The deformation mechanisms and recrystallization behavior of FeGa alloy strips, prepared using twin-roll strip casting technology, were investigated. The study focused on the characteristics of deformation twins in the warm-rolled sheets and the impact of deformation microstructures on recrystallization behavior and texture evolution during subsequent heat treatment. The results indicated that the deformation mechanisms included slip induced crystal rotation, twinning, and shear deformation of the deformed grains. With the increased reduction, the number of deformation twins significantly increased and exhibited a remarkable grain orientation dependence. During annealing, twins played a crucial role in recrystallization nucleation, with Goss grain nucleation observed at twin sites, similar to shear bands. Combined with the slow heating annealing, the specimen achieved a maximum magnetostriction of 181 ppm.
{"title":"Deformation twinning feature of warm rolling and its effects on recrystallization in strip-cast Fe-Ga alloy","authors":"Zongwen Ma, Yuanxiang Zhang, Yukun Xia, Yuchen Wang, Yang Wang, Feng Fang, Xiaoming Zhang","doi":"10.1016/j.mtcomm.2024.110333","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2024.110333","url":null,"abstract":"The deformation mechanisms and recrystallization behavior of FeGa alloy strips, prepared using twin-roll strip casting technology, were investigated. The study focused on the characteristics of deformation twins in the warm-rolled sheets and the impact of deformation microstructures on recrystallization behavior and texture evolution during subsequent heat treatment. The results indicated that the deformation mechanisms included slip induced crystal rotation, twinning, and shear deformation of the deformed grains. With the increased reduction, the number of deformation twins significantly increased and exhibited a remarkable grain orientation dependence. During annealing, twins played a crucial role in recrystallization nucleation, with Goss grain nucleation observed at twin sites, similar to shear bands. Combined with the slow heating annealing, the specimen achieved a maximum magnetostriction of 181 ppm.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":"81 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142193537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
First-principles calculations simulate and study material properties from a microscopic perspective. It is a computational method involving materials science, physics, chemistry, computer science, and artificial intelligence. As the current environmental service conditions are becoming increasingly complicated, Based on the traditional trial and error method, it is difficult to meet the cognition of the macro-mechanical performance and the actual internal micro -change of materials, so first principles calculation has become a feasible and efficient theoretical tool. This article reviews the application and research progress of the first principles calculation in the magnesium alloys. It focuses on the research mechanism of first-principles calculations in the aspects of magnesium alloy structure, generalized stacking fault energy(GSFE), twin, ideal tensile strength, passivation film and interface stability, etc., and discussed the alloy elements of magnesium alloy mechanics, corrosion performance and other influences. Finally, the problems and limitations of the first principle calculation in the material field are summarized, and the research direction and development prospects of the magnesium alloy futures are looked forward to.
{"title":"Application and research progress of first principles calculation in magnesium alloys","authors":"Xiaojie Jiang, Xiaoya Chen, Quanan Li, Dongzhen Wang, Zheng Wu","doi":"10.1016/j.mtcomm.2024.110317","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2024.110317","url":null,"abstract":"First-principles calculations simulate and study material properties from a microscopic perspective. It is a computational method involving materials science, physics, chemistry, computer science, and artificial intelligence. As the current environmental service conditions are becoming increasingly complicated, Based on the traditional trial and error method, it is difficult to meet the cognition of the macro-mechanical performance and the actual internal micro -change of materials, so first principles calculation has become a feasible and efficient theoretical tool. This article reviews the application and research progress of the first principles calculation in the magnesium alloys. It focuses on the research mechanism of first-principles calculations in the aspects of magnesium alloy structure, generalized stacking fault energy(GSFE), twin, ideal tensile strength, passivation film and interface stability, etc., and discussed the alloy elements of magnesium alloy mechanics, corrosion performance and other influences. Finally, the problems and limitations of the first principle calculation in the material field are summarized, and the research direction and development prospects of the magnesium alloy futures are looked forward to.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":"68 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142193591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-04DOI: 10.1016/j.mtcomm.2024.110310
Zihan Zheng, Yongqi Da, Tingshu He, Longgang Yu
Insulators are a composite structure composed of ceramic and aluminum flanges bonded together with cement adhesive, the strong bonding between cement adhesive and aluminum flanges is significant to ensure the normal operation of the ultra-high voltage transmission. However, the high alkalinity, low strength, high drying shrinkage, and weak interfacial adhesion between cement adhesive and aluminum flanges posed a big challenge to sound development of insulators, the related solution and research remained unknown. Therefore, the customized cement adhesive was prepared by Portland cement (OPC), sulphoaluminate cement (SAC) and mineral admixtures, and the effects of modified interface agents on the bonding characteristics between customized cement adhesive and aluminum flanges were investigated by FTIR, SEM and MIP. The findings revealed that an optimal customized cement adhesive could be obtained by adjusting a suitable ratio of OPC, SAC and mineral admixtures, 11d’s compressive strength of customized cement adhesive reached 89.3 MPa, the dry shrinkage rate at 28d decreased by 65.0 % than OPC, the pH reduce apparently at 11.52. The 11d interfacial bond strength using 45 % VAE and AA latex was 0.187 MPa and 0.276 MPa, which much higher than the blank sample as 0.055 MPa. The contact angles of 45 % VAE and AA latex decreases by 24.7 % and 35.0 % than asphalt. The modified interface agents could fill the large pores of cement adhesive, form a smooth and strong film in the binding structure. The polymer in the interface agent may chelate with Ca, Alor Fe further enhancing the cohesion.
{"title":"The effects of modified interface agents on the bonding characteristics between customized cement adhesive for insulators and aluminum flanges","authors":"Zihan Zheng, Yongqi Da, Tingshu He, Longgang Yu","doi":"10.1016/j.mtcomm.2024.110310","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2024.110310","url":null,"abstract":"Insulators are a composite structure composed of ceramic and aluminum flanges bonded together with cement adhesive, the strong bonding between cement adhesive and aluminum flanges is significant to ensure the normal operation of the ultra-high voltage transmission. However, the high alkalinity, low strength, high drying shrinkage, and weak interfacial adhesion between cement adhesive and aluminum flanges posed a big challenge to sound development of insulators, the related solution and research remained unknown. Therefore, the customized cement adhesive was prepared by Portland cement (OPC), sulphoaluminate cement (SAC) and mineral admixtures, and the effects of modified interface agents on the bonding characteristics between customized cement adhesive and aluminum flanges were investigated by FTIR, SEM and MIP. The findings revealed that an optimal customized cement adhesive could be obtained by adjusting a suitable ratio of OPC, SAC and mineral admixtures, 11d’s compressive strength of customized cement adhesive reached 89.3 MPa, the dry shrinkage rate at 28d decreased by 65.0 % than OPC, the pH reduce apparently at 11.52. The 11d interfacial bond strength using 45 % VAE and AA latex was 0.187 MPa and 0.276 MPa, which much higher than the blank sample as 0.055 MPa. The contact angles of 45 % VAE and AA latex decreases by 24.7 % and 35.0 % than asphalt. The modified interface agents could fill the large pores of cement adhesive, form a smooth and strong film in the binding structure. The polymer in the interface agent may chelate with Ca, Alor Fe further enhancing the cohesion.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":"66 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142193594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-04DOI: 10.1016/j.mtcomm.2024.110324
Yunlei Wang
Microscale particle-target interactions and the resulting modifications of the target material play a crucial role in the domains of industrial manufacturing and application process. As know that the processing and manufacturing, failure prevention, and even the spacecraft protection against hypervelocity micrometeorites and orbital microdebris. Based on such an interesting, noteworthy, and profoundly applied research, it quickly followed up and compiled a series of relevant studies for particle-target interactions of high-speed microparticle impact. Here, it discussed the gas-based, laser-based, and electrostatic-based of the high-speed microparticle impacts. Among these, laser-induced particle impacts stand out for their high throughput and the suitability for operation in small facilities or even on standard laboratory optical benches. Various behaviors have been observed with smaller projectiles, relatively high velocities, and extreme strain rates, which involved the description of launching system, dynamic capturing of high-speed videography, triggering and characterization of material response, and resulting material modification. Subsequently, it conducted a summary and future prospect of the focused topics. As expected that the particle-target interactions will become an effective tool for the study of microprocessing, multi-field coupling, material strengthening and modification, it will bridge multidisciplinary to understand the scientific phenomena involved in the impact process, also provides a novel strategy for the development of next-generation of ballistic impact testing.
{"title":"Particle-target interactions of high-speed microparticle impact for resulting material modifications","authors":"Yunlei Wang","doi":"10.1016/j.mtcomm.2024.110324","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2024.110324","url":null,"abstract":"Microscale particle-target interactions and the resulting modifications of the target material play a crucial role in the domains of industrial manufacturing and application process. As know that the processing and manufacturing, failure prevention, and even the spacecraft protection against hypervelocity micrometeorites and orbital microdebris. Based on such an interesting, noteworthy, and profoundly applied research, it quickly followed up and compiled a series of relevant studies for particle-target interactions of high-speed microparticle impact. Here, it discussed the gas-based, laser-based, and electrostatic-based of the high-speed microparticle impacts. Among these, laser-induced particle impacts stand out for their high throughput and the suitability for operation in small facilities or even on standard laboratory optical benches. Various behaviors have been observed with smaller projectiles, relatively high velocities, and extreme strain rates, which involved the description of launching system, dynamic capturing of high-speed videography, triggering and characterization of material response, and resulting material modification. Subsequently, it conducted a summary and future prospect of the focused topics. As expected that the particle-target interactions will become an effective tool for the study of microprocessing, multi-field coupling, material strengthening and modification, it will bridge multidisciplinary to understand the scientific phenomena involved in the impact process, also provides a novel strategy for the development of next-generation of ballistic impact testing.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":"7 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142224919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In order to strengthen high-entropy alloys with both good hot deformation processing property and fracture toughness, and avoid property damage caused by microstructure defects, optimized AlCrFeNiCu alloy is designed and prepared. The hot deformation curve of the alloy is studied, the constitutive equation of hot compression is deduced, the hot processing map is drawn, and the microstructure evolution and fracture toughness under the optimum hot deformation conditions are studied. The results show that the alloy has not high diffusion activation energy (=70.39 KJ/mol), high stress index (=13.11), high power dissipation factor and large hot processing zone. All show that the alloy has good deformation processing ability, and deformation processing can enhance the mechanical properties of the alloy. The hot processing zone is identified to be 940 C-1060 C, 0.01 s-0.04 s. After rolling and homogenization annealing, the alloy is composed of BCC+FCC dual-phase solid solution. After rolling deformation, discontinuous DRX is caused, forming a soft BCC phase (disordered A2 phase), and the disordered A2 phase squeezes each other to improve the bearing capacity. Dislocation strengthening effect is obvious. The preferred growth direction of the dendrite is either along <100> or along <110>. The fracture toughness value is high, reaching 54.20 MPa⋅m. The dendrite is tangent to the notch, which prevents the crack propagation from forming a barrier and helps to enhance the fracture toughness of the alloy.
{"title":"Rolling Al0.3CrFeNiCu1.5 alloy guided by hot simulation and fracture toughness of rolling alloy sheet","authors":"Rongyi Na, Shulin Dong, Yingdong Qu, Ruirun Chen, Guanglong Li, Wei Zhang, Siruo Zhang, Shibing Liu","doi":"10.1016/j.mtcomm.2024.110323","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2024.110323","url":null,"abstract":"In order to strengthen high-entropy alloys with both good hot deformation processing property and fracture toughness, and avoid property damage caused by microstructure defects, optimized AlCrFeNiCu alloy is designed and prepared. The hot deformation curve of the alloy is studied, the constitutive equation of hot compression is deduced, the hot processing map is drawn, and the microstructure evolution and fracture toughness under the optimum hot deformation conditions are studied. The results show that the alloy has not high diffusion activation energy (=70.39 KJ/mol), high stress index (=13.11), high power dissipation factor and large hot processing zone. All show that the alloy has good deformation processing ability, and deformation processing can enhance the mechanical properties of the alloy. The hot processing zone is identified to be 940 C-1060 C, 0.01 s-0.04 s. After rolling and homogenization annealing, the alloy is composed of BCC+FCC dual-phase solid solution. After rolling deformation, discontinuous DRX is caused, forming a soft BCC phase (disordered A2 phase), and the disordered A2 phase squeezes each other to improve the bearing capacity. Dislocation strengthening effect is obvious. The preferred growth direction of the dendrite is either along <100> or along <110>. The fracture toughness value is high, reaching 54.20 MPa⋅m. The dendrite is tangent to the notch, which prevents the crack propagation from forming a barrier and helps to enhance the fracture toughness of the alloy.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":"25 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142193546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-03DOI: 10.1016/j.mtcomm.2024.110315
Shun-Li Shang, Michael C. Gao, David E. Alman, Zi-Kui Liu
Aiming at revealing hydrogen (H) – materials interactions, the present theoretical work investigates the effect of H on the (111) surface energy (, and in actual fact the fracture free energy was studied herein) of Fe-rich fcc binary alloys FeX and FeX and ternary alloy FeCrNi, where X represents 31 alloying elements including Al, Co, Cr, Cu, Mn, Mo, Ni, V, W, and Zn. These values were predicted by density functional theory (DFT) based first-principles calculations using the nonmagnetic (NM, the present focus), ferromagnetic (FM), and antiferromagnetic (AFM) configurations. Correlation analysis reveals that the volume of X () is a predominant descriptor to model with with the goodness-of-fit R = 0.943 for the case of NM FeX. It is found that hydrogen adsorption decreases , i.e., increasing H-coverage on the surface of fcc Fe alloys decreases nearly linearly for most alloys. We further found that increases initially and then decreases with increasing volume for each alloy, implying that for Fe alloys with less H-coverage, decreases with increasing temperature.
{"title":"Effect of hydrogen on surface energy of fcc Fe alloys: A first-principles study","authors":"Shun-Li Shang, Michael C. Gao, David E. Alman, Zi-Kui Liu","doi":"10.1016/j.mtcomm.2024.110315","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2024.110315","url":null,"abstract":"Aiming at revealing hydrogen (H) – materials interactions, the present theoretical work investigates the effect of H on the (111) surface energy (, and in actual fact the fracture free energy was studied herein) of Fe-rich fcc binary alloys FeX and FeX and ternary alloy FeCrNi, where X represents 31 alloying elements including Al, Co, Cr, Cu, Mn, Mo, Ni, V, W, and Zn. These values were predicted by density functional theory (DFT) based first-principles calculations using the nonmagnetic (NM, the present focus), ferromagnetic (FM), and antiferromagnetic (AFM) configurations. Correlation analysis reveals that the volume of X () is a predominant descriptor to model with with the goodness-of-fit R = 0.943 for the case of NM FeX. It is found that hydrogen adsorption decreases , i.e., increasing H-coverage on the surface of fcc Fe alloys decreases nearly linearly for most alloys. We further found that increases initially and then decreases with increasing volume for each alloy, implying that for Fe alloys with less H-coverage, decreases with increasing temperature.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":"61 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142193547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
During plastic deformation processes, the ductile solids damage and fracture at the microscopic level originate from the evolution of micro -voids, including nucleation, growth and coalescence of voids. In this study, the fracture caused by damage of the AZ31 magnesium alloy sheet is analyzed using the Gurson-Tvergaard-Needleman (GTN) model. The damage parameters of the GTN model are determined by statistical void volume fractions (VVF) in three damage stages during uniaxial tensile experiments with scanning electron microscopy (SEM). The damage parameters are then optimized by the Back Propagation-Genetic Algorithms (BP-GA) neural network. According to the result, the main GTN damage parameters: the initial void volume, the critical volume fraction, the void volume fraction of the nucleation part, and the void volume fraction when the material finally fails are obtained, respectively. Comparing the simulation with the test, the results of the optimized parameters fit better. The void growth reflects the damage during the deformation process, and the GTN model can accurately predict the ductile damage. Furthermore, the experimental forming limit diagrams (FLDs) of the AZ31 sheet at 200℃ are accurately predicted using the parameters obtained by the GTN model. Good agreement has been observed between the experimental and predicted FLDs.
{"title":"GTN poroplastic damage model construction and forming limit prediction of magnesium alloy based on BP-GA neural network","authors":"Xuhui Sun, Xinyao Mo, Yi Liu, Wenjin Shen, Chenzhen Li, Yutao Li, Xiang Hu, Fengmei Xue","doi":"10.1016/j.mtcomm.2024.110295","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2024.110295","url":null,"abstract":"During plastic deformation processes, the ductile solids damage and fracture at the microscopic level originate from the evolution of micro -voids, including nucleation, growth and coalescence of voids. In this study, the fracture caused by damage of the AZ31 magnesium alloy sheet is analyzed using the Gurson-Tvergaard-Needleman (GTN) model. The damage parameters of the GTN model are determined by statistical void volume fractions (VVF) in three damage stages during uniaxial tensile experiments with scanning electron microscopy (SEM). The damage parameters are then optimized by the Back Propagation-Genetic Algorithms (BP-GA) neural network. According to the result, the main GTN damage parameters: the initial void volume, the critical volume fraction, the void volume fraction of the nucleation part, and the void volume fraction when the material finally fails are obtained, respectively. Comparing the simulation with the test, the results of the optimized parameters fit better. The void growth reflects the damage during the deformation process, and the GTN model can accurately predict the ductile damage. Furthermore, the experimental forming limit diagrams (FLDs) of the AZ31 sheet at 200℃ are accurately predicted using the parameters obtained by the GTN model. Good agreement has been observed between the experimental and predicted FLDs.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":"34 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142193552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-03DOI: 10.1016/j.mtcomm.2024.110327
Daxing Lei, Yaoping Zhang, Zhigang Lu, Bo Liu, Hang Lin
The shear strength of the rock discontinuities with different joint wall strengths (DDJS) is one of the important factors in the process of geotechnical engineering construction. This study presents a new data-driven model for predicting the shear strength of DDJS. This model uses conventional rock mechanics properties as inputs, extreme gradient boosting (XGBoost) model as surrogate model, and sparrow search algorithm optimized by levy flight strategy (LSSA) to optimize the hyperparameters of XGBoost model. Based on the collected database, the proposed model (LSSA- XGBoost model) establishes a nonlinear relationship between the shear strength of DDJS and the inputs. Then, the effects of data division ratio and different data preprocessing methods on the model are discussed. In order to verify the validity of LSSA- XGBoost model, it is compared with the original XGBoost model and SSA- XGBoost model. The results show that the LSSA- XGBoost model has high prediction accuracy with coefficient of determination (R) as high as 0.972 and root mean square error (RMSE) as low as 0.075. Moreover, the LSSA- XGBoost model avoids the disadvantage of SSA's optimization search falling into the local optimal value, and its running speed is significantly faster than that of the SSA- XGBoost model. For this database, the minimum-maximum normalization method and the 8:2 division ratio are the most suitable. The findings confirm the potential of this method and its superiority in predicting the shear strength of DDJS.
{"title":"Hybrid data-driven model for predicting the shear strength of discontinuous rock materials","authors":"Daxing Lei, Yaoping Zhang, Zhigang Lu, Bo Liu, Hang Lin","doi":"10.1016/j.mtcomm.2024.110327","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2024.110327","url":null,"abstract":"The shear strength of the rock discontinuities with different joint wall strengths (DDJS) is one of the important factors in the process of geotechnical engineering construction. This study presents a new data-driven model for predicting the shear strength of DDJS. This model uses conventional rock mechanics properties as inputs, extreme gradient boosting (XGBoost) model as surrogate model, and sparrow search algorithm optimized by levy flight strategy (LSSA) to optimize the hyperparameters of XGBoost model. Based on the collected database, the proposed model (LSSA- XGBoost model) establishes a nonlinear relationship between the shear strength of DDJS and the inputs. Then, the effects of data division ratio and different data preprocessing methods on the model are discussed. In order to verify the validity of LSSA- XGBoost model, it is compared with the original XGBoost model and SSA- XGBoost model. The results show that the LSSA- XGBoost model has high prediction accuracy with coefficient of determination (R) as high as 0.972 and root mean square error (RMSE) as low as 0.075. Moreover, the LSSA- XGBoost model avoids the disadvantage of SSA's optimization search falling into the local optimal value, and its running speed is significantly faster than that of the SSA- XGBoost model. For this database, the minimum-maximum normalization method and the 8:2 division ratio are the most suitable. The findings confirm the potential of this method and its superiority in predicting the shear strength of DDJS.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":"18 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142193544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-03DOI: 10.1016/j.mtcomm.2024.110313
Xueyan Qi, Lei Zhao, Lianyong Xu, Yongdian Han
The high temperature mechanical behavior of 316 H austenitic stainless steel with different grain size was investigated in this study through the use of a novel phenomenological dislocation model finite element method. The study was conducted by producing steel specimens with varying grain sizes through adjustments in annealing temperature and time, followed by high temperature tensile tests at 550°C. The finite element method, when integrated with a phenomenological dislocation model that considers grain size parameters, effectively captured the mechanical response under different grain size conditions. Additionally, the two-variable Kocks-Mecking(KM) model accurately captured the grain size effect in 316 H austenitic steel and effectively depicted its tensile flow behavior. The model’s predictions were based on the evolution of forest dislocation density and mobile dislocation density, proving to be a reliable tool for analyzing the microstructural evolution of 316 H austenitic steel specimens with varying grain sizes. This study provides insight into the effect of grain size on the high temperature strength of austenitic stainless steels and demonstrates the utility of a novel phenomenological model finite element method for predicting the mechanical behavior of polycrystalline materials.
本研究通过使用新型现象学位错模型有限元方法，对具有不同晶粒大小的 316 H 奥氏体不锈钢的高温力学行为进行了研究。研究通过调整退火温度和时间制作出不同晶粒大小的钢试样，然后在 550°C 下进行高温拉伸试验。有限元方法与考虑晶粒尺寸参数的现象学位错模型相结合，有效地捕捉了不同晶粒尺寸条件下的机械响应。此外，双变量 Kocks-Mecking（KM）模型准确捕捉了 316 H 奥氏体钢中的晶粒尺寸效应，并有效描述了其拉伸流动行为。该模型的预测基于森林位错密度和移动位错密度的演变，被证明是分析不同晶粒大小的 316 H 奥氏体钢试样微观结构演变的可靠工具。这项研究深入探讨了晶粒尺寸对奥氏体不锈钢高温强度的影响，并证明了新型现象学模型有限元方法在预测多晶材料力学行为方面的实用性。
{"title":"Exploring grain size influence on tensile behavior of 316 H austenitic stainless steel at high temperature: A phenomenological dislocation model","authors":"Xueyan Qi, Lei Zhao, Lianyong Xu, Yongdian Han","doi":"10.1016/j.mtcomm.2024.110313","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2024.110313","url":null,"abstract":"The high temperature mechanical behavior of 316 H austenitic stainless steel with different grain size was investigated in this study through the use of a novel phenomenological dislocation model finite element method. The study was conducted by producing steel specimens with varying grain sizes through adjustments in annealing temperature and time, followed by high temperature tensile tests at 550°C. The finite element method, when integrated with a phenomenological dislocation model that considers grain size parameters, effectively captured the mechanical response under different grain size conditions. Additionally, the two-variable Kocks-Mecking(KM) model accurately captured the grain size effect in 316 H austenitic steel and effectively depicted its tensile flow behavior. The model’s predictions were based on the evolution of forest dislocation density and mobile dislocation density, proving to be a reliable tool for analyzing the microstructural evolution of 316 H austenitic steel specimens with varying grain sizes. This study provides insight into the effect of grain size on the high temperature strength of austenitic stainless steels and demonstrates the utility of a novel phenomenological model finite element method for predicting the mechanical behavior of polycrystalline materials.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":"67 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142193548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2024-09-03DOI: 10.1016/j.mtcomm.2024.110305
Kun Yi, Mengcheng Zhou, Xiaoshan Huang, Di Zhang, Xinfang Zhang
In order to quantify the thermal and athermal effects during pulse current assisted deformation, the deformation behavior of medium manganese steel was studied using forced air cooling. At room temperature, the ultimate tensile strength of medium manganese steel is 1350 MPa and the total elongation is 47.3 %. However, in the pulsed current assisted deformation under forced air cooling, its strength and ductility are synergistically improved, with the ultimate tensile strength increased to 1380 MPa and the total elongation increased to 57 %. Athermal effects can delay deformation-induced martensite transformation by reducing austenite dislocation density and reducing stress concentration at austenite-ferrite phase boundaries, resulting in better strength and ductility in the pulsed tensile sample with forced air cooling. While the thermal effect increases the strain energy required for deformation-induced martensite transformation, resulting in a decrease in martensitic content and a decrease in accumulated dislocation density. Therefore, compared with the sample with forced air cooling, the ultimate tensile strength of the pulse tensile sample without forced air cooling is reduced.
{"title":"Current-manipulated martensite transformation to enhance strength-ductility synergy in a medium Mn steel","authors":"Kun Yi, Mengcheng Zhou, Xiaoshan Huang, Di Zhang, Xinfang Zhang","doi":"10.1016/j.mtcomm.2024.110305","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2024.110305","url":null,"abstract":"In order to quantify the thermal and athermal effects during pulse current assisted deformation, the deformation behavior of medium manganese steel was studied using forced air cooling. At room temperature, the ultimate tensile strength of medium manganese steel is 1350 MPa and the total elongation is 47.3 %. However, in the pulsed current assisted deformation under forced air cooling, its strength and ductility are synergistically improved, with the ultimate tensile strength increased to 1380 MPa and the total elongation increased to 57 %. Athermal effects can delay deformation-induced martensite transformation by reducing austenite dislocation density and reducing stress concentration at austenite-ferrite phase boundaries, resulting in better strength and ductility in the pulsed tensile sample with forced air cooling. While the thermal effect increases the strain energy required for deformation-induced martensite transformation, resulting in a decrease in martensitic content and a decrease in accumulated dislocation density. Therefore, compared with the sample with forced air cooling, the ultimate tensile strength of the pulse tensile sample without forced air cooling is reduced.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":"84 1","pages":""},"PeriodicalIF":3.8,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142193550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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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