Tantalum alloys containing up to about 50. percent titanium retain much of the superlative corrosion resistance of tantalum. For some environments, columbium may be substituted for a portion of the tantalum. Under more severe conditions, titanium content below 30 percent appears advisable, from the standpoint of both corrosion resistance and hydrogen embrittlement. Contacting or alloying the tantalum-titanium materials with noble metals greatly decreases the latter type of attack.
Tantalum-titanium alloys cost less than tantalum because titanium is cheaper than tantalum and because the alloys are appreciably lower in density. These alloys are amenable to hot and cold work, and appear to have sufficient ductility to allow fabrication. In general, maximum ductility is obtained after heat treatment at 900 to 1000 C. 6.3.13, 6.3.15, 3.7.2
