Mechanical properties, microstructure and crystal structures of Al 98−3 xCu 2 xFe xCe 1Zr 1 ( x = 1–3 at.%) alloys extruded from their atomized powders

Abstract

The mechanical properties, microstructures and crystal structures of Al 98−3 x Cu 2 x Fe x Ce 1Zr 1 ( x = 1–3 at.%) alloys extruded from their atomized powders were investigated. The extruded alloys have high tensile strength, large elongation and good heat-resistant properties. The tensile strength and elongation of the alloys range from 880 to 580 MPa and from 1.5% to 19.2% respectively. The Al 98−3 x Cu 2 x Fe x Ce 1Zr 1 ( x = 2–3 at.%) alloys have a high temperature tensile strength of 264–295 MPa at 573 K. The thermal stability of the as-extruded Al 98−3 x Cu 2 x Fe x Ce 1Zr 1 ( x = 1–3 at.%) alloys was evaluated by differential scanning calorimetry. The microstructures and crystal structures of these alloys were analysed by X-ray diffractometry and transmission electron microscopy. The as-extruded Al 98−3 x Cu 2 x Fe x Ce 1Zr 1 ( x = 1–3 at.%) alloys are composed of α-Al and a cubic phase with lattice parameter a = 0.8420 nm. The excellent mechanical properties originate from the existence of the cubic phase.