Effect of hydrogen as a temporary β stabilizer on microstructure and brittle fracture behavior in a titanium aluminide alloy
作者： Wu-Yang Chu , Anthony W. Thompson
DOI: 10.1007/BF03350950
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摘要: Microstructures of Ti-24A1-11Nb were solution treated in either the α2 + β or phase field under vacuum hydrogen gas, followed by air (AC), furnace (FC), controlled cooling (CC), and then aged outgassed at 800°C. All mechanical tests on hydrogen-free specimens. If 1147 °C treatment (ST) was AC, as a temporary stabilizer clearly decreased size increased greatly retained transformed content. As result, room-temperature tensile strength, fracture strength (σF), ductility (ef), toughness(KIc) resulting from treating 120, 100, 60, 42 pct, respectively, compared with that vacuum. ST FC, only content but did not decrease colony; made ultimate (UTS), σf, ef, andKIc increase moderately. Cooling (1000 1075 °C), changed slightly. Properties also function crosshead speed. For all microstructures, α2/β boundaries appeared to be effective barriers slip crack initiation.
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