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| Microstructure-tensile properties-processing technology relationships of Ti-43Al-9V-0.3Y alloy |
| ;yuyong chen;BaoHui Li |
| 哈尔滨工业大学 |
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Cite this article:
yuyong chen; BaoHui Li. Microstructure-tensile properties-processing technology relationships of Ti-43Al-9V-0.3Y alloy. Acta Metall Sin, 2008, 44(7): 815-820 .
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Abstract As-cast Ti-43Al-9V-0.3Y alloy is mainly comprised of γ phase, besides minor α2, B2 and YAl2. The alloy is fine-grained and mainly consists of lamellar structure (approximately 85 vol%). The mean colony size is about 80 μm. There is evidence of the β phase and γ phase along colony boundaries and disperse fine YAl2 particles. There exist some B2 precipitations within the lamellar colonies. As-forged Ti-43Al-9V-0.3Y alloy has the streamline near gamma (NG) microstructure drastically refined with DRX γ grains of 1~5μm. The B2 and YAl2 phases are broken and elongated and the lamellar colonies diminish. As-rolled Ti-43Al-9V-0.3Y alloy has the fine NG microstructure with γ grains of about 20μm. The streamline structure vanishes. The B2 phases with size of 8μm are distributed in the network shape along γ grains and the YAl2 particles are disperse. As-cast Ti-43Al-9V-0.3Y alloy has the ultimate tensile strength of about 510.6 and 425.8MPa, the elongation of 0.5% and 5.7%, at room temperature and 700℃, respectively. After forging and rolling, the tensile properties are greatly improved. At room temperature, the strength of as-forged and as-rolled material increases about 89~132MPa, and the elongation increases from 0.5% to 1% and 1.2%, respectively. At 700℃, the strength as-rolled material increases about 63~72MPa and the elongation increases from 5.7% to 7.9%. The improvement of the tensile properties is attributed to the microstructural refinement and higher density induced by forging and rolling process.
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Received: 21 September 2007
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