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Applications & Industries · · 5 min read
Why a defence platform cannot simply switch alloys
Substituting a material in a weapons system is an administrative problem before it is a metallurgical one, and the documents that make it so are public.
Pending review
The short version
A defence programme changes materials slowly, and the reason sits in documents rather than in metallurgy. A metal that is trusted in a platform has been written into a design-allowables handbook, its supplier listed in advance of any particular contract, and the processes applied to it accredited separately. The Federal Acquisition Regulation states that 'Generally, qualification is performed in advance and independently of any specific acquisition action' — which is precisely what makes it slow to repeat for a newcomer.
Three documents a material has to get into
The first is a properties handbook. The FAA, announcing in 2005 the availability of the proposed Metallic Materials Properties Development and Standardization Handbook and requesting public comment on it, described the handbook it is proposed to replace, MIL-HDBK-5, as one that 'continues to be used as a primary source of statistically based design allowables for metallic materials and fastened joints used in the U.S. military and commercial aerospace design'. Design allowables are the numbers a stress engineer is permitted to assume. A material without them is not forbidden; it is simply not usable in a calculation anyone will sign. Battelle, which says it has 'played a central role in' the MMPDS project, describes the handbook's scope as statistically based allowables for more than 400 material specifications and joint allowables for more than 100 fastener/material combinations.
The second is a list of who may supply. The FAR sets out qualification as the process by which products are examined and tested for compliance with specification requirements, or potential offerors are given an opportunity to demonstrate their abilities to meet the standards specified, after which the successful names 'are included in a Federal or Military QPL, QML, or QBL'. The list exists before the requirement does.
The third is accreditation of the process rather than the product. Nadcap, described by the body that administers it as 'an industry-managed program that brings together companies and suppliers in the Aviation, Defense, and Space (ADS) sectors to oversee accreditation for critical processes', covers processes such as heat treating, welding and non-destructive testing. A supplier can hold the right metal and still not be permitted to heat-treat it.
The sentence that shows qualification is the constraint
The clearest public evidence that this architecture, not chemistry, is the binding constraint comes from a trade investigation. Reporting in 2021 on titanium sponge — the intermediate from which titanium metal is made — the Bureau of Industry and Security stated that titanium sponge 'is essential to the manufacturing and maintenance of U.S. defense systems', and, in the sentence that matters here, that only the United States, Japan, Russia, and Kazakhstan had titanium sponge plants certified to produce aerospace rotating-quality sponge.
Certified is the operative word. Titanium sponge is made in more places than that; sponge that a rotating engine part may legally be forged from is made in four countries, as of a 2021 finding whose sourcing assumptions have since been overtaken by events. The scarcity is in the certification, and the certification is what a new entrant has to acquire. What acquiring it costs in time is a separate question with its own article: Why new capacity is not new supply for years carries the sampling burden of entering the allowables handbook, and the only dated public instance of a plant working through certification.
The metal is not the hard part. The permission to use the metal is the hard part, and permission is granted to a plant, not to an element.
Where the magnets sit, and what that locks in
The same pattern appears on the rare-earth side, with a wrinkle. Reviewing the defence supply chain in 2010, the GAO found that fin actuators used in precision-guided munitions are 'specifically designed around the capabilities of neodymium iron boron rare earth magnets' — designed around, not merely using. It also noted that the Aegis Spy-1 radar, 'which is expected to be used for 35 years, has samarium cobalt magnet components that will need to be replaced during the radar's lifetime'. Those are two different magnet chemistries and should not be blurred together; what they share is a service life measured in decades, over which the specification does not move.
Fourteen years later the GAO restated why the material matters, reporting that neodymium-iron-boron magnets and other rare earth permanent magnets 'are extremely strong, can retain magnetic strength at elevated temperatures, and operate under demanding conditions—characteristics that are vital for DOD weapon systems', and that DOD had assessed that 'it can take a decade or longer to establish new domestic sources for rare earths'. That is the department's own assessment as GAO reports it, and 'or longer' is open-ended.
What is not established here
Two things worth naming. First, the decade-scale figures above are about building mines and refineries, not about qualifying a supplier into a platform; they are different problems and are not interchangeable. The nearest sourced figure for an approval step is narrower and heavily hedged: an aviation source-approval handbook states that normally the source approval request review must be accomplished within 180 days, 'unless otherwise negotiated with the procuring activity or as documented in Service specific guidance'. That is one review, not a total.
Second, none of the documents read for this article puts a cost on qualification. The absence is worth stating rather than filling, because it is the number the argument would most obviously want.
Related
- Why new capacity is not new supply for years (Markets & Economics · Supply) — what acquiring these approvals costs in time, and why financing arrives last
- Aerospace — the same qualification architecture, without the procurement layer
- Titanium/Rutile — the mineral behind the sponge
- Rare Earths — the magnet chain the GAO reports on
- Export Controls and National Security — the policy machinery that surrounds these findings
Sources
- PRIMARYFederal Acquisition Regulation 9.203, 48 CFR § 9.203 — 'Qualified Products Lists, Qualified Manufacturers Lists, and Qualified Bidders Lists', quoted from the Cornell Legal Information Institute reproduction of the CFR. Defines qualification and listing, and states that 'Generally, qualification is performed in advance and independently of any specific acquisition action.'
- PRIMARYFederal Aviation Administration (DOT), 'Metallic Materials Properties Development and Standardization (MMPDS) Handbook', Federal Register notice 70 FR 18452, 11 April 2005 — MMPDS as the successor to MIL-HDBK-5 and its role in commercial aircraft certification. A 2005 notice; dated in the text.
- SECONDARYBattelle, 'Metallic Materials Properties Development and Standardization (MMPDS)' information sheet, January 2024 — 'the primary source of statistically based material allowables for more than 400 material specifications and joint allowables for more than 100 fastener/material combinations'. Published by Battelle, which states it has 'played a central role in' the MMPDS project.
- SECONDARYPerformance Review Institute, 'Nadcap' (programme description, undated) — Nadcap as 'an industry-managed program that brings together companies and suppliers in the Aviation, Defense, and Space (ADS) sectors to oversee accreditation for critical processes.'
- PRIMARYBureau of Industry and Security, U.S. Department of Commerce, 'Publication of a Report on the Effect of Imports of Titanium Sponge on the National Security', 86 FR 59115, 26 October 2021 — titanium sponge as essential to defence systems; 'only the United States, Japan, Russia, and Kazakhstan have titanium sponge plants certified to produce aerospace rotating-quality sponge'. A 2021 statement; sourcing patterns have since changed and the article dates it.
- PRIMARYU.S. Government Accountability Office, 'Rare Earth Materials in the Defense Supply Chain', GAO-10-617R, 14 April 2010 — fin actuators 'specifically designed around the capabilities of neodymium iron boron rare earth magnets'; the Aegis Spy-1 radar 'expected to be used for 35 years' with samarium cobalt magnet components. A 2010 report, dated throughout.
- PRIMARYU.S. Government Accountability Office, 'Critical Materials: Action Needed to Implement Requirements That Reduce Supply Chain Risks', GAO-24-107176, 10 September 2024 — properties of rare-earth permanent magnets in DOD weapon systems; 'DOD assessed that it can take a decade or longer to establish new domestic sources for rare earths' (GAO reporting DOD's assessment, not GAO's own finding).
- PRIMARY'Aviation Source Approval and Management Handbook', 16 March 2011, hosted by the Defense Logistics Agency — 'Normally, the SAR review process must be accomplished within 180 days, unless otherwise negotiated with the procuring activity or as documented in Service specific guidance.' This is a review step, not the total time to qualify a supplier.
- UNVERIFIEDGAP — no cost figure for qualifying a material or a supplier into a defence platform was obtained from any source read for this article. Searched: GAO-10-617R, GAO-24-107176, the DLA source-approval handbook and the FAR. None states one.Non-public document · no public URL
- UNVERIFIEDGAP — SAE AMS specifications for titanium alloys (e.g. AMS 4911, AMS 4928) are paywalled and were not read. No AMS content is quoted in this article, and the specifications are described only by the role attributed to them in documents that were read.Non-public document · no public URL
