Pub Date : 2024-03-30DOI: 10.1142/s0217984924410057
Kang-Min Kim, Sanjay Kumar, Yun-Hae Kim
Bonding performance of carbon fiber/polyetherketoneketone (CF/PEKK) laminates is closely related to crystallinity and is influenced by growth, formation, and density of spherulites. Press consolidation, with its ability to adjust pressure, exhibits superior quality compared to oven consolidation. However, bonding and production of CF/PEKK laminates using Press consolidation exhibit significant variations in quality depending on forming conditions. While research on producing CF/PEKK laminates using press consolidation is currently active, there is a lack of studies on co-consolidation for CF/PEKK laminates. Thus, in this study, establishment of forming process variables for press consolidation was conducted to achieve excellent bonding performance for CF/PEKK. Furthermore, IR heating-assisted surface heat treatment was employed to enhance bonding performance of CF/PEKK laminates by controlling crystallinity and spherulites. To analyze bonding performance, short bean shear testing was conducted to obtain interlaminar shear strength (ILSS). Results showed that surface modification through IR heating led to an increase in crystallinity and a noticeable growth in size of spherulites. In specific conditions, improved bonding performance was observed. This is judged to be primarily due to increase in spherulite size and crystallinity at bonding interface, attributed to specific conditions of both surface treatment through IR heating and Press consolidation.
{"title":"Optimizing bonding performance in CF/PEKK composites: The role of IR heating and press consolidation","authors":"Kang-Min Kim, Sanjay Kumar, Yun-Hae Kim","doi":"10.1142/s0217984924410057","DOIUrl":"https://doi.org/10.1142/s0217984924410057","url":null,"abstract":"Bonding performance of carbon fiber/polyetherketoneketone (CF/PEKK) laminates is closely related to crystallinity and is influenced by growth, formation, and density of spherulites. Press consolidation, with its ability to adjust pressure, exhibits superior quality compared to oven consolidation. However, bonding and production of CF/PEKK laminates using Press consolidation exhibit significant variations in quality depending on forming conditions. While research on producing CF/PEKK laminates using press consolidation is currently active, there is a lack of studies on co-consolidation for CF/PEKK laminates. Thus, in this study, establishment of forming process variables for press consolidation was conducted to achieve excellent bonding performance for CF/PEKK. Furthermore, IR heating-assisted surface heat treatment was employed to enhance bonding performance of CF/PEKK laminates by controlling crystallinity and spherulites. To analyze bonding performance, short bean shear testing was conducted to obtain interlaminar shear strength (ILSS). Results showed that surface modification through IR heating led to an increase in crystallinity and a noticeable growth in size of spherulites. In specific conditions, improved bonding performance was observed. This is judged to be primarily due to increase in spherulite size and crystallinity at bonding interface, attributed to specific conditions of both surface treatment through IR heating and Press consolidation.","PeriodicalId":503716,"journal":{"name":"Modern Physics Letters B","volume":"50 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140363182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A perfect absorber in the terahertz band with ultra-broadband and triple narrowband is achieved, using Vanadium Dioxide (VO2) and patterned graphene hybrid metamaterials, which can be converted by adjusting the temperature. When only VO2 is present in the structure, the absorption spectrum shows broadband absorption in metallic phases of VO2. Adding graphene to metallic VO2, the absorption bandwidth over 95% is expanded to 5.5[Formula: see text]THz, which is 1.9 times broader compared to the absence of graphene, and the absorption bandwidth over 99% increases to 1.72[Formula: see text]THz. Adding graphene to insulating VO2, three narrowband absorptions appear with absorption rates approaching 100%. Polarization characteristics show that ultra-broadband is insensitive to polarization angle, while multi-frequency narrowband exhibits sensitivity. Therefore, the proposed tunable multifunctional absorber can greatly optimize the absorption capacity of ultra-broadband and multi-frequency narrow bands, demonstrating great potential in future practical applications.
{"title":"Terahertz ultra-broadband and multi-frequency narrowband perfect absorber based on compound metamaterial","authors":"Ruihan Yang, Zhimin Liu, Xin Luo, Cheng Ji, Guangxin Yang, Yadong Xie","doi":"10.1142/s0217984924503226","DOIUrl":"https://doi.org/10.1142/s0217984924503226","url":null,"abstract":"A perfect absorber in the terahertz band with ultra-broadband and triple narrowband is achieved, using Vanadium Dioxide (VO2) and patterned graphene hybrid metamaterials, which can be converted by adjusting the temperature. When only VO2 is present in the structure, the absorption spectrum shows broadband absorption in metallic phases of VO2. Adding graphene to metallic VO2, the absorption bandwidth over 95% is expanded to 5.5[Formula: see text]THz, which is 1.9 times broader compared to the absence of graphene, and the absorption bandwidth over 99% increases to 1.72[Formula: see text]THz. Adding graphene to insulating VO2, three narrowband absorptions appear with absorption rates approaching 100%. Polarization characteristics show that ultra-broadband is insensitive to polarization angle, while multi-frequency narrowband exhibits sensitivity. Therefore, the proposed tunable multifunctional absorber can greatly optimize the absorption capacity of ultra-broadband and multi-frequency narrow bands, demonstrating great potential in future practical applications.","PeriodicalId":503716,"journal":{"name":"Modern Physics Letters B","volume":"53 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140361779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-30DOI: 10.1142/s0217984924410100
Ye-Rim Park, Sanjay Kumar, Anam Naz, Yun-Hae Kim
The filament winding process used in this study mainly produces pipe-shaped structures. In this structure, there is an intersection of fiber bundles, which makes the fiber bundles overlapping with other fiber bundles wavy. In that area, the concentration of stress and deformation appears. Therefore, halloysite nanotubes were applied among nanoparticles to supplement this through the study. In the utilization of nanoparticles, the control of agglomeration phenomena and the ease of dispersion are pivotal factors. In consideration of this, general halloysite nanotubes were heat-treated at 1000∘C to produce amorphous halloysite nanotubes to reduce the surface energy of particles, making it easier to control agglomeration phenomena and the ease of dispersion, and it was intended to supplement and improve mechanical properties in local applications through interleaved structure design. In this study, each stacked structure was analyzed through an axial pipe bending test. The fracture pattern for each structure was observed through an optical microscope. As a result, A3 reinforced with A-HNT for all layers had the highest load value (4207N), and the flexural strength was also measured high accordingly. It shows a small degree of fracture compared to other structures. Following that, E2A1, whose innermost layer was reinforced with A-HNT, had the second-highest load value (3864N), and accordingly, the second-highest flexural strength was measured. The observed surface of the pipe was the outermost layer (E), and it was observed that the degree of fracture was more advanced than that of A3.
{"title":"Flexural behavior of carbon/epoxy nanocomposite pipes with interleaved structure","authors":"Ye-Rim Park, Sanjay Kumar, Anam Naz, Yun-Hae Kim","doi":"10.1142/s0217984924410100","DOIUrl":"https://doi.org/10.1142/s0217984924410100","url":null,"abstract":"The filament winding process used in this study mainly produces pipe-shaped structures. In this structure, there is an intersection of fiber bundles, which makes the fiber bundles overlapping with other fiber bundles wavy. In that area, the concentration of stress and deformation appears. Therefore, halloysite nanotubes were applied among nanoparticles to supplement this through the study. In the utilization of nanoparticles, the control of agglomeration phenomena and the ease of dispersion are pivotal factors. In consideration of this, general halloysite nanotubes were heat-treated at 1000∘C to produce amorphous halloysite nanotubes to reduce the surface energy of particles, making it easier to control agglomeration phenomena and the ease of dispersion, and it was intended to supplement and improve mechanical properties in local applications through interleaved structure design. In this study, each stacked structure was analyzed through an axial pipe bending test. The fracture pattern for each structure was observed through an optical microscope. As a result, A3 reinforced with A-HNT for all layers had the highest load value (4207N), and the flexural strength was also measured high accordingly. It shows a small degree of fracture compared to other structures. Following that, E2A1, whose innermost layer was reinforced with A-HNT, had the second-highest load value (3864N), and accordingly, the second-highest flexural strength was measured. The observed surface of the pipe was the outermost layer (E), and it was observed that the degree of fracture was more advanced than that of A3.","PeriodicalId":503716,"journal":{"name":"Modern Physics Letters B","volume":"41 22","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140363695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-30DOI: 10.1142/s0217984924410136
Tae-Sun Bang, Sanjay Kumar, Yun-Hae Kim
This research addresses limitations in current aviation composite assembly techniques, often constrained by certification challenges. To enhance bonded composite components, open holes are frequently introduced, leading to increased vulnerability to delamination, a prominent failure mode in composite laminates. This study focuses on observing the impact of open holes on the mode II behavior of composites under various distances and hole diameter conditions. Results illustrate distinct load–displacement curves influenced by hole size, with shorter distances accelerating crack propagation, evidenced by reduced elastic regions and lower load values. Analyzing specimen appearances and crack patterns highlights stress concentration at the hole, influencing initiation and propagation. In the absence of a hole, cracks exhibit a zig-zag pattern near the loading point, while with a hole, they concentrate around it. Elastic region length varies with the pre-crack-to-hole distance, indicating accelerated crack propagation in shorter distances. This study underscores the direct influence of hole size on load values, emphasizing its pivotal role in determining composite mechanical properties. This research provides valuable insights into hole characteristics’ interplay with delamination behavior in carbon fiber-reinforced composites, essential for optimizing aerospace component design and structural integrity.
这项研究解决了当前航空复合材料组装技术的局限性，这些技术往往受到认证挑战的限制。为了增强粘合复合材料组件的性能，经常会引入开孔，从而导致复合材料层压板中一种突出的失效模式--分层的脆弱性增加。本研究的重点是观察在不同距离和孔径条件下，开孔对复合材料模式 II 行为的影响。结果表明，孔径大小会影响不同的载荷-位移曲线，较短的距离会加速裂纹扩展，表现为弹性区域减少和载荷值降低。对试样外观和裂纹模式的分析突出表明，应力集中在孔处，影响了裂纹的产生和扩展。在无孔的情况下，裂纹在加载点附近呈 "之 "字形分布，而在有孔的情况下，裂纹则集中在加载点周围。弹性区域的长度随裂纹前到孔的距离而变化，表明裂纹在较短的距离内加速扩展。这项研究强调了孔尺寸对载荷值的直接影响，突出了孔尺寸在决定复合材料机械性能方面的关键作用。这项研究为了解碳纤维增强复合材料中孔的特性与分层行为之间的相互作用提供了宝贵的见解，对于优化航空航天部件的设计和结构完整性至关重要。
{"title":"Delamination mechanism in CF/EPOXY with open hole under mode II loading at different distances","authors":"Tae-Sun Bang, Sanjay Kumar, Yun-Hae Kim","doi":"10.1142/s0217984924410136","DOIUrl":"https://doi.org/10.1142/s0217984924410136","url":null,"abstract":"This research addresses limitations in current aviation composite assembly techniques, often constrained by certification challenges. To enhance bonded composite components, open holes are frequently introduced, leading to increased vulnerability to delamination, a prominent failure mode in composite laminates. This study focuses on observing the impact of open holes on the mode II behavior of composites under various distances and hole diameter conditions. Results illustrate distinct load–displacement curves influenced by hole size, with shorter distances accelerating crack propagation, evidenced by reduced elastic regions and lower load values. Analyzing specimen appearances and crack patterns highlights stress concentration at the hole, influencing initiation and propagation. In the absence of a hole, cracks exhibit a zig-zag pattern near the loading point, while with a hole, they concentrate around it. Elastic region length varies with the pre-crack-to-hole distance, indicating accelerated crack propagation in shorter distances. This study underscores the direct influence of hole size on load values, emphasizing its pivotal role in determining composite mechanical properties. This research provides valuable insights into hole characteristics’ interplay with delamination behavior in carbon fiber-reinforced composites, essential for optimizing aerospace component design and structural integrity.","PeriodicalId":503716,"journal":{"name":"Modern Physics Letters B","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140361720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-30DOI: 10.1142/s0217984924410082
Cheng-Ho Chen, Jian-Fu Wu, Hung-Mao Lin
In this study, the conductive polyaniline doped by hydrochloric acid (PANIHCl)/zinc oxide (PANIHCl/ZnO) conductive composite was synthesized by in-situ polymerization. The conductive PANIHCl solution or PANIHCl/ZnO conductive composite solution was coated on an interdigital electrode (IDE) by drop coating to make a humidity sensor. The synthesis process, chemical structure, surface morphology, and humidity sensing characteristics of PANIHCl and PANIHCl/ZnO conductive composite were investigated. Field emission scanning electron microscope (FE-SEM) images suggested that the surface morphology of the PANIHCl/ZnO conductive composite is fibrous or rod-shaped, with a diameter of about 100 nm. The sensing responses of PANIHCl and PANIHCl/ZnO were 40% and 87%, respectively. The humidity sensing response of PANIHCl/ZnO as the sensing material was more than twice that of PANIHCl as the sensing material. The response time (Tres) is 13 s, and the recovery time (Trec) is 171 s. Research results showed that adding ZnO to PANIHCl can effectively improve the response of the sensor to humidity detection. Therefore, using PANIHCl/ZnO conductive composite as a sensing material will have great potential for application in humidity or other gas sensing devices.
{"title":"Synthesis of PANIHCl/ZnO conductive composite by in-situ polymerization and for humidity sensing application","authors":"Cheng-Ho Chen, Jian-Fu Wu, Hung-Mao Lin","doi":"10.1142/s0217984924410082","DOIUrl":"https://doi.org/10.1142/s0217984924410082","url":null,"abstract":"In this study, the conductive polyaniline doped by hydrochloric acid (PANIHCl)/zinc oxide (PANIHCl/ZnO) conductive composite was synthesized by in-situ polymerization. The conductive PANIHCl solution or PANIHCl/ZnO conductive composite solution was coated on an interdigital electrode (IDE) by drop coating to make a humidity sensor. The synthesis process, chemical structure, surface morphology, and humidity sensing characteristics of PANIHCl and PANIHCl/ZnO conductive composite were investigated. Field emission scanning electron microscope (FE-SEM) images suggested that the surface morphology of the PANIHCl/ZnO conductive composite is fibrous or rod-shaped, with a diameter of about 100 nm. The sensing responses of PANIHCl and PANIHCl/ZnO were 40% and 87%, respectively. The humidity sensing response of PANIHCl/ZnO as the sensing material was more than twice that of PANIHCl as the sensing material. The response time (Tres) is 13 s, and the recovery time (Trec) is 171 s. Research results showed that adding ZnO to PANIHCl can effectively improve the response of the sensor to humidity detection. Therefore, using PANIHCl/ZnO conductive composite as a sensing material will have great potential for application in humidity or other gas sensing devices.","PeriodicalId":503716,"journal":{"name":"Modern Physics Letters B","volume":"31 25","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140364252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-30DOI: 10.1142/s0217984924410112
Xiaoqi Li, Sanjay Kumar, Dong-Wook Hwang, Yun-Hae Kim
The pinned joint tensile properties and failure behaviors of carbon-fiber-reinforced polyetherketoneketone (CF/PEKK) composites are sensitive to application temperatures. Herein, this study investigated the temperature-dependent mechanical behavior of CF/PEKK composites in a pinned joint configuration, emphasizing the impact on tensile behavior and bearing strength. Utilizing Solvay’s CF/PEKK prepreg with a quasi-isotropic stacking sequence, tensile tests were conducted at [Formula: see text]C and 230∘C. At [Formula: see text]C, increased load-pin displacement stiffness was observed, attributed to reduced polymer chain mobility, leading to increased peak load and concentrated bearing area around the pin contact region. Conversely, at 230∘C, a substantial reduction in stiffness and peak load was evident, emphasizing the severe deterioration of pin-load strength. Fracture analysis revealed distinct failure modes at different temperatures, highlighting localized compressive failure at [Formula: see text]C and severe permanent bearing failure at 230∘C. Understanding these temperature-dependent behaviors is critical for optimizing CF/PEKK composite applications in diverse industrial settings, providing insights for enhanced performance and reliability. The findings offer valuable information on the material’s behavior under extreme temperature conditions, contributing to the design and application of CF/PEKK composites in various industrial scenarios.
{"title":"Temperature-dependent pinned joint tensile behavior and failure analysis of CF/PEKK composites","authors":"Xiaoqi Li, Sanjay Kumar, Dong-Wook Hwang, Yun-Hae Kim","doi":"10.1142/s0217984924410112","DOIUrl":"https://doi.org/10.1142/s0217984924410112","url":null,"abstract":"The pinned joint tensile properties and failure behaviors of carbon-fiber-reinforced polyetherketoneketone (CF/PEKK) composites are sensitive to application temperatures. Herein, this study investigated the temperature-dependent mechanical behavior of CF/PEKK composites in a pinned joint configuration, emphasizing the impact on tensile behavior and bearing strength. Utilizing Solvay’s CF/PEKK prepreg with a quasi-isotropic stacking sequence, tensile tests were conducted at [Formula: see text]C and 230∘C. At [Formula: see text]C, increased load-pin displacement stiffness was observed, attributed to reduced polymer chain mobility, leading to increased peak load and concentrated bearing area around the pin contact region. Conversely, at 230∘C, a substantial reduction in stiffness and peak load was evident, emphasizing the severe deterioration of pin-load strength. Fracture analysis revealed distinct failure modes at different temperatures, highlighting localized compressive failure at [Formula: see text]C and severe permanent bearing failure at 230∘C. Understanding these temperature-dependent behaviors is critical for optimizing CF/PEKK composite applications in diverse industrial settings, providing insights for enhanced performance and reliability. The findings offer valuable information on the material’s behavior under extreme temperature conditions, contributing to the design and application of CF/PEKK composites in various industrial scenarios.","PeriodicalId":503716,"journal":{"name":"Modern Physics Letters B","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140364537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-30DOI: 10.1142/s0217984924410148
Dong-Wook Hwang, Sanjay Kumar, Su-Min Jo, Xiaoqi Li, Yun-Hae Kim
This study investigated the pin-loaded tensile behavior, bearing strength, and failure mechanisms of thermosetting and thermoplastic composite materials. Specifically, the investigation focuses on carbon-fiber-reinforced polyetherketoneketone (CF/PEKK) and carbon-fiber-reinforced epoxy (CF/EPOXY). Notably, CF/PEKK exhibited a shear-out failure mode, surpassing CF/EPOXY with a 56.4% higher peak load. The absence of crack propagation in CF/EPOXY, attributed to the presence of yarn at a 90∘ angle, leads to bearing failure. In contrast, CF/PEKK demonstrates a significantly higher bearing strength, approximately 150[Formula: see text]MPa greater than CF/EPOXY. This discrepancy in performance suggests that CF/PEKK holds promise as a structural material for applications involving the fastening of thermoplastic composites, presenting a viable alternative to traditional thermosetting composites. The findings imply that the unique failure mechanisms and enhanced mechanical properties of CF/PEKK make it a compelling candidate for use in scenarios where thermosetting composites are conventionally applied. This study contributes valuable insights into the potential advancements and applications of thermoplastic composites in structural materials, paving the way for optimized and innovative engineering solutions.
{"title":"Comparison of pin-loaded tensile behavior and failure behavior of thermosetting and thermoplastic composite","authors":"Dong-Wook Hwang, Sanjay Kumar, Su-Min Jo, Xiaoqi Li, Yun-Hae Kim","doi":"10.1142/s0217984924410148","DOIUrl":"https://doi.org/10.1142/s0217984924410148","url":null,"abstract":"This study investigated the pin-loaded tensile behavior, bearing strength, and failure mechanisms of thermosetting and thermoplastic composite materials. Specifically, the investigation focuses on carbon-fiber-reinforced polyetherketoneketone (CF/PEKK) and carbon-fiber-reinforced epoxy (CF/EPOXY). Notably, CF/PEKK exhibited a shear-out failure mode, surpassing CF/EPOXY with a 56.4% higher peak load. The absence of crack propagation in CF/EPOXY, attributed to the presence of yarn at a 90∘ angle, leads to bearing failure. In contrast, CF/PEKK demonstrates a significantly higher bearing strength, approximately 150[Formula: see text]MPa greater than CF/EPOXY. This discrepancy in performance suggests that CF/PEKK holds promise as a structural material for applications involving the fastening of thermoplastic composites, presenting a viable alternative to traditional thermosetting composites. The findings imply that the unique failure mechanisms and enhanced mechanical properties of CF/PEKK make it a compelling candidate for use in scenarios where thermosetting composites are conventionally applied. This study contributes valuable insights into the potential advancements and applications of thermoplastic composites in structural materials, paving the way for optimized and innovative engineering solutions.","PeriodicalId":503716,"journal":{"name":"Modern Physics Letters B","volume":"47 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140363977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, the alloys used contained Co, Cr, Fe, Ni, and V as the primary elements, while 6%–10% Cu was used as the added element. The high-entropy alloys (HEAs) were made in an electric-arc vacuum furnace from which specimens in the form of cylinders with a 5-mm diameter and 5-mm length were fabricated. An XRD analysis revealed that alloys with 6% and 8% Cu had a single-phase FCC structure, and a weak BCC peak only appeared in the (110) direction in alloys with 10% Cu. A universal testing machine was used for testing at the strain rates of [Formula: see text][Formula: see text]s[Formula: see text], [Formula: see text][Formula: see text]s[Formula: see text], and [Formula: see text][Formula: see text]s[Formula: see text], and the high strain rate was tested using a split Hopkinson pressure bar (SHPB) under strain at 3000[Formula: see text]s[Formula: see text], 4000[Formula: see text]s[Formula: see text], and 5000[Formula: see text]s[Formula: see text], respectively. The specimens did not fracture during the quasi-static compression and dynamic impact tests, which displayed better ductility. The surface of the three alloys had extensive dendrites and non-equiaxed crystal structures. In an EDS composition analysis, the Cr and V elements were more frequently observed in the intergranular region than in the interdendritic region.
{"title":"Mechanical properties of CoCrFeNiV high-entropy alloys with different Cu element contents under different strain rates","authors":"Chi-Fan Liu, Shih-Chen Shi, Wei-Ming Huang, Tao-Hsing Chen","doi":"10.1142/s021798492441001x","DOIUrl":"https://doi.org/10.1142/s021798492441001x","url":null,"abstract":"In this study, the alloys used contained Co, Cr, Fe, Ni, and V as the primary elements, while 6%–10% Cu was used as the added element. The high-entropy alloys (HEAs) were made in an electric-arc vacuum furnace from which specimens in the form of cylinders with a 5-mm diameter and 5-mm length were fabricated. An XRD analysis revealed that alloys with 6% and 8% Cu had a single-phase FCC structure, and a weak BCC peak only appeared in the (110) direction in alloys with 10% Cu. A universal testing machine was used for testing at the strain rates of [Formula: see text][Formula: see text]s[Formula: see text], [Formula: see text][Formula: see text]s[Formula: see text], and [Formula: see text][Formula: see text]s[Formula: see text], and the high strain rate was tested using a split Hopkinson pressure bar (SHPB) under strain at 3000[Formula: see text]s[Formula: see text], 4000[Formula: see text]s[Formula: see text], and 5000[Formula: see text]s[Formula: see text], respectively. The specimens did not fracture during the quasi-static compression and dynamic impact tests, which displayed better ductility. The surface of the three alloys had extensive dendrites and non-equiaxed crystal structures. In an EDS composition analysis, the Cr and V elements were more frequently observed in the intergranular region than in the interdendritic region.","PeriodicalId":503716,"journal":{"name":"Modern Physics Letters B","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140362394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-26DOI: 10.1142/s0217984924502324
I. I. Aliyev, R. M. Rzayev, Kh. M. Hashimov, C. Ahmedova, T. Naghiyev
Glass formation and the nature of the chemical interaction in the As2Se3–Tl2Te3 system were studied by differential-thermal (DTA), X-ray phase (XRD), microstructural (MSA) analysis. Based on the performed experiments T-x phase diagram is constructed. It is established that the phase diagram of the system is a partially quasi-binary section of the quaternary system Tl,As//Se,Te. Eutectic equilibrium and peritectic transformation process occur in the system. When the ratio of As2Se3 and Tl2Te3 components is 1:1, a new quaternary compound Tl2As2Se3Te3 is formed. It has been established that the Tl2As2Se3Te3 compound melts with an open maximum at 568[Formula: see text]K and crystallizes in a hexagonal symmetry. In the system, under normal cooling, the glass formation area reaches −80[Formula: see text]mol.% Tl2Te3, and in the mode of quenching in liquid nitrogen up to −100[Formula: see text]mol.% T12Te3. The photoelectric properties of glassy alloys (As2Se[Formula: see text](Tl2Te[Formula: see text] ([Formula: see text]; 0.3; 0.05) have been studied. Depending on the Tl2Te3 concentration of the system, the observed changes in the photoelectric properties and calculated parameters are presented.
{"title":"An investigation of structural, thermo-physical, and photoelectric properties of glassy As2Se3–Tl2Te3 alloys","authors":"I. I. Aliyev, R. M. Rzayev, Kh. M. Hashimov, C. Ahmedova, T. Naghiyev","doi":"10.1142/s0217984924502324","DOIUrl":"https://doi.org/10.1142/s0217984924502324","url":null,"abstract":"Glass formation and the nature of the chemical interaction in the As2Se3–Tl2Te3 system were studied by differential-thermal (DTA), X-ray phase (XRD), microstructural (MSA) analysis. Based on the performed experiments T-x phase diagram is constructed. It is established that the phase diagram of the system is a partially quasi-binary section of the quaternary system Tl,As//Se,Te. Eutectic equilibrium and peritectic transformation process occur in the system. When the ratio of As2Se3 and Tl2Te3 components is 1:1, a new quaternary compound Tl2As2Se3Te3 is formed. It has been established that the Tl2As2Se3Te3 compound melts with an open maximum at 568[Formula: see text]K and crystallizes in a hexagonal symmetry. In the system, under normal cooling, the glass formation area reaches −80[Formula: see text]mol.% Tl2Te3, and in the mode of quenching in liquid nitrogen up to −100[Formula: see text]mol.% T12Te3. The photoelectric properties of glassy alloys (As2Se[Formula: see text](Tl2Te[Formula: see text] ([Formula: see text]; 0.3; 0.05) have been studied. Depending on the Tl2Te3 concentration of the system, the observed changes in the photoelectric properties and calculated parameters are presented.","PeriodicalId":503716,"journal":{"name":"Modern Physics Letters B","volume":"171 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140428835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-26DOI: 10.1142/s0217984924502476
Junaid Khalid, S. Z. Abbas, H. H. Shah, J. El Ghoul, Mayeen Uddin Khandaker
This work presents an anisotropic cylindrical source’s gravitational expansion and collapse with the cosmological constant. For this purpose, we use the cylindrical symmetric metric and energy–momentum tensor to achieve Einstein’s field equation component. The mass function is also used to assess the state of the trapped surface. The parametric form of the auxiliary solution is discovered. These presumptions enable us to examine the parameter range at the positive and negative expansion scalar transitions. The generated solution produces expanding and collapsing solutions correspondingly for positive and negative parameter values. A dimensionless measure of anisotropy, pressures and energy density are utilized as physical quantities. The included parameters are shown graphically. The cosmological constant has impacted both the expansion and collapse solutions to phenomena.
{"title":"Gravitational expansion and collapse of anisotropic cylindrical source with cosmological constant","authors":"Junaid Khalid, S. Z. Abbas, H. H. Shah, J. El Ghoul, Mayeen Uddin Khandaker","doi":"10.1142/s0217984924502476","DOIUrl":"https://doi.org/10.1142/s0217984924502476","url":null,"abstract":"This work presents an anisotropic cylindrical source’s gravitational expansion and collapse with the cosmological constant. For this purpose, we use the cylindrical symmetric metric and energy–momentum tensor to achieve Einstein’s field equation component. The mass function is also used to assess the state of the trapped surface. The parametric form of the auxiliary solution is discovered. These presumptions enable us to examine the parameter range at the positive and negative expansion scalar transitions. The generated solution produces expanding and collapsing solutions correspondingly for positive and negative parameter values. A dimensionless measure of anisotropy, pressures and energy density are utilized as physical quantities. The included parameters are shown graphically. The cosmological constant has impacted both the expansion and collapse solutions to phenomena.","PeriodicalId":503716,"journal":{"name":"Modern Physics Letters B","volume":"70 S28","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140429657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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