Laser powder bed fusion of in-situ amorphous oxide dispersion strengthened immiscible Cu-316 L bimetallic composite: Formation mechanism and current-carrying wear behavior

Abstract

<p> This work used laser powder bed fusion (LPBF) to successfully produce in-situ nanoscale amorphous oxide dispersion strengthened (AODS) immiscible Cu-316 L bimetallic composite. Due to high affinity of Cr and O and the high cooling rate of LPBF, the formation of in-situ nano-amorphous Cr-rich oxide particles can refine the γ-Fe particles embedded in ε-Cu matrix. Moreover, the γ-Fe particles have “shadow protection effect” on ε-Cu matrix, the wear mechanism is mechanical wear during low current-carrying wear (0–2 A). However, during high current-carrying wear (5 A and 7 A), arc erosion preferentially occurs on γ-Fe particles with lower work functions, which enhances arc erosion resistance of ε-Cu matrix. The wear mechanisms are dominated by electric-arc erosion and oxidation wear. <br></p>