H. Banouni, Nabil Khatib, E. Ouacha, B. Faiz, I. Aboudaoud, H. Mesbah
A newly developed ultrasound method that acquires at the same time both reflected and transmitted P-waves, at different angles, using two immersion transducers of 0.5 MHz central frequency, is described in this present study. This non-destructive method allows calculating the longitudinal and transverse velocities, and thus, the Young modulus, so that its evolutions is followed in time domain. The closely correlation between the evolution in time domain of those calculated parameters and hydration properties of cement based materials was used to characterize the effects of different water-cement ratio and curing temperatures on early age hydration behaviour of cement pastes. To do so, cement samples were prepared by mixing Portland cement and freshwater. Results indicates that lower water to cement ratio reduces the workability and increases the Young modulus of resulted cement medium. Also, both ultrasound velocities and Young modulus values increases linearly with increasing curing temperature.
{"title":"Ultrasound Non-Destructive Characterization of Early Hydration of Cement Pastes: The Effects of Water-Cement Ratio and Curing Temperature","authors":"H. Banouni, Nabil Khatib, E. Ouacha, B. Faiz, I. Aboudaoud, H. Mesbah","doi":"10.18280/acsm.460604","DOIUrl":"https://doi.org/10.18280/acsm.460604","url":null,"abstract":"A newly developed ultrasound method that acquires at the same time both reflected and transmitted P-waves, at different angles, using two immersion transducers of 0.5 MHz central frequency, is described in this present study. This non-destructive method allows calculating the longitudinal and transverse velocities, and thus, the Young modulus, so that its evolutions is followed in time domain. The closely correlation between the evolution in time domain of those calculated parameters and hydration properties of cement based materials was used to characterize the effects of different water-cement ratio and curing temperatures on early age hydration behaviour of cement pastes. To do so, cement samples were prepared by mixing Portland cement and freshwater. Results indicates that lower water to cement ratio reduces the workability and increases the Young modulus of resulted cement medium. Also, both ultrasound velocities and Young modulus values increases linearly with increasing curing temperature.","PeriodicalId":7877,"journal":{"name":"Annales de Chimie - Science des Matériaux","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81979583","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}
New glasses in the system (80-x) Sb2O3-10WO3-10Li2O co-doped with Bi3+/Er3+ were synthesized using the melt quenching method. The Er3+ concentration was kept constant at 0.25 (mol. %) and the Bi2O3 content takes the values 0.5, 1, 1.5 and 2 (mol. %) in order to elucidate the effect of the Bi2O3 concentration on the measured physical and optical properties of the glasses studied. The pulse echo method of the propagation of ultrasound in these glasses has been used to determine the elastic modules (E, G, K and L) and Poisson ratio. The introduction of Bi2O3 in these glasses increases the thermal stability factor of the glass from 152 to 183°C with an increase in Tg from 275 to 285°C. The UV-Vis cutoff of these glasses redshifts from 408 to 413 nm with a reduction of the indirect band gap from 2.72 to 2.62 ev and a small Urbach energy close to 0.125 nm resulting in small electronic defects in these glasses. The refraction index was found high with small variations in the range [1.965-1.975]. The emission spectra of Er3+ ions in these glasses gave an intense green laser line at 544 nm for an excitation at 488 nm. Moreover, the addition of more Bi2O3, considerably improves this laser line. However, the OH content in these glasses increases with the increase in Bismuth content related probably to the introduction of atmosphere moisture during the synthesis of these glasses. Therefore, the addition of Bi2O3 improves the various physical properties of these glasses making them good candidates for optical applications.
{"title":"Effect of Bi2O3 on Physical and Luminescence Properties of Unconventional Bi/Er Co-Doped Sb2O3-WO3-Li2O Glasses","authors":"Abdelhakim Bedra, M. Soltani","doi":"10.18280/acsm.460601","DOIUrl":"https://doi.org/10.18280/acsm.460601","url":null,"abstract":"New glasses in the system (80-x) Sb2O3-10WO3-10Li2O co-doped with Bi3+/Er3+ were synthesized using the melt quenching method. The Er3+ concentration was kept constant at 0.25 (mol. %) and the Bi2O3 content takes the values 0.5, 1, 1.5 and 2 (mol. %) in order to elucidate the effect of the Bi2O3 concentration on the measured physical and optical properties of the glasses studied. The pulse echo method of the propagation of ultrasound in these glasses has been used to determine the elastic modules (E, G, K and L) and Poisson ratio. The introduction of Bi2O3 in these glasses increases the thermal stability factor of the glass from 152 to 183°C with an increase in Tg from 275 to 285°C. The UV-Vis cutoff of these glasses redshifts from 408 to 413 nm with a reduction of the indirect band gap from 2.72 to 2.62 ev and a small Urbach energy close to 0.125 nm resulting in small electronic defects in these glasses. The refraction index was found high with small variations in the range [1.965-1.975]. The emission spectra of Er3+ ions in these glasses gave an intense green laser line at 544 nm for an excitation at 488 nm. Moreover, the addition of more Bi2O3, considerably improves this laser line. However, the OH content in these glasses increases with the increase in Bismuth content related probably to the introduction of atmosphere moisture during the synthesis of these glasses. Therefore, the addition of Bi2O3 improves the various physical properties of these glasses making them good candidates for optical applications.","PeriodicalId":7877,"journal":{"name":"Annales de Chimie - Science des Matériaux","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87503236","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}
N. Kalkoul, N. Boussouf, Saadia Mahjoub, Hadda Sahraoui, M. Mosbah, S. P. Altintas, N. S. Koc
The effect of magnesium on the microstructural and superconducting characteristics of bulk Bi2Sr2CaCu2MgxOy superconductors with x=0 to 0.05 by solid reaction has been examined in this study. Bi2Sr2CaCu2O8+d is formed as the primary phase, and Bi2Sr2CuO6+d (Bi-2201) is present as the parasitic phase, according to XRD data. In doped samples, the c lattice parameter decreases, indicating that Mg has entered the Bi2Sr2CaCu2O8+d crystallographic unit cell. The grain morphology of the samples containing magnesium has changed significantly, and the lamellar structure typical of high temperature superconductors can be seen in the SEM micrographs. The critical temperatures, Tcoff and Tconset, are raised by the addition of Mg, delimiting the superconductive transition. Tconset's maximum value corresponds to x = 0.05.
{"title":"Addition Effects of MgO on Structure and Physical Properties in Bi-2212 Ceramics","authors":"N. Kalkoul, N. Boussouf, Saadia Mahjoub, Hadda Sahraoui, M. Mosbah, S. P. Altintas, N. S. Koc","doi":"10.18280/acsm.460602","DOIUrl":"https://doi.org/10.18280/acsm.460602","url":null,"abstract":"The effect of magnesium on the microstructural and superconducting characteristics of bulk Bi2Sr2CaCu2MgxOy superconductors with x=0 to 0.05 by solid reaction has been examined in this study. Bi2Sr2CaCu2O8+d is formed as the primary phase, and Bi2Sr2CuO6+d (Bi-2201) is present as the parasitic phase, according to XRD data. In doped samples, the c lattice parameter decreases, indicating that Mg has entered the Bi2Sr2CaCu2O8+d crystallographic unit cell. The grain morphology of the samples containing magnesium has changed significantly, and the lamellar structure typical of high temperature superconductors can be seen in the SEM micrographs. The critical temperatures, Tcoff and Tconset, are raised by the addition of Mg, delimiting the superconductive transition. Tconset's maximum value corresponds to x = 0.05.","PeriodicalId":7877,"journal":{"name":"Annales de Chimie - Science des Matériaux","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73286071","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}
S. M. Oleiwi, J. L. Abbas, Y. M. Hameed, A. Mohammed, A. Hussein
Nowadays, geopolymer plays a significant role in developing eco-friendly materials to avoid the pollution caused by the Portland cement industry. Geopolymer is a developed industrial by-product-based alternative concrete binder. The aim of this study to evaluate the effect of different proportions of Fly Ash (FA) and Ground Granulated Blast Furnace Slag (GGBFS) on the strength properties of geopolymer mortar. In this study, GGBFS was added as 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% of the total binder with NaOH concentrations 12 M and sodium silicate to sodium hydroxide ratio 2.5. The compressive strength was investigated experimentally in this study. The combination of FA and GGBFS were tested in a total of eleven geopolymer mix mortars, and the results show that combining the above constituents at 70℃ improves the compressive strength of geopolymer mortar. The result show that the mixture with 100% GGBFS replacement have maximum compressive strength (78.25 MPa) at 7-days age.
{"title":"Effect of Different Proportions of Fly Ash and GGBFS on the Compressive Strength of Geopolymer Mortar","authors":"S. M. Oleiwi, J. L. Abbas, Y. M. Hameed, A. Mohammed, A. Hussein","doi":"10.18280/acsm.460501","DOIUrl":"https://doi.org/10.18280/acsm.460501","url":null,"abstract":"Nowadays, geopolymer plays a significant role in developing eco-friendly materials to avoid the pollution caused by the Portland cement industry. Geopolymer is a developed industrial by-product-based alternative concrete binder. The aim of this study to evaluate the effect of different proportions of Fly Ash (FA) and Ground Granulated Blast Furnace Slag (GGBFS) on the strength properties of geopolymer mortar. In this study, GGBFS was added as 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% of the total binder with NaOH concentrations 12 M and sodium silicate to sodium hydroxide ratio 2.5. The compressive strength was investigated experimentally in this study. The combination of FA and GGBFS were tested in a total of eleven geopolymer mix mortars, and the results show that combining the above constituents at 70℃ improves the compressive strength of geopolymer mortar. The result show that the mixture with 100% GGBFS replacement have maximum compressive strength (78.25 MPa) at 7-days age.","PeriodicalId":7877,"journal":{"name":"Annales de Chimie - Science des Matériaux","volume":"173 2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78309981","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}
Creep at high temperature leads to gradual deformation under constant loads. In this paper, a comparative study of the fatigue effect of stainless steel and low carbon steel was made, whereby each sample had a constant weight of 24 kg and the experiments on elongation were performed at temperatures 660℃, 700℃, and 740℃ at a constant time of 10 minutes for each experiment. It was found that the highest elongation rate found to be 0.76% for stainless steel metal at a temperature of 740℃. On the other hand, the amount of elongation for low-carbon steel metal at the same temperature found to be 1.9%. This difference in the amount of elongation observed due to the difference in the microstructure of the two metals. The hardness test showed that the maximum value for stainless steel specimens found to be 225 BHN at 660℃, while for low carbon steel specimens 106BHN at 660℃.
{"title":"Comparative Study on the Elongation of Low-Carbon Steel and Stainless Steel at Different Creep Temperatures","authors":"N. J. Mahmood, A. A. Hussein, A. Hasan, O. Ali","doi":"10.18280/acsm.460503","DOIUrl":"https://doi.org/10.18280/acsm.460503","url":null,"abstract":"Creep at high temperature leads to gradual deformation under constant loads. In this paper, a comparative study of the fatigue effect of stainless steel and low carbon steel was made, whereby each sample had a constant weight of 24 kg and the experiments on elongation were performed at temperatures 660℃, 700℃, and 740℃ at a constant time of 10 minutes for each experiment. It was found that the highest elongation rate found to be 0.76% for stainless steel metal at a temperature of 740℃. On the other hand, the amount of elongation for low-carbon steel metal at the same temperature found to be 1.9%. This difference in the amount of elongation observed due to the difference in the microstructure of the two metals. The hardness test showed that the maximum value for stainless steel specimens found to be 225 BHN at 660℃, while for low carbon steel specimens 106BHN at 660℃.","PeriodicalId":7877,"journal":{"name":"Annales de Chimie - Science des Matériaux","volume":"81 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89080543","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}
This paper investigates the mechanical properties of the geopolymer concrete using a moderately low alkali activator. The main objective is to ascertain the compressive strength, split tensile strength, elastic modulus, shear strength, flexural strength and bond strength of the said concrete. The experimental program was carried out by reviewing the variables, namely, the amount of alkaline activator which was set at 4%, and the ratio of alkali activator to fly ash (AA/FA) which was varied from 0.35, 0.4, 0.5 to 0.6. Experimental results show that the geopolymer concrete with 4% alkaline activator could still produce concrete compressive strength above 19 MPa for AA/FA ratio of 0.6 and with treatment at room temperature (33℃). On this basis, the authors derived the empirical equations for geopolymer concrete containing low alkaline activator. These equations were compared with the mechanical property model of geopolymer concrete and that of concrete containing Portland cement. The comparison shows that our model has almost the same trend as the other models.
{"title":"Mechanical Properties of Geopolymer Concrete Containing Low-Alkaline Activator","authors":"E. S. Romadhon, Antonius, Sumirin","doi":"10.18280/acsm.460506","DOIUrl":"https://doi.org/10.18280/acsm.460506","url":null,"abstract":"This paper investigates the mechanical properties of the geopolymer concrete using a moderately low alkali activator. The main objective is to ascertain the compressive strength, split tensile strength, elastic modulus, shear strength, flexural strength and bond strength of the said concrete. The experimental program was carried out by reviewing the variables, namely, the amount of alkaline activator which was set at 4%, and the ratio of alkali activator to fly ash (AA/FA) which was varied from 0.35, 0.4, 0.5 to 0.6. Experimental results show that the geopolymer concrete with 4% alkaline activator could still produce concrete compressive strength above 19 MPa for AA/FA ratio of 0.6 and with treatment at room temperature (33℃). On this basis, the authors derived the empirical equations for geopolymer concrete containing low alkaline activator. These equations were compared with the mechanical property model of geopolymer concrete and that of concrete containing Portland cement. The comparison shows that our model has almost the same trend as the other models.","PeriodicalId":7877,"journal":{"name":"Annales de Chimie - Science des Matériaux","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79165066","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}
The main objective of this work is the synthesis, structural and morphological characterization of ceramics materials. Abbreviated PZT-PYN. Ferroelectric ceramics of general formulation Pb(ZrxTi1-x)O3 are massively used in many fields such as medicine or aeronautics because of their dielectric and electromechanical properties, although the electronic properties of doped PZT are much better compared to undoped PZT. Samples selected for this study were prepared bins solid way. The thermal treatment called calcination was applied to these compositions is carried around: 450℃, 550℃, 650℃, 750℃, and 900℃ for two hours with a Vitesse of 2℃ / min., then sintered at different temperatures: 1100℃, 1150℃, 1180℃, successively to optimize the sintering temperature where the product is better physical quality. Different techniques of characterization were used such as scanning electron microscopy (SEM), x-ray diffraction (XRD) analysis, and Energy-dispersive spectrometric, which showed that the response is optimal for the compositions included in the morphotropic phase boundary, achieves excellent properties.
{"title":"The Formation of Doped PZT Solid Solution and Its Structural Characterization","authors":"K. O. Keltoum, L. Zenkhri, A. Boutarfaia","doi":"10.18280/acsm.460507","DOIUrl":"https://doi.org/10.18280/acsm.460507","url":null,"abstract":"The main objective of this work is the synthesis, structural and morphological characterization of ceramics materials. Abbreviated PZT-PYN. Ferroelectric ceramics of general formulation Pb(ZrxTi1-x)O3 are massively used in many fields such as medicine or aeronautics because of their dielectric and electromechanical properties, although the electronic properties of doped PZT are much better compared to undoped PZT. Samples selected for this study were prepared bins solid way. The thermal treatment called calcination was applied to these compositions is carried around: 450℃, 550℃, 650℃, 750℃, and 900℃ for two hours with a Vitesse of 2℃ / min., then sintered at different temperatures: 1100℃, 1150℃, 1180℃, successively to optimize the sintering temperature where the product is better physical quality. Different techniques of characterization were used such as scanning electron microscopy (SEM), x-ray diffraction (XRD) analysis, and Energy-dispersive spectrometric, which showed that the response is optimal for the compositions included in the morphotropic phase boundary, achieves excellent properties.","PeriodicalId":7877,"journal":{"name":"Annales de Chimie - Science des Matériaux","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91393448","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}
N. Khaldi, Leila Kherraf, Assia Aidoud, M. Bencheikh, M. Belachia, Selma Benhamida, Rayane Dokhane
{"title":"Effect of the Incorporation of Recycled Rubber Aggregates on the Behavior of Self-Compacting Concrete","authors":"N. Khaldi, Leila Kherraf, Assia Aidoud, M. Bencheikh, M. Belachia, Selma Benhamida, Rayane Dokhane","doi":"10.18280/acsm.460504","DOIUrl":"https://doi.org/10.18280/acsm.460504","url":null,"abstract":"","PeriodicalId":7877,"journal":{"name":"Annales de Chimie - Science des Matériaux","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81505925","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}
The granulated blast furnace slag exhibits pozzolanic reactivity when combined with appropriate activator and can be used in a wide range as cement replacement. The aim of this study is to investigate the effect on the mechanical and microstructure properties of incorporating admixture composed by granulated blast furnace slag (GBFS), calcined eggshell (CES), and brick waste (BW), as replacement of cement in the formulation of mortar. Ten different mixes of mortar prismatic specimens were tested with different replacement levels of raw materials (50, 75, and 100%). The results show that the increase in the proportion of raw materials decreases significantly drying shrinkage, dry unit weight and strengths of mixtures mortar compared to control mortar at early age. The decrease in strengths is less important in the long term due the development of pozzolanic reaction. Moreover, the water absorption and open porosity were increased for all cases. The microscopic analysis by Scanning Electron Microscopy (SEM) shows that the proportion of 15% of calcined eggshell powder in admixture, provides more Calcium Silicate Hydrate gel (C-S-H) in the internal cementitious matrix of the mortar, which explains the best mechanical strength provided by this mixture.
{"title":"Development of Eco-Friendly Mortars Produced with Blast Furnace Slag, Calcined Eggshell and Brick Waste: Mechanical Behavior and Microstructure Assessment","authors":"Salima Boukour, F. Bouteldja, E. Bensaifi","doi":"10.18280/acsm.460502","DOIUrl":"https://doi.org/10.18280/acsm.460502","url":null,"abstract":"The granulated blast furnace slag exhibits pozzolanic reactivity when combined with appropriate activator and can be used in a wide range as cement replacement. The aim of this study is to investigate the effect on the mechanical and microstructure properties of incorporating admixture composed by granulated blast furnace slag (GBFS), calcined eggshell (CES), and brick waste (BW), as replacement of cement in the formulation of mortar. Ten different mixes of mortar prismatic specimens were tested with different replacement levels of raw materials (50, 75, and 100%). The results show that the increase in the proportion of raw materials decreases significantly drying shrinkage, dry unit weight and strengths of mixtures mortar compared to control mortar at early age. The decrease in strengths is less important in the long term due the development of pozzolanic reaction. Moreover, the water absorption and open porosity were increased for all cases. The microscopic analysis by Scanning Electron Microscopy (SEM) shows that the proportion of 15% of calcined eggshell powder in admixture, provides more Calcium Silicate Hydrate gel (C-S-H) in the internal cementitious matrix of the mortar, which explains the best mechanical strength provided by this mixture.","PeriodicalId":7877,"journal":{"name":"Annales de Chimie - Science des Matériaux","volume":"371 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75511953","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}
Micromachining techniques are now being used more frequently as a result of miniaturization. This technique has been supported by the requirement for material processing at an affordable cost and microatomic resolution in numerous sectors. Laser micromachining is a precise, non-contact method of machining that is used to create tiny, up to 500 m, components. The small elemental areas are the focus of laser ablation, which helps absorb a high amount of energy. In this micro-machining, metal removal rate and surface finish are represented by the deepness of the groove and the height of the recast layer. While machining, a layer called a recast layer forms on the work piece surface as a result of the tremendous heat generated, and this layer is damaging to the component's surface quality. For accurate applications, the recast layer must be as tiny as possible. As a result, the objective functions are the height of the recast layer and the deepness of the groove. Experiments designed by the DOE are used to generate empirical models. For each experimental run present in the matrix, the specified input parameter combination is set and the work piece is machined accordingly. The response surface methodology based on mathematical modeling and analysis of the machining properties of a pulsed Nd: YAG laser during micro-grooving operation on a work piece of Magnesium Silicon Alloy metal matrix composite is the focus of this research study. Initially, magnesium alloy AS21-SiC metal matrix composites are manufactured with Ultrasonic pro assisted stir casting. For the machined samples, the deepness of the groove and the height of recast layer will be measured by an optical measuring microscope. Consequently, the measured data is used by the GP to develop the mathematical models. In this work, an efficient GA-based genetic algorithm (NSGA-II) is applied to obtain the optimal parameters. As the chosen objectives are conflicting in nature, the problem is formulated as a multi-objective optimization problem.
{"title":"Empirical Modelling and Multi-Objective Optimisation of Laser Micro Machining on Magnesium Alloy AS21-SiC Metal Matrix Composite","authors":"D. R. Rao, C. Srinivas","doi":"10.18280/acsm.460505","DOIUrl":"https://doi.org/10.18280/acsm.460505","url":null,"abstract":"Micromachining techniques are now being used more frequently as a result of miniaturization. This technique has been supported by the requirement for material processing at an affordable cost and microatomic resolution in numerous sectors. Laser micromachining is a precise, non-contact method of machining that is used to create tiny, up to 500 m, components. The small elemental areas are the focus of laser ablation, which helps absorb a high amount of energy. In this micro-machining, metal removal rate and surface finish are represented by the deepness of the groove and the height of the recast layer. While machining, a layer called a recast layer forms on the work piece surface as a result of the tremendous heat generated, and this layer is damaging to the component's surface quality. For accurate applications, the recast layer must be as tiny as possible. As a result, the objective functions are the height of the recast layer and the deepness of the groove. Experiments designed by the DOE are used to generate empirical models. For each experimental run present in the matrix, the specified input parameter combination is set and the work piece is machined accordingly. The response surface methodology based on mathematical modeling and analysis of the machining properties of a pulsed Nd: YAG laser during micro-grooving operation on a work piece of Magnesium Silicon Alloy metal matrix composite is the focus of this research study. Initially, magnesium alloy AS21-SiC metal matrix composites are manufactured with Ultrasonic pro assisted stir casting. For the machined samples, the deepness of the groove and the height of recast layer will be measured by an optical measuring microscope. Consequently, the measured data is used by the GP to develop the mathematical models. In this work, an efficient GA-based genetic algorithm (NSGA-II) is applied to obtain the optimal parameters. As the chosen objectives are conflicting in nature, the problem is formulated as a multi-objective optimization problem.","PeriodicalId":7877,"journal":{"name":"Annales de Chimie - Science des Matériaux","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89313634","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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