Abstract
Tensile creep tests of the Ti–48at.%Al PST crystals with different lamellar orientation angles with respect to the stress axis φ were conducted at 1148 K and 68.6 MPa and the φ dependence of creep rate was investigated. The creep rate of the PST crystal strongly depends on φ. The minimum creep rate of the PST crystal with φ=63° is three orders of magnitude larger than that of the PST crystal with φ=3°, and the rupture life of the PST crystal with φ=63° is one-tenth of that of the PST crystal with φ=3°. The marked differences in creep rate and rupture life between the PST crystal with φ=63° and that with φ=3° would be ascribed to the role of α 2 plate to the operative slip systems. To confirm the above supposition, creep interruption tests in the wide strain range were conducted for the PST crystal with φ=63°. The microstructure of the creep interrupted specimens gives the evidence to understand the role of α 2 plate to creep property, that is, the evolution of subgrain occurs just after collapsing of the α 2 plates, and the collapse of the α 2 plates directly coincides with the onset of accelerating creep.
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