Journal of Magnesium and Alloys最新文献_第9页

Enhanced corrosion resistance, antibacterial properties and osteogenesis by Cu ion optimized MgAl-layered double hydroxide on Mg alloy 镁合金上的铜离子优化镁铝层双氢氧化物可增强耐腐蚀性、抗菌性和成骨性

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2024-10-01 DOI: 10.1016/j.jma.2023.08.010

Qingge Wang , Chuting Liao , Bo Liu , Shaohui Jing , Zhenhu Guo , Luxin Liang , Jingbo Liu , Ning Li , Runhua Zhou , Ian Baker , Hong Wu

Magnesium (Mg) and its alloys have similar densities and elastic moduli to natural bone, making them an excellent choice for orthopedic implants. However, Mg alloys are prone to electrochemical corrosion, which often leads to implant failure and hinders the further development of Mg alloys due to bacterial infection around the implant. This work aims to enhance the corrosion resistance of Mg alloys, and provide theoretical guidance for solving the problem that Mg-based orthopedic implants are susceptible to bacterial infection and, thus, implant failure. In order to solve the corrosion problem, the Mg alloy AZ91D was used as the substrate, and a compact and uniform MgAlCu-layered double hydroxide (Mg(Cu)-LDH) was prepared on its surface using a hydrothermal method. The Mg(Cu)-LDH provides a barrier between the AZ91D and corrosive liquid, which effectively protects the Mg substrate from being corroded. The Mg(Cu)-LDH shows great cell viability for MC3T3-E1 cells. The Cu²⁺ and Mg²⁺ in the coating also endow the Mg(Cu)-LDH/AZ91D with antibacterial properties, showing strong antibacterial effects on both E. coli and S. aureus with antibacterial rates over 85%. Finally, in vivo results indicated that a LDH-coated implant had no systemic effects on the hearts, livers, spleens, lungs or kidneys. It was shown that 4 weeks after surgery the ratio of bone volume to tissue volume (BV/TV) of the LDH implant was 24%, which was 1.7 times that observed for AZ91D.

镁（Mg）及其合金具有与天然骨骼相似的密度和弹性模量，因此是骨科植入物的绝佳选择。然而，镁合金容易受到电化学腐蚀，这往往会导致植入物失效，并因植入物周围的细菌感染而阻碍镁合金的进一步发展。本研究旨在提高镁合金的耐腐蚀性，为解决镁基骨科植入物易受细菌感染从而导致植入物失效的问题提供理论指导。为了解决腐蚀问题，本文以镁合金 AZ91D 为基体，采用水热法在其表面制备了致密均匀的 MgAlCu 层状双氢氧化物（Mg(Cu)-LDH）。Mg(Cu)-LDH 在 AZ91D 和腐蚀性液体之间形成了一道屏障，从而有效地保护了镁基底免受腐蚀。Mg(Cu)-LDH 对 MC3T3-E1 细胞具有很高的存活率。涂层中的 Cu2+ 和 Mg2+ 还赋予了 Mg（Cu）-LDH/AZ91D 抗菌特性，对大肠杆菌和金黄色葡萄球菌都有很强的抗菌效果，抗菌率超过 85%。最后，体内研究结果表明，LDH 涂层植入物对心脏、肝脏、脾脏、肺部或肾脏没有系统性影响。结果表明，术后 4 周，LDH 植入体的骨体积与组织体积之比（BV/TV）为 24%，是 AZ91D 的 1.7 倍。

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引用次数: 0

Understanding the basal texture initiation in a randomly-oriented AZ31B alloy during cold-rolling 了解冷轧过程中无规取向 AZ31B 合金基底纹理的形成过程

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2024-10-01 DOI: 10.1016/j.jma.2023.12.005

Wenhan Jin , Baolin Wu , Li Zhang , Jie Wang , Claude Esling , Marie-Jeanne Philippe

This study experimentally investigated basal texture initiation and development during cold rolling, in combination with simulation using a modified visco-plastic self-consistent (VPSC) model. The results showed that the orientation of extension twins exhibit a random distribution after rolling. In contrast, the matrix grains deformed by slips tend to orientate with their c-axis around the normal direction (ND). Plastic strain concentration induced by dislocation piling up at grain boundaries contributes to plastic deformation inhomogeneity, and promotes the basal–pyramidal and prismatic–prismatic binary slips. Incorporated with the interactions between the basal 〈a〉 and pyramidal 〈c + a〉 dislocations, and between the prismatic 〈a〉 dislocations, the VPSC model replicates the experimental results, effectively demonstrating the process of the basal texture initiation and development. The basal texture initiation is independent of twinning, and results mainly from the development of misorientation induced by the formation of dislocation sub-boundaries via the interaction between the basal 〈a〉 and pyramidal 〈c + a〉 dislocations.

本研究结合使用改进的粘塑性自洽（VPSC）模型进行的模拟，对冷轧过程中基底纹理的形成和发展进行了实验研究。结果表明，轧制后延伸孪晶的取向呈现随机分布。与此相反，因滑移而变形的基体晶粒倾向于围绕法线方向（ND）的 c 轴取向。晶粒边界位错堆积引起的塑性应变集中造成了塑性变形的不均匀性，并促进了基体-金字塔和棱柱-棱柱二元滑移。结合基底〈a〉位错与金字塔〈c＋a〉位错之间以及棱柱〈a〉位错之间的相互作用，VPSC模型复制了实验结果，有效地展示了基底纹理的形成和发展过程。基底纹理的形成与孪晶无关，主要是由于基底〈a〉位错与金字塔〈c＋a〉位错之间相互作用形成的位错子边界所引起的错向发展。

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引用次数: 0

Developing an efficient anticorrosive system through advanced modification of plasma-electrolyzed MgO with CeNiLDH complexed with V₂O₅ nanoparticles and (2E)-But-2-enedioic acid 用 V₂O₅ 纳米粒子和 (2E)-But-2-enedioic acid 复合物 CeNiLDH 对等离子电解氧化镁进行高级改性，开发高效防腐系统

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2024-10-01 DOI: 10.1016/j.jma.2024.10.015

Mosab Kaseem , Ananda Repycha Safira , Mohammad Aadil , Talitha Tara Thanaa , Arash Fattah-alhosseini

Advanced hybrid materials with unique properties are essential for addressing the demands of increasingly complex applications. Despite their importance, the self-assembly of layered double hydroxides (LDH) with metallic oxide nanoparticles and dicarboxylic acids is constrained by a limited understanding of the formation mechanisms and difficulties in evaluating their anticorrosive performance. In this study, we developed a novel anticorrosive system by intercalating CeNiLDH with a complex of vanadium pentoxide (V₂O₅) nanoparticles and (2E)‑but-2-enedioic acid ((2E)-BDA) on a MgO layer created through plasma-electrolysis of AZ31 Mg alloy. This system was compared with LDH films intercalated with either V₂O₅ or (2E)-BDA alone. The intercalation of LDH with V₂O₅ and (2E)-BDA resulted in a flower-like structure, while modification with their complex led to a more compact, cloud-like formation. These cloud-like structures, driven by enhanced absorption and robust hydrogen bonding throughout the hierarchical network, effectively suppress corrosion by delaying the movement of corrosive anions. This was reflected in a polarization resistance of 1.51 × 10¹⁰ Ω·cm², which is approximately two orders of magnitude times higher than the resistance of the unmodified LDH film (3.41 × 10⁸ Ω·cm²). Additionally, the corrosion current density (i_corr) of the VOBDA sample showed a decrease by four orders of magnitude compared to the unmodified LDH sample, emphasizing the superior anticorrosive performance of this hybrid coating. Density functional theory (DFT) was used to elucidate the bonding and formation mechanisms between LDH and the inorganic-organic complex.

具有独特性能的先进混合材料对于满足日益复杂的应用需求至关重要。层状双氢氧化物（LDH）与金属氧化物纳米颗粒和二羧酸的自组装尽管非常重要，但由于对其形成机理的了解有限，且难以评估其防腐性能，因此受到限制。在本研究中，我们开发了一种新型防腐体系，将 CeNiLDH 与五氧化二钒（V₂O₅）纳米粒子和 (2E)-2- 丁烯二酸（(2E)-BDA）的复合物插层在 AZ31 镁合金等离子电解生成的氧化镁层上。该系统与仅夹有 V₂O₅ 或 (2E)-BDA 的 LDH 薄膜进行了比较。LDH 与 V₂O₅ 和 (2E)-BDA 的插层形成了花状结构，而与它们的复合物的改性则形成了更紧凑的云状结构。这些云状结构由整个分层网络中增强的吸收和稳固的氢键驱动，通过延迟腐蚀性阴离子的移动有效抑制了腐蚀。这体现在极化电阻为 1.51 × 10¹⁰ Ω-cm²，比未改性 LDH 薄膜的电阻（3.41 × 10⁸ Ω-cm²）高出约两个数量级。此外，与未改性的 LDH 样品相比，VOBDA 样品的腐蚀电流密度（icorr）降低了四个数量级，凸显了这种混合涂层卓越的防腐性能。密度泛函理论（DFT）用于阐明 LDH 与无机-有机复合物之间的键合和形成机制。

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引用次数: 0

Orchestrated degradation behavior of Mg mesh for calvarial bone defect reconstruction 用于腓骨缺损重建的镁网的协调降解行为

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2024-10-01 DOI: 10.1016/j.jma.2024.09.014

Ume Farwa , Seongsu Park , Myeongki Park , Ihho Park , Byoung-Gi Moon , Byong-Taek Lee

The biodegradability and biocompatibility of Mg alloys have rendered them favorable for cranial reconstruction applications. However, their rapid degradation rate has limited widespread use. In this study, we developed a Mg alloy -based mesh designed for calvarial bone defect reconstruction. We modulated the bone formation through the controlled degradation rate of the Mg alloy mesh. To achieve this, the Mg alloy mesh was coated with 2 types of coatings: Zn-d/Ca-P and Zn-d/Ca-P/P. Our findings revealed that, in comparison to the uncoated Mg alloy, both Zn-d/Ca-P and Zn-d/Ca-P/P coatings significantly reduced the degradation rate. The biocompatibility of the coated meshes improved markedly. With the Zn-d/Ca-P coating, there was not only an augmentation in the osteogenic potential of the Mg mesh but also an enhancement in angiogenic capacity. These meshed Mg samples were subsequently implanted into calvarial defects in rats. Bone regeneration was accelerated in specimens treated with Zn-d/Ca-P and Zn-d/Ca-P/P coatings compared to those with the bare Mg mesh. Furthermore, the in vivo assessments indicated that the coated meshes promoted angiogenesis. Nonetheless, the degradation rate of the Zn-d/Ca-P/P coating was slower than that of Zn-B/Ca-P. For applications requiring prolonged mechanical support, the Zn-d/Ca-P/P coating on Mg alloy is recommended, whereas the Zn-d/Ca-P coating is advisable for rapid regeneration where extended mechanical support is not critical.

镁合金的生物可降解性和生物相容性使其成为颅骨重建的理想材料。然而，它们的快速降解率限制了其广泛应用。在这项研究中，我们开发了一种基于镁合金的网片，设计用于腓骨缺损重建。我们通过控制镁合金网的降解率来调节骨形成。为此，我们在镁合金网格上涂覆了两种涂层：Zn-d/Ca-P和Zn-d/Ca-P/P。我们的研究结果表明，与未涂层的镁合金相比，Zn-d/Ca-P 和 Zn-d/Ca-P/P 涂层都能显著降低降解率。涂层网格的生物相容性明显改善。Zn-d/Ca-P 涂层不仅增强了镁网的成骨潜力，还提高了血管生成能力。这些网格镁样品随后被植入大鼠的腓骨缺损处。与使用裸镁网格的样本相比，使用 Zn-d/Ca-P 和 Zn-d/Ca-P/P 涂层处理的样本的骨再生速度更快。此外，体内评估表明，涂层网格促进了血管生成。不过，Zn-d/Ca-P/P 涂层的降解速度比 Zn-B/Ca-P 慢。对于需要长时间机械支持的应用，建议在镁合金上使用 Zn-d/Ca-P/P 涂层，而对于不需要长时间机械支持的快速再生应用，则建议使用 Zn-d/Ca-P 涂层。

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引用次数: 0

Research advances in multi-scale numerical simulations of forming and microstructures for magnesium alloys 镁合金成型和微观结构多尺度数值模拟的研究进展

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2024-10-01 DOI: 10.1016/j.jma.2024.06.031

Guo Li , Bin Li , Xingyu Bai , Hao Chen , Yuanding Huang , Yan Yang , Guobing Wei , Weidong Xie , Xiaodong Peng , Junwei Liu

It is one concern of the researchers how magnesium (Mg) alloys solidify under different conditions and how their microstructure evolves during solidification, and what are the relationship between the macroscopic properties and various microstructures. Such issues are difficult to be revealed through experiments only, especially for the newly developed Mg alloys, for which there is a lack of more systematic and mature system. However, multi-scale modeling and simulation can promote and deepen our understanding of the microstructure and its deformation mechanism. In this paper, we review and summarize the recent research progress of numerical simulation of Mg alloys in forming and microstructure, namely casting, extrusion, rolling, and welding, using crystal plasticity finite element (CPFEM) and molecular dynamics (DM) methods. Besides, the methods and innovations of modeling are also summarized. Lastly, the paper discusses the development prospects and challenges of the numerical simulation in the field of Mg alloys.

镁（Mg）合金在不同条件下如何凝固，凝固过程中的微观结构如何演变，宏观性能与各种微观结构之间的关系如何，是研究人员关心的问题之一。这些问题仅靠实验很难揭示，特别是对于新开发的镁合金，目前还缺乏较为系统和成熟的体系。然而，多尺度建模和模拟可以促进和加深我们对微观结构及其变形机理的理解。本文回顾和总结了近年来利用晶体塑性有限元（CPFEM）和分子动力学（DM）方法对镁合金的铸造、挤压、轧制和焊接等成型和微观结构进行数值模拟的研究进展。此外，还总结了建模的方法和创新。最后，论文讨论了数值模拟在镁合金领域的发展前景和挑战。

{"title":"Research advances in multi-scale numerical simulations of forming and microstructures for magnesium alloys","authors":"Guo Li , Bin Li , Xingyu Bai , Hao Chen , Yuanding Huang , Yan Yang , Guobing Wei , Weidong Xie , Xiaodong Peng , Junwei Liu","doi":"10.1016/j.jma.2024.06.031","DOIUrl":"10.1016/j.jma.2024.06.031","url":null,"abstract":"<div><div>It is one concern of the researchers how magnesium (Mg) alloys solidify under different conditions and how their microstructure evolves during solidification, and what are the relationship between the macroscopic properties and various microstructures. Such issues are difficult to be revealed through experiments only, especially for the newly developed Mg alloys, for which there is a lack of more systematic and mature system. However, multi-scale modeling and simulation can promote and deepen our understanding of the microstructure and its deformation mechanism. In this paper, we review and summarize the recent research progress of numerical simulation of Mg alloys in forming and microstructure, namely casting, extrusion, rolling, and welding, using crystal plasticity finite element (CPFEM) and molecular dynamics (DM) methods. Besides, the methods and innovations of modeling are also summarized. Lastly, the paper discusses the development prospects and challenges of the numerical simulation in the field of Mg alloys.</div></div>","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"12 10","pages":"Pages 3898-3946"},"PeriodicalIF":15.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141701163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Realizing impressive superplasticity in a low-alloyed Mg-Zn-Ca-Al-Mn alloy: The roles of grain boundary segregation and dense β-Mn particles 在低合金Mg-Zn-Ca-Al-Mn合金中实现令人印象深刻的超塑性：晶界偏析和致密β-Mn颗粒的作用

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2024-10-01 DOI: 10.1016/j.jma.2023.05.014

Tian-Shuai Wang , Zhen-Ming Hua , Cheng Wang , Min Zha , Yipeng Gao , Hui-Yuan Wang

Achieving impressive superplasticity is an important strategy to manufacture Mg alloy products with complex shapes. In the present study, we report that an excellent superplastic deformation with elongation larger than 500% can be achieved at 623 K and 1.0 × 10⁻³ s⁻¹ in a Mg-1.51Zn-0.59Ca-0.59Al-0.70Mn (wt.%, ZXAM2111) alloy fabricated by equal-channel angular pressing. The superplastic deformation is mainly carried by grain boundary sliding (GBS), accompanied by a grain size growth from ∼3.0 µm to ∼6.0 µm after deformation. Before deformation, the ZXAM2111 alloy is mainly characterized by a strong co-segregation of Zn and Ca atoms at grain boundaries and uniformly distributed β-Mn particles. With deformation proceeding, the β-Mn particles further dynamically precipitate along grain boundaries that parallel the tensile axis, leading to improved resistance to grain coarsening. Although the enhanced stabilizing effects decrease the strain rate sensitivity value, the resulting impressive microstructure stability provides a cornerstone of the active operation of GBS, facilitating the achievement of superplastic deformation. The present work could provide insight into developing low-alloyed Mg alloys with high microstructure thermal stability to achieve superplasticity.

实现令人印象深刻的超塑性是制造复杂形状镁合金产品的重要策略。在本研究中，我们报告了在 623 K 和 1.0 × 10-3 s-1 条件下，通过等通道角压制造的 Mg-1.51Zn-0.59Ca-0.59Al-0.70Mn（重量百分比，ZXAM2111）合金可以实现伸长率大于 500% 的优异超塑性变形。超塑性变形主要通过晶界滑动（GBS）进行，变形后晶粒尺寸从∼3.0 µm增长到∼6.0 µm。变形前，ZXAM2111 合金的主要特征是 Zn 原子和 Ca 原子在晶界强烈共聚，β-Mn 颗粒均匀分布。随着变形的进行，β-Mn 颗粒进一步沿着与拉伸轴平行的晶界动态析出，从而提高了抗晶粒粗化的能力。虽然增强的稳定效应降低了应变速率敏感值，但由此产生的令人印象深刻的微观结构稳定性为 GBS 的主动运行提供了基石，有助于实现超塑性变形。本研究可为开发具有高微观结构热稳定性的低合金镁合金以实现超塑性提供启示。

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引用次数: 0

Catalytic mechanisms of nickel nanoparticles for the improved dehydriding kinetics of magnesium hydride 纳米镍对改善氢氧化镁脱氢动力学的催化机理

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2024-10-01 DOI: 10.1016/j.jma.2023.07.002

Shuaijun Ding , Yuqing Qiao , Xuecheng Cai , Congcong Du , Yixuan Wen , Xun Shen , Lidong Xu , Shuang Guo , Weimin Gao , Tongde Shen

MgH₂, albeit with slow desorption kinetics, has been extensively studied as one of the most ideal solid hydrogen storage materials. Adding such catalyst as Ni can improve the desorption kinetics of MgH₂, whereas the catalytic role has been attributed to different substances such as Ni, Mg₂Ni, Mg₂NiH_0.3, and Mg₂NiH₄. In the present study, Ni nanoparticles (Ni-NPs) supported on mesoporous carbon (Ni@C) have been synthesized to improve the hydrogen desorption kinetics of MgH₂. The utilization of Ni@C largely decreases the dehydrogenation activation energy from 176.9 to 79.3 kJ mol⁻¹ and the peak temperature of dehydrogenation from 375.5 to 235 °C. The mechanism of Ni catalyst is well examined by advanced aberration-corrected environmental transmission electron microscopy and/or x-ray diffraction. During the first dehydrogenation, detailed microstructural studies reveal that the decomposition of MgH₂ is initially triggered by the Ni-NPs, which is the rate-limiting step. Subsequently, the generated Mg reacts rapidly with Ni-NPs to form Mg₂Ni, which further promotes the dehydrogenation of residual MgH₂. In the following dehydrogenation cycle, Mg₂NiH₄ can rapidly decompose into Mg₂Ni, which continuously promotes the decomposition of MgH₂. Our study not only elucidates the mechanism of Ni catalyst but also helps design and assemble catalysts with improved dehydriding kinetics of MgH₂.

尽管 MgH2 的解吸动力学较慢，但它作为最理想的固体储氢材料之一已被广泛研究。添加镍等催化剂可以改善 MgH2 的解吸动力学，而催化作用则归因于不同的物质，如镍、Mg2Ni、Mg2NiH0.3 和 Mg2NiH4。本研究在介孔碳（Ni@C）上合成了镍纳米颗粒（Ni-NPs），以改善 MgH2 的氢解吸动力学。Ni@C 的使用大大降低了脱氢活化能，从 176.9 kJ mol-1 降至 79.3 kJ mol-1，脱氢峰值温度从 375.5 ℃ 降至 235 ℃。通过先进的像差校正环境透射电子显微镜和/或 X 射线衍射，对 Ni 催化剂的机理进行了深入研究。在第一次脱氢过程中，详细的微观结构研究表明，MgH2 的分解最初是由 Ni-NPs 触发的，这是限制速率的一步。随后，生成的镁迅速与 Ni-NPs 反应生成 Mg2Ni，进一步促进残余 MgH2 的脱氢。在接下来的脱氢循环中，Mg2NiH4 可以迅速分解成 Mg2Ni，从而不断促进 MgH2 的分解。我们的研究不仅阐明了镍催化剂的作用机理，而且有助于设计和组装具有更好的 MgH2 脱水动力学性能的催化剂。

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引用次数: 0

Breaking the trade off between corrosion resistance and fatigue lifetime of the coated Mg alloy through cold spraying submicron-grain Al alloy coatings 通过冷喷涂亚微米晶粒铝合金涂层，打破了涂层镁合金的耐蚀性和疲劳寿命之间的平衡

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2024-10-01 DOI: 10.1016/j.jma.2022.12.011

XiaoTao Luo , YingKang Wei , JiHao Shen , Ninshu Ma , Chang-Jiu Li

Although magnesium (Mg) alloys are the lightest among structural metals, their inadequate corrosion resistance makes them difficult to be used in energy-saving lightweight structures. Moreover, the improvement in corrosion resistance by the conventional surface treatments is always achieved at the expense of sacrificing the fatigue lifetime. In this study, high purity aluminum (Al) and AlMgSi alloy coatings were deposited on Mg alloys via an in-situ micro-forging (MF) assisted cold spray (MFCS) process for simultaneous higher corrosion resistance and longer fatigue lifetime. Besides contributing to a highly dense microstructure, the in-situ MF also greatly refines the grain of the deposited Al alloy coating to the sub-micrometer range due to the enhanced dynamic recrystallization and also generates notable compressive residual stress up to 210 MPa within the AlMgSi coating. The absence of secondary phases in the AlMgSi alloy coatings enable the coated Mg alloy with corrosion resistance, which is even better than its bulk AlMgSi counterparts. The unique combination of refined microstructure and the prominent compressive residual stress within the AlMgSi coatings, effectively delayed the crack initiation upon repeated dynamic loading, thereby leading to ∼10 times increase in the fatigue lifetime of the Mg Alloy. However, although residual stress is also generated in the submmicro-sized grained pure Al coating, the low intrinsic strength of the coating layer leads to a lower fatigue lifetime than the uncoated Mg alloy substrate. The present work is aimed to provide a facile approach to break the trade-off between corrosion resistance improvement and fatigue lifetime of the coated Mg alloys.

虽然镁（Mg）合金是结构金属中最轻的一种，但由于其耐腐蚀性不足，很难用于节能轻质结构。此外，传统的表面处理方法总是以牺牲疲劳寿命为代价来提高耐腐蚀性。本研究通过原位微锻造（MF）辅助冷喷（MFCS）工艺，在镁合金上沉积了高纯度铝（Al）和铝镁硅合金涂层，以同时获得更高的耐腐蚀性和更长的疲劳寿命。除了有助于形成高致密的微观结构外，原位微锻还能通过增强的动态再结晶将沉积铝合金涂层的晶粒细化到亚微米范围，并在铝镁硅涂层内产生高达 210 兆帕的显著压缩残余应力。由于 AlMgSi 合金镀层中不存在次生相，因此镀层镁合金的耐腐蚀性能甚至优于块状 AlMgSi 合金。精细的微观结构和 AlMgSi 涂层中突出的压缩残余应力的独特组合，有效地延缓了反复动态加载时裂纹的产生，从而使镁合金的疲劳寿命提高了 10 倍。然而，虽然亚微粒纯铝涂层也会产生残余应力，但由于涂层的本征强度较低，导致其疲劳寿命低于未涂层的镁合金基体。本研究旨在提供一种简便的方法，以打破涂层镁合金的耐腐蚀性改善和疲劳寿命之间的权衡。

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引用次数: 0

Magnesium ferrites and their composites based photocatalysts: Synthesis approaches, effect of doping, and operational parameters on photocatalytic performance for wastewater remediation 基于铁氧体镁及其复合材料的光催化剂：用于废水修复的光催化性能的合成方法、掺杂效果和操作参数

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2024-10-01 DOI: 10.1016/j.jma.2024.10.017

Rohit Jasrotia , Kanika Raj , Suman , M. Ramya , Rajesh Kumar , Deepak Pathania , Yogesh Kumar , Abhishek Kandwal

In recent years, increased discharge of toxic effluents into water bodies has severely harmed ecosystems and human well-being. Various techniques are employed to remove contaminants, among which photocatalysis have proven to be the most environment friendly and effective technique. This review focuses on MgFe₂O₄, an exceptional photocatalyst owing to their small band gap, spherical shape, magnetic responsivity, stability, reusability, cost-effectiveness and small crystallite size. We have covered comprehensive comparison of research studies from the past decade to assess. Magnesium ferrite's photocatalytic potential in pure, doped, and composite forms. Along with synthesis methods, degradation mechanisms, and shortcomings explained in detail. Furthermore, we have highlighted the enhanced photocatalytic capability of doped MgFe₂O₄ and their nanocomposites towards the various organic contaminants upon visible light irradiation under a comparatively short period of time. Factors like cation distribution, dosage, pH, as well as methods for recovery and reuse are discussed to aid in production of more efficient photocatalysts. There has been a lack of information on the techniques that can be used to overcome the various shortcomings of MgFe₂O₄ ferrite. Hence, we have accentuated on bringing forth such advanced techniques that would aid in driving the researchers’ attention towards the practical and industrial application of the hybrid MgFe₂O₄ nanoparticles. Lastly, the research gaps and industrial need of MgFe₂O₄ ferrite-based materials were addressed to offer a concise view.

近年来，越来越多的有毒废水排入水体，严重危害了生态系统和人类福祉。人们采用了各种技术来清除污染物，其中光催化技术已被证明是最环保、最有效的技术。由于 MgFe2O4 的带隙小、球形、磁响应性、稳定性、可重复使用性、成本效益和结晶尺寸小，因此它是一种特殊的光催化剂。我们对过去十年的研究进行了全面的比较和评估。纯、掺杂和复合形式的镁铁氧体的光催化潜力。同时还详细解释了合成方法、降解机制和缺点。此外，我们还强调了掺杂的 MgFe2O4 及其纳米复合材料在可见光照射下，在相对较短的时间内对各种有机污染物的光催化能力。讨论了阳离子分布、用量、pH 值以及回收和再利用方法等因素，以帮助生产更高效的光催化剂。目前还缺乏有关可用于克服 MgFe2O4 铁氧体各种缺点的技术的信息。因此，我们着重提出了这些先进技术，它们将有助于推动研究人员关注混合 MgFe2O4 纳米粒子的实际和工业应用。最后，我们对 MgFe2O4 铁氧体基材料的研究空白和工业需求进行了探讨，以提供一个简明的观点。

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引用次数: 0

One developed finite element model used in nano-layered flaky Ti2AlC MAX ceramic particles reinforced magnesium composite 建立了纳米层状片状ti2alcmax陶瓷颗粒增强镁复合材料的有限元模型

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys

Pub Date : 2024-10-01 DOI: 10.1016/j.jma.2023.04.009

Wantong Chen , Jingyu Yang , Wenbo Yu , Yishi Su , Ang Zhang , Chaosheng Ma , Yihu Ma

As one novel reinforcement used in magnesium composite, nano-layered flaky ternary MAX particle exhibits interesting anisotropic ceramic and metal properties. In order to accurately simulate the mechanical properties and damage behavior of MAX particle reinforced magnesium composite, we developed one finite element (FE) model based on 2D and 3D microstructural observations of 10 vol.% Ti₂AlC-AZ91D composite. To improve the accuracy, matrix ductile damage, particle internal delamination deformation behaviors, and particle-matrix interfacial behaviors were respectively introduced into this model. The visual deformation processes of crack generation and propagation were carefully presented and discussed. The effects of interfacial strength and particle orientation on material properties were systematically investigated.

作为镁复合材料中使用的一种新型增强材料，纳米层状片状三元 MAX 粒子表现出有趣的各向异性陶瓷和金属特性。为了准确模拟 MAX 粒子增强镁复合材料的力学性能和损伤行为，我们基于 10 vol.% Ti2AlC-AZ91D 复合材料的二维和三维微观结构观测结果，开发了一种有限元（FE）模型。为了提高模型的准确性，我们在模型中分别引入了基体延性损伤、颗粒内部分层变形行为和颗粒-基体界面行为。对裂纹产生和扩展的可视化变形过程进行了细致的描述和讨论。系统研究了界面强度和颗粒取向对材料性能的影响。

引用次数: 0