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

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 precip...

Full description

Saved in:
Bibliographic Details
Published in:Scripta materialia 2018-09, Vol.154, p.139-144
Main Authors: Mantri, S.A., Choudhuri, D., Alam, T., Viswanathan, G.B., Sosa, J.M., Fraser, H.L., Banerjee, R.
Format: Article
Language:English
Subjects:
3-D atom probe tomography
Beta titanium alloys
Mechanical behavior
Phase transformations
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2018.05.040