Journal ArticleDOI
Processing maps for hot-working of powder metallurgy 1100 Al-10 vol % SiC-particulate metal-matrix composite
TLDR
In this article, the hot-working characteristics of the metal-matrix composite (MMC) Al-10 vol % SiC-particulate (SiCp) powder metallurgy compacts in as-sintered and in hot-extruded conditions were studied using hot compression testing.Abstract:
The hot-working characteristics of the metal-matrix composite (MMC) Al-10 vol % SiC-particulate (SiCp) powder metallurgy compacts in as-sintered and in hot-extruded conditions were studied using hot compression testing. On the basis of the stress-strain data as a function of temperature and strain rate, processing maps depicting the variation in the efficiency of power dissipation, given by η = 2m/(m+1), where m is the strain rate sensitivity of flow stress, have been established and are interpreted on the basis of the dynamic materials model. The as-sintered MMC exhibited a domain of dynamic recrystallization (DRX) with a peak efficiency of about 30% at a temperature of about 500°C and a strain rate of 0.01 s−1. At temperatures below 350°C and in the strain rate range 0.001–0.01 s−1 the MMC exhibited dynamic recovery. The as-sintered MMC was extruded at 500°C using a ram speed of 3 mm s−1 and an extrusion ratio of 10∶1. A processing map was established on the extruded product, and this map showed that the DRX domain had shifted to lower temperature (450°C) and higher strain rate (1 s−1). The optimum temperature and strain rate combination for powder metallurgy billet conditioning are 500°C and 0.01 s−1, and the secondary metal-working on the extruded product may be done at a higher strain rate of 1 s−1 and a lower temperature of 425°C.read more
Citations
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Journal ArticleDOI
Study on hot deformation behavior and workability of squeeze-cast 20 vol%SiCw/6061Al composites using processing map
TL;DR: In this article, the hot deformation behavior and workability of squeeze-cast 20-vol%SiCw/6061Al composites were investigated by isothermal compression test and development of processing map, which was verified by uniaxial upsetting and two-directional forging of big cylindrical billets.
Journal ArticleDOI
Use of Artificial Neural Network for Prediction of Mechanical Properties of α-Al2O3 Particulate-reinforced Al–Si10Mg Alloy Composites Prepared by using Stir Casting Process
TL;DR: In this paper, the tensile strength, hardening behavior, and density properties of different α-Al2O3 particle size (μm)-reinforced metal matrix composites (MMCs), produced by using stir casting process, are predicted by designing a backpropagation (BP) neural network that used gradient-descent learning algorithm.
Journal ArticleDOI
Effect of volume fraction of SiC p reinforcement on the processing maps for 2124 Al matrix composites
TL;DR: In this paper, the hot working characteristics of 2124 Al alloy matrix composites reinforced with 0, 5, 10, 15, and 20 vol pct of SiC particulate, produced by the powder metallurgy route, were studied using processing maps.
Journal ArticleDOI
Hot deformation behavior and processing map development of cryorolled AA6063 alloy under compression and tension
TL;DR: In this article, the deformation of severely deformed AA6063 alloy was studied via hot tensile and hot compressive testing in temperature range of 300°C − 450°C and at strain rate of 0.001 s−1 − 10 s− 1.
Journal ArticleDOI
Processing map for hot working of 6061 Al–10 vol.-%Al2O3 metal matrix composite
TL;DR: In this paper, a processing map for hot working of 6061 Al-10 vol.-%Al2 O3(p) reinforced cast and extruded composite material has been generated covering the temperature range 350-550°C and the strain rate range 0·001-100 s−l, based on the dynamic materials model.
References
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Journal ArticleDOI
Modeling of dynamic material behavior in hot deformation: Forging of Ti-6242
Y. V. R. K. Prasad,Y. V. R. K. Prasad,H. L. Gegel,S. M. Doraivelu,J. C. Malas,J. T. Morgan,K. A. Lark,D. R. Barker +7 more
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
Development of a Processing Map for Use in Warm-Forming and Hot-Forming Processes
TL;DR: In this article, a fracture initiation map is developed which should be useful in fast forming operations at strain rates greater than about 10-3 s-1 at elevated temperatures, and two types of cavitation mechanisms, one pertaining to cavity formation at second phase particles, as in ductile fracture, and the other pertaining to wedge type microcracking at grain boundaries, are considered.
Journal ArticleDOI
Hot deformation and dynamic recrystallization of Al-5Mg-0.8Mn alloy
TL;DR: The AA 5083 alloy was deformed in torsion in the ranges 300-500°C and 1-1 S−1 to a strain of 5 as discussed by the authors The flow stress as a function of strain rose to a maximum value then gradually decreased towards a steady state and had a dependence on temperature and strain rate.
Journal ArticleDOI
Effect of stacking fault energy on the dynamic recrystallization during hot working of FCC metals: A study using processing maps
Y V R K Prasad,N Ravichandran +1 more
TL;DR: In this article, the influence of stacking fault energy (SFE) on the mechanism of dynamic recrystallization (DRX) during hot deformation of FCC metals is examined in the light of results from the power dissipation maps.
Book ChapterDOI
Mapping Dynamic Material Behaviour
TL;DR: A great deal of research work has been directed towards determining material properties, generally in the form of true stress-true strain curves at various temperatures and strain-rates, and then endeavouring to find suitable empirical relationships to assist in cataloguing those experimental results to facilitate their use.