Abstract:Semi empirical formability criteria of the intermetallic compounds in binary alloy systems containing one or two transition elements have been proposed, based on a modified Miedema model and the results of computation by pattern recognition method. The regularities of compound formability between the non transition elements whose * <3.8 with transition elements can be adequately described by Δ * and Δn^1/3_ws ; when * >3.8 the effects of spd  hybridization on compound formability are enhanced. The regularities of the compound formability between two latter transition elements can be described by Δ* and Δn^1/3_ws only. While the systems containing one or two early transition elements exhibit higher chemical affinity due to spd hybridization. These criteria may also be useful for the formability study of ternary intermetallic compounds.

Key words: formability criterion intermetallic compound transition element