This study examines an Mg-8Li-5Al-0.5Ca-0.2Y alloy subjected to multi-step thermo-mechanical processing comprising hot extrusion,hot rolling,and room-temperature rolling.Extrusion at 300°C triggers dynamic recrys...This study examines an Mg-8Li-5Al-0.5Ca-0.2Y alloy subjected to multi-step thermo-mechanical processing comprising hot extrusion,hot rolling,and room-temperature rolling.Extrusion at 300°C triggers dynamic recrystallization of theα-Mg phase and leads to the formation of MgLi2Al and AlLi precipitates within theβ-Li matrix,while Al2Ca and Al2Y phases segregate along the extrusion direction.Subsequent rolling at 260°C and room temperature further refinesα-Mg grains,raises dislocation density,and homogenizes the dispersed Al2Ca and Al2Y particles.Texture analysis indicates that theα-Mg component reorients from the transverse direction toward the normal direction,driven by the competition between basal and prismatic slip,and exhibits enhanced texture strength.In contrast,theβ-Li phase preserves stableα-andγ-fiber textures.The multi-step deformation process endows the alloy with a balanced combination of tensile strength(303 MPa),yield strength(273 MPa),and elongation(8.6%).These improvements are attributed to collective contributions from grain refinement,stress-induced phase transformation,and dislocation accumulation during plastic deformation.The established microstructure–property correlations provide a viable pathway for designing high-strength Mg alloys with tailored texture and phase distribution.展开更多
In the aerospace industry,integrated aluminium alloy plates and stiffened panels with high accuracy and performance attract significant interest.To manufacture these panels as integrity with high accuracy,multiple pro...In the aerospace industry,integrated aluminium alloy plates and stiffened panels with high accuracy and performance attract significant interest.To manufacture these panels as integrity with high accuracy,multiple processes need to be utilised,such as machining,welding and forming.During the whole manufacturing chain,residual stresses can be generated and redistributed in the components among different processes.The residual stress would significantly affect the shapes and properties of the final products.Currently,these great effects are not well considered in the design and manufacturing processes.This paper aims to draw a general understanding of the residual stress generated in the pre-manufacturing processes and its effects on subsequent manufacturing processes.The mechanisms and distributions of residual stresses generated in typical premanufacturing processes of structural panels,including machining,welding and additive manufacturing(AM),are firstly summarised.The detailed effects of generated residual stresses on distortion and application properties in subsequent manufacturing processes are then concluded.In addition,current methods developed for the investigation of residual stress effect in multi-processes manufacturing are critically reviewed,including experimental,analytical,finite element(FE)and machine learning methods.Furthermore,the future development trend of methods for residual stress consideration and control in the design of manufacturing processes is summarised,providing comprehensive guidance to achieve the high accurate manufacturing of aluminium alloy structural components.展开更多
The quantitative evaluation of multi-process collaborative operation is of great significance for the improvement of production planning and scheduling in steelmaking–continuous casting sections(SCCSs). However, this...The quantitative evaluation of multi-process collaborative operation is of great significance for the improvement of production planning and scheduling in steelmaking–continuous casting sections(SCCSs). However, this evaluation is difficult since it relies on an in-depth understanding of the operating mechanism of SCCSs, and few existing methods can be used to conduct the evaluation, due to the lack of full-scale consideration of the multiple factors related to the production operation. In this study, three quantitative models were developed, and the multiprocess collaborative operation level was evaluated through the laminar-flow operation degree, the process matching degree, and the scheduling strategy availability degree. Based on the evaluation models for the laminar-flow operation and process matching levels, this study investigated the production status of two steelmaking plants, plants A and B, based on actual production data. The average laminar-flow operation(process matching) degrees of SCCSs were obtained as 0.638(0.610) and 1.000(0.759) for plants A and B, respectively, for the period of April to July 2019. Then, a scheduling strategy based on the optimization of the furnace-caster coordinating mode was suggested for plant A. Simulation experiments showed higher availability than the greedy-based and manual strategies. After the proposed scheduling strategy was applied,the average process matching degree of the SCCS of plant A increased by 4.6% for the period of September to November 2019. The multi-process collaborative operation level was improved with fewer adjustments and interruptions in casting.展开更多
Based on analyzing the storage structure of polarimetric interferometry synthetic aperture radar(Pol-InSAR)data,this study proposed a multi-core parallel Pol-InSAR data processing method(MCP-PIDPM).In order to improve...Based on analyzing the storage structure of polarimetric interferometry synthetic aperture radar(Pol-InSAR)data,this study proposed a multi-core parallel Pol-InSAR data processing method(MCP-PIDPM).In order to improve the processing speed of Pol-InSAR data,this paper presented a multi-core parallel Pol-InSAR data processing scheme,and constructed its processing framework in the research.The key technology of the multi-core parallel Pol-InSAR data processing was discussed,a buffer detection splitting method for Pol-InSAR image was proposed,and improved the self-adaptive phase unwrapping method.At last,a multi-core parallel Pol-InSAR data processing system(MCP-PIDPS)was developed,and the proposed MCP-PIDPM method was tested and validated through experiments.The system based on the above method assigns tasks and loads reasonably to each processor and uses space to exchange time.It is proved by numerical experiments that the efficiency of Pol-InSAR data processing is increased by more than 10 times.The research breaks through the bottleneck which restricts the efficient application of Pol-InSAR,and provides a feasible solution for the efficient processing of Pol-InSAR data.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.52371005 and 52534009)the Liaoning Revitalization Talents Program(No.XLYC2403182)+2 种基金the Liaoning Province Science and Technology Plan Joint Program(No.2024JH2/102600032)the Fundamental Research Funds for the Central UniversitiesE.G.thanks Xiaomi Foundation for support.
摘要This study examines an Mg-8Li-5Al-0.5Ca-0.2Y alloy subjected to multi-step thermo-mechanical processing comprising hot extrusion,hot rolling,and room-temperature rolling.Extrusion at 300°C triggers dynamic recrystallization of theα-Mg phase and leads to the formation of MgLi2Al and AlLi precipitates within theβ-Li matrix,while Al2Ca and Al2Y phases segregate along the extrusion direction.Subsequent rolling at 260°C and room temperature further refinesα-Mg grains,raises dislocation density,and homogenizes the dispersed Al2Ca and Al2Y particles.Texture analysis indicates that theα-Mg component reorients from the transverse direction toward the normal direction,driven by the competition between basal and prismatic slip,and exhibits enhanced texture strength.In contrast,theβ-Li phase preserves stableα-andγ-fiber textures.The multi-step deformation process endows the alloy with a balanced combination of tensile strength(303 MPa),yield strength(273 MPa),and elongation(8.6%).These improvements are attributed to collective contributions from grain refinement,stress-induced phase transformation,and dislocation accumulation during plastic deformation.The established microstructure–property correlations provide a viable pathway for designing high-strength Mg alloys with tailored texture and phase distribution.
基金co-supported by the National Natural Science Foundation of China(No.52005020)Guangdong Basic and Applied Basic Research Foundation(No.2019A1515110851).
摘要In the aerospace industry,integrated aluminium alloy plates and stiffened panels with high accuracy and performance attract significant interest.To manufacture these panels as integrity with high accuracy,multiple processes need to be utilised,such as machining,welding and forming.During the whole manufacturing chain,residual stresses can be generated and redistributed in the components among different processes.The residual stress would significantly affect the shapes and properties of the final products.Currently,these great effects are not well considered in the design and manufacturing processes.This paper aims to draw a general understanding of the residual stress generated in the pre-manufacturing processes and its effects on subsequent manufacturing processes.The mechanisms and distributions of residual stresses generated in typical premanufacturing processes of structural panels,including machining,welding and additive manufacturing(AM),are firstly summarised.The detailed effects of generated residual stresses on distortion and application properties in subsequent manufacturing processes are then concluded.In addition,current methods developed for the investigation of residual stress effect in multi-processes manufacturing are critically reviewed,including experimental,analytical,finite element(FE)and machine learning methods.Furthermore,the future development trend of methods for residual stress consideration and control in the design of manufacturing processes is summarised,providing comprehensive guidance to achieve the high accurate manufacturing of aluminium alloy structural components.
基金financially supported by the National Natural Science Foundation of China (Nos.50874014 and 51974023)the Fundamental Research Funds for Central Universities (No.FRF-BR-17-029A)。
摘要The quantitative evaluation of multi-process collaborative operation is of great significance for the improvement of production planning and scheduling in steelmaking–continuous casting sections(SCCSs). However, this evaluation is difficult since it relies on an in-depth understanding of the operating mechanism of SCCSs, and few existing methods can be used to conduct the evaluation, due to the lack of full-scale consideration of the multiple factors related to the production operation. In this study, three quantitative models were developed, and the multiprocess collaborative operation level was evaluated through the laminar-flow operation degree, the process matching degree, and the scheduling strategy availability degree. Based on the evaluation models for the laminar-flow operation and process matching levels, this study investigated the production status of two steelmaking plants, plants A and B, based on actual production data. The average laminar-flow operation(process matching) degrees of SCCSs were obtained as 0.638(0.610) and 1.000(0.759) for plants A and B, respectively, for the period of April to July 2019. Then, a scheduling strategy based on the optimization of the furnace-caster coordinating mode was suggested for plant A. Simulation experiments showed higher availability than the greedy-based and manual strategies. After the proposed scheduling strategy was applied,the average process matching degree of the SCCS of plant A increased by 4.6% for the period of September to November 2019. The multi-process collaborative operation level was improved with fewer adjustments and interruptions in casting.
基金supported by the National Natural Science Foundation of China(No.42471508)Natural Science Foundation of Shandong Province(ZR2025MS537).
摘要Based on analyzing the storage structure of polarimetric interferometry synthetic aperture radar(Pol-InSAR)data,this study proposed a multi-core parallel Pol-InSAR data processing method(MCP-PIDPM).In order to improve the processing speed of Pol-InSAR data,this paper presented a multi-core parallel Pol-InSAR data processing scheme,and constructed its processing framework in the research.The key technology of the multi-core parallel Pol-InSAR data processing was discussed,a buffer detection splitting method for Pol-InSAR image was proposed,and improved the self-adaptive phase unwrapping method.At last,a multi-core parallel Pol-InSAR data processing system(MCP-PIDPS)was developed,and the proposed MCP-PIDPM method was tested and validated through experiments.The system based on the above method assigns tasks and loads reasonably to each processor and uses space to exchange time.It is proved by numerical experiments that the efficiency of Pol-InSAR data processing is increased by more than 10 times.The research breaks through the bottleneck which restricts the efficient application of Pol-InSAR,and provides a feasible solution for the efficient processing of Pol-InSAR data.