Abstract
The high temperature deformation behavior of commercial Al-12Si-3Cu-2Ni-1Mg alloy (DM104™) which was fabricated by casting and subsequent hot extrusion was evaluated by compressive tests over the temperature range of 250–470 °C and strain rate range of 0.001–1/s. The extruded alloy had equiaxed grains, spherical Si particles and fine intermetallic phases, such as δ(Al3NiCu) and Q(Al5Cu2Mg3Si6). The true stress-true strain curves from the compressive tests exhibited steady-state flow after reaching the peak stress. A close relationship between the steady-state stress and a constitutive equation for high temperature deformation was observed. Fine equiaxed grains and a dislocation structure within the equiaxed grains were observed in the deformed specimens, suggesting the occurrence of dynamic recrystallization during high temperature deformation.
Highlights
Al-Si-based alloys are used widely as a piston materials because of their good specific strength, excellent wear resistance and low coefficient of thermal expansion [1,2,3,4]
These results suggest that the alloy had experienced dynamic recrystallization during the extrusion process [10]
Compressive tests of the commercial Al‐12Si‐3Cu‐2Ni‐1Mg alloy (DM104TM) fabricated by casting and subsequent extrusion were conducted over the temperature range, 250–470 °C, and strain rate range of 0.001–1/s
Summary
Al-Si-based alloys are used widely as a piston materials because of their good specific strength, excellent wear resistance and low coefficient of thermal expansion [1,2,3,4]. It was reported that Ni is a desirable element for improving the mechanical properties of Al-Si-based alloys at elevated temperatures by forming thermally stable. The DM104 alloy can be applicable as a forging stock for forged pistons and as a cast piston material. In the case of its use as a forging stock, a careful study of the plastic deformation behavior of the material up to the high temperature region is needed to determine the optimal processing conditions for forging. The plastic deformation behavior of the extruded Al-12Si-3Cu-2Ni-1Mg alloy was examined using compressive tests over a wide range of temperatures and strain rates. Detailed microstructural observations were made for the specimens before and after deformation
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