Journal of Rare Earths最新文献

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Photoelectric properties of the semiconductor Bi2YbO4Cl with broad spectral response 具有广谱响应的半导体Bi2YbO4Cl的光电特性
IF 7.2 1区 化学
Journal of Rare Earths Pub Date : 2024-09-14 DOI: 10.1016/j.jre.2024.09.016
Qibing Li , Hong Li , Kai Zhang , Tianwu Wang , Guangyou Fang
{"title":"Photoelectric properties of the semiconductor Bi2YbO4Cl with broad spectral response","authors":"Qibing Li ,&nbsp;Hong Li ,&nbsp;Kai Zhang ,&nbsp;Tianwu Wang ,&nbsp;Guangyou Fang","doi":"10.1016/j.jre.2024.09.016","DOIUrl":"10.1016/j.jre.2024.09.016","url":null,"abstract":"<div><div>Bi<sub>2</sub>YbO<sub>4</sub><span>Cl with a fluorite layer structure belongs to the family of the bismuth rare-earth oxyhalides Bi</span><sub>2</sub>REO<sub>4</sub>X (X = Cl, Br, I). However, the synthesis and photoelectric properties of Bi<sub>2</sub>YbO<sub>4</sub>Cl have almost not been reported. In this work, Bi<sub>2</sub>YbO<sub>4</sub>Cl was synthesized using the solid-state method and the solvothermal method. Yb<sup>3+</sup><span> ions show a strong characteristic absorption peak at 980 nm, which was measured by ultraviolet–visible–near-infrared absorption spectra<span>. The transient photoconductivity of Bi</span></span><sub>2</sub>YbO<sub>4</sub><span>Cl was obtained by time-resolved terahertz spectroscopy<span> system under 400 and 800 nm laser excitations<span>, respectively. The frequency-dependent transient photoconductivity analysis reveals the Drude-Smith behavior in Bi</span></span></span><sub>2</sub>YbO<sub>4</sub><span><span>Cl. Under photoexcitation, the hot charge carriers with a long relaxation lifetime and a </span>carrier mobility of 48 cm</span><sup>2</sup>/(V·s) are obtained. The synthesis of Bi<sub>2</sub>YbO<sub>4</sub><span>Cl is of great significance for the development of novel photocatalytic and photoharvesting materials with broad spectral response.</span></div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 9","pages":"Pages 1852-1858"},"PeriodicalIF":7.2,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144865740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Enhanced mechanical properties of LPSOp/Mg composites using super high pressure treatment 利用超高压处理增强 LPSOp/Mg 复合材料的机械性能
IF 5.2 1区 化学
Journal of Rare Earths Pub Date : 2024-09-14 DOI: 10.1016/j.jre.2024.09.014
Wei Yu , Zhongjie Li , Chao Liu , Qiuming Peng , Weili Cheng , Huashun Yu , Kwang Seon Shin , Hui Yu
{"title":"Enhanced mechanical properties of LPSOp/Mg composites using super high pressure treatment","authors":"Wei Yu ,&nbsp;Zhongjie Li ,&nbsp;Chao Liu ,&nbsp;Qiuming Peng ,&nbsp;Weili Cheng ,&nbsp;Huashun Yu ,&nbsp;Kwang Seon Shin ,&nbsp;Hui Yu","doi":"10.1016/j.jre.2024.09.014","DOIUrl":"10.1016/j.jre.2024.09.014","url":null,"abstract":"<div><div>The super high pressure (SHP) technique was employed to fabricate the magnesium matrix composites (MMCs) reinforced with long-period stacking order structure powder (LPSOp) by cubic-anvil large-volume press with six rams. The LPSOp was optimized through high energy ball milling (HEBM) with a chemical composition of Mg<sub>85</sub>Zn<sub>6</sub>Y<sub>9</sub> (at%). The microstructure and mechanical properties of LPSOp/Mg composite was characterized by X-ray diffraction (XRD), scanning electron microscopy/transmission electron microscopy (SEM/EDS), transmission electron microscopy (TEM), microhardness and compressive tests. The microhardness of LPSOp exhibits a notable increase after HEBM, and the thermal stability of LPSOp is affirmed through elevated annealing. The SHPed LPSOp/Mg consists of Mg and LPSO phase. Upon annealing at 400 °C for 1 h, the LPSO phase precipitates from solid solution of Mg and W phase is also identified. The strength of composites by SHP treatment and subsequently annealing is significantly improved compared with the pure Mg without LPSOp, which demonstrates the maximum compression yield strength (CYS) of 250 MPa and ultimate compression strength (UCS) of 375 MPa with satisfactory ductility. The enhanced mechanical properties are attributed to the synergistic reinforcement effects of the dispersed and 3D skeletal structure of LPSOp with excellent interfacial bonding, the coexistence of nano-scale LPSO and W phase and partial solid solution strengthening.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"42 12","pages":"Pages 2249-2258"},"PeriodicalIF":5.2,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Rare earth based photocatalysts for hydrogen peroxide production 过氧化氢生产用稀土基光催化剂
IF 5.2 1区 化学
Journal of Rare Earths Pub Date : 2024-09-14 DOI: 10.1016/j.jre.2024.09.013
Bailin Gao , Zhaodong Wang , Tengyang Gao , Saisai Yuan , Hui Yang , Chuanxiang Chen
{"title":"Rare earth based photocatalysts for hydrogen peroxide production","authors":"Bailin Gao ,&nbsp;Zhaodong Wang ,&nbsp;Tengyang Gao ,&nbsp;Saisai Yuan ,&nbsp;Hui Yang ,&nbsp;Chuanxiang Chen","doi":"10.1016/j.jre.2024.09.013","DOIUrl":"10.1016/j.jre.2024.09.013","url":null,"abstract":"<div><div>Hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) is a versatile compound with widespread applications in various industries. In addition, it has attracted interest as a potential energy carrier due to its high energy density and ability to release oxygen upon decomposition. The development of photocatalytic technology has enabled sustainable production of H<sub>2</sub>O<sub>2</sub>. Various structural materials, including organic molecules, polymers, and metal coordination compounds, have been synthesized for investigating photocatalytic H<sub>2</sub>O<sub>2</sub> production. Rare earth materials, in particular, are of interest due to their adjustable porosity and controllable metal active sites, making them valuable for research in this field. These materials have excellent photoelectric properties, making them promise for the photocatalytic synthesis of H<sub>2</sub>O<sub>2</sub>. Despite limited reports on systematic reviews of photocatalytic H<sub>2</sub>O<sub>2</sub> production using rare earth materials, this study introduces the principles and advancements in this area. It reviews different methods of photocatalytic synthesis of H<sub>2</sub>O<sub>2</sub>, focusing on rare earth elements. Through comprehensive analysis and systematic studies in the existing literature, a deeper understanding of enhanced photocatalytic performance has been achieved. This research not only contributes to advancing fundamental knowledge but also provides a solid foundation for practical applications.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 3","pages":"Pages 405-416"},"PeriodicalIF":5.2,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Poly(ionic liquids-acrylic acid)-modified MIL-101(Cr) metal−organic frameworks: Preparation and efficient adsorption of europium 聚离子液体-丙烯酸-改性MIL-101(Cr)金属有机骨架:制备及对铕的高效吸附
IF 5.2 1区 化学
Journal of Rare Earths Pub Date : 2024-09-14 DOI: 10.1016/j.jre.2024.09.017
Xiayu Liang , Aylin M. Deliormanlı , Qingle Zeng
{"title":"Poly(ionic liquids-acrylic acid)-modified MIL-101(Cr) metal−organic frameworks: Preparation and efficient adsorption of europium","authors":"Xiayu Liang ,&nbsp;Aylin M. Deliormanlı ,&nbsp;Qingle Zeng","doi":"10.1016/j.jre.2024.09.017","DOIUrl":"10.1016/j.jre.2024.09.017","url":null,"abstract":"<div><div>A novel composite material, Poly(IL-AA)@MIL-101(Cr), combining metal–organic framework, polymeric ionic liquid and acrylic acid, was synthesized for the selective and efficient adsorption of rare earths europium(III) (Eu<sup>3+</sup>). Characterization of the materials was carried out using techniques such as X-ray diffraction (XRD), Fourier transform infrared (FTIR), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), thermogravimetric analysis (TGA) and Brunauer–Emmett–Teller (BET). The results demonstrate successful incorporation of the polymeric ionic liquid onto the material surface while preserving the crystal structure and morphology of MIL-101(Cr). Adsorption experiments were conducted to explore parameters including equilibrium pH, initial Eu<sup>3+</sup> concentration, and duration, with comprehensive analyses of adsorption kinetics, isotherms, and mechanisms. Findings reveal that Poly(IL1-AA)@MIL-101(Cr), Poly(IL3-AA)@MIL-101(Cr), and Poly(IL5-AA)@MIL-101(Cr) achieve adsorption equilibrium for Eu<sup>3+</sup> at approximately 9 h with an equilibrium pH of 6.2. The adsorption of Eu<sup>3+</sup> predominantly follows a pseudo-second-order kinetic model and Langmuir isotherm adsorption model. Moreover, the prepared composite material exhibits superior adsorption selectivity for Eu<sup>3+</sup> over other metal ions in the mixture (K<sup>+</sup>, Mg<sup>2+</sup>, Ni<sup>2+</sup>, Co<sup>2+</sup>, Zn<sup>2+</sup>, La<sup>3+</sup>, and Nd<sup>3+</sup>). Even after five adsorption–desorption cycles, the composite material maintains satisfactory adsorption performance.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 8","pages":"Pages 1736-1745"},"PeriodicalIF":5.2,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144696633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Boosting CO oxidation performance via reaction-induced single-atom active site: DFT and microkinetic investigation of a unified CO oxidation mechanism on Gd-doped ceria-supported copper catalysts 通过反应诱导的单原子活性位点提高CO氧化性能:gd掺杂铈负载铜催化剂CO氧化统一机理的DFT和微动力学研究
IF 7.2 1区 化学
Journal of Rare Earths Pub Date : 2024-09-14 DOI: 10.1016/j.jre.2024.09.015
Dongyuan Liu , Houyu Zhu , Xiaoxiao Gong , Yucheng Fan , Zhennan Liu , Xiaohan Li , Xin Wang , Wen Zhao , Hao Ren , Wenyue Guo
{"title":"Boosting CO oxidation performance via reaction-induced single-atom active site: DFT and microkinetic investigation of a unified CO oxidation mechanism on Gd-doped ceria-supported copper catalysts","authors":"Dongyuan Liu ,&nbsp;Houyu Zhu ,&nbsp;Xiaoxiao Gong ,&nbsp;Yucheng Fan ,&nbsp;Zhennan Liu ,&nbsp;Xiaohan Li ,&nbsp;Xin Wang ,&nbsp;Wen Zhao ,&nbsp;Hao Ren ,&nbsp;Wenyue Guo","doi":"10.1016/j.jre.2024.09.015","DOIUrl":"10.1016/j.jre.2024.09.015","url":null,"abstract":"<div><div>Single-atom (SA) catalysts have emerged as a pivotal area drawing extensive research interest due to their high catalytic activities. However, SA catalysts are often plagued by the aggregation and deactivation of SA sites under reaction conditions. This study focuses on CO oxidation over Gd-doped ceria-supported Cu catalysts and aims to provide a new strategy to stabilize the SA site, in which a Cu SA site is “prestored” in a relatively stable Cu cluster and can be dynamically activated under reaction conditions. Three typical Cu<sub>10</sub>/CeO<sub>2</sub> catalyst models were built with different Gd-doping contents, which are pristine Cu<sub>10</sub>/CeO<sub>2</sub>, Cu<sub>10</sub>/Gd<sub>0.125</sub>Ce<sub>0.875</sub>O<sub>2</sub>, and Cu<sub>10</sub>/Gd<sub>0.25</sub>Ce<sub>0.75</sub>O<sub>2</sub>, respectively. We performed density functional theory (DFT) calculations on the Cu<sub>10</sub>/Gd-CeO<sub>2</sub> system to investigate the adsorption of CO and O<sub>2</sub> molecules, the formation of surface oxygen vacancy (O<sub>V</sub>) and dynamic Cu SA site, and potential energy surfaces of CO oxidation process. <em>Ab initio</em> thermodynamic analysis suggests that the saturation adsorption of CO on Cu<sub>10</sub> and high Gd-doping in CeO<sub>2</sub> lead to a spontaneously formed single Cu−CO site and an O<sub>V</sub> defect on ceria surface. The CO oxidation process is identified as a two-paths-coupled catalytic cycle, in which Path I is activated by the terminal O atom of adsorbed O<sub>2</sub> at surface O<sub>V</sub> site while Path II initiates with the lattice O atom of CeO<sub>2</sub> surface. The microkinetic modeling demonstrates that the dominant pathway is Path I for the undoped and low-doping cases, and Path II for the high-doping case which exhibits a novel mechanism for CO oxidation and the highest reaction activity due to the participation of the dynamic SA site.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 9","pages":"Pages 1870-1881"},"PeriodicalIF":7.2,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144865959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Realization of blue-red dual-emission via energy transfer in Na3KMg7(PO4)6: Eu2+, Mn2+ phosphor for plant growth application Na3KMg7(PO4)6: Eu2+, Mn2+荧光粉中的能量转移实现蓝-红双发射,用于植物生长
IF 7.2 1区 化学
Journal of Rare Earths Pub Date : 2024-09-13 DOI: 10.1016/j.jre.2024.09.012
Ruijie Ji, Takatoshi Seto, Yuhua Wang
{"title":"Realization of blue-red dual-emission via energy transfer in Na3KMg7(PO4)6: Eu2+, Mn2+ phosphor for plant growth application","authors":"Ruijie Ji,&nbsp;Takatoshi Seto,&nbsp;Yuhua Wang","doi":"10.1016/j.jre.2024.09.012","DOIUrl":"10.1016/j.jre.2024.09.012","url":null,"abstract":"<div><div>A blue-red dual-emitting phosphor, Na<sub>3</sub>KMg<sub>7</sub>(PO<sub>4</sub>)<sub>6</sub>: Eu<sup>2+</sup>, Mn<sup>2+</sup> was developed in this study. Eu<sup>2+</sup> acts as a sensitizer ion in Na<sub>3</sub>KMg<sub>7</sub>(PO<sub>4</sub>)<sub>6</sub>: Mn<sup>2+</sup>, which significantly improves the undesirable luminous efficiency of Mn<sup>2+</sup>. The energy transfer between Eu<sup>2+</sup> and Mn<sup>2+</sup> significantly boosts both internal quantum efficiency (IQE) and external quantum efficiency (EQE) of the phosphor, achieving values of 72.5% and 42.6%, respectively. Additionally, the phosphor demonstrates exceptional thermal stability, at 150 °C, maintaining 71.49% of its initial emission intensity. The emission spectrum of the phosphor closely matches the chlorophyll's absorption spectra, with similarities of 75.06% and 94.52%, respectively. This was further confirmed through a fabricated LED with a n-UV chip (395 nm). To further assess the potential for agritech applications, a light-conversion film incorporating the developed phosphor in PDMS glue was prepared. An outdoor cultivation trial with <em>Chlorella</em> showed that the algae's growth rate improves by 27.3% relative to a control group. These results reveal the significant potential of the Na<sub>3</sub>KMg<sub>7</sub>(PO<sub>4</sub>)<sub>6</sub>: Eu<sup>2+</sup>, Mn<sup>2+</sup> phosphor for enhancing plant growth in practical applications.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 10","pages":"Pages 2117-2127"},"PeriodicalIF":7.2,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145157049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Increasing heat resistance of a Mg-Sm-Zn alloy via minor gadolinium addition 添加少量钆提高Mg-Sm-Zn合金的耐热性
IF 5.2 1区 化学
Journal of Rare Earths Pub Date : 2024-09-11 DOI: 10.1016/j.jre.2024.09.011
Deping Zhang , Wenxin Hu , Liren Cheng , Boqiong Li , Chenbin Zhang
{"title":"Increasing heat resistance of a Mg-Sm-Zn alloy via minor gadolinium addition","authors":"Deping Zhang ,&nbsp;Wenxin Hu ,&nbsp;Liren Cheng ,&nbsp;Boqiong Li ,&nbsp;Chenbin Zhang","doi":"10.1016/j.jre.2024.09.011","DOIUrl":"10.1016/j.jre.2024.09.011","url":null,"abstract":"<div><div>The addition of minor gadolinium (Gd) into Mg-4Sm-0.6Zn-0.4Zr alloy significantly enhances high-temperature strength and creep resistance, such as a decrease in the minimum creep rate by approximately five times and an increase in the yield strength by around 40 MPa at 200 °C. The presence of Gd results in the co-precipitation of both prismatic <em>β</em>-type and basal <em>γ</em>-type phases during creep, whereas only the basal <em>γ</em>-type phase is present in the Gd-free alloy. The prismatic <em>β</em>-type and basal <em>γ</em>-type phases are oriented perpendicular to each other in space, creating a closed configuration that effectively blocks dislocation motions compared to single basal <em>γ</em>-type precipitates. Therefore, the improved creep resistance in the Gd-enriched alloy is mainly attributed to the co-precipitation of prismatic <em>β</em>-type and <em>γ</em>-type precipitates during creep. Furthermore, rare earth (RE) atoms inherently provide stable solute hardening at high temperatures, which contributes to the increased high-temperature strength. The addition of Gd also enhances grain boundary stability by promoting the formation of more Mg<sub>3</sub>RE phases, thereby further enhancing the creep strength. These findings offer insights into the development of highly creep-resistant Mg alloys with low RE concentrations.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 3","pages":"Pages 612-619"},"PeriodicalIF":5.2,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of titanium addition on microstructures and magnetic properties of B-lean Nd-Fe-B sintered magnets 添加钛对硼贫Nd-Fe-B烧结磁体组织和磁性能的影响
IF 7.2 1区 化学
Journal of Rare Earths Pub Date : 2024-09-07 DOI: 10.1016/j.jre.2024.08.015
Qingfang Huang , Qingzheng Jiang , Kexiang Zhong , Renhui Liu , Dawei Shi , Gang Fu , Yongjian Zhang , Deqin Xu , Dakun Chen , Zhenchen Zhong
{"title":"Effect of titanium addition on microstructures and magnetic properties of B-lean Nd-Fe-B sintered magnets","authors":"Qingfang Huang ,&nbsp;Qingzheng Jiang ,&nbsp;Kexiang Zhong ,&nbsp;Renhui Liu ,&nbsp;Dawei Shi ,&nbsp;Gang Fu ,&nbsp;Yongjian Zhang ,&nbsp;Deqin Xu ,&nbsp;Dakun Chen ,&nbsp;Zhenchen Zhong","doi":"10.1016/j.jre.2024.08.015","DOIUrl":"10.1016/j.jre.2024.08.015","url":null,"abstract":"<div><div>The effect of Ti addition on microstructures and magnetic properties of B-lean (Pr,Nd)<sub>31.1</sub>Fe<sub>67.1–<em>x</em></sub>(CoCuGa)<sub>1.4</sub>Ti<sub><em>x</em></sub>B<sub>0.9</sub> (wt%, <em>x</em> = 0.0, 0.1, 0.2, 0.3, 0.4) sintered magnets were investigated. The remanence <em>B</em><sub>r</sub> is slightly reduced due to the deteriorated orientation degree and the diminished volume fraction of main phase caused by the existence of rod-shaped Ti-B-rich phase. However, the <em>H</em><sub>cJ</sub> obviously increases from 1145 kA/m for <em>x</em> = 0.0 sample to 1515 kA/m for <em>x</em> = 0.2 sample. The results demonstrate that the increments of coercivity for <em>x</em> = 0.2 and <em>x</em> = 0.0 samples after post-sinter annealing (PSA) are 62.9% and 20.6%, respectively. Rod-shaped Ti-B-rich phase forms after Ti doping, which leads to the existence of 6:13:1 type RE-Fe-(Cu,Ga) phase with high Fe content at triple junctions. This is beneficial to the formation of continuous thin grain boundaries with low Fe content, which can weaken the exchange coupling interaction between adjacent grains, leading to the improved coercivity.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"43 10","pages":"Pages 2204-2211"},"PeriodicalIF":7.2,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145157532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Unveiling mechanical response and deformation mechanism of extruded WE43 magnesium alloy under high-speed impact 揭示挤压成型的 WE43 镁合金在高速冲击下的机械响应和变形机理
IF 5.2 1区 化学
Journal of Rare Earths Pub Date : 2024-09-07 DOI: 10.1016/j.jre.2024.09.009
Pengcheng Guo , Tuo Ye , Yuanzhi Wu , Shawei Qiu , Erli Xia , Xianlan Liu , Luoxing Li
{"title":"Unveiling mechanical response and deformation mechanism of extruded WE43 magnesium alloy under high-speed impact","authors":"Pengcheng Guo ,&nbsp;Tuo Ye ,&nbsp;Yuanzhi Wu ,&nbsp;Shawei Qiu ,&nbsp;Erli Xia ,&nbsp;Xianlan Liu ,&nbsp;Luoxing Li","doi":"10.1016/j.jre.2024.09.009","DOIUrl":"10.1016/j.jre.2024.09.009","url":null,"abstract":"<div><div>To clarify the mechanical behavior and deformation mechanism of rare earth magnesium (Mg) alloy WE43 under extreme service loads, high-speed impact tests under various deformation temperatures and loading paths were conducted using a split Hopkinson pressure bar. The flow stress along extrusion direction (ED) and extrusion radial direction (ERD) decreases apparently with deformation temperature. Compared with conventional Mg alloys, it exhibits a slight anisotropy and an unusual C-shaped characteristic. Cellular dislocation, mechanical twin and fine grain that occur after high-speed impact deformation are insensitive to the loading direction, but strongly dependent on the deformation temperature, especially superimposed with adiabatic temperature rise. As a result, dynamic recrystallization (DRX) occurs even at an ambient temperature of 25 °C. Double twinning and prismatic slip or pyramidal slip are the dominant deformation mechanisms at 25 °C. These twins induce mechanical cutting refinement to form some fine-grained structures, accompanied by a small number of fine grains by twinning induced DRX. In contrast, the deformation at 250 °C is mainly controlled by prismatic slip and pyramidal slip, accompanied by various types of twinning in early deformation stage. Compared with 25 °C, more fine-grained microstructures are formed at 150 and 250 °C through a synergy mechanism of twinning induced mechanical cutting and twinning induced DRX.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"42 12","pages":"Pages 2303-2315"},"PeriodicalIF":5.2,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142719708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of lanthanum oxide on microstructure and mechanical properties of ZK60 magnesium alloy 氧化镧对 ZK60 镁合金微观结构和机械性能的影响
IF 5.2 1区 化学
Journal of Rare Earths Pub Date : 2024-09-07 DOI: 10.1016/j.jre.2024.09.002
Wei Qiu , Zhaoyuan Lu , Senmao Zhang , Shuanglong Li , Jian Chen , Wei Chen , Wei Li , Yanjie Ren , Jun Luo , Maohai Yao , Wen Xie
{"title":"Effect of lanthanum oxide on microstructure and mechanical properties of ZK60 magnesium alloy","authors":"Wei Qiu ,&nbsp;Zhaoyuan Lu ,&nbsp;Senmao Zhang ,&nbsp;Shuanglong Li ,&nbsp;Jian Chen ,&nbsp;Wei Chen ,&nbsp;Wei Li ,&nbsp;Yanjie Ren ,&nbsp;Jun Luo ,&nbsp;Maohai Yao ,&nbsp;Wen Xie","doi":"10.1016/j.jre.2024.09.002","DOIUrl":"10.1016/j.jre.2024.09.002","url":null,"abstract":"<div><div>Different amounts of La<sub>2</sub>O<sub>3</sub> were added to ZK60 alloy to observe the changes in microstructure and mechanical properties of ZK60-<em>X</em>La<sub>2</sub>O<sub>3</sub> (<em>X</em> = 0, 0.2 wt%, 0.5 wt%) composites. Our findings reveal that within the as-cast ZK60 alloy, the Mg-Zn binary phase is manifested as rod-shaped precipitates, exhibiting a dispersed distribution predominantly along the grain boundary regions. With the increase of La<sub>2</sub>O<sub>3</sub> addition, the rod-like Mg-Zn binary phases are gradually replaced by Mg-Zn-La ternary phases, and these Mg-Zn-La ternary phases are semi-continuously distributed around the grain boundaries. Both ZK602 and ZK605 alloys result in a corresponding improvement in ductility after extrusion. It is noteworthy that the ductility of the as-extruded ZK605 alloy is increased by 59.4% compared to ZK60 at the expense of a reduction of only 3.9% in yield strength. Taken together, the significant increase in ductility of ZK605 is mainly due to the weakening of the basal texture, which is weakened by the redox reaction of La<sub>2</sub>O<sub>3</sub> with the α-Mg matrix, generating the La element. The decrease in yield strength of ZK605 in the extruded state is closely related to the observed grain coarsening phenomenon and the basal texture weakening. At the same time, the ultimate tensile strength of ZK605 shows a slight increase, which is mainly due to the second phase strengthening. The Mg-Zn-La ternary phase exhibits a notably hard character, and it is evident that the distribution of this phase becomes progressively denser as the La<sub>2</sub>O<sub>3</sub> content increases.</div></div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"42 12","pages":"Pages 2270-2278"},"PeriodicalIF":5.2,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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