Development of new alloys has been slowed by the empirical method of trials and errors that absorbs more and more resources and leads to ever smaller results. Solution of this problem is possible through the use of the general principles of the alloys design theory. In this paper, we have proposed to consider cast metal matrix composites as foundry alloys and have developed a methodological approach to selection of alloying and reinforcing components considering the operational conditions for parts of friction units. Application of the proposed approach allows to make reasonable choice of composite alloys components within conditions of various schemes of reinforcing, including exogenously reinforced, endogenously reinforced and complex reinforced alloys.
Author: Kechin V. A.
Sacrificial materials are widely used to protect metal structures from electrochemical corrosion. As a base of sacrificial alloys are used aluminum, zinc and magnesium. The article presents the main sacrificial, corrosion and casting properties of binary (Al-Zn, Zn-Mg, Mg-Al) and ternary alloys of Al-Zn-Mg system. The results allow reasonably choose alloy compositions with best electrochemical properties with regard to the operation conditions of cast protectors.
The characteristic of the elements present in the primary aluminum at electrolytic method of production is given. Based on elemental analysis of aluminum on regulated and unregulated impurities, with accordance of their initial content and effect on operational characteristics of cast billets, in this paper we describe groups of useful elements, neutral and harmful impurities at production of materials for functional purposes (sacrificial, composite, electrotechnical, etc.).