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Easy dismantling of steel/aluminum alloy die-casting joint by foaming using gas defects in aluminum alloy die-casting
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-02-14 DOI: 10.1016/j.matlet.2025.138236
Yoshihiko Hangai , Takuma Ishigai , Shinji Koyama , Ryosuke Suzuki , Yoshiaki Morisada , Hidetoshi Fujii
{"title":"Easy dismantling of steel/aluminum alloy die-casting joint by foaming using gas defects in aluminum alloy die-casting","authors":"Yoshihiko Hangai ,&nbsp;Takuma Ishigai ,&nbsp;Shinji Koyama ,&nbsp;Ryosuke Suzuki ,&nbsp;Yoshiaki Morisada ,&nbsp;Hidetoshi Fujii","doi":"10.1016/j.matlet.2025.138236","DOIUrl":"10.1016/j.matlet.2025.138236","url":null,"abstract":"<div><div>A steel and aluminum alloy die-casting friction stir welding joint was heated to investigate whether the joint could be easily separated by foaming using gas defects in the aluminum alloy die-casting plate. It was found that the gas defects could be used to foam without adding any foaming agent by heating the joining interface. The load and energy required to fracture the heat-foamed specimens can be respectively reduced to one-eighth and one-fiftieth of those for the as-joined specimens, resulting in easy dismantling.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"386 ","pages":"Article 138236"},"PeriodicalIF":2.7,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143429864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The effect of high-pressure torsion process on the microstructure and mechanical properties of Al-Zn-Mg-Cu alloy
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-02-14 DOI: 10.1016/j.matlet.2025.138235
Song Jian, Dong Feng, Xue Kemin, Ding Yonggen
{"title":"The effect of high-pressure torsion process on the microstructure and mechanical properties of Al-Zn-Mg-Cu alloy","authors":"Song Jian,&nbsp;Dong Feng,&nbsp;Xue Kemin,&nbsp;Ding Yonggen","doi":"10.1016/j.matlet.2025.138235","DOIUrl":"10.1016/j.matlet.2025.138235","url":null,"abstract":"<div><div>As a new generation of high-quality structural materials, the forming method of Al-Zn-Mg-Cu alloy has been widely studied. Based on the deformation characteristics of Al-Zn-Mg-Cu alloy, this article uses a restrictive HPT die to conduct HPT experiments on Al-Zn-Mg-Cu alloy under different process parameters (deformation temperature, number of torsion cycles). The results show that HPT deformation has a significant impact on the microstructure of Al-Zn-Mg-Cu alloy, significantly refining the grain size, significantly increasing the proportion of large-angle grain boundaries and dislocation density, weakening the texture characteristics, weakening the anisotropy of the material, enhancing the uniformity of the organization. In addition, HPT process significantly improves the mechanical properties of Al-Zn-Mg-Cu alloy, with tensile strength reaching 750 MPa.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"387 ","pages":"Article 138235"},"PeriodicalIF":2.7,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454846","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
A novel approach to enhance formability of thin SS304 foils via multi-stage micro-incremental forming 通过多级微增量成形提高 SS304 薄膜成形性的新方法
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-02-14 DOI: 10.1016/j.matlet.2025.138237
Peeyush Mahajan , Jeet P. Patil , Sushil Mishra
{"title":"A novel approach to enhance formability of thin SS304 foils via multi-stage micro-incremental forming","authors":"Peeyush Mahajan ,&nbsp;Jeet P. Patil ,&nbsp;Sushil Mishra","doi":"10.1016/j.matlet.2025.138237","DOIUrl":"10.1016/j.matlet.2025.138237","url":null,"abstract":"<div><div>Low aspect ratio poses a significant challenge in micro-forming processes due to pronounced anisotropy and size effects. Nevertheless, the high strength-to-weight ratio of thin foils makes them ideal for applications such as micro-channels and micro-gears. Multi-stage micro-incremental forming (MS µ-ISF) is an emerging technique in which a sheet is incrementally deformed to achieve the desired high aspect ratio in multiple stages. This study investigates the formability of conical frustums fabricated using MS µ-ISF compared to single-stage micro-incremental forming (SS µ-ISF) in stainless steel (SS304) foils of 100 and 200 µm thicknesses. Mechanical analysis revealed that MS µ-ISF improved formability by 2° for both sheet thicknesses (ST), attributed to a less thinning and reduced strain localization. Microstructural analysis confirmed the complete transformation of the austenite (γ) phase into martensite (α’) with absence of deformation twin formation in both SS and MS forming methods.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"386 ","pages":"Article 138237"},"PeriodicalIF":2.7,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143429865","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
Spectral investigation of SrAl2(SiO4)2: Ln3+ (Ln = Dy, Eu) co-doped Slawsonite phosphor for development of WLEDs
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-02-13 DOI: 10.1016/j.matlet.2025.138216
Sanket J. Helode , Pratap M. Kodate , S.J. Dhoble
{"title":"Spectral investigation of SrAl2(SiO4)2: Ln3+ (Ln = Dy, Eu) co-doped Slawsonite phosphor for development of WLEDs","authors":"Sanket J. Helode ,&nbsp;Pratap M. Kodate ,&nbsp;S.J. Dhoble","doi":"10.1016/j.matlet.2025.138216","DOIUrl":"10.1016/j.matlet.2025.138216","url":null,"abstract":"<div><div>This study explores the use of Eu<sup>3+</sup>-doped white-emitting phosphors to address red emission deficiency in WLEDs. A highly luminescent SrAl<sub>2</sub>(SiO<sub>4</sub>)<sub>2</sub>: Dy<sup>3+</sup>, Eu<sup>3+</sup> co-doped phosphor was synthesized via solution combustion. Structural and morphological analyses were conducted using XRD, FTIR, SEM, and EDS. Photoluminescence (PL) spectroscopy revealed the spectral behaviour of rare-earth ions in single and co-doping configurations. Dy<sup>3+</sup> emits yellow and blue, while Eu<sup>3+</sup> emits red. Co-doping showed energy transfer mechanisms, resolving red deficiency in WLEDs. This phosphor, with stable optical properties, shows potential for WLEDs, displays, and solid-state lighting applications.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"386 ","pages":"Article 138216"},"PeriodicalIF":2.7,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143429866","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 thermal conductivity and thermal shock resistance in diamond/copper composites through diamond surface etching
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-02-13 DOI: 10.1016/j.matlet.2025.138229
Zhenhua Su , Kai Han , Zhijie Ye , Jiwen Zhao , Wenxin Cao , Jiaqi Zhu
{"title":"Enhanced thermal conductivity and thermal shock resistance in diamond/copper composites through diamond surface etching","authors":"Zhenhua Su ,&nbsp;Kai Han ,&nbsp;Zhijie Ye ,&nbsp;Jiwen Zhao ,&nbsp;Wenxin Cao ,&nbsp;Jiaqi Zhu","doi":"10.1016/j.matlet.2025.138229","DOIUrl":"10.1016/j.matlet.2025.138229","url":null,"abstract":"<div><div>Diamond/Cu composite materials, with excellent thermal conductivity and adjustable coefficient of thermal expansion, can be applied to various electronic packaging applications. In this study, diamond surfaces were etched via tungsten coating and subsequent calcination. Using these etched diamonds as reinforcements, high thermal conductivity Diamond/Cu composites were successfully fabricated. Compared with non-etched diamonds, the etched diamond-reinforced composites demonstrated significantly improved thermal conductivity and enhanced resistance to thermal cycling. Notably, after 600 thermal shock cycles, the thermal conductivity of the material remained at 597 W/mK, showing only a minor decrease of 6.4 % from its initial value.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"387 ","pages":"Article 138229"},"PeriodicalIF":2.7,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454843","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
A Type-II g-C3N4/FeS2 heterojunction for enhanced Photo-electrochemical water splitting
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-02-13 DOI: 10.1016/j.matlet.2025.138177
Deepanshu Sharma , Mohit Khosya , Manoj Singh , Sungjemmenla , Vipin Kumar , Neeraj Khare
{"title":"A Type-II g-C3N4/FeS2 heterojunction for enhanced Photo-electrochemical water splitting","authors":"Deepanshu Sharma ,&nbsp;Mohit Khosya ,&nbsp;Manoj Singh ,&nbsp;Sungjemmenla ,&nbsp;Vipin Kumar ,&nbsp;Neeraj Khare","doi":"10.1016/j.matlet.2025.138177","DOIUrl":"10.1016/j.matlet.2025.138177","url":null,"abstract":"<div><div>Here, we present a type-II heterojunction g-C<sub>3</sub>N<sub>4</sub>/FeS<sub>2</sub> photoanode for photoelectrochemical (PEC) water splitting application. PEC measurement demonstrates that the current density under light illumination for the g-C<sub>3</sub>N<sub>4</sub>/FeS<sub>2</sub> photo-anode is approximately twice that of the bare C<sub>3</sub>N<sub>4</sub>. The band edges conditions between FeS<sub>2</sub> and C<sub>3</sub>N<sub>4</sub> semiconductors result in the formation of a type-II heterojunction, which promotes a fast charge transfer mechanism. The larger depletion width of the heterojunction g-C<sub>3</sub>N<sub>4</sub>/FeS<sub>2</sub> contributes to the enhancement of PEC properties. Electrochemical impedance spectroscopy (EIS) and Mott-Schottky measurements provide strong support for the increased current density of the g-C<sub>3</sub>N<sub>4</sub>/FeS<sub>2</sub> photo-anode. This heterojunction g-C<sub>3</sub>N<sub>4</sub>/FeS<sub>2</sub> is expected to play a significant role in future PEC water splitting applications.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"386 ","pages":"Article 138177"},"PeriodicalIF":2.7,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420400","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
A comparative study on microstructure and hardness properties of Inconel 625 alloy by resistance spot and seam welding methods
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-02-13 DOI: 10.1016/j.matlet.2025.138220
Erdem Mermer , Emin Taylan , Ezgi Eylen , Deniz Akın , Burhan Güven , Hanifi Çinici
{"title":"A comparative study on microstructure and hardness properties of Inconel 625 alloy by resistance spot and seam welding methods","authors":"Erdem Mermer ,&nbsp;Emin Taylan ,&nbsp;Ezgi Eylen ,&nbsp;Deniz Akın ,&nbsp;Burhan Güven ,&nbsp;Hanifi Çinici","doi":"10.1016/j.matlet.2025.138220","DOIUrl":"10.1016/j.matlet.2025.138220","url":null,"abstract":"<div><div>In this study, Inconel 625 annealed alloy has been studied by resistance spot and seam welding techniques that are frequently used in the aerospace industry. Microstructural and hardness properties have been discussed. Partial melting zone has been noticed in spot-welded specimen whereas this zone did not appear in seam-welded specimen. Laves phase are formed in eutectic structure with γ phase in partial melting zone. On the other hand, the amount of Laves phases are lower in fusion zone of both samples. Maximum hardness values are obtained in HAZ of the samples. Resistance seam-welded specimen presents higher hardness in fusion zone. The results of this study can provide a good reference for industrial resistance weld applications.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"386 ","pages":"Article 138220"},"PeriodicalIF":2.7,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420396","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
Evaluation of the aging process of an epoxy resin system using high performance chromatography and differential scanning calorimetry 利用高效色谱法和差示扫描量热法评估环氧树脂系统的老化过程
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-02-13 DOI: 10.1016/j.matlet.2025.138221
Adilson Silvestre de Aguiar , Luiz Claudio Pardini
{"title":"Evaluation of the aging process of an epoxy resin system using high performance chromatography and differential scanning calorimetry","authors":"Adilson Silvestre de Aguiar ,&nbsp;Luiz Claudio Pardini","doi":"10.1016/j.matlet.2025.138221","DOIUrl":"10.1016/j.matlet.2025.138221","url":null,"abstract":"<div><div>Composite materials consist of polymeric resin reinforced with carbon or glass fibers, often used in aerospace components. This study proposes using High Performance Liquid Chromatography (HPLC) and Differential Scanning Calorimetry (DSC) to assess epoxy resin aging. Our results show both methods effectively monitor aging, particularly by comparing product and reagent peaks tied to thermal transformations. This approach supports their use in material quality control, highlighting the research’s significance.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"387 ","pages":"Article 138221"},"PeriodicalIF":2.7,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436655","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
Nanocrystalline lanthanum-doped bismuth ferrite as a perovskite photosensitizer: Morphological, structural, optical, photovoltaic properties, and DFT calculations
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-02-12 DOI: 10.1016/j.matlet.2025.138217
Phathaitep Raksa , Prayoonsak Pluengphon , Pikaned Uppachai , Auttasit Tubtimtae , Ekasiddh Wongrat
{"title":"Nanocrystalline lanthanum-doped bismuth ferrite as a perovskite photosensitizer: Morphological, structural, optical, photovoltaic properties, and DFT calculations","authors":"Phathaitep Raksa ,&nbsp;Prayoonsak Pluengphon ,&nbsp;Pikaned Uppachai ,&nbsp;Auttasit Tubtimtae ,&nbsp;Ekasiddh Wongrat","doi":"10.1016/j.matlet.2025.138217","DOIUrl":"10.1016/j.matlet.2025.138217","url":null,"abstract":"<div><div>As a photosensitizer on the TiO<sub>2</sub> photoelectrode for solar cell applications, lanthanum-doped bismuth ferrite (La-doped BFO) was synthesized using the sol–gel method. BFO is doped at La doping contents of 5, 10, 15, and 20 wt% in bismuth ferrite. Morphological properties, structural characteristics, and chemical composition of resulting La-doped BFO samples are investigated using transmission electron microscopy, X-ray diffraction, and X-ray fluorescence analyses, respectively. Mixed phases of Bi<sub>24−x</sub>La<sub>x</sub>Fe<sub>2</sub>O<sub>39</sub> and Bi<sub>1−x</sub>La<sub>x</sub>FeO<sub>3</sub> are formed for the samples annealed at 550 °C, resulting in a power conversion efficiency of ∼1.3 % for the 15 wt% La-doped BFO sample (x = 0.15). Annealing at 700 °C yields the pure phase of Bi<sub>1−x</sub>La<sub>x</sub>FeO<sub>3</sub>, achieving the maximum power conversion efficiency of ∼1.9 %. Our findings show that the pure phase of BFO and optimum La doping make a potential candidate as a novel perovskite oxide-based photosensitizer in solar cell applications.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"386 ","pages":"Article 138217"},"PeriodicalIF":2.7,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143420399","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
Preparation and characterization of Beewax/PEG as eutectic organic phase change materials for thermal energy storage
IF 2.7 4区 材料科学
Materials Letters Pub Date : 2025-02-12 DOI: 10.1016/j.matlet.2025.138218
Arun Kumar Sharma , Prashant Sharma , Bhupendra Gupta
{"title":"Preparation and characterization of Beewax/PEG as eutectic organic phase change materials for thermal energy storage","authors":"Arun Kumar Sharma ,&nbsp;Prashant Sharma ,&nbsp;Bhupendra Gupta","doi":"10.1016/j.matlet.2025.138218","DOIUrl":"10.1016/j.matlet.2025.138218","url":null,"abstract":"<div><div>Phase change materials (PCMs) with high latent heat provide an efficient solution for thermal energy storage. This study evaluated binary mixtures of Beeswax (BW) and Polyethylene Glycol 1500 (PEG1500) as eutectic organic PCMs (EO-PCMs) prepared via impregnation and dispersion. Increasing PEG content in BW-PEG blends reduced melting onset temperatures from 58.65 °C to 35.29 °C and decreased latent heat from 209.6 J/g to 156.4 J/g. Fourier transform infrared spectroscopy confirmed chemical compatibility, and thermogravimetric analysis demonstrated improved thermal stability in PEG-rich mixtures, retaining up to 96.7 % of weight at 300 °C. These findings highlight BW-PEG EO-PCMs as promising materials for stable, low-temperature thermal energy storage.</div></div>","PeriodicalId":384,"journal":{"name":"Materials Letters","volume":"386 ","pages":"Article 138218"},"PeriodicalIF":2.7,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143403275","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
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