Stacking fault and nano-twins dominating strengthening mechanism of (CuZnMnNi)100-xSnx high entropy brass alloy prepared by mechanical alloying and fast hot pressing sintering

In this work, a new strengthening mechanism is reported in (CuZnMnNi)100-xSnx high entropy brass alloy (HEBA) prepared by mechanical alloying and fast hot pressing sintering. Increasing Sn content can form more BCC phase, but decreases the mechanical property, and the stacking fault and nano-twins dominates the strengthening mechanism. High energy grain boundaries with substantial orientation variation or the lattice distortion caused by different phase transformation can lead to high local stress concentration, which provides driving force for the generation of stacking faults and nano-twins. Some nano-twins can also be formed via stacking growth.