Pub Date : 2024-07-16DOI: 10.1088/2053-1591/ad5cd5
Abhijit Kudva, Mahesha G T, Sriharsha Hegde and Dayananda Pai
In the pursuit of sustainable materials, natural fibers are gaining attention because of their renewable nature and low environmental impact. However, their application in composites has been hindered by their hydrophilicity and non-homogeneity in the properties. To address these issues, chemical treatments such as Sodium Hydroxide and Potassium Permanganate have been utilized. This study explored the impact of chemical treatments on Bamboo fibers and their subsequent influence on the vibration and acoustic properties of Carbon/Bamboo fiber-reinforced hybrid composites. This study investigates the vibration damping and acoustic characteristics of hybrid composites, considering the synergistic advantages of Bamboo’s natural damping properties and Carbon fiber’s mechanical strength. The damping factor of Sodium Hydroxide treated Bamboo fiber reinforced hybrid composites is 34.55% higher than that of untreated Bamboo fiber reinforced hybrid composites. It is also 11.95% higher than that of Potassium Permanganate treated Bamboo fiber reinforced hybrid composites. The flexural modulus of untreated Bamboo fiber reinforced hybrid composites was 164.36% and 157.77% higher than that of Sodium Hydroxide treated and Potassium Permanganate treated Bamboo fiber reinforced hybrid composites, respectively. The effect of chemical treatment on the fiber properties were analysed using the FTIR spectrum. Acoustic characterization revealed that untreated Bamboo fiber composites have higher sound absorption coefficients at lower frequencies, whereas Sodium Hydroxide-treated composites have higher sound absorption coefficients at medium and high frequencies. The results indicated that chemical treatment enhanced fiber-matrix adhesion, reduced stiffness, and influenced the damping and acoustic performance of the hybrid composites.
{"title":"Influence of chemical treatment of Bamboo fibers on the vibration and acoustic characterization of Carbon/Bamboo fiber reinforced hybrid composites","authors":"Abhijit Kudva, Mahesha G T, Sriharsha Hegde and Dayananda Pai","doi":"10.1088/2053-1591/ad5cd5","DOIUrl":"https://doi.org/10.1088/2053-1591/ad5cd5","url":null,"abstract":"In the pursuit of sustainable materials, natural fibers are gaining attention because of their renewable nature and low environmental impact. However, their application in composites has been hindered by their hydrophilicity and non-homogeneity in the properties. To address these issues, chemical treatments such as Sodium Hydroxide and Potassium Permanganate have been utilized. This study explored the impact of chemical treatments on Bamboo fibers and their subsequent influence on the vibration and acoustic properties of Carbon/Bamboo fiber-reinforced hybrid composites. This study investigates the vibration damping and acoustic characteristics of hybrid composites, considering the synergistic advantages of Bamboo’s natural damping properties and Carbon fiber’s mechanical strength. The damping factor of Sodium Hydroxide treated Bamboo fiber reinforced hybrid composites is 34.55% higher than that of untreated Bamboo fiber reinforced hybrid composites. It is also 11.95% higher than that of Potassium Permanganate treated Bamboo fiber reinforced hybrid composites. The flexural modulus of untreated Bamboo fiber reinforced hybrid composites was 164.36% and 157.77% higher than that of Sodium Hydroxide treated and Potassium Permanganate treated Bamboo fiber reinforced hybrid composites, respectively. The effect of chemical treatment on the fiber properties were analysed using the FTIR spectrum. Acoustic characterization revealed that untreated Bamboo fiber composites have higher sound absorption coefficients at lower frequencies, whereas Sodium Hydroxide-treated composites have higher sound absorption coefficients at medium and high frequencies. The results indicated that chemical treatment enhanced fiber-matrix adhesion, reduced stiffness, and influenced the damping and acoustic performance of the hybrid composites.","PeriodicalId":18530,"journal":{"name":"Materials Research Express","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141718490","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}
Pub Date : 2024-07-16DOI: 10.1088/2053-1591/ad6400
Jagadeesh C Jagadeesh, S. H, Ramesh S, Gajanan Anne
Al-Cu-Li alloys have drawn attention because of their decreased density, which is a result of the growing need for lightweight material systems in aerospace and aircraft applications. The Al-Cu-Li alloy, which has potential usage in aerospace and aviation structural components, is the subject of this study. The alloy was subjected to multi-directional forging (MDF) and post-MDF artificial aging. Reciprocating sliding wear tests were conducted to investigate the effects of these processes on wear properties under different load conditions. After MDF, a decrease in wear resistance was noticed, on the other hand, 12 pass MDF treated samples showed improved wear resistance upon aging treatment. Wear scars and counter ball surfaces were examined using scanning electron microscope (SEM) in order to understand the wear processes. The findings demonstrated that, at lower loads, adhesion and abrasion were the main wear processes; at greater loads, delamination, adhesion, and abrasion were clearly visible. Our study revealed that the MDF and its aging after processing have a substantial effect on the wear behavior of Al-Cu-Li alloy. This discovery has important implications for the development of lightweight materials that could be used in aerospace and aircraft applications.
{"title":"Reciprocating wear behavior of multi-directionally forged and aged Al-Cu-Li alloy","authors":"Jagadeesh C Jagadeesh, S. H, Ramesh S, Gajanan Anne","doi":"10.1088/2053-1591/ad6400","DOIUrl":"https://doi.org/10.1088/2053-1591/ad6400","url":null,"abstract":"\u0000 Al-Cu-Li alloys have drawn attention because of their decreased density, which is a result of the growing need for lightweight material systems in aerospace and aircraft applications. The Al-Cu-Li alloy, which has potential usage in aerospace and aviation structural components, is the subject of this study. The alloy was subjected to multi-directional forging (MDF) and post-MDF artificial aging. Reciprocating sliding wear tests were conducted to investigate the effects of these processes on wear properties under different load conditions. After MDF, a decrease in wear resistance was noticed, on the other hand, 12 pass MDF treated samples showed improved wear resistance upon aging treatment. Wear scars and counter ball surfaces were examined using scanning electron microscope (SEM) in order to understand the wear processes. The findings demonstrated that, at lower loads, adhesion and abrasion were the main wear processes; at greater loads, delamination, adhesion, and abrasion were clearly visible. Our study revealed that the MDF and its aging after processing have a substantial effect on the wear behavior of Al-Cu-Li alloy. This discovery has important implications for the development of lightweight materials that could be used in aerospace and aircraft applications.","PeriodicalId":18530,"journal":{"name":"Materials Research Express","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141640423","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}
Pub Date : 2024-07-16DOI: 10.1088/2053-1591/ad6402
Bing Wang, Hong-lin Zhang, Bin Xu, Ming-yue Sun, Dianzhong Li
Large-tube forgings were formed using nine layers of continuous-casting billet made from 15CrNi3MoV alloy steel via additive forging. The interfacial microstructural evolution under different hot-compression bonding temperatures and strains was investigated using optical microscopy, scanning electron microscopy, and electron backscatter diffraction. The tensile properties of the hot-compression-bonded and tube-forged samples were also evaluated. The results showed that as the hot-compression bonding temperature and strain increased, the bonding interface gradually disappeared and the voids at the bonding interface closed. Finally, the interface was replaced with recrystallised grains. The tensile properties of the hot-compression-bonded samples at different temperatures and strains were identical. The tensile properties of the interface and base samples of the tube forging were comparable, and the fracture morphologies were consistent. The fracture position of the large tensile sample with a length of 1000 mm containing three original interfaces is the base, indicating the complete metallurgical bonding of the forging
{"title":"Investigation on the microstructure and mechanical properties of large-tube forging manufactured by additive forging","authors":"Bing Wang, Hong-lin Zhang, Bin Xu, Ming-yue Sun, Dianzhong Li","doi":"10.1088/2053-1591/ad6402","DOIUrl":"https://doi.org/10.1088/2053-1591/ad6402","url":null,"abstract":"\u0000 Large-tube forgings were formed using nine layers of continuous-casting billet made from 15CrNi3MoV alloy steel via additive forging. The interfacial microstructural evolution under different hot-compression bonding temperatures and strains was investigated using optical microscopy, scanning electron microscopy, and electron backscatter diffraction. The tensile properties of the hot-compression-bonded and tube-forged samples were also evaluated. The results showed that as the hot-compression bonding temperature and strain increased, the bonding interface gradually disappeared and the voids at the bonding interface closed. Finally, the interface was replaced with recrystallised grains. The tensile properties of the hot-compression-bonded samples at different temperatures and strains were identical. The tensile properties of the interface and base samples of the tube forging were comparable, and the fracture morphologies were consistent. The fracture position of the large tensile sample with a length of 1000 mm containing three original interfaces is the base, indicating the complete metallurgical bonding of the forging","PeriodicalId":18530,"journal":{"name":"Materials Research Express","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141640794","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}
Pub Date : 2024-07-16DOI: 10.1088/2053-1591/ad6401
Omar A Thabet, Salsabeel Al-Sodies, Ahmed Al Zahrani, Atheer A. Alqahtani, Khalid A Alamry, Mahmoud Hussein Abdo, Richard Hoogenboom
In this study, a new eco-friendly carbon nanohybrids was developed by hybridizing carboxymethyl cellulose (CMC) biopolymer with various amounts of multi-walled carbon nanotubes (MWCNTs: 0.2, 0.5, 1, 3, and 5%) to produce hydrophobic CMC–C18@MWCNTs, which was then used as a sorbent material for fat content in fatty food samples analysis. The hydrophobic biopolymers were synthesized using an ultrasound-assisted esterification process, and the physicochemical properties were analyzed using FT-IR, XRD, TGA, FE-SEM, and TEM. The performance of the hydrophobic nanocomposites was evaluated by assessing their ability to remove fat content during polycyclic aromatic hydrocarbon (PAHs) analysis in tuna samples. The results showed that CMC–C18–CNT0.2% provided the best peak shapes and highest recoveries for PAHs compounds, ranging between 74.3 and 89.7%, while CMC–C18–CNT5% had the lowest recoveries, ranging between 0 and 35%. Therefore, the lowest amount of MWCNTs was found to be the most efficient for removing fat content with providing high PAHs recovery, while increasing the MWCNTs percentage increased the hydrophobicity and removed PAHs analytes along with fat content. After the investigation, the method was validated using CMC–C18–CNT0.2% in three various levels: 2, 5 and 10 µg/kg. The obtained results were satisfactory; the average recoveries for all PAHs compounds ranged between 74.3 to 89.7%, and the intra-day precision were estimated by coefficient of variation (%CV), where were less than 10% for all PAHs. The LOD and LOQ were lies between 0.33 to 0.89 µg/kg and 1.12 to 1.92 µg/kg respectively. For the calibration curve linearity, the correlation coefficient (r2) were higher than 0.999 for all PAHs. Overall, the hydrophobic CMC–C18@MWCNTs are a promising, modifiable, and useful material for fatty food analysis.
{"title":"Eco-Friendly Fabrication of Novel Hydrophobic CMC–C18@MWCNTs Nano-Sorbent for fat content removal in the analysis of Polycyclic Aromatic Hydrocarbons in Fatty-Food Samples","authors":"Omar A Thabet, Salsabeel Al-Sodies, Ahmed Al Zahrani, Atheer A. Alqahtani, Khalid A Alamry, Mahmoud Hussein Abdo, Richard Hoogenboom","doi":"10.1088/2053-1591/ad6401","DOIUrl":"https://doi.org/10.1088/2053-1591/ad6401","url":null,"abstract":"\u0000 In this study, a new eco-friendly carbon nanohybrids was developed by hybridizing carboxymethyl cellulose (CMC) biopolymer with various amounts of multi-walled carbon nanotubes (MWCNTs: 0.2, 0.5, 1, 3, and 5%) to produce hydrophobic CMC–C18@MWCNTs, which was then used as a sorbent material for fat content in fatty food samples analysis. The hydrophobic biopolymers were synthesized using an ultrasound-assisted esterification process, and the physicochemical properties were analyzed using FT-IR, XRD, TGA, FE-SEM, and TEM. The performance of the hydrophobic nanocomposites was evaluated by assessing their ability to remove fat content during polycyclic aromatic hydrocarbon (PAHs) analysis in tuna samples. The results showed that CMC–C18–CNT0.2% provided the best peak shapes and highest recoveries for PAHs compounds, ranging between 74.3 and 89.7%, while CMC–C18–CNT5% had the lowest recoveries, ranging between 0 and 35%. Therefore, the lowest amount of MWCNTs was found to be the most efficient for removing fat content with providing high PAHs recovery, while increasing the MWCNTs percentage increased the hydrophobicity and removed PAHs analytes along with fat content. After the investigation, the method was validated using CMC–C18–CNT0.2% in three various levels: 2, 5 and 10 µg/kg. The obtained results were satisfactory; the average recoveries for all PAHs compounds ranged between 74.3 to 89.7%, and the intra-day precision were estimated by coefficient of variation (%CV), where were less than 10% for all PAHs. The LOD and LOQ were lies between 0.33 to 0.89 µg/kg and 1.12 to 1.92 µg/kg respectively. For the calibration curve linearity, the correlation coefficient (r2) were higher than 0.999 for all PAHs. Overall, the hydrophobic CMC–C18@MWCNTs are a promising, modifiable, and useful material for fatty food analysis.","PeriodicalId":18530,"journal":{"name":"Materials Research Express","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141642028","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}
Present work analyze the ionizing radiations attenuation behaviour, photon trajectories and dose rate reduction properties of silver tellurite glasses to investigate their potential application in radiation shielding. The shielding capability of five glass systems with different elemental compositions have been calculated with the help of theoretical software: Phy-X/PSD and NIST XCOM. For the photon energy range of 1.00 keV to 100.00 GeV, various shielding parameters are calculated, including attenuation coefficients ($MAC$, $LAC$), mean free path, half value layer, tenth value layer, effective atomic number, effective electron density, energy build up factors, energy absorption buildup factors, and fast neutron removal cross section. While the energy stopping potentials, projected range of ions (H$^{+}$, He$^{+}$, and C$^{+}$) has been presented with the help of SRIM software. Additionally photon trajectories and dose rate attenuating behavior of 10$^5$ photons generated from $^{137}$Cs and $^{60}$Co sources with activity 200.00 GBq has been studied with the help of particle and heavy ion transport (PHITS) code. It is observed that at both low and high energy levels, the glass composition, labelled S$_4$, (70TeO$_{2}$-25Ag$_2$O-2Nb$_{2}$O$_5$-2BaO-1PbO), exhibits comparable attenuation coefficients to previously recommended glass samples for radiation shielding applications. In addition to S$_4$, nine different types of glass samples and polymers with comparable densities to our glass sample, along with water, were included for comparison. The findings indicate that among all the samples tested, S$_4$ demonstrates the highest and comparable radiation-protective performance, positioning it favourably for such applications.
{"title":"Behavior of silver tellurite glasses against gamma rays, neutrons, and ions using theoretical and the PHITS Monte Carlo method","authors":"Apsara Dulal, Devendra Raj Upadhyay, Suffian Mohamad Tajudin, Raju Khanal","doi":"10.1088/2053-1591/ad63fe","DOIUrl":"https://doi.org/10.1088/2053-1591/ad63fe","url":null,"abstract":"\u0000 Present work analyze the ionizing radiations attenuation behaviour, photon trajectories and dose rate reduction properties of silver tellurite glasses to investigate their potential application in radiation shielding. The shielding capability of five glass systems with different elemental compositions have been calculated with the help of theoretical software: Phy-X/PSD and NIST XCOM. For the photon energy range of 1.00 keV to 100.00 GeV, various shielding parameters are calculated, including attenuation coefficients ($MAC$, $LAC$), mean free path, half value layer, tenth value layer, effective atomic number, effective electron density, energy build up factors, energy absorption buildup factors, and fast neutron removal cross section. While the energy stopping potentials, projected range of ions (H$^{+}$, He$^{+}$, and C$^{+}$) has been presented with the help of SRIM software. Additionally photon trajectories and dose rate attenuating behavior of 10$^5$ photons generated from $^{137}$Cs and $^{60}$Co sources with activity 200.00 GBq has been studied with the help of particle and heavy ion transport (PHITS) code. It is observed that at both low and high energy levels, the glass composition, labelled S$_4$, (70TeO$_{2}$-25Ag$_2$O-2Nb$_{2}$O$_5$-2BaO-1PbO), exhibits comparable attenuation coefficients to previously recommended glass samples for radiation shielding applications. In addition to S$_4$, nine different types of glass samples and polymers with comparable densities to our glass sample, along with water, were included for comparison. The findings indicate that among all the samples tested, S$_4$ demonstrates the highest and comparable radiation-protective performance, positioning it favourably for such applications.","PeriodicalId":18530,"journal":{"name":"Materials Research Express","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141642763","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}
Pub Date : 2024-07-16DOI: 10.1088/2053-1591/ad59ee
Moges Tsega Yihunie
Undoped and zinc-doped TiO2 nanoparticles (NPs) were synthesized by the sol–gel method. The XRD spectra revealed that both synthesized undoped and Zn-doped TiO2 NPs remain in the anatase phase after calcined at 500 °C. The crystallite size was increased from 17 to 52 nm as the Zn content was increased from 0 to 0.2 mol%, which implies also a decrease of the micro-strain and surface area. The agglomerated spherical-like morphology with a diameter of roughly 10–20 nm was shown by SEM and TEM micrographs. The bandgap values were found to be decreased from 3.2 to 3.0 eV when Zn concentration increased from 0 to 0.2 mol%. A reduction in bandgap with an increase in dopant concentration may due to the increased in crystallite size along with enhanced lattice parameters (i.e., a and c) and d-spacing. From PL spectra, all samples exhibited a broad emission band in the visible region of about 400–500 nm centered at 430 nm. The highest PL emission was obtained for 0.2 mol% Zn doping. The broad PL emission over the visible range is greatly reduced at 0.4 mol% Zn due to concentration quenching. It is suggested that the Zn2+ doping induced oxygen vacancies which could promote the photoluminescence processes.
{"title":"Enhanced photoluminescence and structural properties of Zn-doped anatase TiO2 nanoparticles","authors":"Moges Tsega Yihunie","doi":"10.1088/2053-1591/ad59ee","DOIUrl":"https://doi.org/10.1088/2053-1591/ad59ee","url":null,"abstract":"Undoped and zinc-doped TiO2 nanoparticles (NPs) were synthesized by the sol–gel method. The XRD spectra revealed that both synthesized undoped and Zn-doped TiO2 NPs remain in the anatase phase after calcined at 500 °C. The crystallite size was increased from 17 to 52 nm as the Zn content was increased from 0 to 0.2 mol%, which implies also a decrease of the micro-strain and surface area. The agglomerated spherical-like morphology with a diameter of roughly 10–20 nm was shown by SEM and TEM micrographs. The bandgap values were found to be decreased from 3.2 to 3.0 eV when Zn concentration increased from 0 to 0.2 mol%. A reduction in bandgap with an increase in dopant concentration may due to the increased in crystallite size along with enhanced lattice parameters (i.e., a and c) and d-spacing. From PL spectra, all samples exhibited a broad emission band in the visible region of about 400–500 nm centered at 430 nm. The highest PL emission was obtained for 0.2 mol% Zn doping. The broad PL emission over the visible range is greatly reduced at 0.4 mol% Zn due to concentration quenching. It is suggested that the Zn2+ doping induced oxygen vacancies which could promote the photoluminescence processes.","PeriodicalId":18530,"journal":{"name":"Materials Research Express","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141718491","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}
Pub Date : 2024-07-14DOI: 10.1088/2053-1591/ad5a68
M V Sorokin, Zh B Malikova, A K Dauletbekova, G Baubekova, G M Aralbayeva and A T Akilbekov
Annealing of color centers was studied in lithium fluoride crystals, irradiated with 23-MeV nitrogen and 28-MeV oxygen ions. Basing on the optical absorption spectroscopy and reaction-rate modelling, a new interpretation of the annealing kinetics at the practically important temperatures below 500 K is suggested. Proposed model explains simultaneous decrease of the F and F2/F3+ peaks as a result of migration of the F centers and formation of larger aggregates, and does not include additional assumptions about impurities and cation vacancies. It specifies the migration energy of the F centers in the ground state to be about 1.3 eV, that corresponds to earlier studies.
研究了氟化锂晶体在 23-MeV 氮离子和 28-MeV 氧离子照射下的色心退火。根据光学吸收光谱和反应速率模型，对 500 K 以下实际重要温度下的退火动力学提出了新的解释。所提出的模型解释了由于 F 中心的迁移和更大聚集体的形成，F 峰和 F2/F3+ 峰同时降低的现象，并且不包括对杂质和阳离子空位的额外假设。它将基态中 F 中心的迁移能定为约 1.3 eV，这与之前的研究结果一致。
{"title":"Thermal annealing of radiation damages produced by swift 14N and 16O ions in LiF crystals","authors":"M V Sorokin, Zh B Malikova, A K Dauletbekova, G Baubekova, G M Aralbayeva and A T Akilbekov","doi":"10.1088/2053-1591/ad5a68","DOIUrl":"https://doi.org/10.1088/2053-1591/ad5a68","url":null,"abstract":"Annealing of color centers was studied in lithium fluoride crystals, irradiated with 23-MeV nitrogen and 28-MeV oxygen ions. Basing on the optical absorption spectroscopy and reaction-rate modelling, a new interpretation of the annealing kinetics at the practically important temperatures below 500 K is suggested. Proposed model explains simultaneous decrease of the F and F2/F3+ peaks as a result of migration of the F centers and formation of larger aggregates, and does not include additional assumptions about impurities and cation vacancies. It specifies the migration energy of the F centers in the ground state to be about 1.3 eV, that corresponds to earlier studies.","PeriodicalId":18530,"journal":{"name":"Materials Research Express","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141722128","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}
A W-Zr alloy doped with ceramic powder W54.5Zr35-xNi6.7Fe3.3Mo0.5 (ZrO2) x was prepared by powder metallurgy. The effects of the ceramic content on the dynamic and static compressive mechanical behavior and energy release properties of the alloy were studied. The results showed that the addition of ceramics enhanced the energy release characteristics of the W-Zr alloy, and made the alloy break more thoroughly and the fragment cloud distribute evenly. The reaction delay time was shorter and the energy release reaction was more complete. However, the maximum temperature of the alloy reaction decreased. In addition, the addition of ceramics improves the mechanical properties of the material, and its compressive strength is much higher than that of traditional W-Zr alloys.(ZrO2)1 exhibited good mechanical behavior and energy release characteristics. The aftereffect damage performance was further verified using a ballistic gun experiment. Ballistic gun test results showed that (ZrO2) 1 can penetrate A92124 aluminum targets with a thickness of 2 mm at a speed of 809.3 m/s and ignite post-target absorbent cotton, with both penetration and post-target damage capabilities.
{"title":"Effects of ZrO2 ceramics doped with varying content on the mechanical properties and energy release characteristics of W-Zr alloys","authors":"Yuanhang Fang, Tingbian Zhan, Xiaojun Li, Changyou Xie, Xinggao Zhang, Weizhan Wang, Xiansong Jiang","doi":"10.1088/2053-1591/ad62c1","DOIUrl":"https://doi.org/10.1088/2053-1591/ad62c1","url":null,"abstract":"\u0000 A W-Zr alloy doped with ceramic powder W54.5Zr35-xNi6.7Fe3.3Mo0.5 (ZrO2) x was prepared by powder metallurgy. The effects of the ceramic content on the dynamic and static compressive mechanical behavior and energy release properties of the alloy were studied. The results showed that the addition of ceramics enhanced the energy release characteristics of the W-Zr alloy, and made the alloy break more thoroughly and the fragment cloud distribute evenly. The reaction delay time was shorter and the energy release reaction was more complete. However, the maximum temperature of the alloy reaction decreased. In addition, the addition of ceramics improves the mechanical properties of the material, and its compressive strength is much higher than that of traditional W-Zr alloys.(ZrO2)1 exhibited good mechanical behavior and energy release characteristics. The aftereffect damage performance was further verified using a ballistic gun experiment. Ballistic gun test results showed that (ZrO2) 1 can penetrate A92124 aluminum targets with a thickness of 2 mm at a speed of 809.3 m/s and ignite post-target absorbent cotton, with both penetration and post-target damage capabilities.","PeriodicalId":18530,"journal":{"name":"Materials Research Express","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141652656","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}
Pub Date : 2024-07-12DOI: 10.1088/2053-1591/ad62bb
Nagaraju Tenali, G. Ganesan, Ravindra Babu Potluri
This study focuses on the effects of a hybrid reinforcement consisting of nanosized particles of Palm Sprout Shell Ash (PSSA) and silicon carbide (SiC) on the mechanical and tribological properties of the Al-Cu-Mg alloy. Hybrid reinforced composites with different weight percentages of SiC and PSSA (0:0, 0:4, 1:3, 2:2, and 4:0 wt.%) were prepared using the ultrasonic-assisted bottom-poured stir casting technique. SEM and EDS were used to characterize the hybrid composite made of Al-Cu-Mg alloy. Optical and SEM microstructural analyses demonstrated an even distribution of SiC and PSSA nano-reinforcements within the matrix. EDS analysis revealed SiC and PSSA reinforcement in the matrix. The mechanical properties (tensile, flexural, and impact strength) and wear properties of the composites and alloy were evaluated according to the ASTM standards. The hybrid reinforced composites displayed remarkable results compared with the base alloy. Among all composites, the 2:2 wt.% SIC and PSSA hybrid reinforced composite exhibited a significant enhancement in both tensile strength and flexural strength, with a 29.15% increase in tensile strength and a 27.64% increase in flexural strength. However, the inclusion of these reinforcements led to a declined in ductility and impact strength of the Al-Cu-Mg alloy composite. Maximum reductions in ductility and impact strength were observed in the 0:4 wt.% SiC and PSSA-reinforced composites, with decreases of 47.67% and 3.56%, respectively. For the 2:2 wt.% SiC and PSSA composites, these reductions were 23.64% and 3.16%, respectively. The SEM analysis of the fractured surfaces of the composites tested for the mechanical properties revealed evidence of both ductile and brittle fracture mechanisms in the tensile, flexural, and impact tests. The wear behaviour of the prepared samples was evaluated, and all composites exhibited superior performance compared with the base alloy, demonstrating adhesive and abrasive wear mechanisms and varying coefficients of friction.
本研究的重点是纳米级棕榈芽壳灰 (PSSA) 和碳化硅 (SiC) 混合增强材料对铝铜镁合金机械和摩擦学性能的影响。采用超声波辅助底部浇注搅拌铸造技术制备了碳化硅和 PSSA 不同重量百分比（0:0、0:4、1:3、2:2 和 4:0）的混合增强复合材料。扫描电镜和 EDS 被用来表征由铝-铜-镁合金制成的混合复合材料。光学和 SEM 显微结构分析表明，SiC 和 PSSA 纳米增强材料在基体中分布均匀。EDS 分析显示基体中存在 SiC 和 PSSA 增强材料。根据 ASTM 标准对复合材料和合金的机械性能（拉伸、弯曲和冲击强度）和磨损性能进行了评估。与基体合金相比，混合增强复合材料显示出卓越的性能。在所有复合材料中，2:2 wt.% SIC 和 PSSA 混合增强复合材料的抗拉强度和抗弯强度都有显著提高，抗拉强度提高了 29.15%，抗弯强度提高了 27.64%。然而，这些增强材料的加入导致了铝铜镁合金复合材料延展性和冲击强度的下降。0:4 wt.% SiC 和 PSSA 增强复合材料的延展性和冲击强度下降幅度最大，分别为 47.67% 和 3.56%。对于 2:2 重量百分比的 SiC 和 PSSA 复合材料，降低幅度分别为 23.64% 和 3.16%。对接受机械性能测试的复合材料断裂表面进行的扫描电镜分析表明，在拉伸、弯曲和冲击测试中均存在韧性和脆性断裂机制。对制备的样品的磨损行为进行了评估，与基合金相比，所有复合材料都表现出更优越的性能，显示出粘着磨损和磨料磨损机制以及不同的摩擦系数。
{"title":"A STUDY ON THE EFFECTS OF HYBRID (SIC- PSSA) NANO SIZED REINFORCEMENT ON MECHANICAL AND TRIBOLOGICAL BEHAVIOUR OF AL ALLOY-BASED METAL MATRIX COMPOSITE PRODUCED BY ULTRASONIC ASSISTED STIR CASTING","authors":"Nagaraju Tenali, G. Ganesan, Ravindra Babu Potluri","doi":"10.1088/2053-1591/ad62bb","DOIUrl":"https://doi.org/10.1088/2053-1591/ad62bb","url":null,"abstract":"\u0000 This study focuses on the effects of a hybrid reinforcement consisting of nanosized particles of Palm Sprout Shell Ash (PSSA) and silicon carbide (SiC) on the mechanical and tribological properties of the Al-Cu-Mg alloy. Hybrid reinforced composites with different weight percentages of SiC and PSSA (0:0, 0:4, 1:3, 2:2, and 4:0 wt.%) were prepared using the ultrasonic-assisted bottom-poured stir casting technique. SEM and EDS were used to characterize the hybrid composite made of Al-Cu-Mg alloy. Optical and SEM microstructural analyses demonstrated an even distribution of SiC and PSSA nano-reinforcements within the matrix. EDS analysis revealed SiC and PSSA reinforcement in the matrix. The mechanical properties (tensile, flexural, and impact strength) and wear properties of the composites and alloy were evaluated according to the ASTM standards. The hybrid reinforced composites displayed remarkable results compared with the base alloy. Among all composites, the 2:2 wt.% SIC and PSSA hybrid reinforced composite exhibited a significant enhancement in both tensile strength and flexural strength, with a 29.15% increase in tensile strength and a 27.64% increase in flexural strength. However, the inclusion of these reinforcements led to a declined in ductility and impact strength of the Al-Cu-Mg alloy composite. Maximum reductions in ductility and impact strength were observed in the 0:4 wt.% SiC and PSSA-reinforced composites, with decreases of 47.67% and 3.56%, respectively. For the 2:2 wt.% SiC and PSSA composites, these reductions were 23.64% and 3.16%, respectively. The SEM analysis of the fractured surfaces of the composites tested for the mechanical properties revealed evidence of both ductile and brittle fracture mechanisms in the tensile, flexural, and impact tests. The wear behaviour of the prepared samples was evaluated, and all composites exhibited superior performance compared with the base alloy, demonstrating adhesive and abrasive wear mechanisms and varying coefficients of friction.","PeriodicalId":18530,"journal":{"name":"Materials Research Express","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141652609","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}
Pub Date : 2024-07-12DOI: 10.1088/2053-1591/ad62c0
Yilmaz Gur, Sare Celik, Raif Sakin
This study aims to highlight the impact of low-volume (7.5%) continuous carbon fibre reinforcement in three different polymer matrices and the effects of post-processing under hot pressing on the mechanical properties of the structures. A fused deposition modelling (FDM) printer's print head was modified to directly extrude the polymer matrix and continuous carbon fibre tow together. Both pure and carbon fibre-reinforced samples were cured under hot pressing at 100°C and 10 kN pressure for 15 minutes. All samples underwent tensile and hardness tests, and the microstructure of fractured samples was analysed using a scanning electron microscope. The results indicate that continuous carbon fibre reinforcement and hot pressing are crucial for enhancing the mechanical performance of 3D-printed objects.
{"title":"Tensile behaviour of continuous carbon fibre reinforced composites fabricated by a modified 3D printer","authors":"Yilmaz Gur, Sare Celik, Raif Sakin","doi":"10.1088/2053-1591/ad62c0","DOIUrl":"https://doi.org/10.1088/2053-1591/ad62c0","url":null,"abstract":"\u0000 This study aims to highlight the impact of low-volume (7.5%) continuous carbon fibre reinforcement in three different polymer matrices and the effects of post-processing under hot pressing on the mechanical properties of the structures. A fused deposition modelling (FDM) printer's print head was modified to directly extrude the polymer matrix and continuous carbon fibre tow together. Both pure and carbon fibre-reinforced samples were cured under hot pressing at 100°C and 10 kN pressure for 15 minutes. All samples underwent tensile and hardness tests, and the microstructure of fractured samples was analysed using a scanning electron microscope. The results indicate that continuous carbon fibre reinforcement and hot pressing are crucial for enhancing the mechanical performance of 3D-printed objects.","PeriodicalId":18530,"journal":{"name":"Materials Research Express","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141653059","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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