Materials Letters最新文献_第5页

Study on the microstructure and properties of co-free high-entropy alloys fabricated by laser melting deposition and processed by hot isostatic pressing 激光熔化沉积和热等静压加工无共高熵合金的组织和性能研究

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-06-20 DOI: 10.1016/j.matlet.2025.138972

Xitong Guan , Xvteng Lv , Songtao Ji , Zhijie Han , Junhui Diao , Yongguang Gao , Qi Wu

{"title":"Study on the microstructure and properties of co-free high-entropy alloys fabricated by laser melting deposition and processed by hot isostatic pressing","authors":"Xitong Guan , Xvteng Lv , Songtao Ji , Zhijie Han , Junhui Diao , Yongguang Gao , Qi Wu","doi":"10.1016/j.matlet.2025.138972","DOIUrl":"10.1016/j.matlet.2025.138972","url":null,"abstract":"<div><div>In this study, laser melting deposition (LMD) was employed to fabricate Fe36Mn21Cr18Ni15Al10 high-entropy alloy (HEA), followed by hot isostatic pressing (HIP) treatment to optimize the microstructure and enhance ductility. The microstructural characteristics, phase composition, and mechanical properties of both as-deposited and as-HIPed HEAs were systematically investigated. The as-deposited specimen exhibited a BCC + B2 dual-phase structure with cellular microstructures, demonstrating a yield strength of 623.1 MPa, ultimate tensile strength of 671.2 MPa, and elongation of 3.82 %. After HIP treatment, the alloy transformed into an FCC + BCC(B2) dual-phase structure, achieving improved mechanical properties with yield strength of 600.5 MPa, ultimate tensile strength of 800.7 MPa, and significantly enhanced elongation of 20.7 %. This microstructural evolution and corresponding mechanical enhancement confirm the effectiveness of HIP in optimizing LMD-fabricated HEAs.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"398 ","pages":"Article 138972"},"PeriodicalIF":2.7,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144330191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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(Co,CoO)/N-TiO2 as a highly efficient catalyst for oxygen reduction reaction with excellent zinc-air battery performance （Co,CoO）/N-TiO2作为氧还原反应的高效催化剂，具有优异的锌-空气电池性能

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-06-20 DOI: 10.1016/j.matlet.2025.138975

Qi Zhang , Shipeng Wang , Feiyan Zhang , Dongxu Yang , Lifei Qu , Bingxin Liu , Yongcheng Li , Peng Zhang , Yunsi Wang

{"title":"(Co,CoO)/N-TiO2 as a highly efficient catalyst for oxygen reduction reaction with excellent zinc-air battery performance","authors":"Qi Zhang , Shipeng Wang , Feiyan Zhang , Dongxu Yang , Lifei Qu , Bingxin Liu , Yongcheng Li , Peng Zhang , Yunsi Wang","doi":"10.1016/j.matlet.2025.138975","DOIUrl":"10.1016/j.matlet.2025.138975","url":null,"abstract":"<div><div>The development of highly efficient and low-cost non-precious metal oxygen reduction catalysts holds critical significance for advancing the commercialization of metal-air battery and fuel cell. In this work, we perform N-doping and Co-loading on TiO<sub>2</sub> to enhance its ORR performance. The (Co,CoO)<sub>55</sub>/N-TiO<sub>2</sub> catalyst (prepared with 55 mg of Co(CH<sub>3</sub>COO)<sub>2</sub>·4H<sub>2</sub>O) exhibits a half-wave potential (0.865 V versus RHE) comparable to commercial Pt/C, along with significantly enhanced electrocatalytic kinetics. Moreover, when employed in Zinc-air battery, the (Co,CoO)<sub>55</sub>/N-TiO<sub>2</sub> catalyst demonstrates superior performance compared to commercial Pt/C. This performance enhancement originates from the synergistic interplay between Co species and the N-TiO<sub>2</sub> matrix, where N-doping facilitates the formation of both Co–N coordination structures and O–Ti–N bonds. These structural configurations can significantly improve oxygen reduction activity.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"398 ","pages":"Article 138975"},"PeriodicalIF":2.7,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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One-pot synthesis of silver-hydroxyapatite nanocomposites for sunscreens against high-energy visible light radiation 抗高能可见光辐射防晒霜用银-羟基磷灰石纳米复合材料的一锅合成

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-06-20 DOI: 10.1016/j.matlet.2025.138973

Jinutda Engsuwan , Sulawan Kaowphong , Sutinee Girdthep , Nawapong Chumha

引用次数: 0

A high-strength and high-elongation soluble Mg-Gd-Y-Zn-Zr-Cu alloy for fracturing tool fabrication 一种用于压裂工具制造的高强高延伸可溶性Mg-Gd-Y-Zn-Zr-Cu合金

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-06-19 DOI: 10.1016/j.matlet.2025.138962

Jinshuo Tang , Fan Yang , Yunteng Liu , Meifang Wang , Jixue Zhou

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Oriented p-type CuI thin film growth on n-SiC epitaxial layer for ultraviolet light detection 紫外光检测用n-SiC外延层定向p型CuI薄膜的生长

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-06-19 DOI: 10.1016/j.matlet.2025.138967

Xia Yang, Yanfei Lv, Junhua Xi, Li Fu, Fei Chen, Shichao Zhao

引用次数: 0

Synthesis of CoCu bimetal organic frameworks for oxygen reduction reactions 氧还原反应用CoCu双金属有机骨架的合成

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-06-19 DOI: 10.1016/j.matlet.2025.138964

Qianhui Wu , Xiaodian Yan , Zhongzhi Yao , Zhaoyun Wang , Jianin Guo , Bo Yang , Haoyin Wang , Zhijian Liao , Shengkui Zhong , Jiequn Liu

{"title":"Synthesis of CoCu bimetal organic frameworks for oxygen reduction reactions","authors":"Qianhui Wu , Xiaodian Yan , Zhongzhi Yao , Zhaoyun Wang , Jianin Guo , Bo Yang , Haoyin Wang , Zhijian Liao , Shengkui Zhong , Jiequn Liu","doi":"10.1016/j.matlet.2025.138964","DOIUrl":"10.1016/j.matlet.2025.138964","url":null,"abstract":"<div><div>Developing low-cost and high-performance electrocatalysts to enhance the kinetics of the oxygen reduction/evolution reactions (ORR/OER) is crucial for energy devices, such as metal-air batteries. In this study, a pyrolysis-free method was used to prepare a series of CoCu-bimetallic organic Frameworks (CoCu-BMOFs) electrocatalysts via cooparetion of cobalt (Co) and copper (Cu) ions with 1,2,4-triazoles. The optimal Co<sub>6</sub>Cu<sub>4</sub>-BMOFs exhibited inferier ORR and OER activities in half cell comparing to commercial Pt/C + RuO<sub>2</sub>, but the maximum power density of Co<sub>4</sub>Cu<sub>6</sub>-BMOFs (268.35 mW cm<sup>−2</sup>) in Zn-air battery surpassed that of Pt/C + RuO<sub>2</sub> (214.65 mW cm<sup>−2</sup>). Such enhancement could be attributed to the CoCu-tunable ratio in BMOFs, effectively activating the synergistic effects of Co-N<sub>x</sub> and Cu-N<sub>x</sub>, leading to a improved ORR/OER electrocatalytic activity. Our findings regarding the synergistic bimetallic active sites might offer a valuable path for the development of M−N<sub>x</sub> electrocatalysts in pyrolysis-free strategy.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"398 ","pages":"Article 138964"},"PeriodicalIF":2.7,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144322861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 photoluminescence of CdTe/SiO2 quantum dots: Impact of ambient conditions and laser excitation regime on surface trap passivation CdTe/SiO2量子点的增强光致发光：环境条件和激光激发方式对表面阱钝化的影响

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-06-19 DOI: 10.1016/j.matlet.2025.138968

D.S. Daibagya , S.A. Ambrozevich , M.S. Smirnov , O.V. Ovchinnikov , A.V. Osadchenko , I.A. Zakharchuk , A.S. Selyukov

{"title":"Enhanced photoluminescence of CdTe/SiO2 quantum dots: Impact of ambient conditions and laser excitation regime on surface trap passivation","authors":"D.S. Daibagya , S.A. Ambrozevich , M.S. Smirnov , O.V. Ovchinnikov , A.V. Osadchenko , I.A. Zakharchuk , A.S. Selyukov","doi":"10.1016/j.matlet.2025.138968","DOIUrl":"10.1016/j.matlet.2025.138968","url":null,"abstract":"<div><div>We study the photoluminescence properties of CdTe/SiO<sub>2</sub> spherical quantum dots (QDs) under different ambient conditions and excitation regimes. Our findings reveal a significant increase in photoluminescence intensity over time, which we attribute to the adsorption of oxygen and water molecules at QD interfaces resulting in trap passivation. This enhancement is more pronounced under continuous laser excitation compared to periodic on/off excitation, suggesting that continuous excitation facilitates more efficient surface chemistry and trap passivation. The proposed mechanism involving adsorption of oxygen and water is supported by the fact that photoluminescence intensity enhancement at continuous irradiation is smaller at evacuation. Additionally, we observe that the average luminescence lifetime decreases with time at continuous laser irradiation in between the decay measurements, indicating improved electron-hole recombination efficiency due to trap passivation. These insights into the photoluminescence behavior of CdTe/SiO<sub>2</sub> QDs under different ambient conditions and excitation regimes contribute to the understanding of QD photostability and the development of QD-based devices.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"398 ","pages":"Article 138968"},"PeriodicalIF":2.7,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144366007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Friction stir welding parameters for improved joint integrity in dissimilar-thickness Al-Mg-Sc alloys 提高不同厚度Al-Mg-Sc合金接头完整性的搅拌摩擦焊接参数

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-06-19 DOI: 10.1016/j.matlet.2025.138960

Arthur de Bribean Guerra, Guilherme Yuuki Koga, Claudemiro Bolfarini

{"title":"Friction stir welding parameters for improved joint integrity in dissimilar-thickness Al-Mg-Sc alloys","authors":"Arthur de Bribean Guerra, Guilherme Yuuki Koga, Claudemiro Bolfarini","doi":"10.1016/j.matlet.2025.138960","DOIUrl":"10.1016/j.matlet.2025.138960","url":null,"abstract":"<div><div>This study explores the friction stir welding (FSW) of AlMgSc alloys with an emphasis on process parameter optimization and mechanical performance evaluation. A robotic FSW setup equipped with a conical triflat threaded pin was used to join sheets of dissimilar thickness under varying welding conditions. Optimal parameters produced defect-free joints that retained up to 94% of the base material’s yield strength. Microstructural analysis identified oxide agglomeration at the thermo-mechanically affected zone (TMAZ)–nugget interface—particularly on the advancing side—as a key contributor to failure, whereas successful joints exhibited fragmented oxide layers that reduced the risk of brittle fracture. Microhardness mapping revealed asymmetric hardness profiles, indicating strain localization and non-uniform material flow. Fractographic analysis showed mixed-mode fracture mechanisms influenced by oxide distribution and weld zone morphology. These results underscore the importance of oxide control, the potential benefits of asymmetric tool design, and the value of post-weld treatments to improve joint ductility and reliability.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"398 ","pages":"Article 138960"},"PeriodicalIF":2.7,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144364373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Encapsulation of zinc porphyrin within a tetraprismatic molecular cage as efficient light sensitizer and single-site photocatalyst 在四棱镜分子笼内包封卟啉锌作为高效光敏剂和单位点光催化剂

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-06-19 DOI: 10.1016/j.matlet.2025.138971

Xi-Han Li, Chao-Yu Wang, Dong-Jin Qian

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Effect of carboxyl moiety on the electrochromic properties of 1,1′-dibenzyl-4,4′-bipyridinium salt 羧基部分对1,1′-二苯基-4,4′-联吡啶盐电致变色性能的影响

IF 2.7 4区材料科学

Materials Letters Pub Date : 2025-06-19 DOI: 10.1016/j.matlet.2025.138963

Meng Wang, Zhuangzhuang Yang, Lu Lu, Debao Xiao

{"title":"Effect of carboxyl moiety on the electrochromic properties of 1,1′-dibenzyl-4,4′-bipyridinium salt","authors":"Meng Wang, Zhuangzhuang Yang, Lu Lu, Debao Xiao","doi":"10.1016/j.matlet.2025.138963","DOIUrl":"10.1016/j.matlet.2025.138963","url":null,"abstract":"<div><div>Viologen exhibits excellent comprehensive electrochromic properties including optical contrast, coloration efficiency, response time and cycling stability. Herein, the electrochromic properties of 1,1′-bis(4-carboxyl-benzyl)-4,4′-bipyridiniumdibromide were examined <em>via</em> introducing carboxyl moiety onto benzyl group. The solutions of this compound and benzyl viologen were sandwiched into electrochromic devices and their electrochromic properties were compared. We found that carboxylic moiety facilitates benzyl viologen to exhibit increased coloration efficiency up to 165.9 cm<sup>2</sup>/C with comparison to that of 131.6 cm<sup>2</sup>/C without this group. The optical contrast, ΔT, reaches up to 74.6 % for the carboxylic product while that of 61.3 % was obtained without this group. The optical contrast of carboxylic product monitored at 607 nm for 1000 cycles retained 93.3 % of its initial value, which is larger than that of 69.8 % without modification, indicating that the cycling stability is enhanced by carboxylic moiety. This work demonstrated that carboxylic group can improve the overall electrochromic performance of benzyl viologen.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"398 ","pages":"Article 138963"},"PeriodicalIF":2.7,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144322860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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