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

• Published in: Materials Vol. 14; no. 21; p. 6561
• Main Authors: Kondoh, Katsuyoshi, Kariya, Shota, Khantachawana, Anak, Alhazaa, Abdulaziz, Umeda, Junko
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01-11-2021; MDPI
• Subjects: Alloy powders; Atoms & subatomic particles; Dental implants; Differential thermal analysis; Differential thermogravimetric analysis; Ductility; Electron backscatter diffraction; Extrusion; Heat treatment; Homogenization; Investigations; Mechanical properties; Metallurgical analysis; Particle size; Plasma sintering; Powder metallurgy; Solid solutions; Tensile strength; Titanium alloys; Titanium base alloys; Yield strength; Yield stress; Zirconium dioxide; Japan
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma14216561

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.