Journal ArticleDOI
Development of processing maps for 6061 Al/15% SiCp composite material
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In this paper, the hot working characteristics of 6061 Al/15%SiCp produced by stir casting are studied using processing maps, based on the dynamic materials model, were generated from the flow stress data obtained through hot compression tests conducted at strain rates and temperatures ranging from 0.0857 to 2.7 −1 and 300 to 500 −C, respectively.Abstract:
The hot working characteristics of 6061 Al/15%SiCp produced by stir casting are studied using processing maps. The maps, based on the dynamic materials model, were generated from the flow stress data obtained through hot compression tests conducted at strain rates and temperatures ranging from 0.0857 to 2.7 s−1 and 300 to 500 °C, respectively. From the experimental data the strain rate sensitivity (m), power dissipation efficiency (η) and instability parameter (ξ( e )) were computed and are plotted in the temperature-strain rate plane to obtain power dissipation and instability maps. The domains of dynamic recrystallization and wedge cracking are observed in the processing maps. Shear band formation and particle fracture were noticed at higher strain rates and lower temperature, thereby defining the flow instability domain.read more
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Friction Stir Welding and Processing : Science and Engineering
TL;DR: Friction stir welding as discussed by the authors is a well-studied process for friction-stir welding, where the process parameters, material flow and micro-structural evolution, tool features and role are modeled and simulated.
Journal ArticleDOI
Fabrication of nanostructure Al/SiCP composite by accumulative roll-bonding (ARB) process
TL;DR: In this paper, a new manufacturing process for Al-SiC P composites was developed by using bulk aluminum sheets and micron sized SiC particles as starting materials, and the results proved that by increasing ARB cycles the tensile strength of the produced composites increases, but their ductility at first decreases and then increases.
Journal ArticleDOI
Hot deformation behaviour of 7075 alloy
TL;DR: In this paper, the hot deformation behavior of Stir cast 7075 alloy was studied using processing map technique and the map has been interpreted in terms of the microstructural processes occurring in situ with deformation, based on the values of a dimensionless parameter η which is an efficiency index of energy dissipation through micro-structural process.
Journal ArticleDOI
Processing maps for hot working of ZK60 magnesium alloy
TL;DR: In this paper, the hot working behavior of ZK60 magnesium alloy by squeeze casting has been studied in the temperature range of 523 −723 K and strain rate range of 0.001 −10 −1 by establishing processing maps.
Journal ArticleDOI
Hot deformation characteristic and processing map of superaustenitic stainless steel S32654
TL;DR: In this paper, the hot deformation behavior of superaustenitic stainless steel S32654 was studied in the temperature range of 950-1200°C and strain rate range of 0.001-10−s −1 employing hot compression tests.
References
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Particulate reinforced metal matrix composites — a review
TL;DR: The physical and mechanical properties that can be obtained with metal matrix composites (MMCs) have made them attractive candidate materials for aerospace, automotive and numerous other applications as discussed by the authors.
Journal ArticleDOI
Modeling of dynamic material behavior in hot deformation: Forging of Ti-6242
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TL;DR: In this article, a new method of modeling material behavior which accounts for the dynamic metallurgical processes occurring during hot deformation is presented, which considers the workpiece as a dissipator of power in the total processing system and evaluates the dissipated power co-contentJ = ∫o σ e ⋅dσ from the constitutive equation relating the strain rate (e) to the flow stress (σ).
Journal ArticleDOI
Modelling of hot deformation for microstructural control
TL;DR: Bulk metal working processes are carried out at elevated temperatures where the occurrence of simultaneous softening processes would enable the imposition of large strains in a single step or multi-step process.
Journal ArticleDOI
Dynamic recrystallization in nickel and nickel-iron alloys during high temperature deformation
M.J Luton,C.M. Sellars +1 more
TL;DR: In this paper, it is established from metallographic and flow stress observations that dynamic recrystallization occurs at strains greater than a critical value and results in a recrystized grain size which is determined entirely by the flow stress.
Journal ArticleDOI
A nucleation criterion for dynamic recrystallization during hot working
W Roberts,B Ahlblom +1 more
TL;DR: In this paper, a criterion for the initiation of dynamic recrystallization during hot working is proposed based on the contention that the reduced driving force due to concurrent deformation modifies the normal energy balance which defines the conditions for nucleation of new grains.