Abstract
Magnesium is the lightest element among the candidates for structural applications. Compared to the mainstream aluminum, titanium, and iron alloys covered in Chapters 4–6Chapter 4Chapter 5Chapter 6, whereas magnesium alloys have the potential to transition into airframe applications because of their weight advantage, they suffer from some limiting attributes that are the focus of ongoing research. The primary argument for considering magnesium alloys is built on specific properties. However, to have real opportunities for insertion, it is important that the combination of properties become competitive with aluminum alloys, as highlighted in this chapter through some examples. Concepts of microstructural efficiency and alloying efficiency are introduced. These concepts allow discussion of pathways for development of hierarchical microstructure in cost-effective magnesium alloys. Appropriate selection of alloying elements can promote synergy between microstructural and alloying efficiency.
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