The microstructural evolution and mechanical properties of atomized Al-xFe-yCr alloys

Relation between the microstucture and mechanical property of Al-xFe-yCr alloy, with various types, volume fractions and sizes of dispersoids, has been studied. The alloys contain high concentrations of transition elements (Cr, Fe) which form thermally stable precipitates in the aluminium matrix High temperature tensile tests were performed to investigate the possibility of elevated temperature applications. Oxidation of powder surface during atomizing strengthens the bulk extrudates by providing the obstacle layer. The oxide layer is very chemically and thermally stable and prevent the coarsening of the intermediate compounds X-ray diffraction shows that the volume fraction of the a-Al matrix and the intermetallic compounds in the extrudates are changed depending on the composition of alloying elements. The extrudates exhibit a fine microstructures