Abstract
Tensile tests for the Ti-15V-3Cr-3Sn-3Al alloys with different initial structures have been conducted by means of a constant cross-head speed method (constant method) and a cross-head speed jumping method (jumping method) at temperatures around the β transus. For specimens with relatively large grain sizes ranging between 15 and 170μm, the strain rate giving the maximum total elongation moves to higher values with decreasing grain size. Grain size exponent, p, in the Dorn equation for creep is about 0.5 for the present alloy, which is fairly small compared with the value of 2 or 3 usually obtained for the superplastic alloys with fine grains. The total elongation of the specimen with a dual-phase microstructure is always larger than that of the specimen with an equiaxial single-phase microstructure at temperatures below the β transus. The jumping method gives a better correlation between the m-value and the total elongation than the constant method. The total elongation becomes large when the m-value is fairly high and remains constant at a wider strain range.
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