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 o C

hexagonal close-packed stable below 890 o C (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

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