where, fFCC, fB2-ppt, and fB2-stringer are the volume fractions of FCC matrix, B2 precipitate, and B2 stringer bands respectively . σFCC-SS /GB is the strength of FCC phase due to solid solution and GB strengthening and σFCC-ppt denotes the magnitude of precipitation strengthening in FCC phase ). σB2-ppt and σB2-stringer denote the strength of B2 precipitates and stringers respectively ). Dependence of σB2-ppt on the size of B2 precipitates is obtained from Refs. . In equation ( ), σFCC-SS/GB is calculated using the relation proposed by :