Metallurgical Abstracts on Light Metals and Alloys vol.55
The Influence of Thermal Oxidation on Hardness and Microstructure of Beta-Type Titanium Alloy Ti-29Nb-13Ta-4.6Zr (TNTZ)
Zuldesmi*, Agri Suwandi**, Jemmy Charles Kewas*, Maykel Manawan***, Gunawarman****,
Mitsuo Niinomi***** and Toshikazu Akahori*****
*Mechanical Engineering Study Program, Faculty of Engineering, Universitas Negeri Manado
**Mechanical Engineering Department, Faculty of Engineering, Universitas Pancasila
***Power-Motion Technology, Faculty of Defense Technology, Indonesia Defense University
****Mechanical Engineering Department, Faculty of Engineering, Universitas Andalas
*****Faculty of Science and Technology, Meijo University
[Published in Fluid Mechanics and Thermal Sciences, Vol. 96(2022), pp. 127–136]
https://doi.org/10.37934/arfmts.96.1.127136
E-mail: akahori[at]meijo-u.ac.jp
Key Words: titanium alloy, TNTZ, thermal oxidation, hardness, microstructure
Thermal oxidation is one of the simple and low-cost methods that can improve tribological characteristics of titanium and its alloys by generating a protective layer on their surfaces. In this study, the experiment parameters were applied on thermal oxidation (TO) at 598, 673 and 723K for 40, 50 and 60s on TNTZ. The micro-Vickershardness tests and microstructure analysis were performed for specimens before and after TO. The results exhibited that the hardness of TNTZ was increased by increasing TO temperature, but it was decreased by enlarging of TO time. Metallographic tests showed that oxidised TNTZ have equaxial β grains with a grain size approximately about 20 to 30μm. No significant change of microstructure (e.g. grain size) was detected after increasing TO temperature because the short time oxidation process was applied.
XRD patterns of TNTZ subjected to thermal oxidation processing at a temperature of 723K for 40, 50, and 60s.