HIGH MECHANICAL STRENGTHS OF RAPIDLY SOLIDIFIED AL93MN5CE1M1 (M = TRANSITION-METAL) ALLOYS CONTAINING NANOSCALE QUASI-CRYSTALLINE PHASE AS A MAIN COMPONENT

The microstructure and mechanical properties of rapidly solidified Al9 3Mn5Ce1M1 (M = Cr, Mn, Fe, Co, Ni, Pd or Cu) alloys were examined with the aim of obtaining a high specific strength alloy by structural con trol in a mixed structure consisting of nanoscale icosahedral particle s surrounded by Al phase. The as-quenched structure consists of spheri cal icosahedral particles and equiaxed Al grains with icosahedral prec ipitates along the grain boundary for the Al93Mn5Ce1M1 (M = Ni, Co or Fe) alloys and the highest value of sigma(f) is 1160 MPa for the Ni-co ntaining alloy. The reasons for the formation of the novel mixed struc ture and the achievement of high sigma(f) and good ductility have also been investigated on the basis of the present results and the previou s data reported by the present authors.