Vapor Deposition

Production of alloys directly from the vapor phase allows even greater flexibility in constitutional and microstructural development than RS and MA. Either monolithic material or alternate layers of two or more metals can be produced (Ref 21, 22).

Aluminum. The strength of a vapor deposited Al-7.5Cr-1.5Fe alloy is significantly higher than the strength of RS alloys up to at least 250 °C, a result of the fine microstructure produced by the vapor deposition technique. It is also possible to produce nanostructured layered structures that exhibit novel strength and modulus combinations (Ref 21, 22).

Titanium. The electron beam vapor quenching technique has been used to produce alloys that are not possible by I/M or even RS. One example is the production of titanium-magnesium alloys. Magnesium boils below the melting point of titanium making production of a liquid alloy impossible by conventional methods. Using the electron beam vapor quenching technique up to 28 wt% Mg can be alloyed with titanium. This is a potentially attractive alloy because magnesium lowers the density of titanium in excess of 1% for each 1 wt% Mg added.

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