Nanostructure and Mechanical Properties of Bulk Al86Ni6Y6Ce2 Alloy Produced by Hot Consolidation of Amorphous Melt-Spun Flakes

摘要

Amorphous Al86Ni6Y6Ce2 (at. pct) flakes produced by melt spinning were consolidated using hot pressing at different conditions. The influence of pressing conditions on the crystallization behavior, thermal stability, and mechanical properties of the alloy has been studied through differential scanning calorimetry, scanning electron microscopy, X-ray diffraction, microhardness, and compression test. The results show rapid solidification combined with the hot consolidation produce a highly dense sample (3.41 +/- A 0.2 g cm(-3)) with the ideal interflake bonding, good thermal stability, good microhardness (381 +/- A 12 HV), and remarkably high strength (910 +/- A 7 MPa) combined with 20 pct fracture strain were obtained at T = 748 K (475 A degrees C) and P = 1.2 GPa in a lightweight Al-based material. The high mechanical properties mainly result from structural refinement during the controlled consolidation method.