EFFECTS OF PROCESS VARIABLES ON MECHANICAL-PROPERTIES OF EXTRUDED AL-CR-ZR BASE RAPIDLY SOLIDIFIED ALLOY PARTICULATE

Results for tensile properties and hardness of a series of extrusions of Al-Cr-Zr base alloy particulates show that, while extrusion or ther mal exposure at relatively high temperature significantly reduces stre ngth and hardness, extrusion ratio in the range 16 to 30:1 at 300-degr ees-C or post-extrusion heat treatment at this temperature has relativ ely little effect. Results for the range of alloy compositions and pro cess conditions investigated correlate well with the relationships sig ma = K1H(v) and log epsilon(f) = K2/H(v), where K1 = 2.9 +/- 0.2 and 3 .5 +/- 0.2 for 0.2% proof strength respectively and K2 = 140 +/- 30 (s igma in MPa, H(v) in kg/mm2 and elongation to fracture epsilon(f) in p ercent).