|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||F-35: Microstructure and Mechanical Properties of Powder Metallurgy Ti-22Al-25Nb Alloy Fabricated by Hot-pressing Sintering
||Yu Sun, Heng Zhang, Siqiu Wang, Lianxi Hu
|On-Site Speaker (Planned)
In the present investigation, vacuum hot-pressing sintering processing was employed to fabricate Ti-22Al-25Nb alloy in a temperature range of 1000oC-1150oC with a pressure of 40MPa for 1h. Microstructure and phase composition examinations were conducted by applying optical microscopy, scanning electron microscope and X-ray diffraction analysis. Tensile tests of this alloy were studied at room temperature and 650oC, respectively. The results indicated that the main phases of samples are B2 and O with a small amount of α2 phase distributed along the grain boundaries. The yield strength and elongation of the hot-pressed samples were 737.90MPa and 5.607% at room temperature, respectively, while the yield strength reduced to 522.75MPa and the elongation reached 16.66% at 650oC. The alloy sintered at 1100oC exhibited better comprehensive mechanical properties.
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