Effect of Temperature on the Microstructure and Superplasticity in a Powder Metallurgy Processed Al-16Si-5Fe-1Cu-0.5Mg-0.9Zr (wt%) Alloy

초록

A hyper-eutectic Al-Si alloy has a low density, low thermal expansion coefficient and good wear resistance, which are suitable for light-weight engine part application. Recently developed powder metallurgy(PM) processed hyper-eutectic Al-Si alloy containing Fe, Cu, Mg and Zr had submicron sized grain structure and enhanced tensile strength. In addition, the PM Al-Si based alloy exhibited superplastic deformation with a large elongation of about 400% at 793K and a high strain rate of 1.4´10-1s-1[2]. In the present paper, temperature dependence of the microstructure and tensile deformation behavior including superplasticity is demonstrated over a wide range of temperature from 673 to 813K at the strain rate of 1.4´10-1s-1.