Abstract
A yield point phenomenon was observed in Al-0.16 wt%Ti alloy when specimens were stretched at room temperature after cold working and annealing under the limited conditions, for example, 1 hr at 280 to 300°C. The phenomenon was most clearly observed in a specimen annealed at 280°C rather than at higher temperatures. Electron microscope observation revealed that the annealed structure of the specimen consisted of very fine subgrains of a few microns, inside of which the dislocation density was low. Therefore, it is concluded that, in addition to locking of dislocations by added titanium, the fine subgrain structure contributes greatly to the phenomenon.
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