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Low-cost and high-strength powder metallurgy Ti–Al–Mo–Fe alloy and its application
- Xu, Rongjun, Liu, Bin, Yan, Zhiqiao, Chen, Feng, Guo, Wenmin, Liu, Yong
- Journal of materials science 2019 v.54 no.18 pp. 12049-12060
- alloys, ambient temperature, automobiles, cold, heat treatment, metallurgy, microstructure, titanium
- 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.