Crystals最新文献_第9页

Experimental Validation for Mechanically Tunable Defect Bands of a Reconfigurable Phononic Crystal with Permanent Magnets 带永久磁铁的可重构声波晶体机械可调缺陷带的实验验证

IF 2.7 4区材料科学

Crystals Pub Date : 2024-08-01 DOI: 10.3390/cryst14080701

Jeonggyu Yang, Soo-Ho Jo

{"title":"Experimental Validation for Mechanically Tunable Defect Bands of a Reconfigurable Phononic Crystal with Permanent Magnets","authors":"Jeonggyu Yang, Soo-Ho Jo","doi":"10.3390/cryst14080701","DOIUrl":"https://doi.org/10.3390/cryst14080701","url":null,"abstract":"Phononic crystals (PnCs) have garnered significant attention due to their unique ability to control elastic waves in unconventional ways. One area of research focuses on utilizing defects within PnCs. Defects create new pass bands within band gaps, leading to concentrated wave energy within the defects. However, defect-mode-enabled wave localization is effective only at specific frequencies, limiting its usefulness when the frequencies of incident waves vary. Existing methods to mechanically tune defect bands involve changing the geometries of unit cells or defects or attaching elastic foundations, which necessitates the detachment and reattachment of certain structures depending on the engineering situation. Considering these challenges, this study introduces a novel approach that utilizes the reconfigurable PnC design, incorporating permanent magnets and ferromagnetic materials. The case study involves a one-dimensional PnC consisting of a long metal beam with rectangular block-shaped permanent magnets periodically arranged and attached to the beam by magnetic forces. A defect is created by shifting a subset of these block-shaped permanent magnets in parallel. The extent of this parallel movement alters the vibrating characteristics of the defect, facilitating the mechanical control of the defect bands in the defective PnC. The effectiveness of this approach is experimentally validated.","PeriodicalId":10855,"journal":{"name":"Crystals","volume":"54 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141882830","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

Mechanisms for Enhancing Luminescence Yield in KBr Crystals under the Influence of Low-Temperature Uniaxial Elastic Deformation 低温单轴弹性形变影响下提高 KBr 晶体发光产率的机制

IF 2.7 4区材料科学

Crystals Pub Date : 2024-07-31 DOI: 10.3390/cryst14080698

Kuanyshbek Shunkeyev, Shynar Sagimbayeva, Zhiger Ubaev, Adelya Kenzhebayeva

引用次数: 0

Effect of Al-Ti-B-Er on the Microstructure and Properties of Ultrahigh-Strength Aluminum Alloy Al-Ti-B-Er 对超高强度铝合金微观结构和性能的影响

IF 2.7 4区材料科学

Crystals Pub Date : 2024-07-30 DOI: 10.3390/cryst14080695

Xiao Wang, Zizhi Ying, En Hu, Juntao Ma, Xiaoqing Zhang, Tengfei Ma, Xiaohong Wang

{"title":"Effect of Al-Ti-B-Er on the Microstructure and Properties of Ultrahigh-Strength Aluminum Alloy","authors":"Xiao Wang, Zizhi Ying, En Hu, Juntao Ma, Xiaoqing Zhang, Tengfei Ma, Xiaohong Wang","doi":"10.3390/cryst14080695","DOIUrl":"https://doi.org/10.3390/cryst14080695","url":null,"abstract":"To refine the grain size and improve the mechanical properties of ultrahigh-strength aluminum alloy (Al-10Zn-1.9Mg-1.6Cu-0.12Zr), the Al-Ti-B-Er grain refiner was prepared by the melt reaction method using the aluminum melt and Al + Ti + B precursor. The results exhibit that the Al-Ti-B-Er grain refiner is mainly composed of a block TiAl3 phase, and loose agglomerated nano-sized TiB2 and Al3Er phases. The microstructure of ultrahigh-strength aluminum is significantly affected by the Al-Ti-B-Er refiner, which changes from dendrite to equiaxial grain with increasing Al-Ti-B-Er content, and the size of the eutectic phase is significantly refined. The high-efficiency refinement of Al-Ti-B-Er is due to Er promoting the uniform distribution of TiAl3 particles and the formation of loose agglomerated nano-sized TiB2 particles. The optimal addition content of Al-Ti-B-Er into ultrahigh-strength aluminum alloys is 1 wt%, whose grain size is approximately 40 µm. Additionally, the strength and ductility of ultrahigh-strength aluminum alloys are simultaneously improved by adding 1wt% Al-Ti-B-Er after the T6 treatment, reaching 756 MPa and 20%, respectively. This enhancement in strength and ductility is mainly attributed to grain refinement and the eutectic phase refinement.","PeriodicalId":10855,"journal":{"name":"Crystals","volume":"123 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141871903","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

Synthesis and Characterization of Carboxymethylcellulose-Functionalized Magnetite Nanoparticles as Contrast Agents for THz Spectroscopy with Applications in Oncology 羧甲基纤维素功能化磁铁矿纳米粒子的合成与表征--作为太赫兹光谱对比剂在肿瘤学中的应用

IF 2.7 4区材料科学

Crystals Pub Date : 2024-07-30 DOI: 10.3390/cryst14080696

Oliver Daniel Schreiner, Petrisor Samoila, Thomas Gabriel Schreiner, Diana Socotar, Romeo Cristian Ciobanu

引用次数: 0

Time-Dependent Study of Inclusions in Bearing Steel Subjected to Rare Earth Treatment with Secondary Oxidation 轴承钢经稀土二次氧化处理后夹杂物的时间依赖性研究

IF 2.7 4区材料科学

Crystals Pub Date : 2024-07-30 DOI: 10.3390/cryst14080697

Weining Wang, Wenzhi Xia, Yun Zhou, Aijun Deng, Guangda Bao, Zhiyou Liao, Haichuan Wang

{"title":"Time-Dependent Study of Inclusions in Bearing Steel Subjected to Rare Earth Treatment with Secondary Oxidation","authors":"Weining Wang, Wenzhi Xia, Yun Zhou, Aijun Deng, Guangda Bao, Zhiyou Liao, Haichuan Wang","doi":"10.3390/cryst14080697","DOIUrl":"https://doi.org/10.3390/cryst14080697","url":null,"abstract":"Due to the strong reducibility and chemical activity of rare earths, the diffusion behavior and secondary oxidation of rare earths in the steel liquid will also have a significant impact on the modified products when rare earths are added to bearing steel, resulting in poor control of distribution behavior. Therefore, this paper studies the influence of time factors on the evolution of rare earth inclusions. The inclusion evolution behavior at different times when the bearing steel was treated with rare earths and subjected to secondary oxidation was simulated at 1873 K (1600 °C). At a cerium content of 0.012% in steel and a secondary oxidation of 0.0025%, the cerium content in steel and the total oxygen (T.O.) content in steel were determined at the 30 s, 3 min, 5 min, and 7 min after the addition and the inclusions were characterized by automatic scanning electron microscopy. The results demonstrated the formation of a cerium-enriched zone after the addition of the cerium alloy to the steel. As time progressed, a considerable number of inclusions were generated in the cerium-enriched zone, which subsequently disappeared. The trend in the composition of the inclusions can be described as Al2O3 → Ce2O2S + CeS → Ce2O2S. The final composition of the inclusions matches the thermodynamic phase diagram. Following the addition of the transient oxidant Fe2O3 to the molten steel, an oxygen-enriched zone was formed. As time progressed, a considerable number of inclusions were generated in the oxygen-enriched zone and subsequently disappeared. The trend of inclusions composition was as follows: Ce2O3 + CeAlO3 + Al2O3 → Ce2O3 + CeAlO3 → Ce2O2S + CeAlO3. The final inclusion composition coincides with the thermodynamic phase diagram.","PeriodicalId":10855,"journal":{"name":"Crystals","volume":"49 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141871905","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

Phase-Field Simulation of Grain Growth in Uranium Silicide Nuclear Fuel 硅化铀核燃料中晶粒生长的相场模拟

IF 2.7 4区材料科学

Crystals Pub Date : 2024-07-29 DOI: 10.3390/cryst14080691

Xiaoqiang Pan, Yongxiao La, Yuxuan Liao, Yifan Wang, Yonghong Lu, Wenbo Liu

引用次数: 0

A Highly Efficient Plasmonic Polarization Conversion Metasurface Supporting a Large Angle of Incidence 支持大入射角的高效等离子极化转换元表面

IF 2.7 4区材料科学

Crystals Pub Date : 2024-07-29 DOI: 10.3390/cryst14080694

Bo Cheng, Zengxuan Jiang, Yuxiao Zou, Guofeng Song

引用次数: 0

Interplay between Structural, Electronic, and Magnetic Properties in the p0-d Semi-Heusler Compounds: The Case of Li-Based Compounds p0-d 半休斯勒化合物的结构、电子和磁性之间的相互作用：锂基化合物案例

IF 2.7 4区材料科学

Crystals Pub Date : 2024-07-29 DOI: 10.3390/cryst14080693

Kemal Özdoğan, Iosif Galanakis

引用次数: 0

A Bi-Pronged Attempt at Normalizing DL-EPRT Vis-à-Vis Grain-Boundary/σ-Phase Locales in Thermally Sensitized UNS S32205 Duplex Stainless Steel 热敏化 UNS S32205 双相不锈钢中 DL-EPRT 与晶界/σ 相位置关系正火的双管齐下尝试

IF 2.7 4区材料科学

Crystals Pub Date : 2024-07-29 DOI: 10.3390/cryst14080692

Abdulla F. Alshater, Abbas S. Hakeem, Ablikim Bake, Hatim D. Mohamed, Hosni M. Ezuber, Alia Mustafa, Ruqayah R. Alnasser, Mezna K. Al Ruwaihi, Aysha I. Rashdan, Fatema A. Jaberi, Khadija S. Bahar

{"title":"A Bi-Pronged Attempt at Normalizing DL-EPRT Vis-à-Vis Grain-Boundary/σ-Phase Locales in Thermally Sensitized UNS S32205 Duplex Stainless Steel","authors":"Abdulla F. Alshater, Abbas S. Hakeem, Ablikim Bake, Hatim D. Mohamed, Hosni M. Ezuber, Alia Mustafa, Ruqayah R. Alnasser, Mezna K. Al Ruwaihi, Aysha I. Rashdan, Fatema A. Jaberi, Khadija S. Bahar","doi":"10.3390/cryst14080692","DOIUrl":"https://doi.org/10.3390/cryst14080692","url":null,"abstract":"In a quest to vet UNS S32205 as a potential structural material to serve moderate-to-high temperature operations of NPP auxiliary components, the DL-EPR test was exploited. A bifronted scheme comprised of 650 and 850 °C discrete treatments intended to explore progressive eutectoid decomposition and degree-of-sensitization (DoS) scenarios was adopted. The nuance witnessed with yet another dual approach—the Cihal- and image processing (IP)-normalized signal landscape—was rationalized through its attribution to culprit microstructures. This was sought, inter alia, in the vicinity of grain boundaries and σ-phase inclusions by virtue of postmortem FESEM, STEM-EDX, HRTEM SAED and XRD ascertainment. Discernable reactivation-kinetics resurgence was believed to mark the onset of deleterious σ-phase dissolution. This only came into fruition with longer ageing times (8–17 h) at 650 °C and succumbed to prematurely (1 h), and at DC biases more cathodic than −0.25 VAg/AgCl with the 850 °C counterpart. Opportune corroboration was offered in ir/ia breakaway for the respective conditions, which was unveiled to be particularly pre-emptive (5 h) with IP- vs. Cihal-normalized peers (8 h) related to the 650 °C condition. Meanwhile, the 850 °C condition endured a similar surge after as little as 1 h of ageing across the board, which hints at concomitant sigma-phase culpability.","PeriodicalId":10855,"journal":{"name":"Crystals","volume":"175 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141871901","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

Synthesis and Investigation of ReSe2 Thin Films Obtained from Magnetron Sputtered Re and ReOx 磁控溅射 Re 和 ReOx 生成的 ReSe2 薄膜的合成与研究

IF 2.7 4区材料科学

Crystals Pub Date : 2024-07-28 DOI: 10.3390/cryst14080690

Kevon Kadiwala, Luize Dipane, Eriks Dipans, Arturs Bundulis, Martins Zubkins, Andrejs Ogurcovs, Jevgenijs Gabrusenoks, Dmitry Bocharov, Edgars Butanovs, Boris Polyakov

{"title":"Synthesis and Investigation of ReSe2 Thin Films Obtained from Magnetron Sputtered Re and ReOx","authors":"Kevon Kadiwala, Luize Dipane, Eriks Dipans, Arturs Bundulis, Martins Zubkins, Andrejs Ogurcovs, Jevgenijs Gabrusenoks, Dmitry Bocharov, Edgars Butanovs, Boris Polyakov","doi":"10.3390/cryst14080690","DOIUrl":"https://doi.org/10.3390/cryst14080690","url":null,"abstract":"The promise of two-dimensional (2D) rhenium diselenide (ReSe2) in electronics and optoelectronics has sparked considerable interest in this material. However, achieving the growth of high-quality ReSe2 thin films on a wafer scale remains a significant challenge. In this study, we adopted a two-step method to produce ReSe2 thin films by combining magnetron sputtering of Re and ReOx onto flat substrates with subsequent selenization via atmospheric pressure chemical vapor transport (CVT). After analyzing the produced films using X-ray diffraction to identify the crystalline phase in formed thin film and scanning electron microscopy (SEM) to examine surface morphology, it was determined that the suitable temperature range for the 15 min selenization process with CVT is 650 °C–750 °C. Further investigation of these optimally produced ReSe2 thin films included atomic force microscopy (AFM), X-ray photoelectron spectroscopy, and Raman spectroscopy. The bulk electrical analysis of these films and AFM and SEM surface morphology revealed a strong reliance on the type of precursor material used for their synthesis, whereas optical measurements indicated a potential for the films in non-linear optics applications, irrespective of the precursor or temperature used. This study not only provides a new pathway for the growth of ReSe2 films but also sheds light on the synthesis approaches of other 2D transition metal dichalcogenide materials.","PeriodicalId":10855,"journal":{"name":"Crystals","volume":"36 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141873227","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