As additive manufacturing (AM) becomes more widely used in the aerospace industry, the biggest gatekeeper to the development of next-generation AM components for aerospace applications is the high-performance powders and alloys that must meet extreme strength, temperature, life-cycle, and traceability demands. Without flight-qualified materials, even the most advanced 3D printed components won’t see lift-off. In AM, materials are not passive inputs (see “Additive Manufacturing in Aerospace: Applications, Materials & Trends” for a broader overview). They dictate feasible manufacturing processes, achievable microstructures, part lifecycle, qualification pathways, and ultimately, whether the component can be used. For metals in particular, understanding the structure-process-property-performance relationship is imperative when using AM to produce aerospace components. For example, printing parameters influence melt pool dynamics, solidification rate, porosity, grain morphology, and precipitation hardening, which in turn determine strength, fatigue resistance, oxidation behavior, and post-processing requirements.1 As a result, aerospace AM part qualification must cover metal powder production, batch-to-batch consistency, machine operation, and performance testing of the final part. Metals used in aerospace AM applications are deeply tied to global supply chains, with the United States being import-reliant for multiple elements commonly used in AM alloys, including titanium, nickel, niobium, tungsten, chromium, and cobalt.2,3 Production of these minerals is often highly concentrated by country, which can lead to disruptions that affect the end-to-end process, from powder feedstock production to part qualification and serial part production. Alloys for AM in Aerospace The most widely used alloy categories for aerospace AM are those with decades of well-characterized properties and mature qualification pathways. These alloys remain dominant in the industry due to their proven performance in real-world flight environments, adherence to existing standards and certification guidelines, and stable material supply chains. Titanium alloys, including Ti-6Al-4V, are widely used for aerospace components as they offer excellent strength-to-weight ratio, corrosion resistance, and performance at moderately high temperatures.4,5 Minimizing oxidation of titanium alloys at high temperatures is critical due to the formation of a thicker oxide layer that makes the part more brittle and reduces toughness. Powder reuse must be carefully tracked to prevent unwanted chemical composition changes and potential embrittlement. Common titanium-based parts include aircraft brackets, engine pylons, and spacecraft lattice structures and propellant system hardware.4 Nickel-based superalloys, such as Inconel 625, 718, and 939, are used for high-temperature components, including turbine engines, exhaust systems, combustors, and hypersonic parts.6,7 The nickel-based superalloys maintain mechanical strength and are oxidation and creep-resistant at high temperatures. However, nickel-based alloys are prone to solidification cracking and porosity during AM processing if the parameters are not optimized. These alloys are expensive, and recycling/scrap recovery remains inefficient. Aluminum alloys, including AlSi10Mg and Sc- or Zr- modified alloys, are critical for low-density applications, as they are lightweight and easy to process and produce parts with good dimensional accuracy and surface finishes.5,8,9 These casting-friendly aluminum alloys are commonly used for cabin structures, electronics housings, and non-pressurized load-bearing supports.5 The main challenges associated with aluminum alloys are high residual stress, distortion, and solidification cracking leading to fatigue sensitivity that requires surface finishing and post-processing to minimize these problems. Certain aerospace-focused aluminum alloys such as Al7075 and Al6061 are only now being qualified for use in AM aerospace applications. Novel Alloy Categories Emerging for AM in Aerospace In addition to optimizing current alloys used in aerospace AM and streamlining their qualification pathways, the industry is also developing next-generation alloys with application-specific material properties. Oxide-dispersion-strengthened (ODS) superalloys, composed of a metal matrix with oxide nanoparticles dispersed within the matrix, offer higher temperature capabilities than nickel-based superalloys but are more challenging to produce using traditional manufacturing methods. NASA developed the GRX-810 alloy, a nickel-cobalt-chromium alloy with a ceramic-oxide dispersion using computational modeling and 3D printing. GRX-810 offers improved creep resistance, strength, and durability at extremely high temperatures.5,10 High-entropy alloys (HEAs) are composed of four or more principal elements in roughly equal proportions, differing from traditional alloys, which are centered around one dominant element (i.e., iron in steel, nickel in superalloys). AM is an ideal processing pathway for HEAs as the rapid solidification results in a “frozen” complex microstructure that is not attainable with casting or forging methods.5,11,12 Additionally, HEAs can be tailored for extreme environments, exhibiting superior strength and ductility at the extremes of the temperature spectrum and enhanced resistance to microstructure changes, corrosion, and oxidation. Examples include CoCrFeMnNi alloys, ideal for space hardware, and refractory HEAs such as MoNbTaW, ideal for hypersonic thermal structures, turbine hot sections, and reusable space propulsion parts.11,12 Although HEAs show promise for AM in aerospace, limited application data, HEA powder instability during atomization and handling, and a lack of established qualification pathways and associated standards all present barriers to widespread adoption of these materials. Supply Chain Bottlenecks and Scaling Hurdles for Metals in Aerospace AM The growth of AM in the aerospace sector is tightly coupled to the availability, processing, quality, and geopolitical reliability of critical elements. The elements used for AM in aerospace applications rely on minerals that face varying degrees of supply chain constraints, according to findings from the U.S. Geological Survey (USGS) (Fig. 1).2Elemental composites.According to the 2025 USGS Mineral Commodity Summaries, the U.S. is 100% import-reliant on 12 critical minerals and over 50% import-reliant on an additional 28 critical minerals (Fig. 2).2 There has been a recent resurgence in domestic mining, production, and reclamation efforts, with funding opportunities from the Department of Defense, Defense Logistics Agency, and Department of Energy.13–15 Industrial AM companies, such as EOS GmbH and Continuum Powders, have rolled out programs to recycle metal powder composed of critical minerals without changing material properties or sacrificing powder quality, essentially creating new or “virgin” metal alloy powders.16,17 Such efforts indicate an industry-driven need to improve supply chain resilience for critical materials to meet aerospace AM demands. Materials are a key enabler for the next generation of additive manufacturing in aerospace applications. Emerging alloys promise performance leaps, but only if we mature qualification pathways and build resilient supply chains. The convergence of domestic mining and recycling, public-private R&D, and certified AM production opens the door to unlocking new capabilities in the long term. References: (1) Knoepfel, A. Additive Manufacturing in Aerospace: Applications, Materials & Trends. IMTS+. September 24, 2025. https://www.imts.com/read/article-details/Additive-Manufacturing-in-Aerospace-Applications-Materials-Trends/2163/type/Read/1/tab/all-articles?page=1 (accessed 2025-08-10). (2) U. S. Geological Survey. Mineral Commodity Summaries 2025; 2025. https://pubs.usgs.gov/periodicals/mcs2025/mcs2025.pdf (accessed 2025-11-25). (3) Bradstock, F. U.S. Critical Minerals Supply Strategy to Reduce China Dependence | Shale Magazine. https://shalemag.com/us-critical-minerals-supply-strategy/?utm_source=chatgpt.com (accessed 2025-11-05). (4) Mosallanejad, M. H.; Abdi, A.; Karpasand, F.; Nassiri, N.; Iuliano, L.; Saboori, A. Additive Manufacturing of Titanium Alloys: Processability, Properties, and Applications. Advanced Engineering Materials. John Wiley and Sons Inc December 1, 2023. https://doi.org/10.1002/adem.202301122. (5) Georgantzinos, S. K.; Papadopoulou, E.; Kostopoulos, G.; Voulgaris, S.; Tseni, A.; Bakalis, P.; Gkara, M.; Mitropoulou, C. C.; Lagaros, N. D. A Comprehensive Review of Additive Manufacturing for Space Applications: Materials, Advances, Challenges, and Future Directions. Adv Eng Mater 2025, 27 (22), e202501082. https://doi.org/10.1002/ADEM.202501082.(6) English, C. L.; Tewari, S. K.; David, ; Abbott, H. An Overview of Ni Base Additive Fabrication Technologies for Aerospace Applications. (7) Georgantzinos, S. K.; Papadopoulou, E.; Kostopoulos, G.; Voulgaris, S.; Tseni, A.; Bakalis, P.; Gkara, M.; Mitropoulou, C. C.; Lagaros, N. D. A Comprehensive Review of Additive Manufacturing for Space Applications: Materials, Advances, Challenges, and Future Directions. Adv Eng Mater 2025, 27 (22), e202501082. https://doi.org/10.1002/ADEM.202501082.(8) Srivastava, M.; Rathee, S.; Patel, V.; Kumar, A.; Koppad, P. G. A Review of Various Materials for Additive Manufacturing: Recent Trends and Processing Issues. Journal of Materials Research and Technology. Elsevier Editora Ltda November 1, 2022, pp 2612–2641. https://doi.org/10.1016/j.jmrt.2022.10.015. (9) Pant, M.; Pidge, P.; Nagdeve, L.; Kumar, H. A Review of Additive Manufacturing in Aerospace Application. Revue des Composites et des Materiaux Avances. International Information and Engineering Technology Association April 1, 2021, pp 109–115. https://doi.org/10.18280/RCMA.310206. (10) Smith, T.; Gradl, P.; Kantzos, C. GRX-810: A 3D Printable Alloy Designed for Extreme Environments Background-NASA Application. (11) Taghian, M.; Meibody, A. P.; Saboori, A. Challenges and Opportunities in Additive Manufacturing of High Entropy Alloys. J Alloys Compd 2025, 1034. (12) Abdullah, M. R.; Peng, Z. Review and Perspective on Additive Manufacturing of Refractory High Entropy Alloys. Mater Today Adv 2024, 22, 100497. https://doi.org/10.1016/J.MTADV.2024.100497. (13) Chapman, B. Recent U.S. Government Policy Literature on Critical and Strategic Recent U.S. Government Policy Literature on Critical and Strategic Minerals Minerals; 2025. https://doi.org/10.21140/mcuj.20251601003. (14) Energy Department Announces Actions to Secure American Critical Minerals and Materials Supply Chain | Department of Energy. https://www.energy.gov/articles/energy-department-announces-actions-secure-american-critical-minerals-and-materials-supply?utm_source=chatgpt.com (accessed 2025-11-05). (15) Zhang, H. Resilience of Critical Transition Minerals Supply Chain in the Context of Strategic Rivalry: Implications for the National Policy and Regulatory Frameworks. Journal of Energy & Natural Resources Law 2025. https://doi.org/10.1080/02646811.2025.2495920. (16) Responsible Aluminium Recycling for AM | EOS GmbH. https://www.eos.info/content/blog/the-benefits-of-recycling-in-additive-manufacturing (accessed 2025-11-25). (17) Recycled Metal In Aerospace: Proven Practice, Evolving Potential | Continuum Powders. https://www.continuumpowders.com/recycled-metal-in-aerospace-proven-practice-evolving-potential/ (accessed 2025-11-25).
Additive manufacturing in aerospace depends on high-performance metal powders and resilient supply chains. Emerging alloys offer advances, but qualification and scalability remain key challenges.
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