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A Strategy for Simultaneous Increasement in the Strength-Ductility Balance of Directly-Quenched Ultra-High Strength Low Alloy Steel 同时提高直接淬火超高强度低合金钢强度-延展性平衡的策略
IF 3.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-09-06 DOI: 10.1007/s12540-024-01794-7
Jung-Hyun Park, Min-Seok Baek, Young-Kyun Kim, Jin-Hee Ham, Kee-Ahn Lee

This study investigated a strategy for simultaneous improving in the strength and ductility of the directly quenched ultra-high strength low alloy steel via low-temperature tempering. To stabilize the microstructure, sub-zero treatment was also employed at -73 °C for 30 min, and then tempering was performed for two types of temperature at 200 °C and 630 °C for 30 min. The microstructure of as-quenched steel consists of lath martensite and meta-stable retained austenite. After low temperature tempering (200 °C), some stable reverted austenite was formed at the austenite/martensite interface. When tempering was performed at high temperature (630 °C), the entire austenite remained as reverted austenite. In addition, Ti-rich carbides were observed at the martensite lath boundaries during tempering treatment. Tensile strength increased up to ∼ 1.8 GPa after low-temperature tempering, and ductility was also higher than that of as-quenched steel. In contrast, the steel which was tempered at 630 °C shows low mechanical properties compared to the as-quenched steel. Correlations between microstructure evolution (meta-stable to stable austenite transformation), mechanical properties and deformation behavior were also discussed and identified.

Graphical Abstract

本研究探讨了通过低温回火同时提高直接淬火超高强度低合金钢强度和延展性的策略。为了稳定显微组织,还采用了-73 ℃深冷处理 30 分钟,然后在 200 ℃和 630 ℃两种温度下回火 30 分钟。淬火钢的微观结构由板条马氏体和元稳定残余奥氏体组成。低温回火(200 °C)后,奥氏体/马氏体界面上形成了一些稳定的回复奥氏体。在高温(630 °C)回火时,整个奥氏体仍为还原奥氏体。此外,在回火处理过程中,在马氏体板条边界还观察到了富钛碳化物。低温回火后,抗拉强度提高至 1.8 GPa,延展性也高于淬火钢。相反,与淬火钢相比,630 ℃回火钢的机械性能较低。此外,还讨论并确定了显微组织演变(元稳定奥氏体向稳定奥氏体转变)、机械性能和变形行为之间的相关性。
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引用次数: 0
Effect of Microstructural Changes by Friction Stir Processing on the Clad-to-Core Interfacial Strength of Thin Aluminum-Clad Aluminum Sheets 摩擦搅拌加工的微观结构变化对薄铝板包层与芯材界面强度的影响
IF 3.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-08-31 DOI: 10.1007/s12540-024-01776-9
Kun Gao, Guiqi Liu, Sung-Tae Hong, Soumyabrata Basak

The present study successfully utilizes friction stir processing (FSP) as a surface engineering tool on an AA4343-clad AA3003 sheet to improve the interfacial strength through microstructural homogenization. Compared to the base material condition, electron back-scattered diffraction analysis after FSP reveals a considerable reduction in grain morphological disparity between the clad layer and the core due to the occurrence of grain refinement by continuous dynamic recrystallization. Scanning electron microscopy (SEM) analysis reveals various Si-induced precipitations, including Al (Mn, Fe) Si, within the stir zone due to the diffusion of Si from the clad layer to the core during FSP. The influence of microstructural changes on improving the mechanical properties of the bi-layer clad sheet is also examined. The surface microhardness values of the clad (~ 28.7 Hv) and core (~ 35.5 Hv) for the base material condition are found to be improved to ~ 34.7 Hv and 38.5 Hv, respectively, after FSP. Besides, the overall strength of the FSPed clad sheet increases by ~ 45% compared to the base material conditions. The microstructural homogenization and Si-induced precipitates act together to strengthen the interface in the clad material system. SEM images on the fractured surfaces of the tensile specimens reveal delamination between the AA4343 (clad layer) and AA3003 (core) for the base material condition, which disappears after FSP.

Graphical Abstract

本研究成功地在 AA4343 覆层 AA3003 板材上利用摩擦搅拌加工(FSP)作为一种表面工程工具,通过微观结构均匀化来提高界面强度。与基体材料相比,FSP 后的电子反向散射衍射分析表明,由于连续动态再结晶产生了晶粒细化,包覆层与芯材之间的晶粒形态差异显著减小。扫描电子显微镜(SEM)分析表明,由于在快熔固化过程中硅从包覆层向芯部扩散,在搅拌区内出现了各种由硅引起的析出物,包括铝(锰、铁)硅。此外,还研究了微结构变化对改善双层覆层板机械性能的影响。结果发现,在 FSP 之后,基材条件下的覆层表面显微硬度值(~ 28.7 Hv)和芯材表面显微硬度值(~ 35.5 Hv)分别提高到了~ 34.7 Hv 和 38.5 Hv。此外,与基本材料条件相比,经过 FSP 处理的覆层板的整体强度提高了约 45%。微结构均质化和矽诱导析出物共同作用,强化了覆层材料体系的界面。拉伸试样断裂表面的扫描电子显微镜图像显示,在基体材料条件下,AA4343(覆层)和 AA3003(芯材)之间存在分层,而在 FSP 之后,分层现象消失了。
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引用次数: 0
Correlation Between Microstructural Features and Corrosion Resistance in a Fine-Grained Severely Deformed Biodegradable Mg‒4Zn Alloy 细粒度严重变形可生物降解镁-4Zn 合金的微观结构特征与耐腐蚀性之间的相关性
IF 3.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-08-30 DOI: 10.1007/s12540-024-01789-4
M. Sabbaghian, R. Mahmudi, K. S. Shin

The corrosion resistance of a biodegradable Mg‒4Zn alloy, severely deformed by equal channel angular pressing (ECAP) and simple shear extrusion (SSE), was investigated and formulated in terms of different microstructural features. The grain size of the extruded alloy decreased after ECAP and SSE. The finest grain size of 3.6 μm was obtained after 4 SSE passes. Second phase particles were refined and distributed more uniformly in the SSE-processed conditions. Electron back-scattered diffraction examinations revealed that 4 ECAP passes transforms the fiber texture of the extruded material to a shear-type texture component. However, a semi-fiber component, with the (0001) planes parallel to the pressing direction, was observed in SSE-processed samples. The corrosion resistance, analyzed via electrochemical testing in a phosphate buffered saline (PBS), was improved by ECAP and SSE processing. Despite the larger grain size of the ECAP-processed conditions, they showed higher corrosion resistances (Rp) than those of the SSE-processed ones. This was attributed to the higher density of basal planes at the surface, vaster dynamically recrystallized regions, larger high-angle grain boundary fractions, lower second phase volume fractions, and more homogeneous grain structures. These microstructural features were quantified and incorporated into a model to formulate the corrosion resistance of the alloy.

Graphical Abstract

研究了一种可生物降解的 Mg-4Zn 合金的耐腐蚀性,该合金通过等通道角压(ECAP)和简单剪切挤压(SSE)发生严重变形,并根据不同的微观结构特征对其进行了表述。经过 ECAP 和 SSE 挤压后,挤压合金的晶粒尺寸减小。经过 4 次 SSE 挤压后,获得的最细粒度为 3.6 μm。在 SSE 加工条件下,第二相颗粒更加细化,分布更加均匀。电子反向散射衍射检查显示,通过 4 次 ECAP 可将挤压材料的纤维纹理转变为剪切型纹理成分。然而,在 SSE 加工的样品中观察到了半纤维成分,其 (0001) 平面与挤压方向平行。通过在磷酸盐缓冲盐水(PBS)中进行电化学测试分析,ECAP 和 SSE 加工可提高耐腐蚀性。尽管 ECAP 加工条件下的晶粒尺寸较大,但其耐腐蚀性(Rp)却高于 SSE 加工条件下的样品。这归因于表面基底面密度更高、动态再结晶区域更广、高角度晶界分数更大、第二相体积分数更低以及晶粒结构更均匀。对这些微观结构特征进行了量化,并将其纳入合金耐腐蚀性模型。
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引用次数: 0
Effects of Different Microstructure on Strengthening Mechanism and Hardening Mechanism in Peak-Aged Mg–14Gd–0.2Sn Alloy 不同显微组织对峰值时效 Mg-14Gd-0.2Sn 合金强化机制和硬化机制的影响
IF 3.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-08-30 DOI: 10.1007/s12540-024-01792-9
Boshu Liu, Kaiqiang Cao, Rongguang Li, Yuehong Zhang, Hang Zhang, Shanshan Li, Sha Sha

A bimodal-grained microstructure is formed in the Mg–14Gd–0.2Sn alloy extruded with a small extrusion ratio of 7 (E7 alloy), containing a large number of fine dynamic recrystallized (DRXed) grains with an average size of ~ 1.11 μm. In comparison, a much higher proportion of DRXed microstructure (~ 90%) with a coarser grain size of ~ 5.85 μm is formed in the alloy extruded with a large ratio of 16 (E16 alloy). The lower actual temperature during extrusion of the E7 alloy increases the supersaturation degree of α-Mg solid solution matrix, and induces a higher volume fraction of dynamic precipitates (β-Mg5Gd) compared with the E16 alloy. After aging, the E7-A alloy exhibits a stronger precipitation strengthening effect with a peak-aged yield strength (YS) of 405 MPa. The YS of the E7-A alloy presents a remarkable improvement of 88 MPa compared with that of the E16-A alloy, which is mainly related to finer DRXed grains and stronger texture. In contrast, the hardness increment of the E16-A alloy is higher than that of the E7-A alloy, and the peak hardness of the E16-A alloy is comparable to that of the E7-A alloy. Although the high density of precipitates in the E16-A alloy contributes to a strong aging hardening response, the weaker precipitation strengthening effect of the E16-A alloy is mainly attributed to the activation of twinning in coarser grains with a weaker texture.

Graphical Abstract

在挤压比为 7 的小挤压比 Mg-14Gd-0.2Sn 合金(E7 合金)中形成了双峰微观结构,其中包含大量平均尺寸约为 1.11 μm 的细小动态再结晶(DRXed)晶粒。相比之下,在大比例为 16 的挤压合金(E16 合金)中,形成的 DRX 化微观结构比例要高得多(约 90%),晶粒尺寸较粗,约为 5.85 μm。与 E16 合金相比,E7 合金挤压过程中较低的实际温度增加了 α-Mg 固溶体基体的过饱和程度,并诱发了较高体积分数的动态沉淀物(β-Mg5Gd)。时效后,E7-A 合金表现出更强的沉淀强化效果,其时效屈服强度(YS)峰值为 405 兆帕。与 E16-A 合金相比,E7-A 合金的屈服强度显著提高了 88 兆帕,这主要与更细的 DRX 化晶粒和更强的质地有关。相比之下,E16-A 合金的硬度增量高于 E7-A 合金,且 E16-A 合金的峰值硬度与 E7-A 合金相当。虽然 E16-A 合金中高密度的析出物有助于产生较强的时效硬化响应,但 E16-A 合金较弱的析出强化效果主要是由于较粗晶粒中孪晶的活化和较弱的质地造成的。
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引用次数: 0
Improving High-Temperature Wear Resistance of Ti–6Al–4V alloy via Si–B–Y Co-Deposited Coatings 通过 Si-B-Y 共沉积涂层提高 Ti-6Al-4V 合金的高温耐磨性
IF 3.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-08-30 DOI: 10.1007/s12540-024-01787-6
Xuan Li, Xu-yi Zhang, Zhi-zhang Liu, Li-jing Zhang, Lei Luo, Sheng Lai

Si-deposited and Si–B–Y co-deposited coatings were prepared on the Ti–6Al–4V alloy using the pack cementation technique. The microstructures of the coatings, as well as their high-temperature wear performance and mechanisms, were comparatively investigated. The results illustrated that the Si–B–Y co-deposited coating had a similar structure with the Si-deposited coating, both of them possessed three-layer structures: an outer layer of TiSi2 matrix, a middle layer of TiSi, and an inner layer of Ti5Si4 and Ti5Si3 mixtures. However, numerous TiB2 and Y2O3 phases formed in the superficial zones of the Si–B–Y co-deposited coating. The micro-hardness of the Si-deposited and Si–B–Y co-deposited coatings was significantly higher than that of the Ti–6Al–4V substrate, and displayed a gradual decrease tendency from the coating surface to the interior. Compared to the Si-deposited coating, the Si–B–Y co-deposited coating possessed a more compact structure and higher surface hardness, and offered better anti-wear performance for the Ti–6Al–4V substrate at 600 ℃. Worn against the GCr15 ball, the average friction coefficient of the Si–B–Y co-deposited coating (~ 0.449) were near equal to that of the Si-deposited coating (~ 0.474), but lower than that of the Ti–6Al–4V substrate (~ 0.685). The wear rate of the Si–B–Y co-deposited coating was approximately 4.1 × 10⁻5 mm3/N·m, lower than that of the Ti–6Al–4V substrate by about 74.6%, and the Si-deposited coating by about 37.3%, respectively. When worn against the Al2O3 ball, the average friction coefficient of the Si–B–Y co-deposited coating (~ 0.742) was lower than that of the Si-deposited coating (~ 0.811), but higher than that of the Ti–6Al–4V substrate (~ 0.551). The wear rate of the coating was approximately 1.22 × 10−4 mm3/N·m, lower than that of the Ti–6Al–4V substrate by about 72.2%, and the Si-deposited coating by about 35%.

Graphical Abstract

采用包胶结技术在 Ti-6Al-4V 合金上制备了硅沉积涂层和硅-B-Y 共沉积涂层。比较研究了涂层的微观结构及其高温磨损性能和机理。结果表明,Si-B-Y 共沉积涂层与 Si- 沉积涂层的结构相似,都具有三层结构:外层为 TiSi2 基体,中间层为 TiSi,内层为 Ti5Si4 和 Ti5Si3 混合物。然而,在 Si-B-Y 共沉积涂层的表层区域形成了大量 TiB2 和 Y2O3 相。Si沉积涂层和Si-B-Y共沉积涂层的微硬度明显高于Ti-6Al-4V基体,并呈现出从涂层表面向内部逐渐降低的趋势。与 Si- 沉积涂层相比,Si-B-Y 共沉积涂层具有更紧凑的结构和更高的表面硬度,在 600 ℃ 下对 Ti-6Al-4V 基体具有更好的抗磨损性能。与 GCr15 球磨损时,Si-B-Y 共沉积涂层的平均摩擦系数(约 0.449)与 Si- 沉积涂层的平均摩擦系数(约 0.474)接近,但低于 Ti-6Al-4V 基材的平均摩擦系数(约 0.685)。Si-B-Y 共沉积涂层的磨损率约为 4.1 × 10-5 mm3/N-m,分别比 Ti-6Al-4V 基材的磨损率低约 74.6% 和 Si- 沉积涂层的磨损率低约 37.3%。与 Al2O3 球磨损时,Si-B-Y 共沉积涂层的平均摩擦系数(约 0.742)低于 Si- 沉积涂层(约 0.811),但高于 Ti-6Al-4V 基体(约 0.551)。涂层的磨损率约为 1.22 × 10-4 mm3/N-m,比 Ti-6Al-4V 基材的磨损率低约 72.2%,比 Si- 沉积涂层的磨损率低约 35%。
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引用次数: 0
Formation of Microstructure and Mechanical Properties of Co-Cr-Mo Alloy by Hot Forging and Subsequent Radial Shear Rolling 通过热锻和随后的径向剪切轧制形成 Co-Cr-Mo 合金的显微组织和力学性能
IF 3.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-08-26 DOI: 10.1007/s12540-024-01791-w
Yury Gamin, Tatiana Kin, Sergei Galkin, Alexander Skugorev, Mukhamed Karashaev, Abdullah Mahmoud Alhaj Ali

The improving of metallic biomaterials, such as Co-Cr-Mo alloys, is an important task for increasing the durability of orthopedic implants. In this study, the deformation method of the Co-28Cr-6Mo alloy including hot forging and subsequent radial shear rolling was tested for the first time. For the obtained bars, the analysis of the microstructure formation and mechanical properties was carried out. The proposed method of thermomechanical processing made possible to form a duplex structure (γ-FCC + ε-HCP) in the alloy, in contrast to the hot forging at which a single-phase structure (ε-HCP) was observed. The resulting structure provided higher strength characteristics at the bar surface such as YS ∼ 715 MPa, UTS ∼ 1164 MPa due to the higher content of the ε-phase, while in the central zone these indicators were YS ∼ 492 MPa and UTS ∼ 948 MPa. The main effect of hardening after forging was grain refinement and formation of a single-phase composition (ε-HCP). While in the context of radial shear rolling, there was a reduction in grain size and an increase in the volume fraction of the deformed structure. Moreover, the plasticity almost did not change over the cross-section of the bar due to combination of structural and phase composition obtained after radial shear rolling. The results can provide the basis for development of industrial technology to produce long deformed semi-finished products for medical application.

Graphical Abstract

改进金属生物材料(如 Co-Cr-Mo 合金)是提高骨科植入物耐用性的一项重要任务。本研究首次测试了 Co-28Cr-6Mo 合金的变形方法,包括热锻和随后的径向剪切轧制。对获得的棒材进行了微观结构形成和机械性能分析。与热锻时观察到的单相结构(ε-HCP)相比,所提出的热机械加工方法使合金形成了双相结构(γ-FCC + ε-HCP)。由于ε相含量较高,由此产生的结构在棒材表面提供了更高的强度特性,如 YS ∼ 715 MPa,UTS ∼ 1164 MPa,而在中心区域,这些指标分别为 YS ∼ 492 MPa 和 UTS ∼ 948 MPa。锻造后淬火的主要影响是晶粒细化和形成单相成分(ε-HCP)。而在径向剪切轧制的情况下,晶粒尺寸减小,变形结构的体积分数增加。此外,由于径向剪切轧制后获得的结构和相组成的组合,塑性在棒材横截面上几乎没有变化。这些结果可为开发工业技术提供依据,以生产用于医疗应用的长变形半成品。
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引用次数: 0
Microstructure, Mechanical Properties and Tribological Behavior of Wire Electron Beam Additive Manufactured Eutectic Al–12Si Alloy 线材电子束添加剂制造的共晶 Al-12Si 合金的微观结构、力学性能和摩擦学行为
IF 3.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-08-26 DOI: 10.1007/s12540-024-01785-8
Sergei Tarasov, Ruslan Balokhonov, Veronika Utyaganova, Anna Zykova, Nikolai Savchenko, Andrey Vorontsov, Varvara Romanova, Nikolai Shamarin, Evgeny Knyazhev, Denis Gurianov, Evgeny Moskvichev

Wire electron beam additive manufacturing has been used to build a wall from Al–12Si wire on an AA5056 substrate. The microstructures composed of aluminum dendrites and Al/Si eutectics have been revealed along with heat-affected bands where silicon crystals coarsened by reheating from deposition of the next layer. Fine precipitates were detected in the aluminum grains subjected to reheating. Twinning of silicon particles was found by means of TEM, which was the result of the thermal expansion mismatch stresses that appeared in cooling to the room temperatures as shown by direct FEM numerical simulations. Ultimate tensile strength (UTS) and yield stress (YS) ranged from 178–185 MPa and 104–115 MPa, respectively, as compared to 84 and 142 MPa for the as-cast alloy. Minimal wear was obtained on samples cut from the middle part of the wall. Wire additive manufacturing allowed obtaining the Al–12Si structures with equiaxed eutectic Si crystals that allowed improving tensile and compression strengths as well as wear resistance as compared to those of the as-cast alloy.

Graphical Abstract

利用线电子束增材制造技术,在 AA5056 基材上用 Al-12Si 线制造了一堵墙。由铝枝晶和铝/硅共晶组成的微观结构以及受热影响的带状结构被揭示出来,在这些带状结构中,硅晶体在下一层沉积后重新加热而变粗。在重新加热的铝晶粒中发现了细小的沉淀物。通过 TEM 发现了硅颗粒的孪晶,正如直接有限元数值模拟所示,这是冷却到室温时出现的热膨胀失配应力的结果。极限拉伸强度(UTS)和屈服应力(YS)分别为 178-185 兆帕和 104-115 兆帕,而铸造合金的极限拉伸强度和屈服应力分别为 84 和 142 兆帕。从壁中间部分切割的样品磨损最小。线材添加剂制造技术可获得具有等轴共晶硅晶体的 Al-12Si 结构,与铸造合金相比,可提高拉伸和压缩强度以及耐磨性。
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引用次数: 0
Study About the Forming Mechanism of Boron in Al-1B Alloy 关于 Al-1B 合金中硼的形成机理的研究
IF 3.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-08-24 DOI: 10.1007/s12540-024-01768-9
Jie Liu, Yan Wang, Xiaoli Cui

In order to study the forms of boron in Al-B alloys with lower boron content, and expand the application scope of Al-B alloys with lower boron content. Al-1B alloy was prepared by mechanical alloying and vacuum sintering, the formation and evolution mechanism of boron in Al melt were analyzed in detail. Owing to the high concentration gradient of boron at a certain point in the Al melt, AlB12 is easily formed at first and then peritectic reaction between AlB12 and Al happened forming AlB12@AlB2 composite structure.The AlB12@AlB2 composite structure is easily reserved and keeps stable in Al-1B alloy. During the boronization process, AlB2 reacts with transition metal elements, and AlB12 remains in the Al melt.The study is beneficial for improving the efficiency of boronization treatment.

Graphical Abstract

为了研究低硼含量 Al-B 合金中硼的形态,扩大低硼含量 Al-B 合金的应用范围。通过机械合金化和真空烧结制备了 Al-1B 合金,并详细分析了硼在铝熔体中的形成和演化机理。由于硼在铝熔体中某一点的浓度梯度较高,首先容易形成AlB12,然后AlB12与铝发生包晶反应,形成AlB12@AlB2复合结构,AlB12@AlB2复合结构在Al-1B合金中容易保留并保持稳定。在硼化过程中,AlB2 与过渡金属元素发生反应,AlB12 留在铝熔体中,该研究有利于提高硼化处理的效率。
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引用次数: 0
Effect of Different Types of Glass Powders on the Corrosion and Wear Resistance of Peo Coatings Produced on 6061 Aluminum Alloy 不同类型的玻璃粉对 6061 铝合金 Peo 涂层耐腐蚀性和耐磨性的影响
IF 3.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-08-24 DOI: 10.1007/s12540-024-01786-7
Luca Pezzato, Lorena Kostelac, Lavinia Tonelli, Hamada Elsayed, Daniel Kajánek, Enrico Bernardo, Carla Martini, Manuele Dabalà, Katya Brunelli

6061 Aluminium alloy was treated with plasma electrolytic oxidation (PEO) in an alkaline silicate-base electrolyte. Recycled glass particles from consumer goods waste were added to the electrolyte in order to investigate the impact of these particles on corrosion and wear resistance of the alloy. A comparison of glass particles from different sources (liquid crystal display (LCD) glass, borosilicate (BS) glass, and soda-lime (SL) glass) has been made. Also, the effect of different current modes, direct (D) and pulsed (P), on glass incorporation and the coatings morphology was studied. The microstructure and thickness of the produced coatings were studied through SEM–EDS analysis and XRD. The wear resistance was evaluated by dry sliding tests vs AISI 52100 bearing steel (block-on-ring contact geometry). The corrosion behavior was analyzed by potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS), and localized electrochemical characteristics were determined by scanning electrochemical microscopy (SECM). The results evidenced that the addition of glass improved the corrosion resistance of the samples due to the sealing effect on the typical pores of the PEO layer. In detail samples filled with glass particles show from EIS tests polarization resistances up to one order of magnitude higher than the untreated sample in the case of direct current mode and up to two order of magnitude higher in the case of pulsed current mode. The effect on wear resistance is instead strictly related to the type of glass as, if compared to the base PEO layer, it is improved only by selected additives with the more promising results obtained with the LCD glass in direct current mode that produce a decrease of the wear depth of around one order of magnitude in comparison with the sample PEO treated without glass addition. Globally the more promising type of glass particles, both in term of improvement of the wear and of the corrosion properties, seem to be the LCD glass particles. This fact was related to the particular chemical composition of this type of glass and in particular with the alkali-free composition of the glass.

Graphical Abstract

在碱性硅酸盐基电解液中对 6061 铝合金进行了等离子电解氧化(PEO)处理。在电解液中加入了从消费品废料中回收的玻璃微粒,以研究这些微粒对合金耐腐蚀性和耐磨性的影响。对不同来源的玻璃颗粒(液晶显示器(LCD)玻璃、硼硅酸盐(BS)玻璃和钠钙玻璃)进行了比较。此外,还研究了不同电流模式(直流(D)和脉冲(P))对玻璃掺入和涂层形态的影响。通过 SEM-EDS 分析和 XRD 研究了所制备涂层的微观结构和厚度。通过对 AISI 52100 轴承钢(环状接触几何形状)进行干滑动测试,评估了耐磨性。通过电位极化(PDP)和电化学阻抗谱(EIS)分析了腐蚀行为,并通过扫描电化学显微镜(SECM)确定了局部电化学特性。结果表明,由于玻璃对 PEO 层典型孔隙的密封作用,玻璃的加入提高了样品的耐腐蚀性。具体来说,填充了玻璃微粒的样品在 EIS 测试中显示,在直流模式下,极化电阻比未处理的样品高出一个数量级,在脉冲电流模式下则高出两个数量级。对耐磨性的影响与玻璃的类型密切相关,因为如果与基底 PEO 层相比,只有经过选择的添加剂才能改善耐磨性,在直流模式下,LCD 玻璃的效果更佳,与未添加玻璃的 PEO 样品相比,磨损深度降低了约一个数量级。总的来说,LCD 玻璃微粒在改善磨损和腐蚀性能方面似乎更有前途。这与这类玻璃的特殊化学成分有关,特别是与玻璃的无碱成分有关。
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引用次数: 0
Role of Y in High-Strength Mg–Y–Cu–Ni Alloy System with Long-Period Stacking Ordered Phase Y 在具有长周期堆积有序相的高强度 Mg-Y-Cu-Ni 合金体系中的作用
IF 3.3 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-08-24 DOI: 10.1007/s12540-024-01793-8
Meng Li, Jonghyun Kim, Zhaobin Zhang, Gao Yu, Bin Jiang, Taekyung Lee, Fusheng Pan

This study has systematically investigated the effect of Y content on the microstructural evolution and mechanical properties of the Mg–Y–Cu–Ni alloy system. Four alloys, Mg(98−x)YxCu1Ni1 (x = 1, 2, 3, and 4 at.%), were fabricated and compared in various aspects for this purpose. Increasing Y content gave rise to an increasing fraction of long-period stacking ordered (LPSO) phases, and gradually changed their morphology from massive islands to lamellae. The alloying addition also induced an effective grain refinement, while inhibiting the dynamic recrystallization. When the Y content exceeded 3 at.%, a unique phase formed due to a mechanical mixture of the LPSO phase, the peritectic reaction product of Cu, and the eutectic reaction product of Ni. The mechanical properties were explained in light of the LPSO dispersion parameter. The extruded Mg95Y3Cu1Ni1 alloy exhibited excellent mechanical properties combining a yield strength of 381 MPa, tensile strength of 458 MPa, and elongation-to-failure of 6.7%.

Graphical Abstract

本研究系统地探讨了 Y 含量对 Mg-Y-Cu-Ni 合金体系的微观结构演变和机械性能的影响。为此,我们制造了四种合金 Mg(98-x)YxCu1Ni1(x = 1、2、3 和 4%),并对其进行了多方面的比较。随着 Y 含量的增加,长周期堆积有序相(LPSO)的比例也在增加,其形态也逐渐从块状岛状转变为片状。合金添加还能有效地细化晶粒,同时抑制动态再结晶。当 Y 含量超过 3%时,由于 LPSO 相、Cu 的包晶反应产物和 Ni 的共晶反应产物的机械混合,形成了一种独特的相。根据 LPSO 分散参数解释了其机械性能。挤压成型的 Mg95Y3Cu1Ni1 合金具有优异的机械性能,屈服强度为 381 兆帕、抗拉强度为 458 兆帕、断裂伸长率为 6.7%。
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引用次数: 0
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Metals and Materials International
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