A. Crystal Lattices in Powder Metallurgy Products Fabrication of metal powders can be achieved by several mechanical, chemical, or electrochemical methods. According to the method of fabrication, the powder particles differ in shape, size and structure. Any powder particle is characterized by the high ratio of its surface area to its mass or volume. This is an important feature with respect to the particle structure, inasmuch as the surface crystal lattices are usually different from the body lattices ; they show a large amount Powder Metallurgy in Nuclear Engineering 3 above sintering conditions, following the actual sintering operation. C. Alloys by Powder Metallurgy It is well known among nuclear engineers that certain alloys made from fissionable materials with small alloying additions are more favorable with respect to radiation effect and corrosion than the pure fissionable material, although the mechanisms causing these effects are not yet fully understood. Alloys can be prepared by conventional melting processes in liquid state reactions, or they can be made by powder metallurgy in solid state reactions. The end product may differ in grain size ; however, this may not have any extensive effect on the corrosion resistance of the alloy. The preparation of certain alloys by powder metallurgy offers some advantages, especially in alloys made from very heavy metals such as uranium, and very light metals. Ordinary melting of two components with quite a difference in density frequently results in segregation
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