Abstract: Heat treatable titanium alloys of the Ti.sub.3 Al type comprise 20 to 23 Al - 9 to 15 Nb-0.5 to 1.0 Si balance essentially T; (at %). These alloys exhibit a good balance of properties at room temperature and at high temperature (600.degree. C. plus) especially when solution treated in the .beta. field and artifically aged. Zr, V and Mo can be included in the alloys.

Abstract: Articles of titanium based materials are protected against alpha case formation such as results from exposure to air at high temperatures coating with a nickel-chromium based alloy. The coating may be deposited by ion plating, sputter plating or sputter ion plating these methods being preferred for avoidance of surface contamination. A preferred nickel to chromium ratio (by weight) is 18:1 to 1.5:1. Specific coating compositions are: a) Nimonic 75 (trade name) a 20 percent chromium 80 percent nickel (by weight) based alloy; and b) Ni-35Cr-8Al-8Si (by weight).

Abstract: A rapid solidifcation rate (RSR) route aluminum alloy contains lithium and a dispersoid forming ingredient selected from niobium, molybdenum, hafnium, tantalum, and tungsten. These dispersoid forming ingredients resist coarsening in the matrix at solution treatment and ageing temperatures. The dispersoid forming ingredient is preferably present in 0.2 to 5.0 percent by weight.

Abstract: An alloy formed by rapid solidification comprising Al, 1 to 7 wt % Cr and up to 6 wt % X where X is selected from refractory metals Nb, Mo, Hf, Ta, and W, has improved thermal stability.