P–T–x Phase Diagram of Al–Ba System

A two component Al–Ba system has been studied in which intermetallic compounds are formed that are stable at temperatures above the melting points of both barium and aluminum. This allows us to consider barium as a promising alloying element for aluminum alloys operating at high temperatures, which is also characterized by relatively high vapor pressure. Widespread use of aluminum–barium alloy in various fields of metallurgy for the preparation of alloys and complex modification of steels and cast irons, where aluminum improves the quality of steels, acting as a reducing agent for iron in its oxide compounds, and barium promotes the graphitization of cast irons, leads to improved structures of pearlitic and ferritic compounds. Taking into account the high vapor pressure of Ba in the aluminum–barium system is necessary when analyzing compositions in pressure–temperature–composition coordinates ( p – T – x state diagrams), which can be used in the development of ternary or higher alloys containing aluminum and barium.