A high-strength Mg-Ni-Y alloy sheet with a long-period ordered phase prepared by hot-rolling

Ternary M90.5Ni3.25Y6.25 (at.%) cast alloy consisting of a long-period ordered (LPO) phase and alpha-Mg was rolled to 70% thickness reduction at 623K. After annealing at 673K for 6 h, kink bands of the LPO phase and alpha-Mg grains of about 700 nm were observed in the Mg90.5Ni3.25Y6.25 alloy sheet. The alloy sheet exhibited a yield stress, an ultimate tensile strength and an elongation of 460 MPa, 526 MPa and 8%, respectively, at room temperature, and 301 MPa, 345 MPa and 12%, respectively, at 523K. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.