Strengthening mechanisms for multicomponent Cu(Al)/Fe(Cr,Ni) alloys produced via dual-wire electron beam additive manufacturing

Abstract

Multicomponent alloys of the Cu(Al)/Fe(Cr,Ni) system with Fe(Cr,Ni) alloy content of 10, 25, and 50 vol % were produced. Experimental studies and calculations of strength characteristics based on microstructural studies were obtained. The results of experimental studies of the structure and mechanical properties showed the formation of secondary Fe₃Al, Cu₃Al, and NiAl particles, leading to an increase in the yield strength from 273 MPa to 593 MPa and the tensile strength from 626 MPa to 818 MPa, as well as a decrease in plasticity by 18 %. Calculated data on the contributions of strengthening mechanisms in multicomponent Cu(Al)/Fe(Cr,Ni) alloys with different Fe(Cr,Ni) alloy contents showed that, depending on the Fe(Cr,Ni) alloy content, the strengthening mechanisms that contribute the most change from grain boundary to solid solution.