Abstract
ABSTRACT The results of a recent study of the effects of interstitial elements and microalloying with 0.2 at.% W on the tensile and fracture properties of Ti-48Al (compositions quoted in atomic % unless stated otherwise) base gamma alloys are presented in this paper. Lower interstitial oxygen levels are shown to promote higher levels of tensile ductility at the expense of yield/ultimate tensile strength and fracture toughness. Microalloying with W is also shown to result in microstructural instability and a concomitant degradation in tensile and fracture properties. Ductility and yield/ultimate tensile strengths in binary gamma alloys at room - and elevated-temperature are shown to exhibit a simple Hall-Petch dependence on the average grain/lamellar packet size. The observed Hall-Petch behavior is found to be independent of lamellar volume fraction and fracture mechanism at room- and elevated-temperature. The implications of the results are discussed for future alloy/process development.
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