Ductility improvement mechanism of pure titanium with excessive oxygen solid solution via rapid cooling process

Kariya, S, Umeda, J, Ma, Q and Seiichi, K 2018, 'Ductility improvement mechanism of pure titanium with excessive oxygen solid solution via rapid cooling process', Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, vol. 82, no. 10, pp. 390-395.


Document type: Journal Article
Collection: Journal Articles

Title Ductility improvement mechanism of pure titanium with excessive oxygen solid solution via rapid cooling process
Author(s) Kariya, S
Umeda, J
Ma, Q
Seiichi, K
Year 2018
Journal name Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume number 82
Issue number 10
Start page 390
End page 395
Total pages 6
Publisher Nihon Kinzoku Gakkai, Japan Institute of Metals
Abstract Oxygen solid solution has been well known to have a high hardening effect on Ti and its alloys, while it also imposes a serious embrittlement behavior. This study investigated the effect of a rapid cooling process by water quenching (WQ) after heat treatment on the microstructures and mechanical properties of powder metallurgy (PM) α-titanium (Ti) materials with dissolved 0.94 mass% oxygen (O) to clarify their ductility improvement mechanism. The water quenching was applied to PM Ti extruded rod after isothermal annealing at 1173~1373 K. Tensile test results at the ambient temperature indicated that the elongation to failure of the quenched ones at 1223 K and 1273 K was 12.5% and 19.1%, respectively. They are significantly higher than that of as-extruded Ti specimen (6.0%). The Ti-0.94 mass% O materials via the above WQ treatment mainly consisted of equiaxed α-Ti grains, and some martensite phases were also detected at the grain boundaries. They were formed from β phases during phase transformation during WQ due to a lower oxygen content in pre-β phases compared to pre-α phases. The pre-β phase also had a high concentration of dislocation after tensile test. The significantly increased elongation was due to a lower oxygen content phase formation assuming an important role to improve the plastic deformation ability.
Subject Metals and Alloy Materials
Keyword(s) Ductility improvement
Oxygen
Rapid cooling
Solid solution
titanium
DOI - identifier 10.2320/jinstmet.JAW201810
Copyright notice © 2018 The Japan Institute of Metals and Materials
ISSN 0021-4876
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