High strength aluminum alloys reinforced by nanosize quasicrystalline particles for elevated temperature application

Abstract

Powders and rods from 6 ailoys of the group Al94Fe xCryTizZr6-x-y-z were produced and investigated. Powders were produced by a water atomization process and after degassing consolidated to rods by severe plastic deformation at 350°C - 400°C without sintering of the powders (by extrusion of powders in the preliminary evacuated and pressurized ampoules). Such a method of producing powders makes it possible to avoid liquation and other non-uniformities in chemical composition, to obtain the metastable quasicrystalline reinforcing particles in nanostructured aluminum matrix. The presence of the quasicrystalline icosahedral phase (the i-phase) in addition to α - Al matrix in the produced powders and rods of alloys Al94Fe xCryTizZr6-x-y-z is confirmed by X-ray diffraction analysis and TEM / SEM investigation. The high strength at 300°C (up to 330 MPa) and sufficient plasticity at room temperature (5-8%) were obtained in investigated rods.