Titanium

• Melts at 1670°C• Density 4.51 g cm-3

• 80% of Ti used in aerospace• Use restricted to < 400°C

body-centred cubic stable above 890 oC

hexagonal close-packed stable below 890 oC (c/a = 1.587)

titanium heat-exchangers

roll-bonded, explosion-clad, loose-lined

Alloying

• stabilisers•Mo, V, W

• stabilisers•Al, O

• stabilisers (eutectoid)•Cu, Mn, Fe, Ni, Co, H

fine hydrides near the surface of cold rolled titatnium.

Nippon Steel

needle-like hydrides in zirconium, quenched into iced-brine from 800°C

source unknown

alloys

alloys

Ti - 6Al - 2Sn - 4Zr - 2Mo

solution hardening

-stabiliser

alloys Ti - 6Al - 4V

aluminium reduces density

vanadium introduces

both solid solution strengthen

1100 MPa, creep resistant at 300°C

ductile-brittle transition

burn-resistant alloys

Ti - 35V - 15Cr

up to 510°C

quenching from