Quantitative Strengthening Evaluation of Powder Metallurgy Titanium Alloys with Substitutional Zr and Interstitial O Solutes via Homogenization Heat Treatment

Katsuyoshi Kondoh; Shota Kariya; Anak Khantachawana; Abdulaziz Alhazaa; Junko Umeda

doi:10.3390/ma14216561

Quantitative Strengthening Evaluation of Powder Metallurgy Titanium Alloys with Substitutional Zr and Interstitial O Solutes via Homogenization Heat Treatment

Materials (Basel). 2021 Nov 1;14(21):6561. doi: 10.3390/ma14216561.

Authors

Katsuyoshi Kondoh¹, Shota Kariya¹, Anak Khantachawana², Abdulaziz Alhazaa^{3

4}, Junko Umeda¹

Affiliations

¹ Department of Composite Materials Processing, Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Osaka 567-0047, Ibaragi, Japan.
² Department of Mechanical Engineering, King Mongkut's University of Technology Thonburi (KMUTT), 126 Pracha Uthit Rd., Bang Mod, Thung Khru, Bangkok 10140, Thailand.
³ King Abdullah Institute for Nanotechnology, King Saud University, 2454, Riyadh 11451, Saudi Arabia.
⁴ Tribology, Surface, and Interface Sciences (TSIS), Physics and Astronomy Department, College of Science, King Saud University, 2454, Riyadh 11451, Saudi Arabia.

Abstract

The decomposition behavior of ZrO₂ particles and uniform distribution of Zr and O solutes were investigated by employing in situ scanning electron microscope-electron backscatter diffraction (SEM-EBSD) analysis and thermogravimetric-differential thermal analysis (TG-DTA) to optimize the process conditions in preparing Ti-Zr-O alloys from the pre-mixed pure Ti powder and ZrO₂ particles. The extruded Ti-Zr-O alloys via homogenization and water-quenching treatment were found to have a uniform distribution of Zr and O solutes in the matrix and also showed a remarkable improvement in the mechanical properties, for example, the yield stress of Ti-3 wt.% ZrO₂ sample (1144.5 MPa) is about 2.5 times more than the amount of yield stress of pure Ti (471.4 MPa). Furthermore, the oxygen solid-solution was dominant in the yield stress increment, and the experimental data agreed well with the calculation results estimated using the Hall-Petch equation and Labusch model.

Keywords: decomposition; grain refinement; homogenization; powder metallurgy Ti-Zr-O alloy; solid-solution; water-quenching.