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Abstract

A critical summary of the available knowledge on the constitutions ofa number of potentially important magnesium-based alloy systems is presented. After an initial section outlining the effects of certain addition elements on-the technological properties of magnesium, new constitutional information is presented for ternary systems containing rare-earth metals. A description is given of the phase diagrams for magnesium-rich magnesium-cerium alloys with ternary additions of aluminium, lanthanum, manganese, or silicon. This section also includes magnesium-neodymium alloys with additions of manganese, nickel, yttrium, or zinc, and magnesium -rich alloys with yttrium and manganese or zinc. Consideration of these diagrams allows a discussion of the complex quaternary systems Mg-Ce-Co-Mn, Mg-Nd-Y-Zn, and Mg-Mn-Nd-Ni. Ternary -and more complex magnesium alloys containing thorium with manganese, zinc, or zirconium, and zirconium with aluminium, lithium, or zinc are discussed in the following section. Other ternary or quaternary systems for which new work exists, or for which the phase diagrams are not readily accessible in already available compilations form the subject of the next section, and include magnesium-manganese alloys with ternary additions of calcium, tin, or zinc, the system Mg-Al-Sn, and the quaternary systems Mg-Al-Mn-Sn and Mg-Al-Ca-Mn. The remaining systems discussed include Mg-Li-Sn and Mg-Cd-Li. Systems for which only limited, but potentially important, new information exists are more briefly discussed. The final section draws attention to points of special interest, particularly in relation to the formation and characteristics of certain ternary intermediate phases, and the relationship between the concentration of valency electrons and the atomic packing sequences in Laves phases.

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Constitution of ternary and some more complex alloys of magnesium

Abstract

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