Abstract
Creep deformation of as-forged and heat-treated titanium aluminides, Ti-48Al with 5 and 10% volume fraction of TiB 2 , has been studied under tension in the temperature range of 649°-871°C to determine the rate-controlling mechanism. Microstructure of these alloys correspond to a mixture of equiaxed grains of γ and lamellar regions containing eutectoid γ+α 2 . Data indicate that with increase in load, stress exponent increases from one to seven. The activation energy for creep varies from 340kJ/mol to 455kJ/mol in the temperature range investigated. Creep data of these alloys were analyzed using several theoretical models.
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