High-temperature compressive deformation behavior of Mg97Zn1Y2 extruded alloy containing a long-period stacking ordered (LPSO) phase

Non-Basal Slip Systems Operative in Mg₁₂ZnY Long-Period Stacking Ordered (LPSO) Phase with 18R and 14H Structures

“…1416) In addition, this alloy has a high potential for application as a high-temperature structural alloy because the strength remains very high at least up to 200°C. 15,21,22) The mechanical properties of a Mg 89 Zn 4 Y 7 (at%) extruded alloy containing the LPSO phase of more than 85 vol% were also examined, and we clarified that the alloy shows an extremely high yield stress of ³480 MPa at RT. 23) Therefore, there is a strong possibility that the high-volume-fraction LPSO phase alloys could be used in structural materials requiring an extremely high strength/weight ratio.…”

Hot deformation and processing map of an as-extruded Mg–Zn–Mn–Y alloy containing I and W phases

“…Therefore, magnesium alloys, being the lightest structural metallic material, have received a considerable attention in the application of light-weighed structural components in the automotive and aerospace sectors. However, the use of magnesium alloys is still very limited because of poor ductility and formability at room temperature and low strength at elevated temperatures [10][11][12][13][14][15][16]. There is a persistent effort to enhance the high temperature performance of magnesium alloys where one of scenarios being explored is the addition of rareearth metals [17,18].…”

An examination of strain ageing in a Mg–Y–Zn alloy containing Gd

“…There is presently considerable interest [1] in the development of Mg alloys containing rare earth additions, such as Y or Nd together with transition metals such as Zn that lead to the formation of LPSO phases [2][3][4][5], or such as Gd that forms a variety of Mg-Gd precipitate phases [6][7][8][9][10]. Both alloy families show very high strength with reasonable ductility, with composite-like alloys composed of a Mg matrix with large volume fraction of second phase receiving most attention [11,12].…”

“…Several studies have examined plastic deformation at high temperatures [5,8,[21][22][23][24][25], where such alloys may find application, and one reported characteristic is the onset of flow stress serrations when straining at intermediate temperatures [26][27][28][29]. This phenomenon is known as the Portevin-Le Chàtelier (PLC) effect [30][31][32][33][34] and is a consequence of a negative strain rate sensitivity, generally brought about by dynamic strain ageing (a temporary locking of dislocations by solute accretion).…”