Add time:08/31/2019         Source:sciencedirect.com

Publisher SummaryThe chapter describes the role of both magnesium and beryllium as aerospace structural materials, along with their limitations. Magnesium is the lightest weight of the structural alloys and its use in aerospace is very limited as it is expensive and the fabrication costs are higher because most forming operations have to be conducted at an elevated temperature. The chapter provides a comparison of magnesium alloys with aluminum alloys. Beryllium is also a lightweight metal having good strength properties and a very high tensile modulus. These properties, combined with its attractive electrical and thermal properties, have led to its use in high value aerospace electronic and guidance system applications. However, beryllium must be processed using powder metallurgy (PM) technology, which leads to high costs. Like magnesium, its hexagonal close-packed (HCP) crystalline structure greatly impairs its room temperature formability. Beryllium powder and dust are toxic, which further increases its cost through the requirement for a controlled manufacturing environment.

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