Compressive deformation behaviour of Al alloy (2014)–10 wt.% SiCp composite: Effects of strain rates and temperatures
15 Dec 2011-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing (Elsevier)-Vol. 530, pp 225-232
TL;DR: In this article, compressive deformation behavior of AA2014-10-wt% SiCp composites synthesized by stir casting technique was studied over the strain rates of 001-10/s and the temperature range of 200-500 °C.
Abstract: This paper deals with the compressive deformation behaviour of AA2014–10 wt% SiCp composites synthesized by stir casting technique The response of the composites was studied over the strain rates of 001–10/s and the temperature range of 200–500 °C The flow stress increased with increasing strain rates while increasing temperature produced a reserve effect The flow behaviour of the samples has been represented by Zener–Holloman parameter Z that was affected by strain rate and temperature in a manner similar to that of the flow stress The lowering of Z value with increasing temperature is essentially due to extensive dynamic softening The stress exponent ( n ) and deformation activation energy ( Q ) have been evaluated by linear regression analysis The activation energy for the hot deformation of the composite was found to be 168 kJ/mol, which is higher than bulk self diffusion of pure Al ie, 142 kJ/mol The higher activation energy required for the flow of composite was mainly due to the alloying elements present in the Al matrix and dispersion of SiC particles that restricted the flow of material
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TL;DR: In this article, hot compression tests of hybrid aluminum-matrix composites reinforced with micro-SiC and nano-TiB2 were performed at deformation temperature of 350-500°C and strain rates of 0.001-1s−1 on Gleeble-3500 system.
45 citations
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.
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TL;DR: In this article, the compressive behavior of Al18B4O33w/2024Al composites fabricated by squeeze casting was investigated under low and elevated temperature, and the theory of synergistic effects caused by different strengthening mechanisms was used to predict the yield strength.
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TL;DR: In this paper, the authors studied the hot deformation behavior of 35%SiC p /2024 aluminum alloy composites with Gleeble-1500D thermo-mechanical simulator at temperatures ranging from 350 to 500 °C under strain rates of 0.01-10 s −1.
29 citations
14 Jun 2017-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the hot deformation behavior of powder metallurgy-processed 8009Al alloys reinforced with 15% SiC particles (8009Al/SiCp composites) was investigated by compression testing at temperatures of 400-550°C and strain rates of 0.001-1 s−1.
Abstract: The hot deformation behavior of powder metallurgy-processed 8009Al alloys reinforced with 15% SiC particles (8009Al/SiCp composites) was investigated by compression testing at temperatures of 400–550 °C and strain rates of 0.001–1 s–1. The corresponding deformed microstructures were characterized by scanning and transmission electron microscopy. The results showed that the flow stress increased with increasing strain and then stabilized at a constant value after reaching a peak value. The stress level decreased with increasing deformation temperature and decreasing strain rate, which could be represented by a Zener-Hollomon parameter in the hyperbolic-sine equation that integrates strain, temperature and strain rate. The deformation activation energy for the 8009Al/SiCp composites was calculated to be 481–495 kJ/mol. The flow behavior of the composites was attributed to intense dynamic recovery caused by the high volume fraction of very fine Al12(Fe,V)3Si-phase dispersoids in the Al matrix. The accommodation ability between the SiC particles and the Al matrix was discussed as well.
27 citations
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TL;DR: In this paper, an experiment was designed to check the equivalence of the effects of changes in strain rate and in temperature on the stress-strain relation in metal deformation.
Abstract: An experiment has been designed to check a previously proposed equivalence of the effects of changes in strain rate and in temperature upon the stress‐strain relation in metals. It is found that this equivalence is valid for the typical steels investigated. The behavior of these steels at very high rates of deformation may, therefore, be obtained by tests at moderate rates of deformation performed at low temperatures. The results of such tests are described. Aside from changing the isothermal stress‐strain relation, an increase of strain rate tends to change the conditions from isothermal to adiabatic. It is found that at low temperatures, the adiabatic stress‐strain relation in the plastic range is radically different from the isothermal, having an initial negative rather than a positive slope. This initial negative slope renders unstable homogeneous plastic deformation.
2,263 citations
TL;DR: In this article, the current status of particle reinforced metal matrix composites is reviewed and the different types of reinforcement being used, together with the alternative processing methods, are discussed, and different factors have to be taken into consideration to produce a high quality billet.
Abstract: Particle reinforced metal matrix composites are now being produced commerically, and in this paper the current status of these materials is reviewed. The different types of reinforcement being used, together with the alternative processing methods, are discussed. Depending on the initial processing method, different factors have to be taken into consideration to produce a high quality billet. With powder metallurgy processing, the composition of the matrix and the type of reinforcement are independent of one another. However, in molten metal processing they are intimately linked in terms of the different reactivities which occur between reinforcement and matrix in the molten state. The factors controlling the distribution of reinforcement are also dependent on the initial processing method. Secondary fabrication methods, such as extrusion and rolling, are essential in processing composites produced by powder metallurgy, since they are required to consolidate the composite fully. Other methods, suc...
1,961 citations
1,441 citations
TL;DR: In this article, the authors examined the conditions for cavity formation from equiaxed inclusions in ductile fracture and found that critical local elastic energy conditions are necessary but not sufficient for cavities formation.
Abstract: The previously proposed conditions for cavity formation from equiaxed inclusions in ductile fracture have been examined. Critical local elastic energy conditions are found to be necessary but not sufficient for cavity formation. The interfacial strength must also be reached on part of the boundary. For inclusions larger than about 100A the energy condition is always satisfied when the interfacial strength is reached and cavities form by a critical interfacial stress condition. For smaller cavities the stored elastic energy is insufficient to open up interfacial cavities spontaneously. Approximate continuum analyses for extreme idealizations of matrix behavior furnish relatively close limits for the interfacial stress concentration for strain hardening matrices flowing around rigid non-yielding equiaxed inclusions. Such analyses give that in pure shear loading the maximum interfacial stress is very nearly equal to the equivalent flow stress in tension for the given state of plastic strain. Previously proposed models based on a local dissipation of deformation incompatibilities by the punching of dislocation loops lead to rather similar results for interfacial stress concentration when local plastic relaxation is allowed inside the loops. At very small volume fractions of second phase the inclusions do not interact for very substantial amounts of plastic strain. In this regime the interfacial stress is independent of inclusion size. At larger volume fractions of second phase, inclusions begin to interact after moderate amounts of plastic strain, and the interfacial stress concentration becomes dependent on second phase volume fraction. Some of the many reported instances of inclusion size effect in cavity formation can thus be satisfactorily explained by variations of volume fraction of second phase from point to point.
757 citations
TL;DR: In this article, the deformation characteristics of ceramic whisker- and particulate-reinforced metal-matrix composites were studied experimentally and numerically with the objective of investigating the dependence of tensile properties on the matrix microstructure and on the size, shape, and distribution of the reinforcement phase.
721 citations