Journal of Magnesium and Alloys最新文献

{"title":"Effect of cooling rate on corrosion resistance and behavior of micro-alloyed cast AZ91-Ca-Y alloy","authors":"Hongxiu Liu, Jun-Ho Bae, Jae-Wook Kang, Jun-Seob Lee, Jae-Yeon Kim, Bong-Sun You","doi":"10.1016/j.jma.2025.02.026","DOIUrl":"https://doi.org/10.1016/j.jma.2025.02.026","url":null,"abstract":"Micro-alloying is an effective approach for improving the corrosion resistance of cast AZ91. However, the effect of micro-alloyed elements on corrosion resistance can be varied depending on the solidification rate influencing the diffusion and precipitation behavior of micro-alloying elements. This study investigated the effects of the cooling rate on the microstructure and corrosion behavior of micro-Ca and -Y alloyed cast AZ91 alloy (i.e., AZXW9100). To achieve various cooling rates, the alloys were prepared using three methods: steel mold casting (SMC), copper step mold casting (CSMC), and high-pressure die casting (HPDC). The corrosion behavior was analyzed through weight loss measurements, electrochemical impedance spectroscopy, and corrosion morphology observations. The results showed that the key microstructural factors influencing corrosion resistance differed between short- and long-term corrosion. As the cooling rate increased, the short-term corrosion rate was lowered from 0.91 mm/y (SMC) to 0.38 mm/y (HPDC), which was attributed to the decrease in the total area fractions of the eutectic α and β phases acting as galvanic corrosion sources. The long-term corrosion rate was reduced from 17.20 mm/y (SMC) to 0.71 mm/y (HPDC), which was revealed to be due to the enhanced connectivity of the β phase acting as corrosion barriers. Meanwhile, the increase in the cooling rate led to a modification of the Zn molar ratio in the β phase, reducing the Volta potential of the β phase from 101.8 mV to 66.9 mV. This reduction in the Volta potential of the main galvanic source also contributed to improved corrosion resistance. The HPDC AZXW9100 alloy produced in this study exhibited the lowest corrosion rate compared to other alloys. These findings suggest that controlling the cooling rate is a promising strategy for enhancing the corrosion resistance of AZXW9100 alloys.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"18 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143736361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comprehensive overview in improving corrosion resistance of Mg alloys: Enhancing protective coatings with plasma electrolytic oxidation and superhydrophobic coatings","authors":"Arash Fattah-alhosseini, Haniye Salimi, Minoo Karbasi","doi":"10.1016/j.jma.2025.02.023","DOIUrl":"https://doi.org/10.1016/j.jma.2025.02.023","url":null,"abstract":"The corrosion resistance of magnesium alloys is a significant concern in industries seeking to use these materials for lightweight structures. Plasma electrolytic oxidation (PEO) is a process that forms a ceramic oxide film on Mg alloy surfaces, effectively enhancing their corrosion performance in the short term. In this regard, optimizing PEO process parameters is crucial for creating a stable oxide layer. An improved level of corrosion resistance is ensured by applying superhydrophobic coating (SHC) on top of the PEO layer to prevent moisture infiltration, creating air pockets on the surface. Various methods are employed to fabricate SHC on Mg alloys, including techniques like electrophoretic deposition (EPD), Hydrothermal (HT), dip, and spray coating. The synergistic combination of PEO and SHC coatings has demonstrated encouraging outcomes in enhancing the corrosion performance of Mg alloys. This study offers an extensive overview of recent progress in the preparation, characterization, and corrosion behavior of Mg alloys by employing PEO coatings and SHC treatment processes.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"57 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143713193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of tensile twinning on texture and microstructure evolution of Mg-3Al-1Zn-1Ca alloy under in-plane shear deformation","authors":"Saurav Kumar, Mahesh Panchal, Appala N. Gandi, Lalit Kaushik, Shi-Hoon Choi, Jaiveer Singh","doi":"10.1016/j.jma.2025.02.017","DOIUrl":"https://doi.org/10.1016/j.jma.2025.02.017","url":null,"abstract":"The evolution of microstructure and texture in Mg-3Al-1Zn-1Ca alloy sheets subjected to in-plane shear (IPS) loading was investigated using experimental techniques and viscoplastic self-consistent (VPSC) modeling. The specimens were deformed under varying degrees of IPS strain (γ₁₂ = 0.05, 0.10, and 0.15) using a customized jig. Electron backscatter diffraction (EBSD) observations revealed profuse tensile twinning (TTW) even at an IPS strain of 0.05, with its intensity continuously increased as the IPS strain increased. The TTWs progressively engulfed parent grains with increasing shear strain, evolving into an unusual deformation twin morphology. Furthermore, VPSC model predictions confirmed basal slip as the dominant deformation mode at low IPS strains, transitioning to prismatic slip dominance at higher IPS strains. The activity of the TTW mode was significantly higher during the initial stages of IPS strain and saturated to lower values at higher strains. VPSC simulation results also indicated preferential shear accumulation on a single twin system, explaining the phenomenon of a single twin variant engulfing a parent grain. Additionally, the influence of individual slip and twin modes on texture evolution was evaluated through orientation tracking of representative grains at various shear strain increments using VPSC simulation. The simulation results quantitatively highlighted the activities of basal slip, prismatic slip, and tensile twinning, establishing a correlation between texture evolution and the underlying deformation mechanisms.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"98 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143713136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Metallic glass-coated composite polyethylene terephthalate artificial ligament with enhanced mechanical and frictional wear properties","authors":"Yanju Hui, Xingwang Liu, Wenhui He, Binyao Liu, Kang Sun, Gang Wang","doi":"10.1016/j.jma.2025.02.028","DOIUrl":"https://doi.org/10.1016/j.jma.2025.02.028","url":null,"abstract":"Gadolinium (Gd) and yttrium (Y) elements were added to the composition design and sputtering process to create a composite artificial ligament with enhanced mechanical and frictional wear performance. Due to the oxidative and adhesive wear mechanisms, MgZnCaY metallic glass (MG) films exhibit a reduced scratch depth, a lower friction coefficient, and better wear resistance than MgZnCaGd. The wear coefficients of MgZnCaGd and MgZnCaY are 1.45 ± 0.04 and 0.99 ± 0.068, respectively. MgZnCaY MG coating has a higher hardness (8.64 ± 0.01 GPa) and Young's modulus (144.67 ± 1.57 GPa) than MgZnCaGd MG coating (4.90 ± 1.86 GPa, 110.4 ± 23.2 GPa). The MgZnCaY composite-coated artificial ligament has 49.02 MPa and 18.54% elongation at break, compared to 49.86 MPa and 15.19% for the MgZnCaGd coating. The results of the mechanical test shows that the coated composite artificial ligament allows for greater fracture elongation and appropriate stiffness during the stretching process. Because of the formation of Y₂O₃, which can strengthen the interfacial bonding strength between the adhesive layer and the ligament matrix, increase the adherence of oxides, and reduce the likelihood of oxide delamination, artificial ligaments coated with MgZnGaY also perform exceptionally well mechanically. The current research findings provide new insights for the design of composite artificial ligaments and present promising materials for applications in the field of artificial ligaments.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"89 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143713135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A quasi-in-situ EBSD study on mechanical response and twin variant selection of a hot-rolled AZ31 magnesium alloy","authors":"Huicong Chen, Chenwei Shao, Lijun Wang, Hao Chen, Yu Zou","doi":"10.1016/j.jma.2025.02.021","DOIUrl":"https://doi.org/10.1016/j.jma.2025.02.021","url":null,"abstract":"The selection of twin variants plays a critical role in shaping the deformation texture and mechanical properties of magnesium alloys that are limited by slip systems and diverse twinning modes. In this study, we investigated the twin variant selection and the effect of twinning activity on the strain hardening of a hot-rolled AZ31 magnesium alloy by quasi-in-situ EBSD. Moreover, the Schmid factors and the displacement gradient tensors were computed to evaluate the activation of twin variants. The results reveal that the yield strength increased progressively after each deformation step, driven by grain subdivision and texture hardening induced by extension <span><span style=\"\"></span><span data-mathml='<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow is=\"true\"><mo is=\"true\">{</mo><mrow is=\"true\"><mn is=\"true\">10</mn><mover accent=\"true\" is=\"true\"><mn is=\"true\">1</mn><mo is=\"true\">¯</mo></mover><mn is=\"true\">2</mn></mrow><mo is=\"true\">}</mo></mrow></math>' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"><svg aria-hidden=\"true\" focusable=\"false\" height=\"2.779ex\" role=\"img\" style=\"vertical-align: -0.812ex;\" viewbox=\"0 -846.5 3073 1196.3\" width=\"7.137ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><g is=\"true\"><use is=\"true\" xlink:href=\"#MJMAIN-7B\"></use><g is=\"true\" transform=\"translate(500,0)\"><g is=\"true\"><use xlink:href=\"#MJMAIN-31\"></use><use x=\"500\" xlink:href=\"#MJMAIN-30\" y=\"0\"></use></g><g is=\"true\" transform=\"translate(1001,0)\"><g is=\"true\" transform=\"translate(35,0)\"><use xlink:href=\"#MJMAIN-31\"></use></g><g is=\"true\" transform=\"translate(0,198)\"><use x=\"-70\" xlink:href=\"#MJMAIN-AF\" y=\"0\"></use><use x=\"70\" xlink:href=\"#MJMAIN-AF\" y=\"0\"></use></g></g><g is=\"true\" transform=\"translate(1571,0)\"><use xlink:href=\"#MJMAIN-32\"></use></g></g><use is=\"true\" x=\"2572\" xlink:href=\"#MJMAIN-7D\" y=\"0\"></use></g></g></svg><span role=\"presentation\"><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow is=\"true\"><mo is=\"true\">{</mo><mrow is=\"true\"><mn is=\"true\">10</mn><mover accent=\"true\" is=\"true\"><mn is=\"true\">1</mn><mo is=\"true\">¯</mo></mover><mn is=\"true\">2</mn></mrow><mo is=\"true\">}</mo></mrow></math></span></span><script type=\"math/mml\"><math><mrow is=\"true\"><mo is=\"true\">{</mo><mrow is=\"true\"><mn is=\"true\">10</mn><mover accent=\"true\" is=\"true\"><mn is=\"true\">1</mn><mo is=\"true\">¯</mo></mover><mn is=\"true\">2</mn></mrow><mo is=\"true\">}</mo></mrow></math></script></span> twinning and the Basinski effect at large strains. The nucleation and growth of the <span><span style=\"\"></span><span data-mathml='<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mrow is=\"true\"><mo is=\"true\">{</mo><mrow is=\"true\"><mn is=\"true\">10</mn><mover accent=","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"34 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143713192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced corrosion resistance of calcium carbonate coatings on magnesium alloy via simple stearic acid treatment","authors":"Tianxiao Wang, Panpan Li, Yunting Guo, Yingchao Xu, Wen Kou, Guangyu Li, Jianshe Lian","doi":"10.1016/j.jma.2025.02.022","DOIUrl":"https://doi.org/10.1016/j.jma.2025.02.022","url":null,"abstract":"Magnesium alloy is a promising biodegradable metal material for hard tissue engineering. However, its high corrosion rate limits its application. In our previous study, we biomimetically deposited a calcium carbonate coating on the surface of magnesium alloy using siloxane induction. This calcium carbonate coating demonstrated excellent <em>in vitro</em> biocompatibility and provided partial protection for the magnesium alloy substrate. In this study, we further enhanced the corrosion resistance of the calcium carbonate coating by treating it with stearic acid and its derivative, sodium stearate. Electrochemical corrosion tests revealed that the sodium stearate-treated calcium carbonate coating reduced the corrosion rate by two orders of magnitude. Additionally, <em>in vitro</em> biocompatibility assessments showed that while the biocompatibility of the sodium stearate-treated coating was slightly reduced, it remained acceptable compared to the magnesium substrate. This study builds on our previous work and offers a promising reinforcement strategy for degradable magnesium alloys in medical applications.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"22 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143723925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mathematical modeling of salicylate effects on high-purity Mg anode for aqueous primary Mg-Air batteries","authors":"Wen Xu, Yulong Wu, Darya Snihirova, Linqian Wang, Min Deng, Cheng Wang, Sviatlana V. Lamaka, Mikhail L. Zheludkevich, Daniel Höche","doi":"10.1016/j.jma.2025.02.027","DOIUrl":"https://doi.org/10.1016/j.jma.2025.02.027","url":null,"abstract":"This study investigates the effectiveness of salicylate (SAL) as an electrolyte additive on the discharge behavior of high-purity (HP) Mg anode in an aqueous half-cell system, using an integrated approach of mathematical modeling and experimental analysis. A finite element-based model is developed to elucidate the key mechanisms by which SAL influences the voltage profile and pH. Systematic electrochemical measurements, especially intermittent discharge tests combined with electrochemical impedance spectroscopy (EIS), demonstrate that SAL can enhance initial voltage stability of HP Mg anode. Moreover, the model incorporates the SAL-Mg complexation factor to describe the role of SAL in modifying the deposit film on HP Mg surface. The agreement between model predictions and experimental observations suggests that SAL facilitates the formation of compact Mg(OH)₂ deposits and sustains a favorable pH environment within the half-cell compartment. This integrated approach provides new insights into understanding and optimizing additive effects for Mg-air batteries.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"16 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143723728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In situ diffraction study on the annealing performance of a rapidly solidified ribbon consolidated Mg-Ca-Y-Zn-Mn alloy","authors":"Jenő Gubicza, Kristián Máthis, Péter Nagy, Péter Jenei, Zoltán Hegedűs, Andrea Farkas, Jozef Veselý, Shin-ichi Inoue, Daria Drozdenko, Yoshihito Kawamura","doi":"10.1016/j.jma.2025.02.024","DOIUrl":"https://doi.org/10.1016/j.jma.2025.02.024","url":null,"abstract":"Dilute Mg alloys processed by the rapidly solidified ribbon consolidation (RSRC) technique are candidate materials for structural applications due to their enhanced mechanical performance. The thermal stability of the structure in these alloys strongly influences their mechanical performance at elevated temperatures. In this study, an RSRC-processed Mg—1 % Ca—0.5 % Zn—0.1 % Y—0.03 % Mn (at%) alloy was heated at a constant rate up to 833 K, and concurrently in situ X-ray diffraction (XRD) measurements were performed using synchrotron radiation in order to monitor the changes in the structure. In addition, ex situ electron microscopy investigations were carried out before and after annealing to complete the XRD study. On the basis of XRD results, the stages of the microstructure evolution during heating were identified. In addition, the thermal expansion coefficients of the matrix and the Mg₂Ca secondary phase were determined. Between 299 and 400 K, the lattice constants of both the matrix and the Mg₂Ca phase increased due to thermal expansion. In the temperature range of 400-673 <span>K</span>, the increase of the lattice constants with increasing the temperature continued, but their rate was different for the two phases which can induce thermal stresses. Between 673 and 753 K, the lattice constants of the secondary phase did not change most probably due to the compensating effects of the thermal expansion and the decrease of the Ca content. In the temperature range of 753–793 K, the Mg₂Ca phase started to dissolve. Between 793 and 833 K the dissolution continued, and additionally the matrix was partially melted.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"29 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143713131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The influence of heat-treatment on regulating the content and morphology of LPSO phase in Mg-Y-Al alloy and its strengthening mechanism at room temperature","authors":"Qianlong Ren, Jie Mi, Jinhui Wang, Shengquan Liang, Yunzhao Feng","doi":"10.1016/j.jma.2025.02.020","DOIUrl":"https://doi.org/10.1016/j.jma.2025.02.020","url":null,"abstract":"The LPSO phase can effectively enhance the mechanical properties of Mg alloys. To investigate the impact of different LPSO phase contents and morphologies on the mechanical properties and strengthening mechanisms of Mg-Y-Al alloys under room temperature deformation, this study prepared Mg-12Y-1Al (WA121) alloys containing Bulk-LPSO (B-LPSO), Lattice-LPSO (L-LPSO), and Needle-like LPSO (N-LPSO) with different contents through different heat-treatment processes. The results indicate that with the increase in heat treatment time, the contents of B-LPSO phases remain essentially unchanged, and the contents of L-LPSO and N-LPSO phases gradually increase. The increase in N-LPSO phase content is the most pronounced, with the highest content (7.29%) observed in the alloy treated for 4.5 h. Moreover, the alloy treated for 4.5 h exhibits the best mechanical properties, with ultimate tensile strength (UTS), tensile yield strength (TYS), and elongation (EL) values of 177 MPa, 139 MPa, and 4.27%, respectively. Compared to the as-cast alloy, UTS, TYS, and EL increased by 9.94%, 11.2%, and 27.1%, respectively. The study reveals that all three LPSO phases exhibit excellent dislocation hindering effects, effectively enhancing strength of the alloy. Additionally, the N-LPSO phase, due to its dense distribution, forms numerous dislocation channels within the grains, dispersing stress concentration within the grains to improve plasticity of the alloy. Furthermore, the interaction between the N-LPSO phase and the other phases in the alloy can also enhance plasticity of the alloy. Therefore, the alloy treated for 4.5 h demonstrates a synergistic improvement in strength and plasticity. Research has revealed that the precipitation mechanism of the N-LPSO phase in the as-cast WA121 alloy involves the formation of an Al-rich region adjacent to the needle-like Mg₂₄Y₅ phase. Subsequently, the Y element provided by the dissolving Mg₂₄Y₅ phase reacts with this region, ultimately leading to the formation of the needle-like LPSO phase.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"72 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143713137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Morphology transition engineering on MgO for enhanced dye adsorption without using surfactants as sacrifice templates","authors":"Jie Xu, Jiajun Xu, Shiai Xu, Rujie Li, Beibei Sun, Zhongbiao Wang, Jiaxu Cheng, Kesong Chai, Chao Zhang","doi":"10.1016/j.jma.2025.02.019","DOIUrl":"https://doi.org/10.1016/j.jma.2025.02.019","url":null,"abstract":"Hierarchical porous MgO is a promising adsorbent for dye removal because of its large Brunauer–Emmett–Teller specific surface area (<em>S</em>_BET) and abundant low-coordinated oxygen anions (LCO) sites. As hierarchical porous MgO particles with large <em>S</em>_BET values are typically prepared by complicated procedures under harsh conditions, such as high temperatures and high pressures, their large-scale production is impractical. Consequently, the preparation of hierarchical porous MgO with a large <em>S</em>_BET value under mild conditions is highly desirable. In this study, a morphology transition engineering strategy is introduced to change the morphology of simple MgO microspheres to an embroidered ball-shaped with a larger <em>S</em>_BET value via hydrolysis and calcination without using surfactants as sacrificial templates. During hydrolysis, numerous Mg(OH)₂ sheets form and attach to the MgO surface, thus increasing the <em>S</em>_BET value of the newly obtained MgO that forms by calcination (denoted as NM-<em>x</em>, where <em>x</em> is the hydrolysis time in hours). The sizes of the crystalline sheets were tuned by controlling the hydrolysis time. NM-12 exhibited the highest density of small-sized sheets on its surface and the largest <em>S</em>_BET value of 180.17 m² g⁻¹, which was 3.51 times that of the MgO precursor (51.89 m² g⁻¹). However, NM-24 (134.07 m² g⁻¹) had a higher adsorption efficiency for Congo red (CR) than NM-12, despite having a smaller <em>S</em>_BET value, which indicates that other factors are involved. NM-24 exhibited a lower probability of exposed (200) and (220) facets which were verified to repulse CR molecules by molecular dynamics simulations, and a greater number of LCO sites, which contributed to adsorption. Thus, this study introduces a facile method for preparing hierarchical porous MgO and examines the effects of LCO sites and exposed facet probabilities on its adsorption properties.","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":"29 1","pages":""},"PeriodicalIF":17.6,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143713198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}