NewbulkmetallicglassesareproducedbysubstitutingafewatomicpercentagesofironwithyttriumintheFe45#8722;xCr16Mo16C18B5Yx(x=0,1,2,3)alloysystems.Thestudyshowsthattheoptimumyttriumcontentinthealloyforthebestglass-formingabilityis2at.%,andwiththiscompositionfullyamorphousas-castsampleswithasize