RuAl and its alloys. Part I. Structure, physical properties, microstructure and processing

The structure, physical properties, processing and the related microstructure of RuAl and its alloys are presented in Part I of this overview, with a particular emphasis on the recent studies. The structure and physical properties reviewed include electronic structure, bonding, crystal structure, phase stability, as well as thermodynamic, elastic, electrical and thermal properties. Crystal defects are also covered and special attention is given to constitutional point defects, dislocations and planar faults. Ingot and powder metallurgy, mechanical alloying and thin film deposition are considered as processing techniques for the production of single or multiphase RuAl alloys. The typical characteristics of the microstructure related to different processing methods are presented. The entire overview is completed in Part II where mechanical properties, deformation and fracture behavior, environmental resistance and applications are discussed.