Abstract
Ti-16Nb-xMn (x = 0, 1, 3, 5, 7, and 9 at.%) alloys were prepared by cold crucible levitation melting, and their tensile properties were studied at ambient temperature. The Ti-16Nb-7Mn alloy exhibited a high tensile strength of 695 MPa, large plastic strain of 43%, and low elastic modulus of 77 GPa. Transmission electron microscopy studies revealed that orthorhombic α″ and body-centered cubic β phases present in the Ti-16Nb alloy were modified by the addition of Mn to form a single β phase structure. The improvement in the mechanical properties with the addition of Mn is attributed to three factors: (1) the change of phase constitutions from α″+β to β+ω, then to β, (2) solid solution strengthening, and (3) increased stability of the β phase. The Ti-16Nb-7Mn alloy displayed high strength, high ductility, and low elastic modulus, making it a promising candidate for biomedical applications.
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