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Abstract
The effect of helium on the mechanical properties of Ti-7.5Al alloy was investigated at 873 K on the specimens injected with helium to the concentration C He of 5, 18 and 30 appm by using a cyclotron. Helium had a small effect on the yield stress but a large one on the elongation; the elongation decreased at first with increasing C He in the region of C He less than 18 appm and increased again for larger C He . Correspondingly, the deformation mode changed with the helium concentration. The deformation of uninjected specimens proceeded by the dislocation slip and two twin systems, that is, (101̄2)〈101̄1̄〉 and (112̄1)〈112̄6〉. The latter twin system disappeared in the 18 appm helium-injected specimen. Both deformation twins disappeared in the 30 appm specimen, the microstructure of which exhibited the uniform cellular structure of dislocations.
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