Reinforcing age Hardenable Al-Cr Matrix Alloy In-Situ and by SiC/Al2O3

Abstract

The achievable high ductility value of Al-Cr alloys (over 35% total elongation) has led to the attempt to produce in-situ composites with Al-Cr solid solution as the matrix phase and excess insoluble intermetallics CrAL as the reinforcing constituent.The alloy produced with 1.20 wt% Cr results in in-situ composites which gives a good combination of high tensile strength and ductility (approx. 30% elongation). Composites based on Al-Cr matrix alloy with SiC or A1,03 as the reinforcing phase showed that the increase in strength is quite considerable even at a relatively good ductility.