Effect of precipitation from tweed matrix on the mechanical properties in a metastable beta alloy of Ti-15-3 |
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Authors: | Byung-Hak Choe Soo-Keun Shin Sung-Joon Kim Yong-Tai Lee S. B. Kang Masuo Hagiwara |
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Affiliation: | (1) Department of Metal and Materials Engineering, Kangnung National University, Jibyeon-dong, Gangneung-si, 210-702 Gangwon, Korea;(2) Korea Institute of Machinery and Materials, 66 Sangnam-dong, Changwon-si, 641-010 Gyeongnam, Korea;(3) National Institute for Materials Science, Tsukuba, Japan |
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Abstract: | The effects of aging treatment on the microstructures and mechanical properties of a metastable beta titanium alloy Ti-15-3 (Ti−15V−3Al−3Sn-3Cr) have been investigated with hardness measurements, tensile test, and optical and electron microscopy. Precipitate-free beta structure with average grain size of about 56 μm was obtained after solution treatment at 800°C for 15 min followed by air cooling. Solution treated specimens were aged up to 800 h in the temperature range between 350 and 600°C. The morphology of the precipitates was varied significantly, depending on the aging temperature. The fine aggregates of α precipitates were dominant above 450°C. Peak hardness values were maintained up to 800 h at 500°C, which showed the superior thermal stability of α precipitates. Tensile strength increased up to 1600 MPa along with the decrease of elongation after aging at 350 and 400°C. |
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Keywords: | Ti-15-3 aged hard ening α precipitates metastable β |
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