Journal of Materials Science, Vol.32, No.7, 1841-1847, 1997
Development of Net-Shape Cast Aluminum-Yttrium Alloy Wires and Their Solidification Structures
Cast-aluminium-1.5-7 wt % yttrium alloy wires were produced by the heated mould (Ohno Continuous Casting) process with a typical casting speed of 1.1 m min(-1). Using a 2 mm diameter channel bore and positioning the solidification front outside the mould, it was possible to cast wires of 1.6-1.9 mm diameter with uniform chemical composition along the length of the wire. Cast wires contained directionally solidified cells or dendrites of cc-aluminium with metastable Al4Y and beta-Al3Y phases in intercellular or interdendritic regions. At higher casting speeds ( > 1.1 m min(-1)), the predominant metastable phase was found to be Al4Y.
Keywords:AL-LA