Intermetallics最新文献

Creep behavior and deformation mechanisms of a fourth-generation Ni-based single crystal superalloy at intermediate temperatures 第四代镍基单晶高温合金中温蠕变行为及变形机制

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-04-01 Epub Date: 2026-01-27 DOI: 10.1016/j.intermet.2026.109172

Yuning Wang , Xinguang Wang , Zihao Tan , Yongmei Li , Haibing Tan , Yunling Du , Yan Tao , Yanhong Yang , Jide Liu , Jinguo Li , Yizhou Zhou , Xiaofeng Sun

The creep behavior and microscopic deformation mechanisms of a fourth-generation Ru-containing Ni-based single crystal superalloy were investigated at intermediate temperature of 850 °C under high applied stresses of 620, 700, and 750 MPa. SEM and TEM analyses showed that the alloy exhibited a mixed fracture mode mainly composed of micropore coalescence and shear. The γ′ precipitates exhibited stress-dependent rafting, forming relatively regular rafts at lower stress and elongated structures parallel to the loading direction at higher stresses. The alloy shown a low stacking fault energy (SFE) in the γ matrix, as evidenced by a high density of extended stacking faults (SFs) and dislocation configurations in both the γ channels and the γ′ phase. With increasing stress, a/3<112> leading Shockley partial dislocations were activated to shear the γ′ phase and generate SFs. The resulting SF locks and dislocation pile-ups impeded subsequent dislocation motion and provided additional resistance to creep. These low-SFE–controlled dislocation mechanisms govern the creep deformation of this fourth-generation alloy in the intermediate temperature high stress regime and provide mechanistic guidance for the design of high performance single crystal superalloys in service conditions.

研究了第四代含钌镍基单晶高温合金在650、700和750 MPa高应力下850℃的蠕变行为和微观变形机制。SEM和TEM分析表明，该合金呈现以微孔聚结和剪切为主的混合断裂模式。γ′析出相表现出应力依赖性的漂流，在低应力下形成相对规则的漂流，在高应力下形成平行于加载方向的细长结构。合金在γ基体中表现出较低的层错能（SFE），在γ通道和γ′相中均存在高密度的扩展层错（SFs）和位错构型。随着应力的增加，a/3<112>；导致Shockley部分位错被激活，剪切γ′相并产生SFs。由此产生的SF锁和位错堆积阻碍了随后的位错运动，并提供了额外的蠕变阻力。这些低sfe控制的位错机制控制了第四代合金在中温高应力状态下的蠕变变形，为高性能单晶高温合金在服役条件下的设计提供了机理指导。

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引用次数: 0

Boron-modified CoCrCuFeNiTi high-entropy alloys: Microstructural design and coupled high-temperature wear and corrosion performance 硼改性CoCrCuFeNiTi高熵合金：显微组织设计及高温磨损与腐蚀耦合性能

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-04-01 Epub Date: 2026-02-10 DOI: 10.1016/j.intermet.2026.109200

Mikail Aslan , Mehmet Demir , Sefa Emre Sünbül , Mehmet Veysel Çakır , Erdoğan Kanca , Ali Günen

This study systematically investigates the effect of boron (B) addition on the microstructural evolution, mechanical properties, high-temperature wear behavior, and corrosion resistance of CoCrCuFeNiTiB_x (x = 0–1) high-entropy alloys produced via mechanical alloying and powder metallurgy. Phase constitution and microstructural changes were analyzed using XRD and SEM, revealing progressive boride formation and microstructural refinement with increasing boron content. Mechanical characterization demonstrated a pronounced strengthening effect, with hardness increasing from approximately 500 HV in the boron-free alloy to a maximum of 670 HV and a nanohardness of 10.98 GPa for the CoCrCuFeNiTiB_0.7 composition. Tribological tests conducted under room temperature and elevated temperature (650 °C) conditions showed that boron addition fundamentally alters the wear response of the alloys. While wear at room temperature was governed primarily by mechanical abrasion and adhesion, high-temperature sliding induced an oxidation-assisted wear mechanism. Notably, CoCrCuFeNiTiB_0.7 exhibited the lowest wear rates under conditions, achieving 13.79 × 10⁻⁵ mm³/N.m at room temperature and retaining excellent wear resistance at 650 °C with a value of 15.61 × 10⁻⁵ mm³/N.m, indicating remarkable thermal stability. Electrochemical measurements further revealed that this alloy possessed the lowest corrosion current density (icorr = 3.17 × 10⁻³ A/cm²) and the minimum corrosion rate (0.315 mm/y), corresponding to an approximately 7.5-fold improvement compared to the boron-free alloy. Post-wear and post-corrosion SEM–EDX analyses confirmed that the superior performance of the B_0.7 alloy arises from the synergistic effect of boride strengthening and the formation of a dense, adherent oxide layer at elevated temperatures. Overall, the results identify an optimal boron content that enables CoCrCuFeNiTi-based high-entropy alloys to overcome the conventional trade-off between hardness, wear resistance, and corrosion performance, making them highly promising for demanding high-temperature tribological applications.

本研究系统研究了添加硼(B)对机械合金化和粉末冶金制备的CoCrCuFeNiTiBx （x = 0-1）高熵合金的组织演变、力学性能、高温磨损行为和耐蚀性的影响。通过XRD和SEM分析相组成和显微组织的变化，发现硼化物的形成和显微组织的细化随着硼含量的增加而不断进行。力学表征显示出明显的强化效果，硬度从无硼合金的约500 HV增加到最高的670 HV， CoCrCuFeNiTiB0.7的纳米硬度达到10.98 GPa。在室温和高温（650℃）条件下进行的摩擦学试验表明，硼的加入从根本上改变了合金的磨损响应。室温下的磨损主要是由机械磨损和粘附控制的，而高温滑动则诱发氧化辅助磨损机制。值得注意的是，CoCrCuFeNiTiB0.7的磨损率最低，达到13.79 × 10−5 mm3/N。在650℃时保持优异的耐磨性，其值为15.61 × 10−5 mm3/N。M，表明显著的热稳定性。电化学测量进一步表明，该合金具有最低的腐蚀电流密度（icorr = 3.17 × 10−3 A/cm2）和最低的腐蚀速率（0.315 mm/y），与无硼合金相比，大约提高了7.5倍。磨损后和腐蚀后的SEM-EDX分析证实，B0.7合金的优异性能源于硼化物强化和高温下形成致密的氧化层的协同作用。总体而言，研究结果确定了最佳硼含量，使cocrcufeni基高熵合金能够克服硬度、耐磨性和腐蚀性能之间的传统权衡，使其在要求苛刻的高温摩擦学应用中具有很大的前景。

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引用次数: 0

Tribological behavior of nano TiC-reinforced FeCoCrNiMn high entropy alloy composite fabricated by selective laser melting 选择性激光熔化制备纳米tic增强feccrnimn高熵合金复合材料的摩擦学行为

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-04-01 Epub Date: 2026-02-11 DOI: 10.1016/j.intermet.2026.109203

Hamza Osman , Jie Pan , Lin Liu

In this study, the microhardness and tribological behavior of high entropy alloy composite (HEAC) reinforced with nano-TiC particles, fabricated using selective laser melting (SLM), were investigated. The HEAC exhibited higher microhardness and superior tribological properties compared to the pure HEA. The microhardness increased from 236 HV to 464 HV, while the friction coefficient (COF) and wear rate decreased to 0.589 and 0.38 × 10⁻⁵ mm³/N·m, representing reductions of 8.0% and 41.5%, respectively. The wear mechanism of the pure HEA was predominantly adhesive and oxidative, which was attributed to its low hardness and the delamination of large debris on the worn surface. With the addition of nano-TiC particles, the dominant wear mechanism changed to abrasive and oxidative, accompanied by the formation of a thin tribo-oxide layer. This improvement in wear properties is attributed to the addition of nano-TiC in the HEA matrix, which acts as a lubricant on one hand, and increases the microhardness of the HEAC on the other hand.

研究了选择性激光熔化法制备的纳米tic增强高熵合金复合材料（HEAC）的显微硬度和摩擦学性能。与纯HEA相比，HEAC具有更高的显微硬度和优异的摩擦学性能。显微硬度从236 HV提高到464 HV，摩擦系数（COF）和磨损率分别下降到0.589和0.38 × 10−5 mm3/N·m，分别下降了8.0%和41.5%。纯HEA的磨损机制主要是粘附和氧化，这是由于其硬度低，磨损表面有大量碎片的分层。随着纳米tic颗粒的加入，主要的磨损机制转变为磨粒和氧化磨损，并形成薄的氧化摩擦层。这种磨损性能的改善是由于在HEA基体中添加了纳米tic，一方面起到了润滑剂的作用，另一方面提高了HEAC的显微硬度。

引用次数: 0

Effect of heat-treatment on mechanical properties and high-temperature oxidation behavior of Hastelloy X fabricated by laser directed energy deposition 热处理对激光定向能沉积哈氏合金X的力学性能和高温氧化行为的影响

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.2026.109178

Guanghao Gong , Zifan Wang , Longjie Zhao , Fei Weng , Huijun Yu , Zhihuan Zhao , Chuanzhong Chen

In this study, the effect of heat-treatment on the microstructures, mechanical properties, and high-temperature oxidation behavior of Hastelloy X fabricated by laser directed energy deposition was investigated. The solution treatment dissolved Laves phases and increased the grain size resulting in a homogenized γ-matrix with improved ductility but reduced strength. The subsequent aging treatment precipitated fine M₂₃C₆, restoring strength and decreasing ductility. The oxidation tests conducted at 1000 °C up to 100 h revealed that the samples after heat-treatment exhibited a superior resistance due to the oxide consisted of continuous and dense Cr₂O₃ with outer spinels and less spallation behavior. The results reveal that the heat-treatment can achieve a balance between mechanical properties and oxidation resistance by tailoring the microstructures.

研究了热处理对激光定向能沉积法制备的哈氏合金X的显微组织、力学性能和高温氧化行为的影响。固溶处理使Laves相溶解，晶粒尺寸增大，导致γ-基体均匀化，塑性提高，但强度降低。随后的时效处理析出细小的M23C6，恢复了强度，降低了塑性。在1000℃~ 100 h的温度下进行的氧化试验表明，热处理后的样品表现出优异的抗氧化性能，这是由于氧化物由连续致密的Cr2O3组成，外层有尖晶石，很少有剥落行为。结果表明，热处理可以通过调整组织来达到力学性能和抗氧化性能之间的平衡。

引用次数: 0

Effects of Nd substitution and its content on hydrogen storage performance of TiFe-based alloys Nd取代及其含量对tife基合金储氢性能的影响

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-04-01 Epub Date: 2026-02-11 DOI: 10.1016/j.intermet.2026.109202

Zengdong Huang , Bin Song , Chunguang Yang , Zhonggang Han , Jiaxin Li , Xueliang Kang , Hao Sun , Tingting Zhai , Zeming Yuan , Qinghua Hao , Yanghuan Zhang

Alloying with transition metals or rare earth elements is a viable strategy to enhance the sluggish activation kinetics of TiFe-based alloys, which traditionally require severe temperature and pressure conditions for initial hydrogenation. This work investigates a series of alloys with the nominal composition Ti_1.1-xZr_0.1Nd_xFe_0.6Ni_0.3Mn_0.2 (x = 0-0.08), fabricated via vacuum induction melting with varying Nd concentrations. The as-cast microstructure reveals a characteristic multi-phase composition, consisting of a primary Ni-rich TiFe matrix, a secondary ZrMn₂ phase located at the matrix interfaces, and a separate Nd-rich phase. Incorporating Nd resulted in a notable refinement of the grain structure and an increased density of phase boundaries, which significantly reduced the incubation time required for activation. Gaseous hydrogen storage measurements indicated that the Nd-containing alloys exhibit excellent activation performance, achieving full activation in a single cycle at 373 K. The alloy with an Nd content of x = 0.04 achieved a maximum hydrogen absorption saturation rate of 96.9% at 363 K. Furthermore, the magnitudes of the enthalpy (ΔH) and entropy (ΔS) changes for the hydrogen sorption process showed a positive correlation with the Nd content.

过渡金属或稀土元素合金化是改善tife基合金缓慢激活动力学的可行策略，传统上，tife基合金需要苛刻的初始氢化温度和压力条件。本研究采用真空感应熔炼方法制备了一系列标称成分为Ti1.1-xZr0.1NdxFe0.6Ni0.3Mn0.2 （x = 0-0.08）的合金。铸态显微组织显示出典型的多相组成，包括一次富ni fe基体、位于基体界面处的二次ZrMn2相和一个独立的富nd相。加入Nd导致晶粒结构的显著细化和相界密度的增加，这显着减少了激活所需的孵育时间。气体储氢测量表明，含nd合金表现出优异的活化性能，在373 K的单循环中实现完全活化。Nd含量为x = 0.04的合金在363 K时吸氢饱和度达到96.9%。吸附氢过程的焓（ΔH）和熵（ΔS）的变化幅度与Nd含量呈正相关。

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引用次数: 0

Effect of stacking configurations on the magnetic properties and microstructures of hot-deformed Nd-Fe-B magnets 堆积构型对热变形Nd-Fe-B磁体磁性能和显微组织的影响

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-04-01 Epub Date: 2026-02-13 DOI: 10.1016/j.intermet.2026.109204

Yonglin Jiang , Qingzheng Jiang , Jianming Li , Xiaoyu Li , Dongyang Chen , Jinxin Cai , Xiaobin Chen

Nd-Fe-B permanent magnetic materials exhibit excellent coercivity and maximum energy product, making them indispensable key materials in fields such as new energy electric vehicles, humanoid robots, and advanced medical equipment. In this paper, hot-deformed magnets were prepared using Nd-La-Y-Fe-B magnetic powders and commercial Nd-Fe-B magnetic powders with different stacking configurations and the effect of stacking configurations on the magnetic properties, phase compositions, elemental distributions and microstructures of the hot-deformed magnets were explored. Blending Nd-La-Y-Fe-B and commercial Nd-Fe-B magnetic powders in a 1:1 ratio yields a dual-main-phase hot-deformed magnet with optimal performance, achieving a remanence of 13.06 kGs, a coercivity of 12.09 kOe, and a maximum energy product of 40.36 MGOe. Microstructural analysis indicates that the addition of Nd-Fe-B powders can compensate for the deficient rare-earth-rich phase in the Nd-La-Y-Fe-B powders. This results in a thick and continuously distributed grain boundary phase between the main phase grains, while reducing the agglomerated rare-earth-rich regions. Furthermore, stacking configurations show a significant influence on the magnetic performance. Positioning the magnetic powder with poor deformability in the middle region of the magnet enhances grain orientation within the powder, thereby effectively increasing remanence.

钕铁硼永磁材料具有优异的矫顽力和最大的能积，是新能源电动汽车、仿人机器人、先进医疗设备等领域不可或缺的关键材料。采用不同堆积构型的Nd-La-Y-Fe-B磁粉和市售Nd-Fe-B磁粉制备了热变形磁体，探讨了堆积构型对热变形磁体磁性能、相组成、元素分布和显微组织的影响。将Nd-La-Y-Fe-B和商用Nd-Fe-B磁粉以1:1的比例混合，得到了性能最佳的双主相热变形磁体，剩余物为13.06 kGs，矫顽力为12.09 kOe，最大能量积为40.36 MGOe。显微组织分析表明，Nd-Fe-B粉末的加入可以弥补Nd-La-Y-Fe-B粉末中富稀土相的不足。这使得主相晶粒之间的晶界相较厚且连续分布，同时减少了富集稀土区的团聚。此外，堆积构型对磁性能有显著影响。将可变形性差的磁粉定位在磁体的中间区域，增强了粉末内部的晶粒取向，从而有效地增加了剩磁。

{"title":"Effect of stacking configurations on the magnetic properties and microstructures of hot-deformed Nd-Fe-B magnets","authors":"Yonglin Jiang , Qingzheng Jiang , Jianming Li , Xiaoyu Li , Dongyang Chen , Jinxin Cai , Xiaobin Chen","doi":"10.1016/j.intermet.2026.109204","DOIUrl":"10.1016/j.intermet.2026.109204","url":null,"abstract":"<div><div>Nd-Fe-B permanent magnetic materials exhibit excellent coercivity and maximum energy product, making them indispensable key materials in fields such as new energy electric vehicles, humanoid robots, and advanced medical equipment. In this paper, hot-deformed magnets were prepared using Nd-La-Y-Fe-B magnetic powders and commercial Nd-Fe-B magnetic powders with different stacking configurations and the effect of stacking configurations on the magnetic properties, phase compositions, elemental distributions and microstructures of the hot-deformed magnets were explored. Blending Nd-La-Y-Fe-B and commercial Nd-Fe-B magnetic powders in a 1:1 ratio yields a dual-main-phase hot-deformed magnet with optimal performance, achieving a remanence of 13.06 kGs, a coercivity of 12.09 kOe, and a maximum energy product of 40.36 MGOe. Microstructural analysis indicates that the addition of Nd-Fe-B powders can compensate for the deficient rare-earth-rich phase in the Nd-La-Y-Fe-B powders. This results in a thick and continuously distributed grain boundary phase between the main phase grains, while reducing the agglomerated rare-earth-rich regions. Furthermore, stacking configurations show a significant influence on the magnetic performance. Positioning the magnetic powder with poor deformability in the middle region of the magnet enhances grain orientation within the powder, thereby effectively increasing remanence.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"191 ","pages":"Article 109204"},"PeriodicalIF":4.8,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unraveling the origin of lattice distortion in Co-Cr-Fe-Ni-Mn system via electronic structure analysis 用电子结构分析揭示Co-Cr-Fe-Ni-Mn体系晶格畸变的起源

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-04-01 Epub Date: 2026-01-26 DOI: 10.1016/j.intermet.2026.109163

He Qu , Wei Zhang , Qingchun Xiang , Yinglei Ren , Weidong Liu , Keqiang Qiu

Lattice distortion is a critical structural characteristic in alloys that significantly influences their mechanical properties. This work employs density functional theory (DFT) and empirical electron theory of solids and molecules (EET) to investigate the lattice distortion in the CoCrFeNiMn alloy and its sub-alloys (such as CoNi, FeNi, CoFeNi, CoNiMn, FeNiMn, CoCrNi, CoFeNiMn, CoCrFeNi, and CoCrNiMn). The results show that the number of covalent electrons in valence electrons is a key factor affecting lattice distortion. Specifically, a smaller number of covalent electrons in a bond weakens the interatomic force, facilitating atomic displacement from equilibrium positions and thereby enhancing lattice distortion. Among the studied elements, Cr causes the most significant local bond length fluctuation and the largest lattice distortion, followed by Mn, Fe, Co and Ni. Mechanical property tests were conducted on the CoNi, CoNiMn, and CoCrNi alloys with significant differences in lattice distortion. The results indicate that the variation trend of the yield strength (53, 68 and 92 MPa) aligns with that of the lattice distortion (0.73 %, 0.94 % and 1.37 %) for the three alloys.

晶格畸变是影响合金力学性能的重要结构特征。本文采用密度泛函理论（DFT）和固体与分子经验电子理论（EET）研究了CoCrFeNiMn合金及其亚合金（如CoNi、FeNi、CoFeNi、CoNiMn、FeNiMn、CoCrNi、CoFeNiMn、CoCrFeNi和CoCrNiMn）的晶格畸变。结果表明，价电子中共价电子数是影响晶格畸变的关键因素。具体来说，键中共价电子的数量越少，原子间的相互作用力就会减弱，从而使原子从平衡位置位移，从而增强晶格畸变。在所研究的元素中，Cr引起的局域键长波动最显著，晶格畸变最大，其次是Mn、Fe、Co和Ni。对晶格畸变有显著差异的CoNi、CoNiMn和CoCrNi合金进行了力学性能测试。结果表明：三种合金屈服强度（53、68和92 MPa）的变化趋势与晶格畸变（0.73%、0.94%和1.37%）的变化趋势一致；

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引用次数: 0

Insight into how Sn content and annealing temperature dictate microstructural characteristics to regulate the superelasticity in Ti-Zr-Nb-Sn alloys 研究了锡含量和退火温度如何影响Ti-Zr-Nb-Sn合金的微观组织特征以调节其超弹性

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.2026.109164

Shuanglei Li , Siyu Yuan , Peng Wu , Su-Young Kim , Tae-Hyun Nam , Jong-Taek Yeom , Xu Wang

Toxic element-free β-type Ti-Zr-Nb-Sn shape memory alloys offer exceptional potential for advanced biomedical applications, yet achieving optimal superelasticity requires precise control of alloy composition and microstructure, which is particularly sensitive to the interplay between Sn content and annealing conditions. This study systematically investigates the effects of Sn content (3.5–5 at%) and annealing temperature (850–1100 °C) on the microstructure, texture evolution, and superelastic behavior of cost-effective Ti-20Zr-9Nb-xSn alloys. A strong {001}_β<110>_β recrystallization texture, vital for maximizing the transformation strain of β → α″, is found to develop under a precise synergy of Sn content and annealing treatment. We found that its formation is governed by two factors: (i) a low valence electron-to-atom (e/a) ratio (4.0–4.15), which ensures low β-phase stability and promotes unconventional deformation textures, and (ii) the achievement of a critical, composition-dependent β grain size during annealing. Excessive Sn promotes Zr₅Sn₃-type second phase formation, which retards recrystallization via Zener pinning, thereby weakening {001}_β<110>_β texture development and necessitating higher annealing temperatures. The Ti-20Zr-9Nb-5Sn alloy annealed at 950 °C exhibited a maximum recovery strain of 4.8 %, demonstrating that tailored thermomechanical processing can simultaneously optimize microstructure and transformation conditions for optimizing superelasticity. Above all, this study, for the first time, proposes a new superelastic region in the conventional

\overline{B_{o}} - \overline{M_{d}}

diagram for predicting novel superelastic β Ti-Zr-based alloys. The presented linking of Sn content and annealing temperature to functional performance establishes fundamental guidelines for optimizing alloy composition and thermomechanical processing, providing a foundation for developing high-performance Ti-Zr-Nb-Sn superelastic alloys for potential biomedical applications.

不含有毒元素的β型Ti-Zr-Nb-Sn形状记忆合金为先进的生物医学应用提供了巨大的潜力，但要实现最佳的超弹性，需要精确控制合金成分和微观结构，这对锡含量和退火条件之间的相互作用特别敏感。本研究系统地研究了Sn含量（3.5 ~ 5 at%）和退火温度（850 ~ 1100℃）对高性价比Ti-20Zr-9Nb-xSn合金显微组织、织构演变和超弹性行为的影响。在Sn含量和退火处理的精确协同作用下，形成了强{001}β<；110>；β再结晶织构，这对最大化β→α″的转变应变至关重要。我们发现它的形成是由两个因素决定的：(i)低价电子与原子（e/a）比（4.0-4.15），这确保了低β相稳定性并促进了非常规的变形织构；（ii）在退火过程中实现了临界的、与成分相关的β晶粒尺寸。过量的Sn促进了zr5sn3型第二相的形成，阻碍了齐纳钉钉再结晶，从而削弱了{001}β<；110>；β织构的发展，需要更高的退火温度。950℃退火后的Ti-20Zr-9Nb-5Sn合金的最大恢复应变为4.8%，表明定制化热处理可以同时优化组织和转变条件以优化超弹性。首先，这项研究首次在传统的Bo - Md形式中提出了一个新的超弹性区域，用于预测新型的超弹性β ti - zr基合金。提出的锡含量和退火温度与功能性能之间的联系为优化合金成分和热机械加工提供了基本指导，为开发具有潜在生物医学应用前景的高性能Ti-Zr-Nb-Sn超弹性合金奠定了基础。

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引用次数: 0

Environment dependent Ta-Mo synergy toward eutectic high-entropy alloys with strength and tunable corrosion resistance 环境依赖Ta-Mo协同作用对高熵共晶合金的强度和可调耐蚀性

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-04-01 Epub Date: 2026-01-29 DOI: 10.1016/j.intermet.2026.109180

Jiajun Yuan , Zengmin Shi , Lei Dai , Xicong Ye , Long Xu , Junwen Gao , Panxing Liu

Conventional alloy design often targets a single universally optimal composition. This paradigm is challenged by a ‘threat-matched’ synergistic alloying strategy in (CoCrFeNi)₈₅Ta_xMo_15-x eutectic high-entropy alloys (EHEAs), prepared by vacuum arc melting, enabling remarkable environment-specific performance. Systematic tuning of the Ta/Mo ratio yields a eutectic (CoCrFeNi)₈₅Ta₅Mo₁₀ alloy with exceptional properties of ∼1.7 GPa yield strength and 31.7 % fracture strain. Notably, corrosion resistance shifts with environment. In 0.6 M NaCl, a high-Ta alloy (TM10-5) offers a superior protection via a robust Ta₂O₅ barrier; in aggressive 0.6 M NH₄Cl, the optimal composition shifts to a balanced Ta/Mo ratio (TM7.5–7.5). This adaptability stems from a dynamic interplay where Mo's chemical stabilization is amplified to counter NH₄Cl's complex acidic and ion-complexing attack. This study validates a pathway for designing advanced EHEAs, where tailored synergistic alloying counters specific environmental threats, boosting reliability for demanding applications.

传统的合金设计通常以单一的普遍最佳成分为目标。这种模式受到了（CoCrFeNi）85TaxMo15-x共晶高熵合金（EHEAs）的“威胁匹配”协同合金化策略的挑战，该合金通过真空电弧熔化制备，具有卓越的环境特定性能。系统调整Ta/Mo比可得到一种共晶（CoCrFeNi）85Ta5Mo10合金，其屈服强度为~ 1.7 GPa，断裂应变为31.7%。值得注意的是，耐腐蚀性随环境变化而变化。在0.6 M NaCl中，高ta合金（TM10-5）通过强大的Ta2O5屏障提供卓越的保护；在侵略性为0.6 M的NH4Cl中，最佳组成转变为平衡的Ta/Mo比（TM7.5-7.5）。这种适应性源于一种动态的相互作用，其中Mo的化学稳定性被放大以对抗NH4Cl的复杂酸性和离子络合攻击。该研究验证了设计先进EHEAs的途径，其中定制的协同合金可以应对特定的环境威胁，提高高要求应用的可靠性。

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引用次数: 0

The influence of hydrogen on the synthesis of γ-TiAl alloys containing Nb, Cr and Mn by non-traditional Hydride Cycle method 氢对非传统氢化物循环法制备Nb、Cr、Mn γ-TiAl合金的影响

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.2026.109195

Garnik Muradyan , Seda Dolukhanyan , Ofelya Ter-Galstyan , Nune Mnatsakanyan , Salavat Khasanov , Sona Mardanyan , Edita Vardanyan , Armen Hovhannisyan

This work describes a new technology for synthesis of Ti-47.5Al-2Cr/Mn-2Nb alloys by sequential applying two methods: Self-propagating High-temperature Synthesis (SHS) of metal hydrides, and Hydride Cycle (HC) formation of metal alloys from obtained hydrides. Four compositions are synthesized: Ti-47.5Al-2Cr-2Nb, Ti-47.5Al-2Mn-2Nb, Ti-47.5Al-2Cr-2Mn-2Nb and Ti-47.5Al-1Cr-1Mn-2Nb. To get the alloy by the developed method, titanium and niobium hydrides are first synthesized in SHS; then alloys of the specified compositions are produced in HC from these hydrides. The influence of doping additives Cr, Mn and Nb on several characteristics of the alloys is defined. Tetragonal γ-TiAl phase was synthesized, containing 11–22% of hexagonal α₂-Ti₃Al phase. Thermograms of HC processes, DTA curves, and the absence of melting traces on the surface of the samples indicate a solid-phase diffusion mechanism of the reaction of formation of all studied compositions in HC. The advantages of this method over traditional ones are: diminishing of operating temperatures from 1800-2600 to 600–1000 °C, and of process duration from tens to 1.0–2 h; single-stage and environmentally friendly process of formation of multicomponent alloys of a given chemical and phase composition, without multiple re-melting. These advantages ensure lower energy consumption and low manufacturing cost of alloys.

本文介绍了一种新的合成Ti-47.5Al-2Cr/Mn-2Nb合金的新技术，该技术采用了金属氢化物的自蔓延高温合成（SHS）和金属氢化物的氢化物循环形成（HC）两种方法。合成了Ti-47.5Al-2Cr-2Nb、Ti-47.5Al-2Mn-2Nb、Ti-47.5Al-2Cr-2Mn-2Nb和Ti-47.5Al-1Cr-1Mn-2Nb四种成分。为了得到该合金，首先在SHS中合成了钛和铌的氢化物；然后用这些氢化物在HC中生产特定成分的合金。确定了掺杂添加剂Cr、Mn和Nb对合金若干特性的影响。合成了含有11-22%六方α2-Ti3Al相的四方γ-TiAl相。HC过程的热像图、DTA曲线和样品表面没有熔化痕迹表明HC中所有研究成分的反应形成都是固相扩散机制。与传统方法相比，该方法的优点是：工作温度从1800-2600℃降低到600-1000℃，工艺时间从几十小时缩短到1.0-2小时；单阶段和环境友好的过程，形成多组分合金的给定的化学和相组成，没有多次重熔。这些优点保证了合金的低能耗和低制造成本。

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引用次数: 0