Abstract
This paper describes the low cycle fatigue and creep-fatigue of HIPed Ti-48at%Al and Ti-50at%Al intermetallics at elevated temperature. Powders of the two kinds of intermetallics made by Plasma Rotating Electrode method were HIPed to form specimens. The two types of intermetallics were simply tensioned and fatigued with fast-fast, slow-fast and fast-slow strain waves. Both the intermetallics had almost the same tensile strength which did not decrease with increasing testing temperature up to 1073K. The Ti-48at%Al intermetallic had a superior fatigue strength in comparison with the Ti-50at%Al intermetafic under the three types of strain waves. Both of the intermetallics exhibited a superior fatigue strength to a cast TiAl intermetallic.
