Effect of Y on microstructure and mechanical properties of duplex Mg–7Li alloys

Microstructures and Mechanical Properties of As-Cast and Hot-Rolled Mg-8.43Li-0.353Ymm (Y-riched mischmetch) Alloy

“…RE elements are surface elements in Mg alloy, and they can refine the a-Mg phase of duplex Mg-Li alloys. [28] Previous works reveal that RE elements of Y and Ho concentrate at the surface of the a-Mg phase. [28,38] A study by Rokhlin et al indicates that RE metals decrease the solubility of each other in solid magnesium.…”

“…Efforts of traditional methods are still prevailing to improve strengths by the addition of alloying elements [26][27][28] and mechanical processing, [20,[29][30][31][32][33][34][35][36][37] as a result of their efficiency and economy. Previous works indicate that rare earth (RE) elements, especially the Y element, can improve the mechanical properties of Mg-Li alloys, [26][27][28] and even enable duplex Mg-8Li alloys to present super-plasticity.…”

“…Previous works indicate that rare earth (RE) elements, especially the Y element, can improve the mechanical properties of Mg-Li alloys, [26][27][28] and even enable duplex Mg-8Li alloys to present super-plasticity. [26] Among the mechanical processing efforts, the rolling procedure is demonstrated to introduce microstructure improvement, [20,31,32] even grains with an ultra-low grain size of~1 lm, [33] to Mg-Li alloys.…”

“…The elongation of the hot-rolled alloy is about four to five times as that of the as-cast alloy. Figure 3, the sections of the a-Mg phase in Mg-8.43Li-0.353Ymm alloy are mainly lathelike, which is also observed in Mg-8.5Li-0.5Ce, [27] Mg-6.50Li-1.17Y, [28] and Mg-9.5Li-0.6Ho [38] alloys. The length of the sections of the a-Mg phase in Mg-8.43Li-0.353Ymm alloy is near 60 lm, and in Mg-8.5Li-0.5Ce alloy, most sections of the a-Mg phase appear a length higher than 100 lm.…”

Influence of Gd, Nd and Ce Additions on Microstructures and Mechanical Properties of Ultra-light Dual Phase Mg-9Li-0.4Zr Alloys

“…In order to strengthen them, some research works have been carried out recently. Alloying Mg-Li alloys by rare-earth elements (RE) is an effective approach due to the significant improvement of RE on strength properties and room stability of magnesium alloys [9][10][11] . Many papers reported the strengthening effects of RE on Mg-Zn, Mg-Al or Mg-RE alloys [12][13][14] , but few on Mg-Li alloys, especially on high Li-containing alloy.…”