Journal of Rare Earths最新文献

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 , Zhongjie Li , Chao Liu , Qiuming Peng , Weili Cheng , Huashun Yu , Kwang Seon Shin , 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 Mg85Zn6Y9 (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

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 , Tuo Ye , Yuanzhi Wu , Shawei Qiu , Erli Xia , Xianlan Liu , 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 , Zhaoyuan Lu , Senmao Zhang , Shuanglong Li , Jian Chen , Wei Chen , Wei Li , Yanjie Ren , Jun Luo , Maohai Yao , 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 La2O3 were added to ZK60 alloy to observe the changes in microstructure and mechanical properties of ZK60-XLa2O3 (X = 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 La2O3 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 La2O3 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 La2O3 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}

引用次数: 0

Twinning behavior of an extruded Mg-Gd-Y-Zn-Zr alloy sheet under tension and compression 挤压成型的 Mg-Gd-Y-Zn-Zr 合金板材在拉伸和压缩条件下的孪晶行为

IF 5.2 1区化学

Journal of Rare Earths Pub Date : 2024-09-05 DOI: 10.1016/j.jre.2024.08.020

Jianfen Huang , Tao Chen , Wugui Jiang , Longhui Mao , Zhiyong Chen

引用次数: 0

High-performance anisotropic SmCo-based magnet with novel microstructure 具有新型微观结构的高性能各向异性SmCo基磁体

IF 5.2 1区化学

Journal of Rare Earths Pub Date : 2024-08-01 DOI: 10.1016/j.jre.2023.08.006

引用次数: 0

Crystal structure and luminescence dynamics of highly pure LiM(PO3)3:Eu3+ (M = Sr, Ca) red phosphors for white light emitting diodes 白光二极管用高纯LiM（PO3）3:Eu3+（M=Sr，Ca）红色荧光粉的晶体结构和发光动力学

IF 5.2 1区化学

Journal of Rare Earths Pub Date : 2024-08-01 DOI: 10.1016/j.jre.2023.08.016

{"title":"Crystal structure and luminescence dynamics of highly pure LiM(PO3)3:Eu3+ (M = Sr, Ca) red phosphors for white light emitting diodes","authors":"","doi":"10.1016/j.jre.2023.08.016","DOIUrl":"10.1016/j.jre.2023.08.016","url":null,"abstract":"<div>Highly pure red phosphors LiM(PO3)3:Eu3+ (M = Sr, Ca) doped with Eu3+ (1 mol%) were synthesized via solution combustion method and their crystal structure and luminescence dynamics were studied to explore its suitability in white light emitting diodes. The Rietveld refinement analysis of the powder X-ray diffraction patterns reveals that the phosphors belong to the pure triclinic phase of LiSr(PO3)3 and LiCa(PO3) with space group P-<math><mrow><mover><mn>1</mn><mo>¯</mo></mover></mrow></math> (2). The scanning electron microscopy images showed the agglomerated morphology. The photoluminescence emission spectra under 393 nm show an orange band at 594 nm and a red band at 613 nm ascribed to 5D0 → 7F1, 5D0 → 7F2 transitions of Eu3+ ion in both the phosphors. Moreover, the spectroscopic properties such as luminescence behaviour, and Stark splitting were used to examine the symmetry of Eu3+ ions in LiM(PO3)3:Eu3+ (M = Sr, Ca) phosphors in terms of distortion induced upon doping. The Stark splitting shows that the actual site symmetry for Eu3+ ion was estimated to be D2 type for both phosphors. The photometric properties of LiCa(PO3)3:Eu3+ such as Commission International de l’Eclairage coordinates (x = 0.64, y = 0.36) near to the standard one (red), high color purity (95%) and higher brightness reveal that the phosphor has the capability of acting as a red component in n-UV white light emitting diodes.</div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"42 8","pages":"Pages 1470-1478"},"PeriodicalIF":5.2,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41766914","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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Utilizing N-hydroxy-9-octadecenamide as a collector in flotation separation of bastnaesite and fluorite 利用n -羟基-9-十八胺作为捕收剂在氟碳石和萤石浮选分离中的应用

IF 5.2 1区化学

Journal of Rare Earths Pub Date : 2024-08-01 DOI: 10.1016/j.jre.2023.07.001

引用次数: 0

Synthesis, phase transformation and applications of CeCO3OH: A review CeCO3OH的合成、相变及应用综述

IF 5.2 1区化学

Journal of Rare Earths Pub Date : 2024-08-01 DOI: 10.1016/j.jre.2023.09.003

{"title":"Synthesis, phase transformation and applications of CeCO3OH: A review","authors":"","doi":"10.1016/j.jre.2023.09.003","DOIUrl":"10.1016/j.jre.2023.09.003","url":null,"abstract":"<div>CeCO3OH has a unique crystal structure and excellent optical, electronic and catalytic properties, which has been widely investigated for many applications. Interestingly, ceria obtained from CeCO3OH has a morphology that is similar to that of the precursor, and the CeO2-based products obtained from CeCO3OH exhibit outstanding properties, such as catalytic performances, owing to their designed morphology and oxygen vacancies (OVs). To introduce CeCO3OH into a wider range of potential researchers, we first systematically review the physico-chemical properties, synthesis, reaction and morphology tuning mechanism of CeCO3OH, and summarize the conversion behavior from CeCO3OH to ceria. Then, we thoroughly survey the applications of CeCO3OH and its conversion products. Suggestions for further investigations of CeCO3OH are also made in this review. It is hoped that the exhaustive compilation of the valuable properties and considerable potential investigations of CeCO3OH will promote further applications of CeCO3OH and CeO2-based functional materials.</div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"42 8","pages":"Pages 1403-1420"},"PeriodicalIF":5.2,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41277576","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

A dual-mode optical thermometer based on dual-excitation Bi3+,Sm3+ co-doped Y4GeO8 phosphors 基于双激发 Bi3+、Sm3+ 共掺杂 Y4GeO8 荧光粉的双模光学温度计

IF 5.2 1区化学

Journal of Rare Earths Pub Date : 2024-08-01 DOI: 10.1016/j.jre.2023.10.010

{"title":"A dual-mode optical thermometer based on dual-excitation Bi3+,Sm3+ co-doped Y4GeO8 phosphors","authors":"","doi":"10.1016/j.jre.2023.10.010","DOIUrl":"10.1016/j.jre.2023.10.010","url":null,"abstract":"<div>Dual-excitation and dual-emission Y4GeO8:Bi3+,Sm3+ phosphors were manufactured by traditional solid-phase sintering technique. The X-ray diffraction, morphology, photoluminescence, energy transfer process and temperature sensing properties of Y4GeO8:Bi3+,Sm3+ samples were comprehensively evaluated. The Y4GeO8:Bi3+,Sm3+ phosphors exhibit characteristic emissions of Bi3+ (3P1→1S0) and Sm3+ (4G5/2→6H) under both 290 and 347 nm excitations. In fluorescence intensity ratio and Commission International de L'Eclairage coordinates modes, Y4GeO8:Bi3+,Sm3+ samples present excellent temperature measurement performance. The maximum relative sensitivity (Sr-max) values of the former are 1.55%/K (460 K, 290 nm excitation) and 0.82%/K (506 K, 347 nm excitation). The Sr-max(x) values of the latter are 0.21%/K (437 K, 290 nm excitation) and 0.15%/K (513 K, 347 nm excitation). These results illustrate that Y4GeO8:Bi3+,Sm3+ phosphors can be used as a candidate material for a dual-mode optical thermometer under dual-excitation.</div>","PeriodicalId":16940,"journal":{"name":"Journal of Rare Earths","volume":"42 8","pages":"Pages 1437-1446"},"PeriodicalIF":5.2,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135849409","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 MgPm2X4 (X = S, Se) spinel chalcogenides for spintronic and thermoelectric applications 用于自旋电子和热电应用的稀土基 MgPm2X4（X = S、Se）尖晶石铬化物

IF 5.2 1区化学

Journal of Rare Earths Pub Date : 2024-08-01 DOI: 10.1016/j.jre.2023.10.001

引用次数: 0