Strength increase in Ti 35 Wt Pct Nb through step-aging
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The room temperature tensile properties of precipitation-hardened Ti−Nb alloys were correlated to the microstructure obtained by aging in the (α+β) phase field. Balanced strength properties with a flow stress of 100 ksi and an elongation to fracture of 4 pct were obtained by means of step aging. The distribution and size of the particles formed by step aging controlled the dislocation-particle interaction. The large α particles precipitated by first aging at 550°C imparted increased ductility while the smaller metastable particles precipitated by subsequent reaging at 400°C conferred a substantial increase in flow stress.
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