화학공학소재연구정보센터
Materials Science Forum, Vol.426-4, 2417-2422, 2003
Bulk nanostructured aluminium alloy Al93Fe3Cr2Ti2: Processing and characterisation
The ability to control the mechanical properties of bulk nanostructured aluminium alloys through judicious selection of processing parameters offers the potential for optimised performance together with the prospect of producing materials based on fitness-for-purpose criteria. In this investigation, nano-quasicrystalline powders of aluminium alloy Al93Fe3Cr2Ti2 (at. %) were consolidated using extrusion. This paper describes the influence of process variables on the tensile properties of the resultant bulk nanostructured alloy at room and at elevated temperatures. Lower extrusion temperatures provided an increase in strength without any significant reduction in ductility. The effect of extrusion ratio was negligible within the range investigated. The stress-strain characteristics were strongly influenced by test temperature, a significant increase in ductility being evident at higher temperatures. Fractographic and microstructural analyses enabled the scatter in ductility data to be rationalised on the basis of differences in the characteristics of the fracture surfaces.