Microstructural Modification of Titanium Alloys

Microstructural modification of titanium alloys encompasses the deliberate control of phase distribution, grain size and morphology through alloy design, thermal and mechanical processing, and emerging fabrication techniques. At the core of this discipline is the tailoring of the α (hexagonal close-packed) and β (body-centred cubic) phase balance to achieve combinations of high strength, ductility and corrosion resistance. Traditional routes include solution treatment and ageing, thermo-mechanical processing and grain-boundary engineering, which refine the microstructure into lamellar, equiaxed or bimodal arrangements. Contemporary approaches leverage additions of trace elements—such as boron, erbium or rare-earth metals—to induce in situ precipitates and promote grain refinement. Simultaneously, additive manufacturing methods, notably selective laser melting and electron beam processes, enable rapid solidification and thermal cycling that generate unique microstructures, including martensitic α′ and refined β networks. These modifications not only enhance tensile strength and fatigue life but also improve wear and stress-corrosion performance, expanding the use of titanium alloys across aerospace, marine and biomedical sectors.

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Microstructural Modification of Titanium Alloys publication trend

The graph below shows the total number of articles in microstructural modification of titanium alloys across all publications each year (not limited to Nature Index journals).

Technical terms

Grain refinement: The reduction of average grain size in a metal, often achieved by alloying or rapid solidification, to enhance mechanical strength and toughness.

Lamellar microstructure: A layered arrangement of alternating α and β phases, which balances strength and ductility through controlled phase morphology.

Martensitic transformation: A diffusionless phase change in titanium alloys where rapid cooling converts β phase into a supersaturated, acicular α′ structure.

Selective laser melting (SLM): An additive manufacturing technique that fuses metal powder layer by layer with a high-power laser, leading to rapid heating and cooling rates.

Electron beam additive manufacturing (EBAM): A process in which an electron beam melts metal feedstock to build three-dimensional components, allowing precise thermal management and novel microstructures.

References

1. Microstructural evolution in laser melted boron alloyed Ti-6Al-4V. Journal of Alloys and Compounds (2024).
2. Effects of Trace Erbium Addition on Microstructure and Mechanical Properties of Ti6Al4V-xEr Alloys. Metals (2019).
3. Microstructure and Mechanical Properties of LaB6/Ti-6Al-4V Composites Fabricated by Selective Laser Melting. Metals (2023).
4. Effect of heat input on the microstructure and mechanical properties of Ti–6Al–4V alloy repaired by wire-feed electron beam additive manufacturing. Journal of Materials Research and Technology (2023).