Abstract
The intermetallic alloy Ti–47Al–2W–0.5Si (at.%) has been homogeneously implanted with 4He2+ ions under uniaxial tensile stresses from 20 to 450MPa to a maximum dose of about 0.16dpa (1370appm-He) with displacement damage rates of 2×10−6dpas−1 at temperatures of 573 and 773K. Strain under implantation was determined by Linear Variable Displacement Transformer (LVDT), while changes of microstructure were investigated after implantation by Transmission Electron Microscopy (TEM). Irradiation creep strain showed a pronounced transient behaviour, virtually independent of temperature, with a stress dependence which can be approximately described by a creep compliance of 8×10−6dpa−1MPa−1 up to stresses of 350MPa. The microstructure of the as-received material consisted of a patch-work of mainly lamellar γ/α2 colonies and equiaxed γ-grains with islands of precipitates. Only ‘black dot’ damage was observed after implantation at 573K under different stresses, while implantation at 773K yielded a dense population of bubbles and dislocation loops, mostly mutually attached.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.