Microstructure and room-temperature mechanical properties of Fe30Ni20Mn35Al15

A novel alloy with nominal composition Fe30Ni20Mn35Al15 was prepared by arc melting. Secondary electron microscopy and transmission electron microscopy examinations showed that it had a eutectoid structure, consisting of alternating FCC and B2 lamellae, whose widths were ∼ 500 nm and ∼ 200 nm, respectively. The room-temperature yield strength and Vickers hardness of the as-cast alloy were 740 ± 30 MPa and HV310 ± 15, respectively, and the alloy exhibited ∼ 8% elongation under tension.