Materials Science Forum, Vol.426-4, 4283-4288, 2003
The application of hot forming to influence the properties of P/M aluminium basis materials
Structural elements of aluminium P/M alloys are given their forms by either hot die forging or extrusion. The paper in part I includes an account of obtaining P/M aluminium semi-finished products by the process of extrusion. Formability and analysis of P/M materials Al20Si5Fe2Ni and A117Si5Fe3Cu1.1Mg0.6Zr spray formed and extruded are presented. The results of examination have shown that these materials are deformable over the range of temperatures from 400 to 500degreesC up to logarithmic strain 0.9. The material flow and temperature distribution during extrusion were analysed using FEM. The analyse enables the optimisation of the conditions of forming processes accounting for temperature distribution and the magnitude of local deformations. In part II of the paper the results of hot forming on the properties of FeAl intermetallic materials obtained by SHS are presented. The influence of temperature and deformation on density and the change of properties of FeAl intermetallic are shown. During forging FeAl porous SHS sinters at the temperature of 960degreesC and above, the greatest deformation can reach up to 80%. The mechanical properties of the material strongly depend on forming parameters.
Keywords:P/M aluminium alloys;Fe-Al intermetallics;closed-die forging;extrusion;finite element simulation