Intermetallics最新文献_第4页

Achieving improved wear resistance and balanced strength-ductility in laser powder bed fused Al0.3CoCrFeNi alloy via L12 precipitation 通过L12析出，提高了Al0.3CoCrFeNi激光粉末床熔敷合金的耐磨性和强度-塑性平衡

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-04-01 Epub Date: 2026-02-03 DOI: 10.1016/j.intermet.2026.109171

Shaopeng Liu , Xiaobo Li , Zhipeng Ge , Han Zhang , Qiang Hu , Huoping Zhao , Mingxue Shen

Synergistically enhancing the strength, ductility, and wear resistance of LPBF-fabricated Al_0.3CoCrFeNi alloy is critical for advancing its industrial applications. In this study, the effect of nano-scale precipitates, generated through annealing at 550 °C for durations ranging from 25 to 300 h, on the mechanical and tribological properties was systematically investigated. The as-fabricated alloy featured cellular structures with an average cell size of approximately 0.53 μm. Low-temperature annealing promoted the formation of spherical L1₂ precipitates, which had an average size of 1.85 ± 0.76 nm. These precipitates effectively accommodated and impeded dislocation motion, enabling an excellent combination of mechanical properties, including a tensile strength of 973.3 ± 15.6 MPa and an elongation of 20.6 %. Compared to the as-printed sample, the annealed material exhibits a 25.3 % increase in tensile strength and a 32.9 % improvement in elongation. After 150 h of annealing, the wear rate decreased to 0.798 × 10⁻⁴ mm³/N·m, representing a 30.8 % reduction compared to the as-printed sample. This enhancement in wear resistance primarily originates from the role of the L1₂ precipitates in facilitating the formation of a dense, protective oxide layer that exhibits both anti-wear and self-lubricating properties.

协同提高lpbf制备的Al0.3CoCrFeNi合金的强度、延展性和耐磨性对于推进其工业应用至关重要。在这项研究中，系统地研究了在550°C下退火25至300小时产生的纳米级析出物对机械和摩擦学性能的影响。制备的合金具有平均孔径约0.53 μm的胞状结构。低温退火促进了球形L12析出相的形成，其平均尺寸为1.85±0.76 nm。这些析出相有效地调节和阻碍了位错运动，使材料的抗拉强度达到973.3±15.6 MPa，伸长率达到20.6%，具有优异的综合力学性能。与印刷样品相比，退火材料的抗拉强度提高了25.3%，伸长率提高了32.9%。退火150 h后，磨损率降至0.798 × 10−4 mm3/N·m，与印刷样品相比降低了30.8%。这种耐磨性的增强主要源于L12沉淀的作用，它有助于形成致密的、具有抗磨损和自润滑特性的保护性氧化层。

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引用次数: 0

Engineering ultra-low friction via structural relaxation in Ni55Ti45 ultra thin amorphous films 利用Ni55Ti45超薄非晶薄膜的结构松弛实现工程超低摩擦

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-04-01 Epub Date: 2026-02-04 DOI: 10.1016/j.intermet.2026.109182

Qunfeng Zeng, Wanjun He

This study investigates the effect of thermal annealing on the nano-mechanical and nano-tribological properties of sputter-deposited Ni₅₅Ti₄₅ ultrathin films (∼180 nm). Annealing at 350 °C induces structural relaxation, leading to the in-plane film shrinkage due to densification and an increase in surface roughness, driven by the formation of dominant hillock features. The short-range ordered domain in the film is formed and expanded. These structural changes yield an improvement in hardness and enhancement in elastic recovery compared to the as-deposited state. The as-deposited film and structurally relaxed film have amorphous structure, but only the structurally relaxed film can take full advantage of amorphous structure's inherent properties. The structurally relaxed Ni₅₅Ti₄₅ ultrathin film has the enhanced nano-tribological performance. Crucially, the annealed Ni₅₅Ti₄₅ ultrathin film at 350 °C for 1 h exhibits superior tribological performance, achieving a coefficient of friction (COF) as low as ∼0.09 without lubrication. The results establish a direct link between thermally engineered surface topography and enhanced functional properties, demonstrating a promising route for optimizing wear-resistant nanoscale coatings.

本研究研究了热退火对溅射沉积Ni55Ti45超薄膜（~ 180 nm）纳米力学和纳米摩擦学性能的影响。350℃退火诱导结构松弛，由于致密化导致膜内收缩，表面粗糙度增加，主要由丘状特征的形成驱动。薄膜中的短程有序畴形成并扩展。与沉积状态相比，这些结构变化产生了硬度的改善和弹性恢复的增强。沉积膜和结构松弛膜均具有非晶态结构，但只有结构松弛膜才能充分发挥非晶态结构的固有特性。结构松弛的Ni55Ti45超薄膜具有增强的纳米摩擦学性能。关键是，在350°C下退火1小时的Ni55Ti45超薄膜表现出优异的摩擦学性能，在没有润滑的情况下，其摩擦系数（COF）低至~ 0.09。研究结果建立了热工程表面形貌与增强功能性能之间的直接联系，为优化耐磨纳米涂层展示了一条有前途的途径。

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引用次数: 0

Microstructure, mechanical properties, wear, and corrosion resistance of as-cast VZrTa0.5Tix refractory medium-entropy alloys 铸态VZrTa0.5Tix难熔中熵合金的组织、力学性能、磨损及耐蚀性

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-04-01 Epub Date: 2026-01-23 DOI: 10.1016/j.intermet.2026.109175

Peihao zhang , Xinmei Li , Aixiang Zhang , Liping Wu , Yangxuan Xie

This study fabricated a series of VZrTa_0.5Ti_x (molar ratio, x = 0.25, 0.5, 0.75, 1, 1.25) refractory medium-entropy alloys (RMEAs) using vacuum arc melting technology. It systematically investigated the comprehensive effects of Titanium content variation on the alloys' microstructure, mechanical properties, wear resistance, and electrochemical corrosion behaviors. Microstructural analysis reveals that while the addition of Ti effectively suppresses the precipitation of brittle intermetallic compound (IMC) phases, excessive Ti promotes the formation of Ti₃V IMC phases. Consequently, as Ti content increases, hardness initially decreases before rising to a maximum of 549.5 HV in the Ti1.25 composition, whereas plasticity shows an inverse trend. Notably, the Ti0.25 alloy exhibits the highest yield strength of 2108.2 MPa, while the Ti1 alloy achieves optimal plasticity at 18.3 %. Room temperature dry wear tests showed that the Ti1.25 alloy possesses the lowest friction coefficient (0.473) and wear rate (2.9 × 10⁻⁴ mm³/N·m). Furthermore, electrochemical tests in 3.5 % NaCl solution establish that the Ti1 alloy displays superior corrosion resistance. Ultimately, the Ti1 alloy offers a balance of plasticity and corrosion resistance, while Ti1.25 excels in strength and wear resistance, indicating significant engineering potential.

采用真空电弧熔炼技术制备了一系列VZrTa0.5Tix（摩尔比，x = 0.25, 0.5, 0.75, 1,1.25）耐火中熵合金（RMEAs）。系统研究了钛含量变化对合金显微组织、力学性能、耐磨性和电化学腐蚀行为的综合影响。显微组织分析表明，Ti的加入有效抑制了脆性金属间化合物（IMC）相的析出，而过量的Ti则促进了Ti3V IMC相的形成。因此，随着Ti含量的增加，Ti1.25组分的硬度先下降后上升到最大值549.5 HV，而塑性呈相反趋势。其中，Ti0.25合金屈服强度最高，为2108.2 MPa，而Ti1合金塑性最佳，为18.3%。室温干磨损试验表明，Ti1.25合金具有最低的摩擦系数（0.473）和磨损率（2.9 × 10−4 mm3/N·m）。此外，在3.5% NaCl溶液中的电化学试验表明，Ti1合金具有优异的耐蚀性。最终，Ti1合金提供了塑性和耐腐蚀性的平衡，而Ti1.25合金在强度和耐磨性方面表现出色，显示出巨大的工程潜力。

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引用次数: 0

The effect of Ta segregation on the corrosion resistance of the Fe30Ni30Cr30Al10-xTax high entropy alloys in lead-bismuth eutectic at 800 °C 在800℃铅铋共晶中，Ta偏析对Fe30Ni30Cr30Al10-xTax高熵合金耐蚀性的影响

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-03-01 Epub Date: 2026-01-21 DOI: 10.1016/j.intermet.2026.109170

Weibing Wang , Wu Kai , Tao Yang , Da Chen , Jixun Zhang , Junhua Luan , Chin-Hua Yang , Bo Wang , Meng Zhang , Ji-jung Kai

Lead-bismuth eutectic (LBE)-cooled reactors were considered promising candidates for Generation IV nuclear reactor systems due to the favorable physical properties and exceptional safety performance of LBE. This study investigated the role of Ta in enhancing the corrosion resistance of Fe₃₀Ni₃₀Cr₃₀Al_10-xTa_x high-entropy alloys (HEAs) exposed to static LBE at 800 °C. Multiscale characterization revealed that Ta-free HEA (0Ta-HEA) formed an outer FeCr₂O₄ spinel layer, which permitted significant LBE penetration and inward diffusion of oxygen within the first 48h. In contrast, the 2 at.% (in atomic percent) Ta HEA (2Ta-HEA) exhibited superior corrosion resistance, with corrosion depth reduced by ∼40 %. The low solubility of Ta in LBE led to its rapid saturation and local precipitation, which, in turn, formed protective phases comprising a mixed layer of Al₂O₃, Cr-rich phase, and FeCr phase. After 168 h of exposure, the competitive mechanism between dissolution and oxidation dominated in the 2Ta-HEA. The mixed layer formed during the initial stage of corrosion gradually evolved into a double-layered scale, consisting of an outer Ta-rich LBE layer and an inner layer of Cr₂O₃ and FeCr₂O₄. The discontinuous Al₂O₃ only inhibited the penetration of LBE at the initial stage of corrosion. These findings highlighted Ta as a strategic alloying element for mitigating LBE corrosion in nuclear applications, stabilizing interfaces, and minimizing elemental loss.

铅铋共晶（LBE）冷却反应堆由于其良好的物理性能和优异的安全性能，被认为是第四代核反应堆系统的有希望的候选者。研究了Ta在提高Fe30Ni30Cr30Al10-xTax高熵合金（HEAs） 800℃静态LBE腐蚀性能中的作用。多尺度表征表明，不含ta的HEA （0Ta-HEA）在fer2o4外层形成尖晶石层，使氧在前48小时内具有明显的LBE渗透和向内扩散。相反，2。Ta HEA （2Ta-HEA）表现出优异的耐腐蚀性，腐蚀深度降低了~ 40%。Ta在LBE中的低溶解度导致其快速饱和和局部沉淀，进而形成由Al2O3、富cr相和FeCr相混合层组成的保护相。暴露168 h后，2Ta-HEA以溶解和氧化的竞争机制为主。腐蚀初期形成的混合层逐渐演变为双层垢，外层为富ta的LBE层，内层为Cr2O3和FeCr2O4层。不连续Al2O3仅在腐蚀初期抑制LBE的渗透。这些发现突出表明，在核应用中，Ta是一种减轻LBE腐蚀、稳定界面和减少元素损失的战略合金元素。

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引用次数: 0

Synergistic strengthening and microstructure evolution of laser-cladded CoCrFeNiWx high-entropy alloy coatings with enhanced thermal fatigue and wear resistance 激光熔覆CoCrFeNiWx高熵合金涂层的协同强化和显微组织演变

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-03-01 Epub Date: 2026-01-08 DOI: 10.1016/j.intermet.2025.109142

Taiqing Li , Qi Sui , Jianbin Zhang , Ying Han , Xiaolei Song , Xu Ran , Bingrun Yang , Shuai Wang , Shiyu He , Xianwen Shen

Mechanical components operating under high-temperature service conditions are prone to thermal fatigue and wear failures. In this study, CoCrFeNiW high-entropy alloy (HEA) coatings with different tungsten (W) contents were fabricated by laser cladding, and their microstructure, thermal fatigue resistance, and post-fatigue wear behavior were systematically evaluated. Results show that increasing W content significantly improves microhardness and enhances resistance to thermal fatigue under cyclic heating from room temperature to 900 °C. The moderate addition of W facilitates the formation of a compact oxide layer, thereby reducing wear rate and improving tribological performance, with the optimum effect observed at W = 0.8. In contrast, excessive W addition (x = 1.0) accelerates crack propagation, leading to deteriorated wear resistance. These findings highlight the importance of tailoring W content to balance hardness, wear resistance, and thermal fatigue properties, providing valuable insights for the application of HEA coatings in high-temperature service environments.

在高温条件下工作的机械部件容易出现热疲劳和磨损故障。采用激光熔覆法制备了不同钨含量的CoCrFeNiW高熵合金（HEA）涂层，并对其显微组织、热疲劳性能和疲劳后磨损性能进行了系统评价。结果表明：室温~ 900℃循环加热下，W含量的增加显著提高了合金的显微硬度和抗热疲劳性能；适量添加W有利于形成致密的氧化层，从而降低磨损率，提高摩擦学性能，当W = 0.8时效果最佳。过量W的加入（x = 1.0）会加速裂纹扩展，导致耐磨性恶化。这些发现强调了调整W含量以平衡硬度、耐磨性和热疲劳性能的重要性，为HEA涂层在高温服务环境中的应用提供了有价值的见解。

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引用次数: 0

Defect microstructure and hardening in uniformly damaged long-range-ordered (Fe, Ni)3V alloy under 528 MeV Xe ion irradiation 528mev Xe离子辐照下均匀损伤长程有序（Fe, Ni）3V合金的缺陷组织与硬化

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-03-01 Epub Date: 2026-01-20 DOI: 10.1016/j.intermet.2026.109166

Hui Liu , Shiwei Wang , Xiaoou Yi , Jing Hu , Sichen Dong , Wentuo Han , Pingping Liu , Ke Jin , Somei Ohnuki , Qian Zhan , Farong Wan , Naoyuki Hashimoto

L1₂-type (Fe, Ni)₃V alloy is a promising candidate for high-temperature structural components. In this study, we investigated its defect microstructures and hardening response after creating a uniform 8 μm damage layer with 528 MeV Xe ions (350 °C/3 dpa). The alloy exhibited good phase stability in the ion-irradiation damaged layer. Microstructural analysis revealed production of irradiation-induced dislocation structures (both loops and lines) with a uniform density of 3.3 × 10¹⁴ m/m³. No void swelling was observed. Dislocation loops dominated the total dislocation density, exhibiting a mild increase in mean size with depth (from 9.0 nm to 12.3 nm), driven by an enhanced tendency for one-dimensional (1D) ordering at greater depths. This reflects the migration and elastic interaction of ½<110> loops, which account for 83.1 % of the loop population and suggested to be mostly of interstitial nature by a high-voltage electron microscopy (HVEM) based approach. A minor fraction (∼16.9 %) of ⅓<111> Frank loops was also confirmed, the presence of which might stem from the breakdown of a small number of pre-existing ordered domains. The irradiation-induced hardening was measured at 0.55 GPa (∼11.8 %), a consequence of the pinning effect of the ½<110> loops impeding slip activation. These findings demonstrate the attractive potential of L1₂-type (Fe, Ni)₃V alloy for withstanding the lower end of operational temperatures and a benchmark damage dose anticipated in multiple nuclear reactor applications.

l12型（Fe, Ni）3V合金是一种很有前途的高温结构件材料。在这项研究中，我们研究了528 MeV Xe离子（350°C/3 dpa）形成均匀的8 μm损伤层后的缺陷显微组织和硬化响应。该合金在离子辐照损伤层中表现出良好的相稳定性。显微组织分析显示，辐照诱导的位错结构（环状和线状）密度均匀，为3.3 × 1014 m/m3。未见空洞肿胀。位错环在总位错密度中占主导地位，随着深度的增加，位错环的平均尺寸略有增加（从9.0 nm增加到12.3 nm），在深度越深，位错环的一维有序倾向越强。这反映了½<；110>；环的迁移和弹性相互作用，这些环占环总数的83.1%，并且通过基于高压电子显微镜（HVEM）的方法表明大部分是间隙性的。还证实了一小部分（~ 16.9%）的1 / 3 <；111>； Frank环，其存在可能源于少量预先存在的有序结构域的分解。辐照诱导硬化在0.55 GPa（~ 11.8%）下测量，这是阻碍滑移激活的½<；110>；环的钉住效应的结果。这些发现证明了l12型（Fe, Ni）3V合金在多种核反应堆应用中承受较低工作温度和基准损伤剂量的诱人潜力。

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引用次数: 0

Microstructural evolution and deformation mechanism in (CoCrFeNi)94Al3Ti3 high-entropy alloy ultrathin strips without intermediate annealing 未经中间退火的（CoCrFeNi）94Al3Ti3高熵合金超薄带材组织演变及变形机制

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-03-01 Epub Date: 2026-01-06 DOI: 10.1016/j.intermet.2025.109144

Lei Wu , Shengguo Ma , Tuanwei Zhang , Jianjun Wang , Dan Zhao , Zhiming Jiao , Zhihua Wang

Ultrathin metal strips are widely used in precision electronic components, flexible electronic equipment, optics and aerospace due to their unique mechanical or functional performances. However, little research is focused on the high-entropy alloy (HEA) ultrathin strip that can be used as candidates for future metallic strips. Fortunately, the (CoCrFeNi)₉₄Al₃Ti₃ HEA ultrathin strip with a thickness of 50 μm was successfully prepared by the cumulative cold rolling method. Moreover, SEM, TEM, EBSD and quasi-static tensile testing were applied to study its microstructure evolution and mechanical property in terms of different sample thicknesses. The results show that the maximum tensile strength is obtained at the thickness of 0.1 mm, reaching 1428 MPa due to work hardening. Afterwards, work softening occurs, and at 0.05 mm, the tensile strength is about 1160 MPa. Further analysis reveals that, from 5 mm to 0.1 mm, the strengthening contributions of (CoCrFeNi)₉₄Al₃Ti₃ HEA strips are mainly from dislocation strengthening and grain boundary strengthening, while when the strip size reduces to be 0.05 mm, the degradation of mechanical property is unavoided due to abnormal dislocation annihilation and surface crystal effect, resulting in work softening. This work could provide a theoretical and experimental guidance for the development of high performance high-entropy alloy ultrathin strips.

超薄金属带材以其独特的机械或功能性能，广泛应用于精密电子元件、柔性电子设备、光学和航空航天等领域。然而，对于高熵合金（HEA）超薄带材作为未来金属带材的候选材料的研究却很少。采用累积冷轧法制备了厚度为50 μm的（CoCrFeNi）94Al3Ti3 HEA超薄带材。采用扫描电镜（SEM）、透射电镜（TEM）、EBSD和准静态拉伸测试等方法研究了不同试样厚度下的微观组织演变和力学性能。结果表明：在厚度为0.1 mm时，由于加工硬化，拉伸强度达到最大，达到1428 MPa；之后发生工作软化，在0.05 mm时，拉伸强度约为1160 MPa。进一步分析表明，在5 mm ~ 0.1 mm范围内，（CoCrFeNi）94Al3Ti3 HEA带的强化贡献主要来自位错强化和晶界强化，而当带尺寸减小到0.05 mm时，由于位错异常湮灭和表面晶体效应导致的力学性能退化不可避免，导致工作软化。该工作可为高性能高熵合金超薄带材的研制提供理论和实验指导。

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引用次数: 0

Microstructure and hydrogen sorption of severely deformed TaTiVCrFe and ZrTiVCrFe refractory high-entropy alloys 严重变形TaTiVCrFe和ZrTiVCrFe难熔高熵合金的显微组织和吸氢性能

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-03-01 Epub Date: 2026-01-07 DOI: 10.1016/j.intermet.2026.109148

Farnoosh Naderi , Hamed Shahmir , Farzaneh Zareipour , Yi Huang , Mohammad Ismail

Multi-phase refractory high-entropy alloys with hydride forming elements containing body-centered cubic and Laves phases have a great potential in solid-state hydrogen storage applications. Significant hydrogen sorption capacity close to ambient temperature without activating together fast hydrogen sorption kinetics are considered as important delima for this purpose. The present investigation was conducted to process TaTiVCrFe and ZrTiVCrFe refractory high-entropy alloys by severe plastic deformation in order to satisfy these requirements. Two alloys represented noted multi-phase microstructure before and after high-pressure torsion process. In addition, thermal stability of severely deformed samples were studied after long-term annealing at an elevated temperature of 973 K. Fast hydrogen sorption was detected up to 1.04 and 2.53 wt% for severely deformed TaTiVCrFe and ZrTiVCrFe alloys, respectively, with no incubation time. Introducing structural defects, formation of a high-volume fraction of interfaces between different phases due to phase fragmentation and formation of nano/micro cracks in the severely deformed microstructure provided faster diffusion pathway and more nucleation of hydrides. High thermal stability of the processed alloys allow them to use the advantages of severe plastic deformation on the functional properties of refractory high-entropy alloys over a wide temperature range.

含有体心立方相和Laves相的多相难熔高熵合金在固态储氢方面具有很大的应用潜力。接近环境温度的显著吸氢能力而不同时激活快速吸氢动力学被认为是实现这一目的的重要条件。为了满足这些要求，本研究对TaTiVCrFe和ZrTiVCrFe耐火高熵合金进行了剧烈塑性变形加工。两种合金在高压扭转前后均表现出明显的多相组织。在973 K高温下长期退火，研究了严重变形试样的热稳定性。对于严重变形的TaTiVCrFe和ZrTiVCrFe合金，在没有培养时间的情况下，快速吸氢率分别高达1.04和2.53 wt%。引入结构缺陷，在严重变形的微观结构中，由于相断裂而形成大体积分数的不同相之间的界面，形成纳米/微裂纹，提供了更快的扩散路径和更多的氢化物形核。加工后的合金具有较高的热稳定性，使其能够在较宽的温度范围内利用难熔高熵合金的严重塑性变形的优势。

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引用次数: 0

Study on elastic properties, fracture toughness, electronic properties and thermal conductivity of the M-Mg(ZnAlCu)2 phase in aluminum alloys via first-principles calculations and experiments 通过第一性原理计算和实验研究铝合金中M-Mg(ZnAlCu)2相的弹性性能、断裂韧性、电子性能和导热性

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-03-01 Epub Date: 2026-01-09 DOI: 10.1016/j.intermet.2026.109159

Shanming Fan , Mingjun Peng , Jun Li , Qing Yu , Lianjian Wen , Mingnie Li

This work investigates the phase stability, elastic properties, fracture toughness, electronic structure, and thermal conductivity of the M-Mg(Zn,Al,Cu)₂ phase using first-principles calculations. Based on the crystal structure of MgZn₂, two distinct doping sites were considered, substituting with Cu and Al atoms, respectively. The results indicate that the doped MgZn₂ is thermodynamically stable, suggesting a high tendency for the M-phase to form. Furthermore, Cu atoms exhibit a strong preference for occupying the Zn sites. The incorporation of Al and Cu atoms enhances the alloy's elastic modulus and anisotropy, while also improving its ductility. Moreover, when Cu occupies the Zn2 site, it simultaneously increases both the thermal conductivity and fracture toughness of MgZn₂. This enhancement is attributed to the strong covalent bonds formed between Cu and its neighboring Zn and Mg atoms, which significantly strengthen the chemical bonding.

本文采用第一性原理计算方法研究了M-Mg(Zn,Al,Cu)2相的相稳定性、弹性性能、断裂韧性、电子结构和导热性。根据MgZn2的晶体结构，考虑了两种不同的掺杂位点，分别用Cu和Al原子取代。结果表明，掺杂后的MgZn2具有良好的热力学稳定性，易于形成m相。此外，Cu原子对占据Zn位点表现出强烈的偏好。Al和Cu原子的掺入提高了合金的弹性模量和各向异性，同时也提高了合金的延展性。此外，当Cu占据Zn2位点时，可以同时提高MgZn2的导热系数和断裂韧性。这种增强是由于Cu与相邻的Zn和Mg原子之间形成的强共价键，这大大加强了化学键。

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引用次数: 0

Effect of true strain on hot deformation behavior and microstructural evolution of Incoloy 825 superalloy 真应变对incoly 825高温合金热变形行为及组织演变的影响

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-03-01 Epub Date: 2026-01-21 DOI: 10.1016/j.intermet.2026.109167

Yuewu Zheng , Yaohui Song , Yugui Li

Vacuum isothermal compression tests were carried out on die-cast Incoloy 825 superalloy using a Gleeble-3800 thermal simulator at 1050 °C and a strain rate of 0.01 s⁻¹. The aim was to systematically investigate its hot deformation behavior and microstructural evolution at different true strain levels. The true stress-true strain curves exhibit a typical work-hardening–softening–steady-state flow behavior, in which dynamic recrystallization (DRX) is the dominant softening mechanism. With increasing true strain, the DRX volume fraction follows a “S” increase. Meanwhile, the average grain size is refined from ∼97.8 μm in the original microstructure to ∼11.2 μm at

ε

= 0.92, where nearly full DRX is achieved and a uniform, fine equiaxed microstructure is obtained. Microstructural analysis indicates that DRX is jointly controlled by discontinuous dynamic recrystallization (DDRX) dominated by grain-boundary bulging and continuous dynamic recrystallization (CDRX) mediated by subgrain rotation. During deformation, low-angle grain boundaries (LAGBs) are progressively transformed into high-angle grain boundaries (HAGBs), whereas the fraction of Σ3 twin boundaries (Σ3 TBs) increases significantly. These changes help to stabilize and refine the recrystallized grains. This study clarifies the coupled roles of DDRX, CDRX and Σ3 TBs during the hot deformation of Incoloy 825 superalloy and provides a strain-based guideline for optimizing its hot-working process and grain boundary engineering design.

采用Gleeble-3800热模拟器，在1050℃、应变速率为0.01 s−1的条件下，对压铸incoly 825高温合金进行了真空等温压缩试验。目的是系统地研究其在不同真应变水平下的热变形行为和微观组织演变。真应力-真应变曲线表现为典型的加工硬化-软化-稳态流动行为，其中动态再结晶（DRX）是主要的软化机制。随着真应变的增大，DRX体积分数呈“S”型增大。同时，在ε = 0.92时，平均晶粒尺寸从原始组织的~ 97.8 μm细化到~ 11.2 μm，实现了几乎完全的DRX，获得了均匀、精细的等轴组织。显微组织分析表明，DRX受以晶界胀形为主的不连续动态再结晶（DDRX）和亚晶旋转为主的连续动态再结晶（CDRX）共同控制。变形过程中，低角晶界（LAGBs）逐渐转变为高角晶界（HAGBs），而Σ3孪晶界（Σ3 TBs）比例显著增加。这些变化有助于稳定和细化再结晶晶粒。本研究阐明了DDRX、CDRX和Σ3 TBs在incoly 825高温合金热变形过程中的耦合作用，为其热加工工艺优化和晶界工程设计提供了基于应变的指导。

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引用次数: 0