Rare Metals最新文献

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Microstructure evolution and coercivity enhancement mechanisms of Ga-doped Nd–Ce–Fe–B sintered magnets upon post-sinter annealing
IF 9.6 1区 材料科学
Rare Metals Pub Date : 2025-01-23 DOI: 10.1007/s12598-024-03095-9
Rong-Shun Lai, Qiang Ma, Hai-Bo Xu, Yang-Yang Zhang, Zhi-Bin Li, Bao-Gen Shen
{"title":"Microstructure evolution and coercivity enhancement mechanisms of Ga-doped Nd–Ce–Fe–B sintered magnets upon post-sinter annealing","authors":"Rong-Shun Lai,&nbsp;Qiang Ma,&nbsp;Hai-Bo Xu,&nbsp;Yang-Yang Zhang,&nbsp;Zhi-Bin Li,&nbsp;Bao-Gen Shen","doi":"10.1007/s12598-024-03095-9","DOIUrl":"10.1007/s12598-024-03095-9","url":null,"abstract":"<div><p>The low coercivity is the major factor inhibiting the large-scale commercial utilization of Nd–Ce–Fe–B sintered magnets. In this work, we achieved a record-high coercivity of 15.04 kOe in Ga-doped Nd–Ce–Fe–B sintered magnets with 30 wt% Ce replacing Nd, demonstrating enormous potential. The Ga-doped Nd–Ce–Fe–B magnets with higher boron (HB) and lower boron (LB) content are designed. The coercivity of the HB magnet increases slightly from 10.80 to 12.26 kOe after annealing, attributed to the optimized distribution of grain boundary (GB) phases. In contrast, the coercivity of the LB magnet remarkably increases from 8.13 to 15.04 kOe after annealing. Microstructural observations indicate that the narrow GB phase in the as-sintered magnet is rich in Fe, and the strong exchange coupling of adjacent grains resulted in low coercivity. The evolution of Ga-rich phases reveals a potential formation mechanism of the RE<sub>6</sub>Fe<sub>13</sub>Ga phase, that is the RE-Fe amorphous phase and REGa phase in the as-sintered magnet combine to form the RE<sub>6</sub>Fe<sub>13</sub>Ga phase and RE-Ga amorphous phase during post-sinter annealing (RE: rare earth). Moreover, the GB phase of the annealed magnet transforms into a Fe-lean phase with a thickness of 16.4 nm. Magnetization and demagnetization behavior characterizations reveal that the exchange decoupling of adjacent grains induced by the optimized GB phases is the main reason for the remarkable coercivity enhancement, which is also validated by micromagnetic simulations.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 4","pages":"2629 - 2643"},"PeriodicalIF":9.6,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143786375","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}
引用次数: 0
Raman scattering of two-dimensional MoO2 flakes at high pressure
IF 9.6 1区 材料科学
Rare Metals Pub Date : 2025-01-23 DOI: 10.1007/s12598-024-03074-0
Qian Liu, Jing-Yi Liu, Bo-Jian Zhou, Jia-Geng Liu, Qi-Ye Liu, Ying Liu, Yu-Qing Zhao, Shao-Long Jiang
{"title":"Raman scattering of two-dimensional MoO2 flakes at high pressure","authors":"Qian Liu,&nbsp;Jing-Yi Liu,&nbsp;Bo-Jian Zhou,&nbsp;Jia-Geng Liu,&nbsp;Qi-Ye Liu,&nbsp;Ying Liu,&nbsp;Yu-Qing Zhao,&nbsp;Shao-Long Jiang","doi":"10.1007/s12598-024-03074-0","DOIUrl":"10.1007/s12598-024-03074-0","url":null,"abstract":"","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 4","pages":"2830 - 2835"},"PeriodicalIF":9.6,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143786426","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}
引用次数: 0
In-depth understanding of the band alignment and interface states scenario in Bi2O2Se/SrTiO3 ultrathin heterojunction 深入了解 Bi2O2Se/SrTiO3 超薄异质结中的带排列和界面态情况
IF 9.6 1区 材料科学
Rare Metals Pub Date : 2025-01-21 DOI: 10.1007/s12598-024-03062-4
Ke Zhang, Yu-Sen Feng, Lei Hao, Jing Mi, Miao Du, Ming-Hui Xu, Yan Zhao, Jian-Ping Meng, Liang Qiao
{"title":"In-depth understanding of the band alignment and interface states scenario in Bi2O2Se/SrTiO3 ultrathin heterojunction","authors":"Ke Zhang,&nbsp;Yu-Sen Feng,&nbsp;Lei Hao,&nbsp;Jing Mi,&nbsp;Miao Du,&nbsp;Ming-Hui Xu,&nbsp;Yan Zhao,&nbsp;Jian-Ping Meng,&nbsp;Liang Qiao","doi":"10.1007/s12598-024-03062-4","DOIUrl":"10.1007/s12598-024-03062-4","url":null,"abstract":"<p>Bismuth oxyselenide (Bi<sub>2</sub>O<sub>2</sub>Se), a novel quasi-two-dimensional charge-carrying semiconductor, is recognized as one of the most promising emerging platforms for next-generation semiconductor devices. Recent advancements in the development of diverse Bi<sub>2</sub>O<sub>2</sub>Se heterojunctions have unveiled extensive potential applications in both electronics and optoelectronics. However, achieving an in-depth understanding of band alignment and particularly interface dynamics remains a significant challenge. In this study, we conduct a comprehensive experimental investigation into band alignment utilizing high-resolution X-ray photoelectron spectroscopy (HRXPS), while also thoroughly discussing the properties of interface states. Our findings reveal that ultrathin films of Bi<sub>2</sub>O<sub>2</sub>Se grown on SrTiO<sub>3</sub> (with TiO<sub>2</sub> (001) termination) exhibit Type-I (straddling gap) band alignment characterized by a valence band offset (VBO) of approximately 1.77 ± 0.04 eV and a conduction band offset (CBO) around 0.68 ± 0.04 eV. Notably, when accounting for the influence of interface states, the bands at the interface display a herringbone configuration due to substantial built-in electric fields, which markedly deviate from conventional band alignments. Thus, our results provide valuable insights for advancing high-efficiency electronic and optoelectronic devices, particularly those where charge transfer is highly sensitive to interface states.</p>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 2","pages":"1204 - 1212"},"PeriodicalIF":9.6,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143481115","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}
引用次数: 0
Heterojunction structure of LiV3O8-LiV6O15 cathode material with multiple electron reactions
IF 9.6 1区 材料科学
Rare Metals Pub Date : 2025-01-21 DOI: 10.1007/s12598-024-03121-w
Ying-Hao Zhao, Zhi-Qiang Dai, Cheng-Wu Yang, Dong Xu, Jin Zhao, Shuang-Hong Chen, Jin Yi, Yong-Peng Lei, Xin-Yu Zhang, Jia-Qian Qin
{"title":"Heterojunction structure of LiV3O8-LiV6O15 cathode material with multiple electron reactions","authors":"Ying-Hao Zhao,&nbsp;Zhi-Qiang Dai,&nbsp;Cheng-Wu Yang,&nbsp;Dong Xu,&nbsp;Jin Zhao,&nbsp;Shuang-Hong Chen,&nbsp;Jin Yi,&nbsp;Yong-Peng Lei,&nbsp;Xin-Yu Zhang,&nbsp;Jia-Qian Qin","doi":"10.1007/s12598-024-03121-w","DOIUrl":"10.1007/s12598-024-03121-w","url":null,"abstract":"","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 4","pages":"2815 - 2821"},"PeriodicalIF":9.6,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143786569","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}
引用次数: 0
Ultra-wide band electromagnetic wave absorption by decorating the magnetic particles on two-dimensional Ti3C2Tx
IF 9.6 1区 材料科学
Rare Metals Pub Date : 2025-01-21 DOI: 10.1007/s12598-024-03170-1
Tong hui Li, Lin Ma, Li Wang, Hai bo Wang, Bo Li, Meng yao Han, Diao feng Li, Chun guang Bai, Ming dong Dong, Long hai Shen, Song Ma, Feng Qi
{"title":"Ultra-wide band electromagnetic wave absorption by decorating the magnetic particles on two-dimensional Ti3C2Tx","authors":"Tong hui Li,&nbsp;Lin Ma,&nbsp;Li Wang,&nbsp;Hai bo Wang,&nbsp;Bo Li,&nbsp;Meng yao Han,&nbsp;Diao feng Li,&nbsp;Chun guang Bai,&nbsp;Ming dong Dong,&nbsp;Long hai Shen,&nbsp;Song Ma,&nbsp;Feng Qi","doi":"10.1007/s12598-024-03170-1","DOIUrl":"10.1007/s12598-024-03170-1","url":null,"abstract":"<div><p>The single-layer Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>/MXene has become a special electromagnetic wave absorber near the terahertz band because of its abundant surface groups and excellent conductivity. However, the macro-preparation of single-layer Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>/MXene shows significantly difficult to influence its application. The two-dimensional Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> is easily prepared to have high production, but its weak absorption ability due to high surface conductivity also restricts its application. To realize the strong electromagnetic wave absorption of two-dimensional Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>/MXene, a new strategy with magnetic FeNi nanoparticles decorating Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>/MXene composites (FeNi-Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub>) were proposed and the effective electromagnetic wave absorption features covering 170–220 GHz that means the absorption band width reach 50 GHz. With an absorber composite film thickness being only 0.6 mm, the absorptivity of the composite is enhanced with the increase of decorating FeNi nanoparticles and promote up to 75% when the FeNi nanoparticles loading content reaches 30 wt%. The improvement of absorption is attributed to the introduction of soft magnetic FeNi to adjust the high surface conductivity of MXene and improve the electromagnetic balance of the absorber.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 3","pages":"1844 - 1855"},"PeriodicalIF":9.6,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143667969","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}
引用次数: 0
Defect engineering boosts microwave absorption in TaxNb1-xC nanowires
IF 9.6 1区 材料科学
Rare Metals Pub Date : 2025-01-21 DOI: 10.1007/s12598-024-03087-9
Lan-Chao Wen, Li Guan, Jia-Xin Zhang, Yu-Jie Zhu, Peng Chen, Jia-Lu Suo, Biao Zhao, Rui Zhang
{"title":"Defect engineering boosts microwave absorption in TaxNb1-xC nanowires","authors":"Lan-Chao Wen,&nbsp;Li Guan,&nbsp;Jia-Xin Zhang,&nbsp;Yu-Jie Zhu,&nbsp;Peng Chen,&nbsp;Jia-Lu Suo,&nbsp;Biao Zhao,&nbsp;Rui Zhang","doi":"10.1007/s12598-024-03087-9","DOIUrl":"10.1007/s12598-024-03087-9","url":null,"abstract":"<div><p>The solid solution formed by the combination of multiple cations has been extensively investigated due to its distinctive lattice distortion effect, which imparts unique electromagnetic properties. In particular, the regulation of dielectric and magnetic properties can be achieved through element selection. Herein, the stability of Ta<sub><i>x</i></sub>Nb<sub>1-<i>x</i></sub>C was predicted through geometric optimization of crystal structure, and Ta<sub><i>x</i></sub>Nb<sub>1-<i>x</i></sub>C nanowires were successfully synthesized through F-ion-assisted carbothermal reduction method. The introduction of bimetallic ions forms significant carbon defects and lattice distortion, which undoubtedly induces the formation of strong interface polarization and defect polarization, resulting in high dielectric loss. Furthermore, the significant presence of imperfections leads to a decrease in both the dielectric constant and conductivity, thereby achieving impedance balance. The design of a one-dimensional structure also facilitates the formation of conductive pathways, promoting carrier transitions. Benefiting from a variety of loss mechanisms and appropriate impedance matching, solid solution Ta<sub><i>x</i></sub>Nb<sub>1-<i>x</i></sub>C shows excellent electromagnetic wave absorption (EWA) performance. This research presents a promising strategy for developing single-phase materials with excellent EWA performance.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 4","pages":"2577 - 2588"},"PeriodicalIF":9.6,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143786570","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}
引用次数: 0
Enhanced stability of perovskite cathode via entropy engineering for CO2 electrolysis
IF 9.6 1区 材料科学
Rare Metals Pub Date : 2025-01-20 DOI: 10.1007/s12598-024-03119-4
Nan Zhang, Wen-Yu Zhang, Yan-Sheng Gong, Rui Wang, Huan-Wen Wang, Jun Jin, Ling Zhao, Bei-Bei He
{"title":"Enhanced stability of perovskite cathode via entropy engineering for CO2 electrolysis","authors":"Nan Zhang,&nbsp;Wen-Yu Zhang,&nbsp;Yan-Sheng Gong,&nbsp;Rui Wang,&nbsp;Huan-Wen Wang,&nbsp;Jun Jin,&nbsp;Ling Zhao,&nbsp;Bei-Bei He","doi":"10.1007/s12598-024-03119-4","DOIUrl":"10.1007/s12598-024-03119-4","url":null,"abstract":"<div><p>The performance of solid oxide electrolysis cells (SOECs) for CO<sub>2</sub> electrolysis is significantly impeded by the limited electrochemical activity and insufficient durability of the cathode. This study introduces a novel (LaSrPrBaCaGd)<sub>2</sub>Fe<sub>1.5</sub>Mo<sub>0.5</sub>O<sub>6-<i>δ</i></sub> (LSPBCGFM) perovskite via A-site entropy engineering, to improve both activity and durability. Experimental results reveal that LSPBCGFM cathode-based SOEC achieves a current density of 1.34 A·cm<sup>−2</sup> at 1.5 V and 800 °C, maintaining stable operation for more than 400 h at 1.2 V with negligible degradation. Theoretical calculations suggest that the high-entropy strategy shifts the transition metal d-band center and O-2p-band center closer to the Fermi energy level simultaneously, thereby initiating more favorable CO<sub>2</sub> adsorption and activation. In addition, a higher O-2p-band center promotes the formation and diffusion of oxygen vacancies. The findings of this study provide crucial insights into the role of conformational entropy strategies in CO<sub>2</sub> electrolysis and offer potential pathways for the development of highly efficient and stable catalysts.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 4","pages":"2416 - 2427"},"PeriodicalIF":9.6,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143786564","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}
引用次数: 0
Solvent-induced conformation gating of single-molecule charge transport in valinomycin and valinomycin-K+ junctions
IF 9.6 1区 材料科学
Rare Metals Pub Date : 2025-01-20 DOI: 10.1007/s12598-024-03123-8
Xia Long, Xiao-Chi Liu, Yan-Yi Yang, Jia-Qing Dai, Jue-Xian Cao, Yong Hu
{"title":"Solvent-induced conformation gating of single-molecule charge transport in valinomycin and valinomycin-K+ junctions","authors":"Xia Long,&nbsp;Xiao-Chi Liu,&nbsp;Yan-Yi Yang,&nbsp;Jia-Qing Dai,&nbsp;Jue-Xian Cao,&nbsp;Yong Hu","doi":"10.1007/s12598-024-03123-8","DOIUrl":"10.1007/s12598-024-03123-8","url":null,"abstract":"<div><p>Gaining insights into charge transport related to conformational changes and ion transport in valinomycin (VM) is crucial for understanding the underlying physiological processes and advancing ion carrier applications. Observing these processes in single molecules provides deeper insights and precision than those obtained through conventional ensemble measurements. Herein, we employed a single-molecule conductance measurement method based on the scanning tunneling microscopy break-junction (STM-BJ) to measure the charge transport of individual VM molecules in both non-polar and polar solvents, as well as when mediated by K<sup>+</sup> ions. Single-molecule conductance measurements revealed that the bracelet and propeller-type conformations of VM in both non-polar and polar solvents significantly affect its conductance. In polar solvents, the propeller-type conformation of VM demonstrated a well-defined conductance signature, single-molecule rectification feature, and through-space transmission mechanism. Specifically, the introduction of K<sup>+</sup> ions in polar solvents induced a conformational transition from the propeller-type to the bracelet-type form, facilitating K<sup>+</sup> binding recognition. These observations were further supported by density functional theory combined with non-equilibrium Green’s function calculations. This study enhanced the fundamental understanding of the electronic transport mechanisms in VM and valinomycin-K<sup>+</sup> molecular junctions, offering insights into VM ionophores and promoting supramolecular sensing applications.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 4","pages":"2522 - 2533"},"PeriodicalIF":9.6,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143786565","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}
引用次数: 0
Flow stress softening and deformation mechanism under competition of current density and strain rate in basket structured high-entropy alloy
IF 9.6 1区 材料科学
Rare Metals Pub Date : 2025-01-20 DOI: 10.1007/s12598-024-03099-5
Hu-Shan Li, Chao-Gang Ding, Hao Zhang, Jing-Yi Wang, Yu-Xi Chen, Zhi-Qin Yang, Jie Xu, Bin Guo, De-Bin Shan, Terence G. Langdon
{"title":"Flow stress softening and deformation mechanism under competition of current density and strain rate in basket structured high-entropy alloy","authors":"Hu-Shan Li,&nbsp;Chao-Gang Ding,&nbsp;Hao Zhang,&nbsp;Jing-Yi Wang,&nbsp;Yu-Xi Chen,&nbsp;Zhi-Qin Yang,&nbsp;Jie Xu,&nbsp;Bin Guo,&nbsp;De-Bin Shan,&nbsp;Terence G. Langdon","doi":"10.1007/s12598-024-03099-5","DOIUrl":"10.1007/s12598-024-03099-5","url":null,"abstract":"<div><p>Electrically assisted forming (EAF) is a reliable method of reducing the deformation resistance of metallic materials and enhancing their formability. In this study, the mechanical properties and microstructure of Al<sub>0.5</sub>CoCrFeNi high-entropy alloy (HEA) under electrically assisted compression (EAC) were investigated. The results showed that the flow stress decreased with increasing current density in the EAC. Specifically, the flow curves exhibited S-shaped softening at a higher current density, which was dominated by the non-uniform distribution of the Joule heating temperature during EAC. When the flow stress was fixed at 500 MPa and 80 A·mm<sup>−2</sup>, compressible deformation amounts of 63.7% were observed at a strain rate of 1 s<sup>−1</sup>, indicating full compression of Al<sub>0.5</sub>CoCrFeNi HEA at low-stress levels. Based on the microstructure, the flowability of Al<sub>0.5</sub>CoCrFeNi HEA was improved during EAC, and the flow direction shifted from 45°to the horizontal direction. The current density, which influences the Joule heating temperature and strain rate, synergistically affects the stacking fault energy (SFE) and critical resolved shear stress (CRSS), which affect the tendency for twinning behavior. Thererfore, deformation nanoscale twins (DTs) were observed, indicating a shift in the deformation mechanisms from dislocation slip domination to a mixed pattern of dislocation slip and twinning. This study confirmed the deformability of Al<sub>0.5</sub>CoCrFeNi HEA during EAC and provided an experimental foundation and theoretical support for the formation of HEAs.</p><h3>Graphic Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 4","pages":"2705 - 2719"},"PeriodicalIF":9.6,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143786566","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}
引用次数: 0
Mechanical properties and deformation mechanism of lightweight Al0.5NbTi3VZr0.5 high-entropy alloy via laser surface melting process
IF 9.6 1区 材料科学
Rare Metals Pub Date : 2025-01-18 DOI: 10.1007/s12598-024-03143-4
Rui Liu, Hong-Wei Yan, Xi-Wu Li, Yong-An Zhang, Zhi-Hui Li, Bai-Qing Xiong
{"title":"Mechanical properties and deformation mechanism of lightweight Al0.5NbTi3VZr0.5 high-entropy alloy via laser surface melting process","authors":"Rui Liu,&nbsp;Hong-Wei Yan,&nbsp;Xi-Wu Li,&nbsp;Yong-An Zhang,&nbsp;Zhi-Hui Li,&nbsp;Bai-Qing Xiong","doi":"10.1007/s12598-024-03143-4","DOIUrl":"10.1007/s12598-024-03143-4","url":null,"abstract":"<p>The lightweight refractory high-entropy alloys (LRHEAs) are considered as next-generation high-performance weaponry matrix material. In this work, we employ the laser surface melting (LSM) method to ulteriorly optimize surface mechanical properties of Al<sub>0.5</sub>NbTi<sub>3</sub>VZr<sub>0.5</sub> matrix HEA, where the phase structures, mechanical properties and deformation mechanism of as-cast and LSM-treated HEAs have been investigated. The LSM process eliminates tanglesome intermetallic Zr<sub>5</sub>Al<sub>3</sub> structures and effectively improves the mechanical properties of as-cast HEA. The sample after 2000 W LSM treatment exhibits the superior comprehensive mechanical properties, its tensile elongation, microhardness of remelt zone and volume wear loss are 31.6%, HV 809.6 and 296.4 × 10<sup>−3</sup> mm<sup>3</sup>, representing the advancement of 85.9%, 180.1% and 64.6% compared to that of as-cast HEA sample, respectively. Additionally, the deformation behavior of the as-cast sample involves solid phase transformation, stacking faults and deformation twinnings. The deformation mechanism of as-cast Al<sub>0.5</sub>NbTi<sub>3</sub>VZr<sub>0.5</sub> HEA is transformation-induced plasticity (TRIP) and twinning-induced plasticity (TWIP), the classical Burgers mechanism of BCC → HCP solid phase transformation is revealed, which obeys [111]<sub>BCC</sub> <i>∥</i> [1120]<sub>HCP</sub>. As for the 2000 W treated sample, the deformation mechanism is mainly TWIP as the stacking fault energy enhancement evidenced by the presence of cross-slip dislocations after LSM process.</p>","PeriodicalId":749,"journal":{"name":"Rare Metals","volume":"44 4","pages":"2735 - 2747"},"PeriodicalIF":9.6,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143786612","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}
引用次数: 0
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