3. Composition, structure and microstructure

3.1 Most studied compositions and their microstructure

The single-phase AHEs most studied experimentally can be classified into two main families (table 1 ):

• those composed of transition metals forming a face-centered cubic (cfc) solid solution;

• those composed of refractory metals forming a cubic-centered (cc) solid solution.

Each of these families includes quaternary and quinary alloys, both equimolar and non-equimolar. The list in table 1 includes compositions that have been developed to a stable state and thoroughly characterized. This list is not...