Intermetallics最新文献_第5页

Effect of Co on microstructure and properties of iron-rich AlCoxCrFe2.5Ni (x = 0, 0.2, 0.5, 1.0) high entropy alloys Co对富铁AlCoxCrFe2.5Ni （x = 0,0.2, 0.5, 1.0）高熵合金组织和性能的影响

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-12-18 DOI: 10.1016/j.intermet.2025.109132

Guojin Zhang , Hongqiao Feng , Guanghang Shi , Yinong Wang , Xi Chen

To develop cost-effective and thermally stable iron-rich AlCoCrFeNi system high entropy alloys, this study systematically investigated the microstructure, mechanical properties, and phase stability of AlCo_xCrFe_2.5Ni (x = 0, 0.2, 0.5, 1.0) high entropy alloys. For x = 0, 0.2, and 0.5, the alloy exhibits a dendritic morphology. In the dendrite region, the matrix is the A2 (disordered BCC) phase, and the B2 (ordered BCC) phase exists as particles. In the interdendritic region, the A2 and B2 phases are arranged in a weave-like pattern. Notably, increasing the Co content reduces the dendritic area, and the dendritic morphology disappears entirely at x = 1.0. After annealing at 600 °C, 800 °C, 1000 °C, and 1200 °C for 5 h, it was found that lowering the Co content enhances phase stability, suppresses FCC phase precipitation, and mitigates high temperature softening. CALPHAD phase diagram calculations further confirm that when the alloy is Co-poor, the A2/B2 structure can be retained over a wide temperature range. When x = 0, the alloy achieves a high yield strength (1205 MPa) and compressive ductility (>50 %) at room temperature, while retaining good strength below 600 °C. The B2 particles have a remarkable strengthening effect. As the Co content decreases, the area of the high-strength dendritic regions containing B2 particles expands, which is the primary mechanism for the alloy's strength retention.

为了开发具有成本效益和热稳定性的富铁AlCoCrFeNi体系高熵合金，本研究系统地研究了AlCoxCrFe2.5Ni （x = 0,0.2, 0.5, 1.0）高熵合金的显微组织、力学性能和相稳定性。当x = 0、0.2和0.5时，合金呈现枝晶形态。在枝晶区，基体为A2（无序BCC）相，B2（有序BCC）相以颗粒形式存在。在枝晶间，A2相和B2相呈织状排列。值得注意的是，随着Co含量的增加，枝晶面积减小，在x = 1.0时枝晶形态完全消失。在600℃、800℃、1000℃和1200℃退火5 h后，发现降低Co含量提高了相稳定性，抑制了FCC相的析出，减轻了高温软化。calphhad相图计算进一步证实，当合金贫钴时，在较宽的温度范围内可以保持A2/B2结构。当x = 0时，合金在室温下具有较高的屈服强度（1205 MPa）和抗压塑性（> 50%），在600℃以下仍保持良好的强度。B2粒子具有显著的强化作用。随着Co含量的降低，含有B2粒子的高强度枝晶区域面积扩大，这是合金强度保持的主要机制。

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引用次数: 0

Microstructure and properties of NiTi/NiTiNb ultrafine eutectic composite welded joints with superelasticity 超弹性NiTi/NiTiNb超细共晶复合焊接接头的组织与性能

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-12-15 DOI: 10.1016/j.intermet.2025.109133

Bo Feng , Ke Yang , Hui Shen , Zhixin Su , Jianhua Zhao , Yifan Wu , Shijie Hao

NiTi shape memory alloys (SMAs), as typical advanced functional intermetallics, have extensive applications. While their complex-structured components have been restricted by poor weldability. In this study, eutectic-composition NiTiNb wires were used as the interlayer to fabricate NiTi welded joints via laser welding, aiming to address the issues of porosity, brittle precipitations, and properties’ degradation in conventional NiTi welds. The results demonstrate that the welded joint exhibits a refined eutectic microcomposite. The high fluidity of the NiTiNb eutectic suppress the formation of porosity and brittle phases in the weld zone. Meanwhile, the NiTi constituent in the eutectic endows a continuous interface transition between the weld joint and the NiTi based sheets. The soft β-Nb phase in the eutectic mitigates the joint hardness and brittleness. In addition, this NiTi/NiTiNb welded composite achieves a tensile strain exceeding 10 % and a superelastic strain of over 5 %, both far outperforming the directly welded NiTi joint. This work provides a novel strategy for improving the weldability of NiTi SMAs, holding great potential for applications in functional devices.

NiTi形状记忆合金作为典型的高级功能金属间化合物，具有广泛的应用前景。而其结构复杂的部件由于焊接性差而受到限制。本研究采用共晶成分的NiTiNb丝作为中间层，通过激光焊接制备NiTi焊接接头，旨在解决传统NiTi焊缝存在的气孔、脆性析出和性能下降等问题。结果表明，焊接接头呈现出一种细化的共晶微观复合材料。NiTiNb共晶的高流动性抑制了焊缝区孔隙和脆性相的形成。同时，共晶中的NiTi成分使焊缝与NiTi基板之间的界面发生连续转变。共晶中较软的β-Nb相降低了接头的硬度和脆性。此外，这种NiTi/NiTiNb焊接复合材料的拉伸应变超过10%，超弹性应变超过5%，两者都远远优于直接焊接的NiTi接头。这项工作为提高NiTi sma的可焊性提供了一种新的策略，在功能器件中具有很大的应用潜力。

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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 : 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

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 : 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

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 : 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

Activation energy evolution during large-strain cyclic loading induced structural rejuvenation in a CuZr metallic glass 大应变循环加载诱导CuZr金属玻璃结构回春的活化能演化

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-12-11 DOI: 10.1016/j.intermet.2025.109127

Si-Jin Zhao , Guo-Jian Lyu , Bing Wang , Yun-Jiang Wang , Claudio Fusco , Ji-Chao Qiao

This study combines molecular dynamics simulations with the activation-relaxation technique to investigate the rejuvenation behavior of Cu₆₄Zr₃₆ metallic glass under large-strain cyclic loading. The research reveals that large-strain cyclic loading effectively increases the potential energy of the configuration, promotes atomic rearrangement processes, and significantly reduces the activation energy barrier. By analyzing the evolution of ten representative atomic clusters during the loading process, notable changes in icosahedral clusters are observed, demonstrating their sensitivity to mechanical loading. Additionally, the average activation energy barrier of the central atoms in specific cluster types decreases with the degree of rejuvenation, indicating that the activation energy depends not only on the nearest-neighbor arrangement but also on the environment beyond the first coordination shell. For the potential energy landscape (PEL), high-energy configurations consistently exhibit lower average activation energies, while low-energy configurations display higher energy barriers. The evolution of activation energy in samples subjected to different large-strain cyclic loads provides a pathway for exploring the characteristics of complex PEL and enhances the understanding of the local features of the PEL for amorphous solids.

本研究结合分子动力学模拟和激活松弛技术，研究了Cu64Zr36金属玻璃在大应变循环加载下的回弹行为。研究表明，大应变循环加载有效地增加了构型势能，促进了原子重排过程，并显著降低了活化能势垒。通过对10个典型原子团簇在加载过程中的演化分析，观察到二十面体团簇的显著变化，证明了其对机械加载的敏感性。此外，特定簇型中心原子的平均活化能势垒随再生程度而降低，表明活化能不仅取决于最近邻排列，还取决于第一配位壳层以外的环境。对于势能格局（PEL），高能量构型表现出较低的平均活化能，而低能构型表现出较高的能垒。不同大应变循环载荷作用下样品活化能的演化为探索复杂PEL的特性提供了途径，增强了对非晶固体PEL局部特征的理解。

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引用次数: 0

Achieving strength-ductility synergy in Ta/Ti Co-doped γ′-Ni3Al precipitates: An integrated theoretical and experimental investigation 在Ta/Ti共掺杂γ′-Ni3Al析出物中实现强度-延性协同：理论和实验的综合研究

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-12-11 DOI: 10.1016/j.intermet.2025.109120

Ziyi Ren , Yuchao Lin , Yongle Hu , Yonggang Tong , Pengfei Wu , Xiubing Liang , Jingzhong Fang , Xixi Ji , Kaiming Wang , Mingjun Zhang

γ′-Ni₃Al precipitate dictates elevated-temperature performance of the nickel-based superalloys but exhibit hardness deficiency under extreme thermomechanical loads. We devised a Ta and Ti co-doped strategy to overcome this deficiency, revealing atomic-scale synergistic strengthening mechanisms by experimental and theoretical methods. Optimal 12.5 at. % Ta doping enhances microhardness to 1023.6 Hv through the intensification of Ni-Ta covalent bonding. However, excessive Ta has been induced lattice instability. Ti effectively stabilizes the crystal structure via charge redistribution, with pronounced directional hybridization between Ti-3d and Ni orbitals establishes stable electron cloud configurations. Remarkably, the co-doped Ni₃Al_0.25Ta_0.25Ti_0.5 precipitate achieves exceptional mechanical performance, exhibiting a remarkable 49.4 % enhancement in microhardness to 1112.03 Hv compared to pristine γ′-Ni₃Al (744.33Hv) while maintaining superior plasticity. Furthermore, the γ′-Ni₃(Al, Ta, Ti)-strengthened ATT alloy exhibits a yield strength exceeding 1.2 GPa while retaining 20 % plasticity, achieving an exceptional strength-ductility synergy that is consistent with computational predictions. Critical strengthening is attributed to Ta and Ti elements directional reinforcement of Ni-Al bonds. Ta-5d/Ti-3d orbital hybridization induces an enhanced density of states near the Fermi level. The present work provides a design method for nickel-based superalloys with strength-ductility synergy.

γ′-Ni3Al析出决定了镍基高温合金的高温性能，但在极端热机械载荷下表现出硬度不足。我们设计了一种Ta和Ti共掺杂策略来克服这一缺陷，通过实验和理论方法揭示了原子尺度的协同强化机制。最佳12.5秒。% Ta通过强化Ni-Ta共价键，使合金显微硬度提高到1023.6 Hv。然而，过量的Ta会引起晶格不稳定。Ti通过电荷重分配有效地稳定了晶体结构，Ti-3d和Ni轨道之间明显的定向杂化建立了稳定的电子云构型。值得注意的是，共掺杂Ni3Al0.25Ta0.25Ti0.5析出物具有优异的力学性能，与原始γ′-Ni3Al （744.33Hv）相比，显微硬度提高了49.4%，达到1112.03 Hv，同时保持了优异的塑性。此外，γ′-Ni3（Al, Ta, Ti）强化ATT合金显示出超过1.2 GPa的屈服强度，同时保持20%的塑性，实现了与计算预测一致的卓越的强度-塑性协同作用。临界强化是由于Ta和Ti元素对Ni-Al键的定向强化。Ta-5d/Ti-3d轨道杂化诱导了费米能级附近态密度的增强。本工作为具有强塑性协同作用的镍基高温合金提供了一种设计方法。

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引用次数: 0

Embrittlement after high-temperature exposure to air of a near-γ TiAl alloy 近γ TiAl合金高温暴露于空气后的脆化

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-12-11 DOI: 10.1016/j.intermet.2025.109108

Frederic Habiyaremye , Camille Thenot , Pierre Sallot , Daniel Monceau , Jean-Philippe Monchoux

The loss of ductility of a Ti–48Al–2Cr–2Nb (at%) near-γ alloy after exposure to 80 % Ar–20 % O₂ at 700 °C for 1 h and 100 h has been investigated. In addition to marked decreases in ductility classically reported, increases in yield stress reaching +25 % have been observed. SIMS depth profiles enabled the determination of the ¹⁸O isotope penetration depth via volume diffusion, which reached about 10 μm after 100 h of exposure. Site-specific lift–out by FIB, along with EBSD and TEM characterizations, were employed to examine the local transformations occurring in the diffusion zone and within the volume of exposed tensile specimens. In-situ TEM straining experiments were carried out on exposed and un-exposed specimens to study the influence of exposure on the microscopic mechanisms occurring in the bulk material. Results revealed the formation of chromium-rich precipitates and a recrystallized zone extending up to a depth of 15 μm from the surface after exposure. The dislocations in the subsurface layer were non-linear, likely due interactions between dislocation lines and oxygen solutes from the exposure atmosphere which potentially contribute to strengthening of the subsurface layer and ultimately to premature failure in this region. The elevated scattering in the in-situ TEM data did not allow to correlate the dislocation jump distances to the increase in yield stress.

研究了Ti-48Al-2Cr-2Nb （at%）近γ合金在700℃下暴露于80% ar- 20% O2中1 h和100 h后的塑性损失。除了经典报道的延性显著下降外，还观察到屈服应力增加了25%。SIMS深度剖面可以通过体积扩散测定18O同位素的穿透深度，暴露100 h后达到10 μm左右。通过FIB， EBSD和TEM表征，研究了扩散区和暴露拉伸试样体积内发生的局部转变。对暴露和未暴露试样进行原位TEM应变试验，研究暴露对块状材料微观机制的影响。结果表明，暴露后形成了富铬析出物和从表面延伸至15 μm深度的再结晶区。次表层的位错是非线性的，可能是由于位错线与暴露大气中的氧溶质之间的相互作用，这可能有助于次表层的强化，并最终导致该区域的过早破坏。原位TEM数据中的高散射不能将位错跳跃距离与屈服应力的增加联系起来。

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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 : 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

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 : 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