Paper PII-28

STUDIES ON MULTICOMPONENT ARSENIC SYSTEMS

Romanowska Jolanta, Wnuk Grzegorz

Rzeszow University of Technology, ul. W. Pola 2, 35-310 Rzeszów, Poland

Thermodynamic description of arsenic binary systems is very scarce and for ternary ones almost does not exist. It is due to the arsenic properties, especially its high pressure, which makes it difficult find a suitable method to carry on experiments.In the binary systems As-Zr (Ti, La, Ce) there is a strong tendency to forming intermetallic compounds. In this paper, it has been investigated wheather such a tendency, represented by the value of interaction parameters, occures in ternary systems Cu-As-Zr (Ti, La, Ce) and the results of these have been correlated with thermodynamic properties of liqiud alloys.

The arsenic activities in diluted ternary systems Cu-As-Zr (Ti, La, Ce) have been determined by the means of the equilibrium vapour saturation method at the temperatyre 1723K. As this method is a comparative one, the Cu-As alloy has been used as a reference mixture. Although the arsenic pressure is very high, the arsenic activity coefficient in Cu-As γ is low ( about 10^-3), so the arsenic pressure over Cu-As alloy is not too high for carrying on experiments. The Redlich –Kister equation has been used for describing Cu-As alloy.

The microstructure of solid alloys has been investigated, paying special interest to content
and distribution of intermetallic compounds in cooper.

This work has been sponsored by Polish State Committee for Scientific Research – grant No 4 TO8B 017 25