Structure and properties of a series of binary Ti-Mo alloys with molybdenum
contents ranging from 6 to 20 wt% have been investigated. Experimental res
ults indicated that crystal structure and morphology of the cast alloys wer
e sensitive to their molybdenum contents. The hexagonal alpha' phase c.p. T
i exhibited a feather-like morphology. When Mo content was 6 wt%, a fine, a
cicular martensitic structure of orthorhombic alpha" phase was observed. Wh
en Mo content was 7.5 wt%, the entire alloy was dominated by the martensiti
c alpha" structure. When Mo content was increased to 10 wt% or higher, the
retained beta phase became the only dominant phase. Among all Ti-Mo alloys,
the alpha" phase Ti-7.5Mo alloy had the lowest hardness. The bending stren
gth of Ti-7.5Mo was similar to that of Ti-15Mo and Ti-13Nb-13Zr, and higher
than c.p. Ti by nearly 60%. The bending modulus of the alpha"-dominated Ti
-7.5Mo alloy was lower than that of Ti-15Mo by 22%, of Ti-6Al-4V by 47%, of
Ti-13Nb-13Zr by 17%, and of c.p. Ti by 40%. (C) 1999 Elsevier Science Ltd.
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