TITLE:
Formation of Diffusion Pairs as an Initial Stage in the Process of Decomposition of Alloys
AUTHORS:
Yuri Ustinovshikov
KEYWORDS:
Ordering-Phase Separation, Transition, Ionic Bond ↔ Covalent Bond, Pair Interaction, Diffusion Pairs, Transmission Electron Microscopy, Superalloys
JOURNAL NAME:
Advances in Materials Physics and Chemistry,
Vol.10 No.12,
December
29,
2020
ABSTRACT: The paper discusses the researches that formed the basis of the study of the transition of “ordering-phase separation” and the reasons for such transition occurrence. Experimental results have presented what diffusion pairs are and how they occur in binary and multicomponent alloys. The paper illustrates that the chemical bonds between atoms are realized on the principle of pair interaction in both solid and liquid states of the alloy. The process of separating a multi-component ABC alloy into diffusion pairs A/B, A/C, and B/C occurs in a liquid solution, where the diffusion mobility of atoms is very high, and the resistance of the environment is relatively low. The driving force of such a process is the chemical attraction between like and unlike atoms, that is, the tendency to phase separation and the tendency to ordering. Quenching the liquid alloy into the water fixes a microstructure consisting of microscopic areas corresponding in composition to one or another diffusion pairs. The paper shows what exactly should be done so that such a branch of science as Materials Science could get rid of the empirical approach when creating new alloys.