Preparation of high strength Mg alloy sheet with 600MPa class by only cast →roll→heat treatment process

由<90.5><3.25><6.25>长周期有序相（LPO）和α-Mg组成的三元铸造Mg_ Ni_ Y_（at%）合金在623 K下轧制至70%的厚度压下量。经673 K × 6 h退火处理后，室温下的屈服应力、抗拉强度和延伸率分别为460 MPa、526 MPa和8%; 523 K下的屈服应力、抗拉强度和延伸率分别为301 MPa、345 MPa和12%。Y<94>含量较低的Mg_ Cu_3Y_3（at%）合金板材室温屈服强度、抗拉强度和延伸率分别为417 MPa、451 MPa和5%。这些合金板材的高强度源于LPO相基底织构的形成和细小Mg-M-Y相的分散。

Ternary Mg_<90.5>Ni_<3.25>Y_<6.25> (at%) cast alloy consisting of a long-period ordered (LPO) phase and α-Mg was rolled to 70% thickness reduction at 623K. After annealing at 673K for 6h, the alloy sheet showed a yield stress, an ultimate tensile strength, and an elongation of 460MPa, 526MPa, and 8%, respectively, at room temperature, and 301MPa, 345MPa, and 12 %, respectively, at 523K. Furthermore, Mg_<94>Cu_3Y_3 (at%) alloy sheet with lower Y content showed a yield stress, an ultimate tensile strength, and an elongation of 417MPa, 451MPa, and 5%, respectively, at room temperature. High strengthening of these alloys sheets originates from formation of basal texture of the LPO phase and dispersion of fine Mg-M-Y phase.