Abstract
The equilibrium diagram of the magnesium-copper system has been examined by means of thermal and microscopic analyses. The results of the present experiments are summarized as follows:-
(1) In this system there exist two compounds, i.e., Cu2Mg(β) and Mg2Cu, which melt at 785° and 567° respectively. By the microscopic examination, the authors has revealed that the compound Cu2Mg has a solubility range (83.04%_??_82.44% of copper), which Was previously suspected.
(2) There exist three eutectic points as follows:-
(1) The eutectic between the compound Cu2Mg(β) andd the copper solid solution, occurss at 720° and 91.6% of copper.
(2) The eutectic between the compounds Cu2Mg(β) and Mg2.Cu occurs at 550° and 65% of copper.
(3) The eutectic between the compound Mg2Cu and magnesium side occurs at 488° and 30.8% of copper.
(3) The solubility curve reveals that the solid solubility, of magnesium in copper decreases from about 3.0% at 720° to about 1.5% at 200°
