High-Temperature Alloy Development and Oxidation Resistance

High-temperature alloys are critical for applications in aerospace, power generation and industrial chemical processes where materials must withstand extreme thermal and oxidative environments. The development of these alloys focuses on combining refractory metal elements such as molybdenum, niobium and titanium with silicon, boron and carbide phases to form intermetallic composites offering superior mechanical strength, creep resistance and oxidation protection at temperatures surpassing 1000 °C. Advances in compositional design, solidification processing and surface engineering have reduced the susceptibility to pest oxidation and scale spallation. Protective environmental barrier coatings and rare-earth or ceramic additions further enhance the formation of stable oxide scales, improving long-term performance. Recent research has elucidated the mechanisms of phase boundary sliding, dynamic recovery and protective scale development, underpinning the optimisation of alloy chemistries and microstructures for next-generation high-temperature service.

Research from Nature Portfolio

Recent studies have systematically characterised the ultrahigh-temperature mechanical behaviour and solidification pathways of Mo–Si–B–Ti–C based alloys. Analyses of tensile creep under vacuum conditions at 1400–1600 °C demonstrate that TiC-reinforced Mo–Si–B matrices exhibit exceptional rupture lives and moderate stress exponents, driven by phase boundary sliding between intermetallic and carbide phases coupled with dynamic recovery in the Mo solid solution. In-situ electromagnetic-levitation experiments combined with blackbody thermal analysis have mapped the complex solidification sequence of MoSiBTiC alloys, revealing a primary Mo solid solution crystallisation, followed by successive eutectic reactions involving TiC, Mo₂B and Mo₅SiB₂ phases. These findings provide a comprehensive foundation for tailoring solidification processing and alloy compositions to achieve optimised high-temperature creep and oxidation properties.

High-Temperature Alloy Development and Oxidation Resistance publication trend

The graph below shows the total number of articles in high-temperature alloy development and oxidation resistance across all publications each year (not limited to Nature Index journals).

Technical terms

Oxidation resistance: The ability of an alloy to form and maintain a protective oxide scale that inhibits further oxygen ingress and material degradation at elevated temperatures.

Creep: The time-dependent, irreversible deformation of a material under constant stress, particularly at high temperatures relative to its melting point.

Eutectic reaction: A solidification process in which a liquid transforms simultaneously into two distinct solid phases at a characteristic temperature and composition.

Refractory alloy: An alloy composed of metals with exceptionally high melting points, such as molybdenum and niobium, designed for service at extreme temperatures.

Environmental barrier coating (EBC): A surface treatment that protects underlying alloys from oxidation and corrosion by forming stable, adherent oxide or ceramic layers.

References

1. HfC–HfO 2 modified high/superhigh temperature thermal protection coating for superior hot corrosion resistance and antioxidation performance. Journal of Advanced Ceramics (2025).
2. Alloys for application at ultra-high temperatures: Nb-silicide in situ composites Challenges, breakthroughs and opportunities. Progress in Materials Science (2022).
3. Ultrahigh-temperature tensile creep of TiC-reinforced Mo-Si-B-based alloy. Scientific Reports (2018).
4. Rare Earth Elements Enhanced the Oxidation Resistance of Mo-Si-Based Alloys for High Temperature Application: A Review. Coatings (2021).
5. Study of solidification pathway of a MoSiBTiC alloy by optical thermal analysis and in-situ observation with electromagnetic levitation. Scientific Reports (2019).
6. Oxidation‐Resistant Environmental Barrier Coatings for Mo‐Based Alloys: A Review. Advanced Engineering Materials (2020).