Abstract
In this paper, a near-α dual-phase Ti-6.4Al-4.4Mo-2.1Zr-0.6Si alloy, modified from TC11 alloy, and prepared by copper-mold suction casting, achieves the high strength level, with the ultimate tensile strength of 1323 MPa, yield strength of 1222 MPa, and specific strength of 289 kN m/kg, even superior to the reference TC11 prepared in the same condition and comparable to high-strength β-Ti alloys, at the expense of a low as-cast elongation of 1.2%. Its composition formula α-{[Al-Ti12](AlTi2)}14 + β-{[Al-Ti13Zr1](Mo2Si1)}3 fall within the composition framework previously determined for TC11: the α and β formulas still satisfy the ratio of 14: 3, while the β part, originally [Al-Ti13.2Zr0.8](Mo1.5Si0.5Ti1) for TC11, is further enhanced using Zr, Mo and Si co-alloying. This alloy is characterized by a basket-weave microstructure containing extensive fine α′ martensite needles plus small amounts of α and remnant β phases and very few α'' phases.
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