Multi-material component and methods of making thereof

A multi-material component comprising:

• a first member comprising a steel;
• a second member comprising an aluminum alloy;
• and
• a third member welded to the first member and the second member, the third member comprising a high entropy alloy, the high entropy alloy is a solid solution comprising a face-centered cubic single phase solid solution or a body-centered cubic single phase solid solution, or is a combination of face-centered cubic and body-centered cubic phases, the high entropy alloy comprises at least four principal elements, wherein each of the at least four principal elements comprises at least 5 atomic % of the high entropy alloy, wherein the high entropy alloy comprises a mixing entropy of greater than 1.3 R, and wherein the entropy of mixing is determined using the equation ΔSmix=RlnN, wherein R is the gas constant and N is the total number of elements.