Structural Properties Evaluation of Semisolid Extruded Al–Cu–Mg Powder Metallurgy Alloys

Bharath, Katti; Khanra, Asit Kumar; Davidson, M. J.

doi:10.1007/s12666-019-01581-8

Cited by 3 publications

(3 citation statements)

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“…The liquid fraction in the samples increases with increasing deformation temperature. 38 A very small volume of samples stuck to the die container walls during extrusion and reduced the surface smoothness of the sample due to high liquid fraction (Figure 2(c)). Samples extruded at 450°C and 500°C (Figure 2(a) and (b)) are showing a smooth surface compared to the sample extruded at 550°C due to lower liquid fraction.…”

Section: Resultsmentioning

confidence: 99%

“…The selection of composition was made on the basis of our previous report, wherein sintering behavior and structural properties evolution of P/M-processed Al-Cu-Mg alloys were presented. 38 Cylindrical green pellets with one aspect ratio (diameter of 15 mm and height of 15 mm) were prepared to obtain good dense compacts. All the green pellets were compacted by applying recommended pressures to get different IPRD samples of 70%, 80%, and 90%, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The liquid fraction in the samples increases with increasing deformation temperature. 38 A very small volume of samples stuck to the die container walls during extrusion and reduced the surface smoothness of the sample due to high liquid fraction (Figure 2 decreased with decreasing IPRD due to high porosity at lower IPRD. Porosity in 70% IPRD samples is higher than that of 80% and 90% IPRD samples.…”

Section: True Stress-true Strain Curvementioning

confidence: 99%

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Hot deformation behavior and dynamic recrystallization constitutive modeling of Al–Cu–Mg powder compacts processed by extrusion at elevated temperatures

Bharath

Khanra

Davidson

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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The deformation behavior of Al–Cu–Mg sintered preforms has been investigated by extrusion in the temperature range of 450–550°C and strain rate range of 0.1–0.3 s−1, respectively. The aim of this study is to analyze the effect of initial preform relative density on the hot deformation behavior and to model and predict the flow stress of extruded samples using constitutive equations. The true stress–strain curves exhibit three stages of deformation, which represent work hardening, dynamic recovery, and dynamic recrystallization during deformation at different temperatures, strain rates, and initial preform relative densities of 70%, 80%, and 90%, respectively. The results show that the flow stress values are influenced by initial preform relative density, deformation temperature, and strain rate. Microstructural examination of extruded specimens has been performed by optical microscopy and scanning electron microscopy. Arrhenius-type constitutive equations are developed to predict the flow stress of hot-extruded powder metallurgy processed aluminum alloy (Al–4%Cu–0.5%Mg). Zener–Hollomon parameter is used to explain the relationship between peak flow stress, temperature, and strain rate in an exponential equation containing the deformation activation energy and material constants. Subsequently, the statistical indicators correlation coefficient ( R) and the average absolute relative error are assessed to confirm the validity of constitutive equations. The results indicate the experimental and predicted peak flow stress values are in good agreement, which indicate the accuracy and reliability of the developed model for powder metallurgy processed Al–4%Cu–0.5%Mg preforms.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…The liquid fraction in the samples increases with increasing deformation temperature. 38 A very small volume of samples stuck to the die container walls during extrusion and reduced the surface smoothness of the sample due to high liquid fraction (Figure 2 decreased with decreasing IPRD due to high porosity at lower IPRD. Porosity in 70% IPRD samples is higher than that of 80% and 90% IPRD samples.…”

Section: True Stress-true Strain Curvementioning

confidence: 99%

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