The Elevated-Temperature Strength Enhancement of a Low-Cost β Titanium Alloy Through Thermomechanically-Induced Phase Transformation

Khademi, V.; Ikeda, M.; Hernández-Escobar, D.; Boehlert, C. J.

doi:10.1007/s11837-019-03598-2

Title: The Elevated-Temperature Strength Enhancement of a Low-Cost β Titanium Alloy Through Thermomechanically-Induced Phase Transformation

Journal Article · 19 June 2019 · JOM. Journal of the Minerals, Metals & Materials Society

DOI: https://doi.org/10.1007/s11837-019-03598-2 · OSTI ID:1595235

Khademi, V. ^[1]; Ikeda, M. ^[2]; Hernández-Escobar, D. ^[3];

^[3]

Michigan State Univ., East Lansing, MI (United States); michigan state university
Kansai Univ., Suita (Japan)
Michigan State Univ., East Lansing, MI (United States)

The effects of temperature and thermomechanical loading on the tensile strength and hardness were studied for a rolled, low-cost metastable β titanium alloy, Ti-13Cr-1Fe-3Al (wt.%). Tensile tests were performed at temperatures between room temperature (RT) and 410°C. The results indicated that the ultimate tensile strength (UTS) decreased with increasing temperatures up to 300°C. However, the UTS was 1400 MPa at 410°C, which was approximately 150% higher than the RT UTS. It is believed that the formation of nanoscale ω and α precipitates, identified using transmission electron microscopy, hindered the dislocation motion, which resulted in the exceptionally high UTS at 410°C. However, ductility was maintained, as the elongation-to-failure (ϵ_f) was 10% at 410°C. Dynamic mechanical analysis suggested that phase transformations occurred between 370°C-475°C. To evaluate the effect of the phase transformations on the hardness, the as-received material was heat treated at 400°C, 450°C, and 500°C for 2 h, which resulted in hardness values of approximately 340 Hv, 380 Hv, and 470 Hv, respectively. However, the greatest hardness value (500 Hv) was exhibited by the as-received material after it was tensile tested at 410°C. This suggested that both temperature and loading history affected the phase transformations. Finally, as all the samples exhibited a ductile fracture mode, this work indicates that it is possible to maintain both high strength and adequate ϵ_f for Ti-13Cr-1Fe-3Al (wt.%).

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Research Organization:: Michigan State Univ., East Lansing, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0001525; SC0001525

OSTI ID:: 1595235

Journal Information:: JOM. Journal of the Minerals, Metals & Materials Society, Journal Name: JOM. Journal of the Minerals, Metals & Materials Society Journal Issue: 10 Vol. 71; ISSN 1047-4838

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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