Low-cost and high-strength powder metallurgy Ti–Al–Mo–Fe alloy and its application
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Low-cost and high-performance are main research directions of structural titanium alloys. In this study, a two-phase structural Ti–5Al–3Mo–2Fe alloy was designed and prepared through elemental powder metallurgy (P/M) process, including cold isostatic processing, vacuum sintering, hot rolling and heat treatment. Results indicate that the P/M Ti–5Al–3Mo–2Fe alloy has a multi-phase microstructure with equiaxial primary α phase, needlelike secondary α phase and retained β phase. The room-temperature yield and ultimate strength reach to 1303 MPa and 1422 MPa, respectively, with a balanced elongation of 8.5%. At 400 °C, the alloy still has a high yield strength, ultimate strength and elongation of 850 MPa, 935 MPa and 17%, respectively. The Ti–5Al–3Mo–2Fe alloy was successfully processed into intake valves of automobile engine, which passed the engine test and meet the serving requirement.
This study was supported by the National Natural Science Funds for Distinguished Young Scholar of China (51625404), Hunan Natural Science Foundation of China (2017JJ2311), Major Project of Collaborative Innovation of Production and Research in Guangzhou (201508030032), Guangdong Natural Science Foundation of China (51404077) and (2015A030313775).
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Conflict of interest
The authors state that there is no conflict of interest in this work.
- 5.Yan M (2014) Microstructural characterization of as-sintered titanium and titanium alloys. In: Ma Q, Froes FH (eds.) Titanium powder metallurgy, vol 32, Elsevier, Netherlands, pp 555–574, ISBN: 978-0-12-800054-0Google Scholar
- 19.Collings EW (1994) Materials properties handbook: titanium alloys. ASM, Materials Park, pp 10–15Google Scholar
- 40.Devaraj A, Joshi VV, Srivastava A, Manandhar S, Moxson V (2016) A low-cost hierarchical nanostructured beta-titanium alloy with high strength. Nat Commun 7; Article Number: 11176Google Scholar