Tuning the scale of α precipitates in β-titanium alloys for achieving high strength

By S. Mantri, D. Choudhuri, T. Alam, G. Viswanathan, J. Sosa, H. Fraser, Rajarshi Banerjee. Scripta Materialia, 2018

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Abstract The strength of a commercial β‑titanium alloy was tuned by systematically controlling the size-scale of α precipitation via two-step heat treatments. While the first step annealing at 350 °C forms the precursor metastable ω phase, the subsequent annealing at 600 °C/1H resulted in fine-scale α precipitation. We find that annealing duration at 350 °C greatly impacts the α size-scale and, this consequently can be used to tune the ultimate tensile strength (UTS) from ~1 to 2 GPa. A combination of high volume-fraction of non-shearable super-refined α precipitates, coupled with their pyramidal arrangement, and a constrained β matrix leads to very high strength.

Subfields: Materials Chemistry, Mechanical Engineering, Metals and Alloys

View Paper: https://www.semanticscholar.org/paper/5202c3bbee6f8b5fb93a636fd651a3b54d2b8b95