Surface & Coatings Technology最新文献_第4页

Aging strengthening and interface self–healing of cold–sprayed CuCrZr alloy coatings CuCrZr合金冷喷涂涂层的时效强化与界面自愈

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2026-01-16 DOI: 10.1016/j.surfcoat.2026.133196

Yuxin Jue , Jiayi He , Zikai Wu , Chen Wang , Jing Lu , Fenghua Luo

The cold–sprayed CuCrZr alloy coating was peeled off from the substrate, and the effects of annealing at 450 °C for 60 min on its microstructure, mechanical properties and thermal conductivity were studied. The results indicate that severe deformation occurs near the particle–particle interface, leading to the formation of nanocrystals. The deformation hardening of particles leads to an increase in the hardness of the cold–sprayed coating. Compared with the as–built CuCrZr alloy obtained by selective laser melting, the hardness of the cold–sprayed CuCrZr alloy increases by approximately 87% from 84 HV0.1 to 157 HV0.1. The pores and weak interfaces between mechanically interlocked particles lead to the brittleness of the coating. However, annealing can repair nanoscale pores and self–healing particle–particle interface bonding, and the precipitation of Cr–rich phase leads to aging strengthening, thereby improving the tensile strength and thermal conductivity of CuCrZr coatings. After annealing, the hardness, tensile strength, and thermal conductivity of the coating are all improved. Specifically, the hardness increased from 157 HV0.1 to 223 HV0.1, an increase of approximately 42%; The tensile strength increased from 61 MPa to 170 MPa, an increase of approximately 179%; The thermal conductivity increased from 91 W/(m·K) to 217 W/(m·K), an increase of 138%.

将冷喷涂CuCrZr合金涂层从基体上剥离，研究了450℃60 min退火对涂层组织、力学性能和导热性能的影响。结果表明，颗粒-颗粒界面附近发生剧烈变形，导致纳米晶体的形成。颗粒的变形硬化导致冷喷涂涂层硬度的提高。与选择性激光熔化制备的CuCrZr合金相比，冷喷涂CuCrZr合金的硬度从84 HV0.1提高到157 HV0.1，提高了约87%。机械互锁颗粒之间的孔隙和弱界面导致涂层脆性。而退火可以修复纳米级孔隙和自愈颗粒-颗粒界面键合，富cr相的析出导致时效强化，从而提高CuCrZr涂层的抗拉强度和导热系数。退火后涂层的硬度、抗拉强度、导热系数均有提高。硬度从157 HV0.1提高到223 HV0.1，提高了约42%；抗拉强度由61 MPa提高到170 MPa，提高了约179%；导热系数由91 W/（m·K）提高到217 W/(m·K)，提高了138%。

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引用次数: 0

Corrigendum to “Study on the energy of nitrogen-containing borate ester organomolybdenum additives combined with ZDDP” [Surf. Coat. Technol. 522 (2026) 133152] 《含氮硼酸酯类有机钼添加剂与ZDDP复合的能量研究》的勘误[j]。外套。科技。522 (2026)133152]

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2026-01-16 DOI: 10.1016/j.surfcoat.2026.133183

Hongping Qiu , Wenbin Hu , Jingzhou Liu , Longhai Li , Sifan Jiang , Keyi Bao , Sheng Han , Jincan Yan

引用次数: 0

Improvement in electrochemical behaviour of Ti-6Al-4V alloy by ultrasonic-assisted abrasive peening 超声辅助磨料强化对Ti-6Al-4V合金电化学性能的改善

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2026-01-16 DOI: 10.1016/j.surfcoat.2026.133198

S.V.V.N. Siva Rao , Darothi Bairagi , Sumantra Mandal , N.D. Chakladar , Soumitra Paul

In a physiological environment, corrosion resistance and prolonged durability of a biomedical component are crucial. Hence, metallic materials exhibiting surface deformation with minimal change in surface roughness are preferred. Ultrasonic-assisted abrasive peening (UAP) is a process that can treat a metallic material to render the above characteristics. Furthermore, UAP is an emerging technique that has been under investigation over the past decade. As a result, research on this technique is still evolving, and its influence on the electrochemical behaviour of Ti-6Al-4V alloy has not yet been reported. Therefore, this study attempted to investigate its impact by treating the Ti-6Al-4V samples for 0 (unpeened), 1, 3, and 6 min. The peened samples exhibited significant residual stresses, reaching 70%, 80%, and 84% of the yield strength, while maintaining roughness of 22.6 nm, 28.4 nm, and 32 nm with increase in peening duration. Peening improved surface wettability, reducing the contact angle from 64.4^o in the unpeened sample to 33.4°, 41°, and 49.2° for peening durations of 1, 3, and 6 min, respectively. Further, transmission electron microscopy depicted a nano-grain structure of 56.6 nm and 30.5 nm corresponding to 1 min and 3 min of peening. The electrochemical studies showed an improvement in breakdown potential with peening duration. Specifically, the 6 min peening exhibited the highest potential of 2.45 V, while the unpeened sample had a 1.95 V breakdown potential. The study concluded that a UAP treatment can tailor the microstructure and improve the pitting resistance of Ti-6Al-4V alloy.

在生理环境中，生物医学部件的耐腐蚀性和持久耐用性至关重要。因此，表现出表面变形且表面粗糙度变化最小的金属材料是优选的。超声辅助磨料强化（UAP）是一种处理金属材料使其具有上述特性的工艺。此外，UAP是一种新兴技术，在过去十年中一直在研究中。因此，该技术的研究仍在不断发展，其对Ti-6Al-4V合金电化学行为的影响尚未见报道。因此，本研究试图通过处理Ti-6Al-4V样品0（未打开）、1、3和6分钟来研究其影响。随着喷丸时间的延长，喷丸样品的残余应力显著，分别达到屈服强度的70%、80%和84%，粗糙度分别保持在22.6 nm、28.4 nm和32 nm。喷丸改善了表面润湿性，在喷丸持续时间为1、3和6分钟时，将未喷丸样品的接触角从64.40°降低到33.4°、41°和49.2°。此外，透射电子显微镜显示了56.6 nm和30.5 nm的纳米颗粒结构，对应于1 min和3 min的强化。电化学研究表明，随着喷丸时间的延长，击穿电位有所提高。具体来说，6分钟喷丸处理的样品击穿电位最高，为2.45 V，而未喷丸处理的样品击穿电位为1.95 V。研究结果表明，UAP处理可以使Ti-6Al-4V合金的显微组织更加个性化，提高其抗点蚀性能。

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引用次数: 0

Thermal stability and tribological properties of HiPIMS Cr2O3 coatings with varied pulse widths 不同脉冲宽度下hiims Cr2O3涂层的热稳定性和摩擦学性能

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2026-01-15 DOI: 10.1016/j.surfcoat.2026.133201

Jiale Weng, Zhiqiang Ye, Yu X. Xu, Dongsen Geng, Qimin Wang

Wear-resistant oxide coatings play an important role in protecting the surfaces of tools and components. The fabrication of hard oxides using advanced physical vapor deposition techniques has recently attracted considerable attention. In this work, Cr₂O₃ coatings, with a Cr transition layer, were deposited by high-power impulse magnetron sputtering at different pulse widths, and their structure, thermal stability, and tribological properties were investigated. All Cr₂O₃ coatings demonstrate columnar grain growth with a thermodynamically stable hexagonal structure. A pulse width of 70 μs at a constant frequency of 500 Hz yields a peak current of 500 A, resulting in a hardness of 27.2 GPa, which is superior to that achieved at 100 and 280 μs. Decreasing the pulse width to 35 μs at 1500 Hz gives rise to a maximum hardness of 29.3 GPa. The hardness of Cr₂O₃ coatingsincreases upon annealing in air at 800 and 900 °C. Notable grain coarsening, along with increased porosity, leads to a decrease in hardness at 1000 and 1100 °C. The hardness at 1100 °C decreased by 3.5 to 4.7 GPa compared to that at 900 °C. The friction coefficients of the examined Cr₂O₃ range from 0.32 to 0.36 at ambient temperature and diminish to 0.26 to 0.28 at 600 °C. At ambient temperature, Cr₂O₃ coatings, including that deposited at a high pulse width of 280 μs, show outstanding wear resistance, with the specific wear rate below 2 × 10⁻⁷ mm³/N∙m. Nonetheless, certain coatings exhibit severe localized wear at 600 °C, with cracking inside wear tracks. This reduced wear resistance is likely attributable to the inherent brittleness of Cr₂O₃ and the inconsistency in deformation with the underlying Cr.

耐磨氧化物涂层在保护工具和部件表面方面起着重要作用。近年来，利用先进的物理气相沉积技术制备硬质氧化物引起了人们的广泛关注。采用高功率脉冲磁控溅射技术，在不同脉冲宽度下制备了Cr过渡层的Cr2O3涂层，并对其结构、热稳定性和摩擦学性能进行了研究。所有Cr2O3涂层均表现为柱状晶粒生长，具有热力学稳定的六边形结构。当脉冲宽度为70 μs，频率为500 Hz时，峰值电流为500 A，硬度为27.2 GPa，优于100 μs和280 μs时的硬度。在1500 Hz下，将脉冲宽度减小到35 μs，最大硬度为29.3 GPa。在800和900℃的空气中退火后，Cr2O3涂层的硬度增加。在1000℃和1100℃时，晶粒明显变粗，孔隙率增加，导致硬度下降。与900℃时相比，1100℃时的硬度降低了3.5 ~ 4.7 GPa。Cr2O3的摩擦系数在常温下为0.32 ~ 0.36，在600℃时为0.26 ~ 0.28。室温下，Cr2O3涂层表现出优异的耐磨性，比磨损率低于2 × 10−7 mm3/N∙m。然而，某些涂层在600°C时表现出严重的局部磨损，并在磨损轨迹内出现裂纹。这种降低的耐磨性可能是由于Cr2O3的固有脆性和变形与底层Cr的不一致。

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引用次数: 0

Microstructural characterisation of multi-pass Stellite-6 hardfacings developed by pulsed GMAW technique 脉冲GMAW技术制备的Stellite-6多道次堆焊的显微组织特征

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2026-01-14 DOI: 10.1016/j.surfcoat.2026.133178

Md Sharique Ansari , Murugaiyan Amirthalingam , Gautam Agarwal

Stellite 6 is deposited mainly by laser cladding and plasma transferred arc welding. However, these processes have limitations in terms of initial setup cost, process complexity and portability. Pulsed GMAW offers a cost-effective alternative to conventional methods but remains unexplored. In this study, three hardfacings with dimensions 60

\times

60 mm² were deposited over AISI 304 substrate with varying deposition rates while maintaining a constant arc energy per unit length. Defects such as cracking, porosity and lack of fusion were not observed. In-depth characterisations were carried out using different techniques. The deposits showed similar microstructural features where the primary dendrites consisted of a solid-solution matrix of Co and Fe, and the inter-dendritic region consisted of chromium-rich carbides and Co-rich solid solution. Two different morphologies of the carbides were observed: one forming as lamellar, and the other as facetted particles in the vicinity of the lamellar carbides, resembling a rosette structure. Transmission electron microscopy revealed both the carbides to be Cr₇C₃, formed due to the eutectic reaction. The deposits showed hardness in the range of 400–450 HV_0.2, comparable to the existing processes requiring high arc energy. The hardfacing resulted in enhanced wear performance compared to bare substrate. These insights highlight the potential of pulsed GMAW as an alternative to conventional processes and for repairing purposes, where portability and mobility are essential.

钨铬钴合金6的沉积主要采用激光熔覆和等离子转移弧焊两种方法。然而，这些流程在初始设置成本、流程复杂性和可移植性方面存在局限性。脉冲GMAW提供了一种具有成本效益的替代方法，但仍未被探索。在本研究中，在保持单位长度电弧能量恒定的情况下，以不同的沉积速率在AISI 304衬底上沉积了三种尺寸为60 × 60 mm2的硬表面。未观察到裂纹、气孔和熔合不足等缺陷。使用不同的技术进行了深入的特征描述。两者的显微组织特征相似，初生枝晶由Co和Fe固溶体组成，枝晶间由富铬碳化物和富Co固溶体组成。观察到两种不同形态的碳化物：一种是片状碳化物，另一种是片状碳化物附近的面状颗粒，类似于玫瑰花结结构。透射电镜显示两种碳化物均为Cr7C3，是由共晶反应形成的。镀层的硬度在400-450 HV0.2之间，与现有需要高电弧能量的工艺相当。与裸基板相比，堆焊提高了耐磨性能。这些见解突出了脉冲GMAW作为传统工艺和修复目的的替代方案的潜力，其中便携性和移动性是必不可少的。

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引用次数: 0

One-step electrodeposition of Fe-doped CoS₂ nanosheets for efficient hydrogen evolution 一步电沉积fe掺杂co₂纳米片的高效析氢

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2026-01-14 DOI: 10.1016/j.surfcoat.2026.133199

Mohammad A. Alebrahim , A.B. Migdadi , Ahmad A. Ahmad , Qais M. Al-Bataineh

One-step electrochemical tuning of transition-metal chalcogenides offers a versatile route for engineering catalysts at the solid-state level. In this study, we report the direct electrodeposition of Fe-doped CoS₂ thin films on ITO substrates and examine the structural, morphological, electrical, and optical modifications induced by Fe incorporation. Rietveld-refined X-ray diffraction confirms that both pristine and Fe-doped films crystallize in the cubic pyrite structure (space group Pa–3), with Fe incorporation associated with a measurable lattice expansion (a = 5.46 → 5.51 Å). This structural change is consistent with Fe incorporation into the CoS₂ lattice and the induction of lattice strain. SEM and AFM analyses reveal that Fe doping transforms the surface from coarse aggregates into interconnected nanosheet-like domains with reduced roughness, a morphology favorable for improved electronic connectivity. Correspondingly, four-point probe mapping shows that Fe incorporation nearly doubles the electrical conductivity and enhances its spatial uniformity across the film. Optical analysis indicates a slight redshift and a narrowing of the band gap (2.40 → 2.29 eV), suggesting modification of the electronic structure. Electrochemical evaluation shows that Fe-CoS₂ films require a lower overpotential and exhibit faster HER kinetics than undoped CoS₂, indicating that the observed structural and morphological modifications are correlated with improved catalytic behavior. These results provide fundamental insight into how Fe incorporation modulates the properties of electrodeposited CoS₂, highlighting electrochemical co-deposition as a controlled method for studying dopant effects in transition-metal sulfide coatings.

过渡金属硫族化合物的一步电化学调谐为固体水平的工程催化剂提供了一条通用的途径。在这项研究中，我们报道了在ITO衬底上直接电沉积掺杂铁的CoS₂薄膜，并研究了铁掺杂引起的结构，形态，电学和光学修饰。Rietveld-refined x射线衍射证实，原始和掺铁的薄膜都以立方黄铁矿结构（空间群Pa-3）结晶，铁的掺入与可测量的晶格膨胀相关（a = 5.46→5.51 Å）。这种结构变化与铁掺入CoS₂晶格和晶格应变的诱导一致。SEM和AFM分析表明，Fe掺杂将表面从粗聚集体转变为相互连接的纳米片状结构，粗糙度降低，有利于提高电子连通性。相应地，四点探针映射显示，铁的掺入使电导率几乎增加了一倍，并增强了其在薄膜上的空间均匀性。光学分析表明微红移和带隙缩小（2.40→2.29 eV），表明电子结构发生了改变。电化学评价表明，与未掺杂的co₂相比，fe - co₂膜需要更低的过电位，并表现出更快的HER动力学，这表明所观察到的结构和形态改变与催化行为的改善有关。这些结果为铁的掺入如何调节电沉积CoS₂的性质提供了基本的见解，突出了电化学共沉积作为研究过渡金属硫化物涂层中掺杂效应的受控方法。

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引用次数: 0

Microstructural evolution and thermal corrosion resistance of NiCoCrAlYTa coatings modified via high-frequency nanosecond laser remelting 高频纳秒激光重熔改性NiCoCrAlYTa涂层的组织演变及耐热腐蚀性能

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2026-01-14 DOI: 10.1016/j.surfcoat.2026.133190

Ziming Cheng , Wei Qian , Qianru Jia , Liang Liang , Yinqun Hua , Jie Cai , Jinzhong Lu

The hot-corrosion resistance of bond coats is crucial for the longevity of thermal barrier coating (TBC) systems, and improving this property is vital for enhancing TBC performance in high-temperature environments. In this study, high-repetition-rate nanosecond laser remelting (HRF-NLR) was applied to NiCoCrAlYTa bond coats to modify their surface properties, and the hot-corrosion behavior was evaluated at 900 °C in molten Na₂SO₄/NaCl before and after laser modification. The results demonstrated that HRF-NLR significantly reduced surface roughness, porosity, and cracking, while introducing lattice defects and homogenizing the microstructure. A continuous and dense α-Al₂O₃-based thermally grown oxide (TGO) layer formed more readily, leading to an 85.6% reduction in the hot-corrosion oxidation rate compared to the as-sprayed coating. HRF-NLR effectively enhanced the hot-corrosion resistance of NiCoCrAlYTa bond coats, ultimately improving the durability of TBC systems.

粘结层的耐热腐蚀性能对热障涂层（TBC）系统的使用寿命至关重要，提高该性能对于提高TBC在高温环境中的性能至关重要。本研究采用高重复率纳秒激光重熔（HRF-NLR）技术对NiCoCrAlYTa键合层进行表面改性，并在900°C的Na2SO4/NaCl熔液中对激光改性前后的热腐蚀行为进行了评价。结果表明，HRF-NLR显著降低了表面粗糙度、孔隙率和裂纹，同时引入了晶格缺陷并使微观组织均匀化。α- al2o3基热生长氧化物（TGO）层更易于形成，与喷涂涂层相比，热腐蚀氧化速率降低了85.6%。HRF-NLR有效地增强了NiCoCrAlYTa粘结层的耐热腐蚀能力，最终提高了TBC体系的耐久性。

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引用次数: 0

Retaining crystallinity of as-deposited thermoelectric Fe2VAl-based thin films grown from DCMS and HiPIMS 由DCMS和HiPIMS生长的热电fe2val基薄膜的结晶度

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2026-01-14 DOI: 10.1016/j.surfcoat.2026.133200

L. Enzlberger , B. Schmid , L. Mitterhuber-Gressl , T. Wojcik , S. Kolozsvári , P.H. Mayrhofer

Thermoelectric materials have gained much attention in recent years due to their ability to directly interconvert electrical and thermal energy via the Seebeck/Peltier effect. Their appeal for application in energy harvesting and solid-state cooling is however currently held back, as current state-of-the-art systems rely on rare and/or hazardous elements. Efforts to replace them with more abundant and environmentally benign alternatives have shown Heusler-alloys to be attractive candidates with thin film Fe₂V_0.8W_0.2Al achieving a massive Figure of Merit, but requiring extensive post-processing to achieve crystallinity.

Here, we report the direct deposition of this material in a crystalline, fully disordered W-type body-centered cubic (bcc) structure using direct current magnetron sputtering (DCMS) and high-power impulse magnetron sputtering (HiPIMS). Structural analyses confirm the formation of crystalline Heusler Phases in the as-deposited state, even at room temperature, eliminating the need for prolonged annealing. Transport measurements reveal low thermal conductivity (2.12 W/m∙K), low resistivity (≈240 μΩ∙cm) and a moderate Seebeck-coefficient (−55 μV/K), resulting in a viable Figure of Merit (ZT ≈ 0.1). These findings demonstrate an energy-efficient route in the fabrication of thermoelectric thin films from earth-abundant, non-toxic elements to be used for sustainable energy conversion.

近年来，热电材料由于其通过塞贝克/珀尔帖效应直接转换电能和热能的能力而受到了广泛的关注。然而，它们在能量收集和固态冷却方面的应用吸引力目前受到阻碍，因为目前最先进的系统依赖于稀有和/或危险元素。用更丰富、更环保的替代品取代它们的努力表明，heusler合金是有吸引力的候选国，薄膜Fe2V0.8W0.2Al获得了大量的优异值，但需要大量的后处理才能实现结晶度。在这里，我们报道了使用直流磁控溅射（DCMS）和大功率脉冲磁控溅射（HiPIMS）直接沉积这种材料在晶体中，完全无序的w型体心立方（bcc）结构。结构分析证实，即使在室温下，在沉积状态下也能形成结晶的Heusler相，从而消除了长时间退火的需要。输运测量结果显示，该材料导热系数低（2.12 W/m∙K），电阻率低（≈240 μΩ∙cm）， seebeck系数适中（- 55 μV/K），具有可行的优值图（ZT≈0.1）。这些发现证明了利用地球上丰富的无毒元素制造热电薄膜的节能途径，可用于可持续的能量转换。

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引用次数: 0

Designing artificial zinc phosphate tribofilms with tailored mechanical properties by altering the chain length 通过改变链长设计具有定制机械性能的磷酸锌人造摩擦膜

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2026-01-14 DOI: 10.1016/j.surfcoat.2026.133181

Sebastian Lellig , Subisha Balakumar , Peter Schweizer , Eva B. Mayer , Simon Evertz , Marcus Hans , Damian M. Holzapfel , Yin Du , Qing Zhou , Martin Dienwiebel , Johann Michler , Jochen M. Schneider

Zinc dialkyldithiophosphate (ZDDP), as the most prominent lubrication additive, forms tribofilms consisting primarily of zinc phosphate glasses containing sulfides. As sulfur is linked to environmental concerns, sulfur-free zinc phosphate coatings have been sputtered from a Zn₃(PO₄)₂ target and investigated here.

Based on the bridging to non-bridging oxygen ratio, determined by X-ray photoelectron spectroscopy (XPS), the as deposited coatings are classified as metaphosphates. As the annealing temperature is increased, the chain lengths are reduced, as witnessed by XPS data indicated by a loss of phosphorus and oxygen of the coating surface, likely due to hydrolysis with water from the atmosphere.

Transmission electron microscopy energy-dispersive X-ray spectroscopy line scans show that the XPS-revealed composition change of the coating surface upon annealing occurs over the whole thickness of the coating. This alteration in composition and chain length reductions causes a rise in hardness, reduced Young's modulus, and wear resistance. Therefore, the properties of the artificial zinc phosphate tribofilms can be tailored via a thermally stimulated composition change, causing an alternation in chain length from meta- to orthophosphate and thereby enabling the design of coatings with desired mechanical properties.

二烷基二硫代磷酸锌（ZDDP）作为最突出的润滑添加剂，形成主要由含硫化物的磷酸锌玻璃组成的摩擦膜。由于硫与环境问题有关，从Zn3(PO4)2靶材溅射无硫磷酸锌涂层并进行了研究。根据x射线光电子能谱（XPS）测定的桥氧与非桥氧比，将沉积的涂层分类为偏磷酸盐。随着退火温度的升高，链长减少，正如XPS数据所表明的，涂层表面的磷和氧的损失，可能是由于与大气中的水水解。透射电镜能量色散x射线能谱线扫描表明，xps显示的涂层表面成分变化发生在涂层的整个厚度上。这种成分的改变和链长的减少导致硬度的上升，杨氏模量的降低和耐磨性。因此，人工磷酸锌摩擦膜的性能可以通过热刺激的成分变化来定制，导致链长从偏磷酸盐到正磷酸盐的交替，从而使涂层的设计具有所需的机械性能。

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引用次数: 0

The effects of shot peening intensity and coverage on the surface properties and fatigue life of AZ31B magnesium alloy 喷丸强化强度和覆盖范围对AZ31B镁合金表面性能和疲劳寿命的影响

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2026-01-14 DOI: 10.1016/j.surfcoat.2026.133191

Erik Calvo-García , Marco González-Longueira , Samuel Infestas-Carazo , Aida Badaoui , Antonio Riveiro , Rafael Comesaña

Magnesium alloys are attractive materials in many sectors such as the automotive or the aerospace due to their impressive strength-to-weight ratio. However, the applications of magnesium alloys in these sectors demand high fatigue strength. Shot peening is widely used to improve the fatigue behaviour of metallic materials, but magnesium alloys are susceptible to overpeening due to their low hardness, which can hinder the improvement of fatigue behaviour. This research work aims to study the effects of fine particle shot peening treatments on the surface properties and fatigue life of a magnesium alloy AZ31B. These shot peening treatments induced twinning and grain refinement at the surface of the alloy, which is beneficial for the mechanical properties. A factorial design was developed in order to analyse the influence of Almen intensity and coverage on the roughness, wettability, hardness, residual stress and fatigue life of the alloy, and regression models were calculated for each response variable. Higher Almen intensities led to higher roughness values and more wettable surfaces, but coverage had no significant effect on these variables. Surface hardness and compressive residual stresses increased when using either high intensities or high coverages. Regression models were calculated and allowed to predict these experimental results with adjusted-R² values higher than 0.90. Moreover, a significant regression model of fatigue life was obtained as a function of Almen intensity and coverage. The use of lower Almen intensities increased the range of coverage values that maximized the fatigue life of the alloy. The optimal shot peening parameters turned out to be an Almen intensity not higher than 0.05 mm A and coverage between 200% and 300%. At such conditions, fatigue life increased by a factor as high as 100 with respect to the non-treated alloy.

镁合金由于其令人印象深刻的强度重量比，在汽车或航空航天等许多领域都是有吸引力的材料。然而，镁合金在这些领域的应用要求高的疲劳强度。喷丸强化被广泛用于改善金属材料的疲劳性能，但镁合金由于其硬度低，容易进行过度强化，从而阻碍了疲劳性能的改善。本研究旨在研究细颗粒喷丸强化处理对AZ31B镁合金表面性能和疲劳寿命的影响。喷丸强化处理使合金表面出现孪晶和晶粒细化，有利于提高合金的力学性能。采用因子设计分析Almen强度和覆盖度对合金粗糙度、润湿性、硬度、残余应力和疲劳寿命的影响，并对各响应变量建立回归模型。Almen强度越高，粗糙度值越高，地表可湿性越好，而覆盖度对这些变量的影响不显著。当使用高强度或高覆盖率时，表面硬度和压缩残余应力增加。计算回归模型并允许对这些实验结果进行预测，调整后的r2值大于0.90。建立了疲劳寿命随Almen强度和覆盖度的显著回归模型。使用较低的Almen强度增加了覆盖值的范围，使合金的疲劳寿命最大化。最佳喷丸强化参数为Almen强度不高于0.05 mm A，喷丸覆盖率在200% ~ 300%之间。在这种条件下，与未处理的合金相比，疲劳寿命增加了高达100倍。

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引用次数: 0