Intermetallics最新文献_第2页

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 : 2026-01-23 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

High mechanical and tribological performance and mechanisms of TiZrHfNbAlx refractory high-entropy alloys TiZrHfNbAlx耐火高熵合金的高力学和摩擦学性能及其机理

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-01-22 DOI: 10.1016/j.intermet.2026.109165

Yajuan Shi , Yi Wang

In this work, a series of TiZrHfNbAl_x (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) refractory high-entropy alloys (RHEAs) are synthesized by vacuum arc-melting techniques, and the effect of Al concentration on microstructure and wear properties were investigated. All alloys exhibit a single BCC structure. Interestingly, when x reaches 0.8, a new ordered BCC phase appears. As the increase in Al content, the hardness increased from 245 HV to 447 HV and the compressive yield strength (CYS) increased from 572 MPa to 1468 MPa for TiZrHfNb and TiZrHfNbAl_1.0 RHEAs, respectively. Meanwhile, the addition of Al significantly enhances the wear resistance of the RHEAs, the wear volume of TiZrHfNbAl_1.0 alloy decreased by 37.5 % in contrast with TiZrHfNb alloy. The above excellent performance of the TiZrHfNbAl_1.0 alloy was attributed to the synergistic effect of solid solution strengthening, ordered phase strengthening and a transformation of the wear mechanism.

采用真空电弧熔炼技术合成了一系列TiZrHfNbAlx （x = 0,0.2, 0.4, 0.6, 0.8, 1.0）耐火高熵合金（RHEAs），研究了Al浓度对合金组织和磨损性能的影响。所有合金均呈现单一的BCC结构。有趣的是，当x达到0.8时，出现了一个新的有序的BCC阶段。随着Al含量的增加，TiZrHfNb和TiZrHfNbAl1.0合金的硬度从245 HV增加到447 HV，抗压屈服强度（CYS）分别从572 MPa增加到1468 MPa。同时，Al的加入显著提高了合金的耐磨性，TiZrHfNbAl1.0合金的磨损体积比TiZrHfNb合金减少了37.5%。TiZrHfNbAl1.0合金的上述优异性能是固溶强化、有序相强化和磨损机理转变的协同作用的结果。

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 : 2026-01-21 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

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 : 2026-01-21 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

The influence of precipitates on the indentation creep behavior of (CoCrFeNi)94Ti2Al4 alloy 析出相对（CoCrFeNi）94Ti2Al4合金压痕蠕变行为的影响

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-01-21 DOI: 10.1016/j.intermet.2026.109169

Jiaohui Yan , Fei Hou , Lei Li , Di Wan , Xun Guo , Ke Jin , Yunfei Xue

This study investigates the influence of precipitate size on the room-temperature indentation creep behavior of (CoCrFeNi)₉₄Ti₂Al₄ high-entropy alloy by using nanoindentation system equipped with Berkovich diamond indenter combined with microstructural characterization. Nano-hardness, creep displacement, and creep strain rate of specimens with different sizes of nanoscale precipitates were analyzed under conditions of a 20 mN peak load and a 0.5 mN/s loading rate. Results show that precipitate refinement enhances the alloy hardness and reduces the total creep depth, while the steady-state creep rate increases slightly with an insignificant increment. When the testing conditions (loading rate and peak load) were changed, although the trend of inhibiting total creep displacement by precipitate refinement remained unchanged, the effect of precipitate refinement on the steady-state creep rate was not significant. Additionally, creep analysis using a spherical indenter were conducted to calculate the creep stress exponent n. Results showed that the precipitate-containing alloy exhibited a higher n value than the precipitate-free alloy, with dislocation creep identified as the dominant deformation mechanism in both cases. This study enables rapid screening of materials via nanoindentation creep, provides deeper mechanistic insights into the creep deformation of precipitation-strengthened high-entropy alloys, and establishes a theoretical framework for property optimization.

采用配备Berkovich金刚石压头的纳米压痕系统结合显微组织表征，研究了析出相尺寸对（CoCrFeNi）94Ti2Al4高熵合金室温压痕蠕变行为的影响。在峰值载荷为20 mN、加载速率为0.5 mN/s的条件下，分析了不同尺寸纳米析出物试样的纳米硬度、蠕变位移和蠕变应变率。结果表明：析出相细化提高了合金硬度，降低了总蠕变深度，而稳态蠕变速率略有增加，但增幅不显著；当试验条件（加载速率和峰值载荷）发生变化时，虽然析出相细化抑制总蠕变位移的趋势保持不变，但析出相细化对稳态蠕变速率的影响不显著。此外，利用球面压头进行蠕变分析，计算蠕变应力指数n。结果表明，含析出相合金的n值高于无析出相合金，位错蠕变是两种情况下的主要变形机制。该研究使通过纳米压痕蠕变快速筛选材料成为可能，为沉淀强化高熵合金的蠕变变形提供了更深入的机理见解，并为性能优化建立了理论框架。

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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 : 2026-01-20 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

High performance Co-doped FeSiBC amorphous alloys for extreme aquatic environments 用于极端水生环境的高性能共掺杂FeSiBC非晶合金

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-01-19 DOI: 10.1016/j.intermet.2026.109173

Yijun Ding , Senkuan Meng , Jianfeng Wang , Xiaotong Sun , Hao Xie , Yiwei Liu , Xin Wang , Weimin Wang , Lina Hu , Zheng Wang

Corrosive conditions in extreme aquatic environments currently constrain the application of Fe-based amorphous alloys, which see extensive use in fields dedicated to dual carbon and energy efficiency due to their superior soft-magnetic properties. Enhancing the corrosion resistance of Fe-based amorphous alloys holds both scientific and engineering significance. In this work, new alloys with high corrosion resistance have been developed by Co doping on the basis of commercially available FeSiBC amorphous alloy. The Co-doped alloys exhibit a denser atomic arrangement and suppressed heterogeneous structural defects. These characteristics contribute to the formation of a more stable and corrosion-resistant passive film in corrosive media, composed of Fe and Co oxides. The strategy of enhancing the corrosion resistance of amorphous alloys through Co doping has been validated under extreme aquatic conditions, including high ion concentrations, elevated temperature and complex microbial environment. Moreover, the addition of Co helps maintain a high proportion of iron group elements, preserving the excellent magnetic properties and other advantages of Fe-based amorphous alloys. This dual-focus strategy, balancing practicality and functionality, holds significant value for engineering applications.

极端水环境中的腐蚀条件目前限制了铁基非晶合金的应用，由于其优越的软磁性能，铁基非晶合金在双碳和能源效率领域得到了广泛的应用。提高铁基非晶合金的耐腐蚀性能具有重要的科学意义和工程意义。本文在市售FeSiBC非晶合金的基础上，通过Co掺杂制备了具有高耐蚀性的新型合金。共掺杂合金表现出更致密的原子排列和抑制非均质结构缺陷。这些特性有助于在由Fe和Co氧化物组成的腐蚀性介质中形成更稳定和耐腐蚀的钝化膜。在高离子浓度、高温和复杂的水生微生物环境等极端条件下，通过Co掺杂提高非晶合金耐腐蚀性能的策略得到了验证。此外，Co的加入有助于保持铁族元素的高比例，保持铁基非晶合金优异的磁性能等优点。这种平衡实用性和功能性的双焦点策略对工程应用具有重要价值。

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引用次数: 0

Effects of palladium substitution on structural evolution and electrochemical properties of BCC solid solution alloys coexisting with Laves phase 钯取代对Laves相共存的BCC固溶体合金结构演变及电化学性能的影响

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-01-17 DOI: 10.1016/j.intermet.2026.109161

ZhiYuan Cao , GuangBo Shi , YaNan Fang , Kwo Young , HongMei Qiu , Muhammad Irfan Nawaz , Amjad Ali , Ghulam Murtaza , ChuBin Wan

In this study, a series of BCC solid solution hydrogen storage alloys coexisting with C14 Laves phase, Ti_13.6Zr_2.1V₄₄Cr_13.2Mn_6.9Fe_2.7Co_1.4Ni_15.7-xAl_0.3Pd_x (x = 0.5, 1.0, 1.5, and 2.0), were successfully synthesized and systematically investigated. The results indicate that the introduction of palladium can significantly modify the phase fractions of C14 and BCC, while simultaneously reducing the unit cell volume of the C14 phase. Electrochemical performance tests reveal that, within a specific palladium content range, the initial discharge capacity improves significantly, rising from ∼330 mAh/g in Pd_0.5 to ∼385 mAh/g in Pd_2.0. Regarding cycle stability, the Pd_1.5 alloy exhibits a capacity retention rate of 80 % after 200 cycles, significantly outperforming the 51 % retention of Pd_0.5. Additionally, Pd_1.5 exhibits the highest exchange current density (84.7 mA g⁻¹), the fastest hydrogen diffusion coefficient (15.4 × 10⁻¹⁰ cm² s⁻¹), and the lowest charge transfer resistance (3.9 Ohm), indicating the superior high-rate discharge capability in the studied alloys. These findings provide valuable guidance for the design of advanced hydrogen storage alloys and highlight their potential for practical fuel cell applications.

本研究成功合成了一系列与C14 Laves相共存的BCC固溶储氢合金ti13.6 zr2.1 v44cr13.2 mn6.9 fe2.7 co1.4 ni15.7 xal0.3 pdx (x = 0.5, 1.0, 1.5, 2.0)，并对其进行了系统的研究。结果表明，钯的引入可以显著改变C14和BCC的相分数，同时减小C14相的单位电池体积。电化学性能测试表明，在特定钯含量范围内，初始放电容量显著提高，从Pd0.5的~ 330 mAh/g提高到Pd2.0的~ 385 mAh/g。在循环稳定性方面，Pd1.5合金在200次循环后的容量保留率为80%，明显优于Pd0.5合金的51%保留率。此外，Pd1.5具有最高的交换电流密度（84.7 mA g−1）、最快的氢扩散系数（15.4 × 10−10 cm2 s−1）和最低的电荷转移电阻（3.9 Ohm），表明该合金具有优异的高倍率放电能力。这些发现为先进储氢合金的设计提供了有价值的指导，并突出了它们在实际燃料电池应用中的潜力。

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引用次数: 0

Divergent machinability and deformation mechanisms in directed energy deposited CrCoNi and (CrCoNi)94Al3Ti3 medium-entropy alloys 定向能沉积CrCoNi和（CrCoNi）94Al3Ti3中熵合金的可加工性及变形机制

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-01-16 DOI: 10.1016/j.intermet.2026.109162

Chunyu Tong , Zekai Liu , Ting Yue , Sulin Chen , Bin Shen

Although medium-entropy alloys (MEAs) fabricated by additive manufacturing hold great industrial potential, the fundamental role of Al/Ti alloying in machining-induced subsurface deformation remains unexplored. This study systematically investigates the machinability and deformation mechanisms of CrCoNi and (CrCoNi)₉₄Al₃Ti₃ alloys fabricated via directed energy deposition (DED) through an integrated analysis of the cutting forces, surface integrity, and EBSD-based subsurface characterization. Compared to CrCoNi, (CrCoNi)₉₄Al₃Ti₃ exhibits 11.8 % higher cutting forces, which is associated with enhanced resistance to plastic deformation arising from grain refinement and Al/Ti-enriched microstructural features, while achieving an 18.3 % lower surface roughness due to strain hardening that suppresses lateral material flow. The non-monotonic cutting-force behavior under a constant material removal rate is interpreted as a transition from compression-dominated ploughing to shear-dominated chip formation. Fundamental differences in subsurface mechanisms were revealed: CrCoNi developed stress-relieving recrystallization with gradient grains, whereas (CrCoNi)₉₄Al₃Ti₃ exhibited 70.4 % higher near-surface strain hardening owing to dislocation accumulation. Optimal parameters (v_c = 1000 mm/s, f_z = 0.05 mm/z, a_p = 0.15 mm) were identified to simultaneously maximize the machining efficiency and surface quality. These findings provide new insights into alloy design for machinability by elucidating how Al/Ti modification alters the deformation pathways in additively manufactured MEAs during cutting, thereby offering practical guidelines for the precision manufacturing of complex components.

虽然增材制造制造的中熵合金（MEAs）具有巨大的工业潜力，但Al/Ti合金在加工诱发的地下变形中的基本作用仍未被探索。本研究通过对切削力、表面完整性和基于ebsd的亚表面表征的综合分析，系统地研究了定向能沉积（DED）制备的CrCoNi和（CrCoNi）94Al3Ti3合金的可加工性和变形机制。与CrCoNi相比，（CrCoNi）94Al3Ti3的切削力提高了11.8%，这与晶粒细化和Al/ ti丰富的显微组织特征引起的塑性变形的抵抗能力增强有关，而由于抑制材料横向流动的应变硬化，表面粗糙度降低了18.3%。恒定材料去除率下的非单调切削力行为被解释为从压缩主导的犁耕到剪切主导的切屑形成的转变。在亚表面机制上的根本差异揭示了：CrCoNi发生了梯度晶粒的应力消除再结晶，而（CrCoNi）94Al3Ti3由于位错积累而表现出70.4%的近表面应变硬化。确定了最优加工参数（vc = 1000 mm/s, fz = 0.05 mm/z, ap = 0.15 mm），以最大限度地提高加工效率和表面质量。这些发现通过阐明Al/Ti改性如何改变增材制造mea在切削过程中的变形路径，为合金可加工性设计提供了新的见解，从而为复杂部件的精密制造提供了实用指南。

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引用次数: 0

Influence of Al and Ti on precipitation behavior and corrosion resistance in CoCrNi alloys Al和Ti对CoCrNi合金析出行为和耐蚀性的影响

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-01-16 DOI: 10.1016/j.intermet.2026.109168

M.K. Xu, A.X. Li, K.W. Kang, S.B. Yu, S.K. Liu, Y.T. Jiang, B.R. Zhang, Y.Q. Li, G. Li

This study explores the corrosion behavior of CoCrNi(AlTi)_x medium entropy alloys with varying Al and Ti additions (x = 0, 0.05, 0.10, 0.15), focusing on the influence of L1₂ precipitates in Cl rich environments. Electrochemical tests in 3.5 wt% NaCl solution demonstrate that the alloy with moderate AlTi content (x = 0.05) exhibits the best corrosion resistance, characterized by a corrosion current density of 45 ± 6 nA/cm², a pitting potential of 857 ± 13 mV (vs. Ag/AgCl), and an extended passivation region spanning approximately 0.5–1.6 V (vs. Ag/AgCl). Increasing the AlTi concentration leads to a higher volume fraction of L1₂ precipitates, which correlates with increased corrosion current densities and reduced passivation stability. These variations in electrochemical performance are attributed to changes in precipitate distribution and their effect on passive film stability under Cl⁻. The findings highlight the critical role of controlled L1₂ precipitation in optimizing corrosion resistance in CoCrNi alloys.

本研究探讨了不同Al和Ti添加量（x = 0, 0.05, 0.10, 0.15）下CoCrNi(AlTi)x中熵合金的腐蚀行为，重点研究了在富Cl环境中L12析出物的影响。在3.5 wt% NaCl溶液中的电化学测试表明，AlTi含量（x = 0.05）中等的合金具有最佳的耐蚀性，腐蚀电流密度为45±6 nA/cm2，点蚀电位为857±13 mV（相对于Ag/AgCl），钝化区扩展约为0.5-1.6 V（相对于Ag/AgCl）。AlTi浓度的增加导致L12析出相体积分数的增加，这与腐蚀电流密度的增加和钝化稳定性的降低有关。这些电化学性能的变化归因于沉淀分布的变化及其对Cl−下钝化膜稳定性的影响。研究结果强调了控制L12析出对优化CoCrNi合金耐蚀性的关键作用。

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引用次数: 0