High throughput multi-property evaluation of additively manufactured Co-Fe-Ni materials libraries

In this work, novel alloy compositions possessing promising combinations of properties were identified by accelerated methodologies. Assessment of the structure as well as the magnetic, mechanical, and electrical properties of compositionally graded Co-Fe-Ni alloy samples processed by laser additive manufacturing (AM) was carried out. In-situ alloying occurring during the AM process, which facilitated the rapid synthesis of a compositionally graded material library and the subsequent assessment of several properties. A large change in these properties was observed as a function of composition. Saturation magnetization (M_s) varied from 60 to 230 emu/g, coercivity (H_c) from 0.4 to 66.4 Oe, resistivity (ρ) from 9.4 to 72.6 μΩ-cm, microhardness from 90 to 400 Hv, ultimate tensile strength from 465 to 1167 MPa, etc. Fe₁₅Ni₈₅, Fe₆₀Ni₄₀, Co₂₀Fe₇₀Ni₁₀ exhibit the best H_c, ρ and Hv, respectively. Significantly, novel Co-Fe-Ni compositions possessing high hardness as well as large M_s, low H_c and moderate ρ were rapidly identified using this methodology.