Metallurgy solid solution composition

ODS materials are produced by powder metallurgy and the first step of the process consists in cogrinding a metal powder with a yttrium oxide powder. The metal powder is composed either of a prealloyed powder with the same chemical composition as the material wanted except for yttrium and oxygen, or of several metal powders with various chemical compositions which, during grinding, will form a powder with a homogeneous distribution of all elements. This step, known as mechanical alloying, produces a powder that can be described in a first approximation as a solid solution. 

A solution (whether solid, liquid, or gaseous) may be defined as a homogeneous phase composed of different chemical substances, whose concentration may be varied without the precipitation of a new phase. The composition of the solution may be expressed in a number of ways. In metallurgy, it is usually expressed either as weight percent or atom percent. ... 

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