Unlocking wear resistance in an ultrastrong dual-phase high-entropy alloy by interface-constrained deformation of brittle Laves phases

• DOI: 10.1007/s40544-024-0884-5
• Publication Date: 2024-07-05T09:02:07Z
• Authors: Fei Liang; Yixing Sun; Hongyuan Wan; Yong Li; Wenhao Lu; Ao Meng; Lei Gu; Zhaoping Luo; Yan Lin; Yaping Zhang; Xiang Chen
• Keywords: Laves phase; Brittleness; High-Entropy Alloys; Deformation mechanism

Abstract The pronounced brittleness of hard Laves phase intermetallics is detrimental to their tribological properties at room temperature. In this study, we utilized a heterogeneous structure engineer an ultrastrong dual-phase (Laves + B2) AlCoFeNiNb high-entropy alloy that exhibits low wear rate (3.82×10 −6 mm 3 /(N·m)) This resistance in the ball-on-disc sliding friction test with counterpart Al 2 O balls stems from activated deformation ability ultrafine lamellae under interface constraints. Furthermore, as stress intensifies, surface mechanism transitions dislocation slip on basal and pyramidal planes unique combination local shear grain rotation within phase. Our study illuminates fresh perspectives for mitigating embrittling effect loading development wear-resistant materials.