Substitutes

Substitutes and Alternatives for Magnesium

The availability of viable substitutes is a key factor in assessing Magnesium's criticality. Across its 3 primary applications, substitution options range from commercially viable alternatives with performance trade-offs to applications where Magnesium currently has no effective substitute.

Substitution Analysis by Application

The following table details available substitutes for Magnesium across its primary applications, including the trade-offs involved:

Performance Trade-offs

In most applications, substituting Magnesium involves measurable performance penalties. Magnesium is essential for certain aluminum alloy series (5xxx, 6xxx); no alternative provides the same strength and corrosion resistance improvements. In high-performance applications such as aluminum alloy production, these trade-offs can be particularly significant.

Research and Development

Active research programs are underway to develop improved substitutes and to reduce the amount of Magnesium required per unit of product (thrifting). However, timelines for commercializing new alternatives typically span years to decades. The limited substitutability of Magnesium is a primary driver of its high criticality rating, prompting government-funded substitution research programs.