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Researchers Turn Eggshell Waste Into Stronger Magnesium Alloys

A friction stir extrusion process converts eggshell calcium into an intermetallic during manufacturing, offering a lower-energy route to reinforcing magnesium alloys.

An egg shell.
Researchers have demonstrated a technique that uses powdered eggshells to produce high-quality magnesium alloys, which have a wide variety of automotive, aerospace and biomedical applications. The eggshells are used as a low-cost, environmentally sustainable alternative to conventional calcium materials, which are manufactured from ore using an energy-intensive process. This photo shows an eggshell next to a rod of egg-shell modified magnesium alloy. Credit: Bharat Gwalani, NC State University

Overview

  • North Carolina State researchers demonstrated a lab-scale proof of concept that mixes finely ground eggshells into a magnesium block using friction stir extrusion to produce an extruded alloy rod.
  • During the process, friction and heat convert eggshell calcium carbonate into calcium oxide and nascent calcium that react with magnesium to form Mg2Ca inside the alloy.
  • The eggshell-modified magnesium produced in tests was harder and stronger, traits valued for electronics, aerospace and biomedical parts where low weight and high strength matter.
  • The study was published open access in the Journal of Magnesium and Alloys on Sept. 30, 2026, and was supported by the Office of Naval Research Global and collaborators including Pacific Northwest National Laboratory.
  • Authors say the method could cut processing steps, use low-cost biowaste instead of mined calcium, and apply to other material systems, but the work remains a laboratory demonstration that needs scale-up and industrial validation.