Conclusions 
fa: 
. . ... . . . fee ab 
- The beta phase that is retained by addition of significant amount of Nb improves ductility (by 
providing a soft ductile phase) A 
- Increasing Nb and Al content enhanced the majority of the material performances 0 
- The best strength properties (superior to B21 alloy) are obtained with Ti-15Mo-5Nb-5A1-0,5 Si 
alloy 
- A fine nedle - like microstructure (Fig. 3) exhibits tensile strength better ductility than ts 
microstructures with a coarse Widmanstétten aspect (Fig. 4) 
- Heat-treatment recomanded is quenching 845°C/1hWQ and ageing (540°C/8h) Ausie 
References i” 
(1) T. BANIA — IS1J International 8 (1991) 840 - 847 m 
(2) F. H. Froes — 1.S1J International 10 (1991) 1235 - 1248 ” m 
(3) Y. KAWABE. S. MUNEKI 8 (1991) 785 - 791 Le 
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