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引用次数: 0

Confusion and comment on “First-principle study on structural, elastic and electronic properties of rare-earth intermetallic compounds: TbCu and TbZn” by Singh et al. [Intermetallics 19 (2011) 1359–1366] 对Singh等人“稀土金属间化合物TbCu和TbZn的结构、弹性和电子性质的第一性原理研究”的困惑和评论[intermetallic ics 19 (2011) 1359-1366]

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-02-01 Epub Date: 2025-12-11 DOI: 10.1016/j.intermet.2025.109115

D.S. Yadav

In the present report, we comment and discuss on the work previously published by Singh et al. in Intermetallics 19 (2011) 1359–1366. We are confused to their computational analysis for Debye temperature of rare earth Tb(Cu, Zn) intermetallic solids. Regrettably, after reviewing and examining their work deeply, we explored a certain numeric imperfection present in the average sound velocity (V_m) of TbCu by LDA function and Debye temperature of both selected rare earth intermetallics TbCu & TbZn, which are crystallizing in (B2-phase) the body centered cubic CsCl-structure, discussed by Singh et al. (2011) [1]. These numeric perturbations in the results for such parameters of selected rare earth intermeteallic compounds impale us to upgrade them carefully. Therefore, we upgrade the results for Debye temperature of TbCu and TbZn on removing the numerical perturbations present in such aforementioned parameters and re-examined all the data using the appropriate relations, depend upon the structural parameters and the elastic constants (B and G) reported by Singh et al. (2011) [1]. The results for Debye temperature of TbCu and TbZn reported by Singh et al.’s (Singh et al., 2011) [1] show a very large significant deviation (65.095 ≥ δ ≥ 64.148 %) from our investigations. Thus, our rectified outcomes are responsible to recover the accuracy of the results discussed by Singh et al. (2011) [1]. In view to this, scientifically, the publication of this comment in Intermetallics will be very reliable and valuable.

在本报告中，我们对Singh等人在intermetallic 19(2011) 1359-1366上发表的工作进行了评论和讨论。我们对他们对稀土Tb（Cu, Zn）金属间固体的德拜温度的计算分析感到困惑。遗憾的是，在深入回顾和检查了他们的工作之后，我们发现，在选定的两种稀土金属间化合物TbCu和TbZn的LDA函数和Debye温度中，TbCu的平均声速（Vm）存在一定的数值缺陷，这两种稀土金属间化合物TbCu和TbZn在（b2相）体心立方铯结构中结晶，Singh etal .(2011)[1]。所选稀土金属间化合物的这些参数在结果中的数值扰动促使我们谨慎地对其进行升级。因此，我们升级了TbCu和TbZn的德拜温度结果，消除了上述参数中存在的数值扰动，并使用适当的关系重新检查了所有数据，依赖于Singh等人（2011）报告的结构参数和弹性常数（B和G）[1]。Singh et al. (Singh et al., 2011)[1]报道的TbCu和TbZn的Debye温度结果与我们的研究结果有很大的显著偏差（65.095≥δ≥64.148%）。因此，我们修正后的结果有责任恢复Singh等人（2011）讨论的结果的准确性。鉴于此，从科学上讲，这一评论在《金属间化合物》杂志上发表将是非常可靠和有价值的。

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引用次数: 0

Unraveling thermal evolution and anisotropy in BCC TiVNbMo high entropy alloy via in situ XRD and first-principles simulations 通过原位XRD和第一性原理模拟，揭示BCC TiVNbMo高熵合金的热演化和各向异性

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-02-01 Epub Date: 2025-11-27 DOI: 10.1016/j.intermet.2025.109092

S.A. Uporov , V.S. Gaviko , V.G. Pushin , L.A. Cherepanova , E.O. Khazieva , V.A. Bykov , N.N. Katkov , R.E. Ryltsev

The foundational concept of high-entropy alloys (HEAs) posits that enhanced configurational entropy serves as the dominant factor stabilizing single-phase solid solutions in concentrated metallic systems. However, extensive experimental studies reveal significant contradictions to this paradigm — the presence of multiple constituent elements neither guarantees single-phase formation nor ensures exceptional thermal stability. These alloys, typically synthesized via arc-melting techniques, actually represent metastable high-temperature phases that exhibit instability under varying thermal conditions. Despite their metastable nature, such non-equilibrium crystalline structures demonstrate remarkable functional properties compared to conventional materials, driving substantial interdisciplinary research interest from both fundamental and applied perspectives. Prior to practical implementation, comprehensive thermal characterization across wide temperature ranges becomes essential to evaluate their structural integrity and potential functionality. This investigation systematically examines thermal evolution and crystalline anisotropy effects in the body-centered cubic (BCC) phase of TiVNbMo HEA through complementary approaches: in situ high-temperature X-ray diffraction experiments and advanced first-principles atomistic simulations employing graph neural network-based universal interatomic potentials. Our results demonstrate that the quenched BCC structure remains stable only up to 770 K, beyond which the alloy undergoes successive structural transformations. A particularly significant finding concerns anomalous anisotropic thermal expansion behavior of the BCC phase along different crystallographic axes. This unexpected phenomenon in a cubic system arises from the combined effects of lattice defectivity and pronounced elastic anisotropy, which likely contribute to the material’s thermal instability. Using a semi-quantitative model that combines quasi-harmonic lattice dynamics with anharmonic contributions of higher order, we demonstrate that elastic softness directly enhances thermal expansion along specific crystallographic axes. These observations provide new insights into the fundamental relationships between structural defects, elastic anisotropy, and thermal stability in complex concentrated alloys.

高熵合金（HEAs）的基本概念假定，在浓金属体系中，增强的构型熵是稳定单相固溶体的主要因素。然而，大量的实验研究揭示了这一范式的重大矛盾——多种组成元素的存在既不能保证单相形成，也不能保证特殊的热稳定性。这些合金通常通过电弧熔炼技术合成，实际上代表了亚稳高温相，在不同的热条件下表现出不稳定性。尽管具有亚稳态性质，但与传统材料相比，这种非平衡晶体结构表现出显著的功能特性，从基础和应用的角度推动了大量跨学科研究的兴趣。在实际应用之前，在广泛的温度范围内进行全面的热表征对于评估其结构完整性和潜在功能至关重要。本研究系统地研究了TiVNbMo HEA体心立方（BCC）相的热演化和晶体各向异性效应，通过互补的方法：原位高温x射线衍射实验和基于图神经网络的通用原子间势的先进第一性原理原子模拟。结果表明，淬火后的BCC组织仅在770 K时保持稳定，超过770 K后合金会经历连续的组织转变。一个特别重要的发现是关于BCC相沿不同结晶轴的反常各向异性热膨胀行为。这种意想不到的现象在立方系统中是由晶格缺陷和明显的弹性各向异性的共同作用引起的，这可能导致材料的热不稳定性。利用结合准调和晶格动力学和高阶非调和贡献的半定量模型，我们证明了弹性柔软性直接增强了沿特定晶体轴的热膨胀。这些观察结果为复杂浓缩合金的结构缺陷、弹性各向异性和热稳定性之间的基本关系提供了新的见解。

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引用次数: 0

Evolution of oriented lamellar microstructure and tensile properties of Ti-48Al-2Cr-2Nb alloy fabricated by vacuum twin-roll strip casting 真空双辊带铸Ti-48Al-2Cr-2Nb合金取向层状组织演变及拉伸性能

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-02-01 Epub Date: 2025-12-18 DOI: 10.1016/j.intermet.2025.109130

Chengran Chai , Yang Wang , Lin Peng , Shuai Zhao , Yuanxiang Zhang , Feng Fang , Xiaoming Zhang

TiAl alloy is a lightweight structural material with excellent high-temperature resistance, demonstrating significant potential for applications within the 600–900 °C range. However, its widespread adoption has been hindered by inadequate room-temperature ductility and a limited thermomechanical processing window. In this work, near net shape vacuum twin-roll strip casting(TRSC) technology was employed to fabricate Ti-48Al-2Cr-2Nb alloy, offering a novel approach to enhance the workability of TiAl alloys. Benefiting from the directional solidification and sub-rapid solidification characteristics of TRSC, the alloy exhibited strong preferred orientations of (111)γ and (0001)α₂, enhancing its plastic deformation capability. Furthermore, the average lamellar spacing was approximately 285 nm, with lamellar interfaces nearly parallel to the rolling direction (0–10° relative to the RD). The ultra-fine lamellar structure significantly improved the strength of the alloy. Tensile tests revealed that the room temperature strength reached 721 ± 19 MPa. When deformed at 850 °C, the fracture mode transitions from brittle fracture to ductile fracture, resulting in an excellent combination of elongation (31.2 ± 2.2 %) and tensile strength (402 ± 22 MPa). This study provides a promising way to improve the workability of TiAl alloy, which promotes the application of thin-sheet components.

TiAl合金是一种轻质结构材料，具有优异的耐高温性能，在600-900°C范围内显示出巨大的应用潜力。然而，它的广泛采用受到室温延展性不足和有限的热机械加工窗口的阻碍。采用近净形真空双辊带材铸造（TRSC）技术制备Ti-48Al-2Cr-2Nb合金，为提高TiAl合金的可加工性提供了一条新途径。利用TRSC的定向凝固和亚快速凝固特性，合金表现出较强的(111)γ和(0001)α2取向，增强了塑性变形能力。此外，平均片层间距约为285 nm，片层界面几乎平行于轧制方向（相对于RD 0-10°）。超细层状组织显著提高了合金的强度。拉伸试验表明，室温强度达到721±19 MPa。在850℃下变形时，断裂模式由脆性断裂转变为韧性断裂，获得了良好的伸长率（31.2±2.2%）和抗拉强度（402±22 MPa）的组合。该研究为提高TiAl合金的可加工性提供了一条有希望的途径，从而促进了薄板件的应用。

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引用次数: 0

Separating the effect of athermal and isothermal ω on superelasticity in Ti-24Nb (at.%) 分离非热和等温ω对Ti-24Nb （at.%）超弹性的影响

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-02-01 Epub Date: 2025-12-13 DOI: 10.1016/j.intermet.2025.109129

C.E.P. Talbot , N.L. Church , E.M. Hildyard , L.D. Connor , S. Michalik , N.G. Jones

Superelastic metastable β-Ti alloys, which undergo a stress-induced β → α″ transformation, have attracted significant attention in the biomedical and aerospace sectors. However, difficulty in predicting and controlling their superelastic properties, which is often linked to the ω phase, has prevented industrial uptake. The ω phase exists in two distinct forms, athermal (ω_ath) and isothermal (ω_iso), yet despite their differences the two are often conflated, leading to conflicting statements surrounding their influence. Using in situ synchrotron diffraction, the mechanical response of two initially identical samples of Ti-24Nb (at.%), one cooled to form ω_ath and the other aged to form ω_iso, was evaluated. The ω_ath sample exhibited superelasticity, with the ω_ath consumed by the growing α″ martensite. In contrast, the ω_iso sample showed no evidence of a transformation. These data conclusively show that the ω_ath should not be considered a problem for superelastic alloy development, whilst the evolution of ω_iso is highly detrimental.

超弹性亚稳态β-钛合金是一种应力诱导β→α″转变的合金，在生物医学和航空航天领域引起了广泛的关注。然而，预测和控制其超弹性性能的困难（通常与ω相有关）阻碍了工业应用。ω相以两种不同的形式存在，非热相（ωath）和等温相（ωiso），尽管它们不同，但它们经常被混为一谈，导致围绕它们的影响的相互矛盾的陈述。利用原位同步加速器衍射，研究了两种初始相同Ti-24Nb （at）样品的力学响应。%)，一个冷却形成ωath，另一个老化形成ωiso。ωath样品表现出超弹性，ωath被生长的α″马氏体消耗。相比之下，ωiso样本没有显示出变化的证据。这些数据表明，ω ω不应被认为是超弹性合金发展的一个问题，而ω ω ω的演变是非常有害的。

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引用次数: 0

Achieving higher Curie temperature and magnetic entropy change by minor Co substitution for Fe in a Fe88Pr10Al2 amorphous alloy 用少量Co取代Fe88Pr10Al2非晶合金中的Fe，获得了较高的居里温度和磁熵变化

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-02-01 Epub Date: 2025-12-06 DOI: 10.1016/j.intermet.2025.109125

Z.B. Li , J.M. Yuan , Q. Wang , D. Ding , L. Xia

By replacing a small amount of Fe with Co in the Fe₈₈Pr₁₀Al₂ amorphous alloy, we obtained Fe₈₆Co₂Pr₁₀Al₂ amorphous ribbons with excellent magnetocaloric properties near 313 K. The microstructure, glass formability, magnetic and magnetocaloric properties of the Co-doped metallic glass were studied and compared to those of the Co-free metallic glass. It was found that the fully amorphous Fe₈₆Co₂Pr₁₀Al₂ ribbon exhibits remarkable magnetocaloric properties, including a Curie temperature (T_c) of 313 K, a notably high magnetic entropy change peak (−ΔS_m^peak, ∼4.79 J/(kg × K)) and a refrigerant capacity up to 766 J/kg under 5 T. The mechanism by which the Co substitution affects the magnetic and magnetocaloric properties of the Fe₈₈Pr₁₀Al₂ amorphous alloy was investigated.

通过在Fe88Pr10Al2非晶合金中加入少量的Co，获得了在313 K附近具有优异磁热性能的Fe86Co2Pr10Al2非晶带。研究了共掺杂金属玻璃的微观结构、玻璃成形性能、磁性和磁热性能，并与不掺杂金属玻璃进行了比较。结果表明，Fe86Co2Pr10Al2非晶带具有显著的磁热学性能，居里温度（Tc）为313 K，具有显著的高磁熵变峰（−ΔSmpeak, ~ 4.79 J/(kg × K)）， 5 t下制冷剂容量可达766 J/kg。研究了Co取代对Fe88Pr10Al2非晶合金磁热学性能的影响机理。

引用次数: 0

Age-hardening treatment induced multiscale precipitation for enhanced wear resistance in laser-cladded high-entropy alloy coatings 时效硬化处理诱导多尺度析出以提高激光熔覆高熵合金涂层的耐磨性

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-02-01 Epub Date: 2025-12-13 DOI: 10.1016/j.intermet.2025.109128

Bin Wang , Tengbo Ye , Hao Liu , Zhiyuan Shi , Binxin Dong , Gang Shen , Yu Tang , Yu Fan , Qiansheng Xu

Ni_3x(FeCr)_yCo_(x + y)/2 high-entropy alloy coatings (HEACs) with different elemental ratios (x/y = 0.5, 0.75, 1.0, 1.5) were fabricated by laser cladding to investigate the effects of age-hardening treatment on their microstructure, mechanical properties, and wear behavior. The as-prepared coatings consist of brittle Laves phases and ductile γ phases. Increasing the x/y ratio reduces the fraction of Laves phase and improves toughness but decreases microhardness. Age-hardening treatment refines and partially dissolves Laves phases, enriches the γ matrix in Ni, and promotes coherent nanoscale γ′ precipitation, resulting in a multiscale heterogeneous precipitation structure. This significantly enhances microhardness and toughness. In particular, the aged alloy with an x/y ratio of 1.5 exhibits a microhardness as high as 416.91 HV0.3. Tribological tests show that as-prepared coatings undergo combined oxidative and adhesive wear. At low x/y ratios (0.5, 0.75), wear is dominated by brittle delamination, while higher ratios (1.0, 1.5) favor controlled adhesive wear supported by protective oxide films. After age-hardening treatment, wear rates decrease markedly across all compositions, reaching a minimum of 2.32 × 10⁻⁵ mm³/(N·m) at x/y = 1.5, due to improved oxide film protectiveness and synergistic strengthening by γ′ precipitates. This work highlights age-hardening treatment as an effective strategy to optimize HEACs, achieving a superior balance of strength, toughness, and wear resistance for tribological applications.

采用激光熔覆法制备不同元素比（x/y = 0.5、0.75、1.0、1.5）的Ni3x(FeCr)yCo(x + y)/2高熵合金涂层（HEACs），研究时效硬化处理对其组织、力学性能和磨损性能的影响。制备的涂层由脆性Laves相和韧性γ相组成。增大x/y比可降低Laves相的含量，提高韧性，但降低显微硬度。时效硬化处理细化和部分溶解Laves相，使Ni中的γ基体富集，促进纳米级γ′的相干析出，形成多尺度非均相析出结构。这大大提高了显微硬度和韧性。其中，x/y比值为1.5时效合金的显微硬度高达416.91 HV0.3。摩擦学试验表明，所制备的涂层经受氧化磨损和粘着磨损的双重作用。在低x/y比（0.5,0.75）时，磨损主要是脆性脱层，而较高的x/y比（1.0,1.5）有利于氧化保护膜支持的受控粘着磨损。时效硬化处理后，所有成分的磨损率都显著降低，在x/y = 1.5时，磨损率最低达到2.32 × 10−5 mm3/(N·m)，这是由于氧化膜保护性能的提高和γ′沉淀的协同强化。这项工作强调了时效硬化处理是优化HEACs的有效策略，可以在摩擦学应用中实现强度、韧性和耐磨性的卓越平衡。

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引用次数: 0

Strain rate sensitivity and dynamic constitutive response of a Zr42Ti15Nb20Ta20Al3 refractory high-entropy alloy Zr42Ti15Nb20Ta20Al3难熔高熵合金应变速率敏感性及动态本构响应

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-02-01 Epub Date: 2025-12-09 DOI: 10.1016/j.intermet.2025.109124

Zhanxuan Wang , Heling Zheng , Mingyang Wang , Xintian Li , Xiancheng Li , Zhengkun Li , Zhonghua Du , Lizhi Xu

This study comprehensively characterizes the dynamic mechanical response of the Zr₄₂Ti₁₅Nb₂₀Ta₂₀Al₃(at.%) refractory high-entropy alloy (RHEA) spanning a strain rate spectrum from 0.001 to 5500 s⁻¹. A significant strain-rate hardening effect, where the yield strength surged from 1166 MPa under quasi-static loading to 2017 MPa in the dynamic regime. Microstructural examinations indicate a fundamental shift in the deformation mode: while dislocation slip dominates at lower rates, adiabatic shear bands (ASBs) precipitate failure under high-velocity impact. Based on these empirical findings, the Johnson-Cook constitutive and damage parameters were calibrated. The model was validated through ballistic experiment, and the simulation was in excellent agreement with the experimental observations. These results highlight the potential of this RHEA for next-generation warhead applications.

本研究全面表征了Zr42Ti15Nb20Ta20Al3（at）的动态力学响应。%)耐火高熵合金（RHEA）的应变速率谱从0.001到5500 s−1。具有明显的应变率硬化效应，屈服强度从准静态加载下的1166 MPa上升到动态加载下的2017 MPa。显微组织检查表明变形模式发生了根本性的转变：当位错滑移在较低速率下占主导地位时，绝热剪切带（asb）在高速冲击下析出破坏。基于这些经验发现，对Johnson-Cook本构和损伤参数进行了校准。通过弹道实验对模型进行了验证，仿真结果与实验结果吻合良好。这些结果突出了这种RHEA在下一代弹头应用中的潜力。

引用次数: 0

Study of microstructural evolution in NiAl-Steel laminate composite after shock wave loading and heat treatment NiAl-Steel层合复合材料冲击波加载及热处理后组织演变研究

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-02-01 Epub Date: 2025-11-27 DOI: 10.1016/j.intermet.2025.109097

A. Yu Malakhov , S.A. Seropyan , I.V. Denisov , I.V. Saikov , D.V. Shakhray

The paper presents a comparative study of two methods for the fabrication of Ni/Al-based metal-intermetallic laminate (MIL) composites within a steel matrix: shock wave loading (SWL) and a combined SWL/heat treatment (HT) method. Initiating the reaction in self-propagating high-temperature synthesis (SHS) mode under shock wave loading resulted in the formation of an intermetallic layer (IL) with an average microhardness of 500 HV. This IL exhibited both non-uniform thickness and cracking. The reaction initiated at the sample's end, where conditions conducive to SHS were established, and then propagated towards the top. At the top of the sample, the reaction products were quenched because heat removal exceeded heat generation. The two-step SWL/HT method ensured the formation of a multiphase IL (NiAl, Ni₂Al₃, Ni₃Al) without cracks, but it was accompanied by gas evolution, causing deformation and delamination. The microhardness varied from 370 to 850 HV, with an average of 530 HV. Optimizing the process by removing gases maintained the interface's integrity but resulted in localized transverse cracks. The average microhardness of the IL was 590 HV, with a range of 450–900 HV. The heating rate during HT significantly affected the completeness of the transformation: slow heating (11.5 °C/min) promoted more complete NiAl formation compared to rapid heating (23 °C/min). Recommendations for minimizing defects in each method were developed. The results obtained are of interest for fabricating composites with improved mechanical and thermal properties, which are in demand in the aerospace and energy industries.

本文比较研究了在钢基体中制备Ni/ al基金属间层压（MIL）复合材料的两种方法：激波加载（SWL）和激波加载/热处理（HT）相结合的方法。在激波载荷下以自传播高温合成（SHS）模式引发反应，形成平均显微硬度为500 HV的金属间层（IL）。该IL具有厚度不均匀和开裂的特点。反应开始于样品的末端，在那里建立了有利于SHS的条件，然后向顶部传播。在样品的顶部，反应产物被淬火，因为热量的释放超过了热量的产生。两步SWL/HT法确保了多相IL （NiAl, Ni2Al3, Ni3Al）的形成没有裂纹，但伴随着气体的析出，导致变形和分层。显微硬度为370 ~ 850 HV，平均为530 HV。通过去除气体来优化工艺，保持了界面的完整性，但导致了局部横向裂纹。IL的平均显微硬度为590 HV，范围为450 ~ 900 HV。高温过程中的加热速率显著影响转变的完整性：与快速加热（23°C/min）相比，缓慢加热（11.5°C/min）促进了更完整的NiAl形成。提出了将每种方法中的缺陷最小化的建议。所获得的结果对制造具有改进的机械和热性能的复合材料感兴趣，这在航空航天和能源工业中是有需求的。

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引用次数: 0