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These symposium proceedings from the 1998 TMS Fall Meeting examine the relationships between mechanical behavior and microstructural evolution that must be quantified to develop predictive models for hot deformation. Issues addressed include constitutive modeling; process design and modeling; laboratory simulation of large scale hot working processes; the evolution of microstructure; texture, damage, dynamic precipitation, recovery, and recrystallization processes; creep and superplastic deformation; and the ability to predict phenomena such as corrosion and formability after hot deformation.
A comprehensive treatise on the hot working of aluminum and its alloys, Hot Deformation and Processing of Aluminum Alloys details the possible microstructural developments that can occur with hot deformation of various alloys, as well as the kind of mechanical properties that can be anticipated. The authors take great care to explain and differenti
"This is the proceedings of the third symposium on Hot Deformation in Aluminum Alloys, held in San Diego, CA, March 3-6, 2003."--p. xi.
The aim of conference is to experience exchange between scientists, designers and technologists who work at field of Materials Science and Materials Processing Technologies for Mechanical Engineering.
As automotive companies adjust to stricter environmental legislations, there is increased interest in the application of high specific strength alloys such as the AA6xxx aluminum alloys. In the near term, light weighting of vehicles through the use of high strength aluminum alloys is one solution to improve fuel efficiency. This research was performed to help understand the extrudability of some Al-Mg-Si alloys as well as the effect of extrusion conditions on final mechanical properties. The alloys studied were designed by General Motors (GM) and include variations in the Mg, Si and Cr contents. The research is primarily experimental in nature and consisted of measuring and modelling the hot flow stress behaviour of these alloys, performing both laboratory scale and industrial extrusion trials as well as mechanical and microstructural characterization of the extruded materials. The well-known Sellars-Tegart model was applied in development of constitutive equations for predicting the hot flow stress behavior of Al-Mg-Si alloys. The influence of hold time on Mg-Si solute content level during pre-deformation heating of an as-cast and homogenized Al-Mg-Si alloy was determined and the Mg-Si solute content (X) integrated into a constitutive equation for predicting the alloy's flow stress behavior during hot compression testing. The constitutive model predictions were observed to agree well with experimental data for the aluminum alloys tested in this research. The effect of extrusion processing condition, alloy composition and aging time on the extrudability, mechanical properties and fracture morphology as well as microstructure of Al-Mg-Si alloys was studied. The extrudability of the Al-Mg-Si alloys was observed to reduce with an increase in the Mg-Si content, presence of 0.2 wt % Cr and reduction in extrusion temperature. For laboratory extrusion trials, peripheral coarse grains were not observed in alloys containing Cr and Mn. The strength property in the T4, T5 and T6 conditions was observed to increase with Mg-Si content while 0.2 wt % Cr addition favors improved ductility. The alloys containing Cr were observed to exhibit ductile dimple fracture and a transgranular morphology while an intergranular fracture was observed in the Al-Mg-Si alloys with no Cr content. The strain rate sensitivity and anisotropic behaviors of an Al-Mg-Si alloy were determined by performing quasi-static tensile test at 0.001, 0.01 and 0.1 s-1 on heat treated (T4 and T6) profiles extruded in industrial scale extrusion equipment. The T4 alloy samples were observed to exhibit reduced anisotropic behavior in comparison with T6 samples. In this thesis, a more effective constitutive model for predicting the hot flow stress behavior of Al-Mg-Si alloys has been developed. The developed constitutive relation can be an effective tool for modeling forming processes such as extrusion and rolling, Also, a systematic through process (from extrusion processing to aging) investigation of the effect of alloy composition, extrusion and aging conditions on the final mechanical properties of Al-Mg-Si alloys has been performed.
This book highlights recent findings in industrial, manufacturing and mechanical engineering and provides an overview of the state of the art in these fields, mainly in Russia and Eastern Europe. A broad range of topics and issues in modern engineering is discussed, including the machinery and mechanism design, dynamics of machines and working processes, friction, wear and lubrication in machines, design and manufacturing engineering of industrial facilities, transport and technological machines, mechanical treatment of materials, industrial hydraulic systems. This book gathers selected papers presented at the 9th International Conference on Industrial Engineering (ICIE), held in Sochi, Russia, in May 2023. The authors are experts in various fields of engineering, and all papers have been carefully reviewed. Given its scope, this book will be of interest to a wide readership, including mechanical and production engineers, lecturers in engineering disciplines, and engineering graduates.
Xiii, 139, 2 leaves : ill. ; 30 cm.
La raison en était que la recristallisation ne se produisait que dans les zones dépourvues de particules (PFZ) et que la fraction de ces zones (PFZ) accrue avec la teneur en Mn, ce qui entraînait une augmentation de la fraction de recristallisation. La variation de la densité en nombre de dispersoïdes et leurs grossissements lors du recuit ont une influence limitée sur la recristallisation statique dans les alliages contenant du Mn.