The ternary equilibrium diagram of the Cu-Sb-Ni system has not heref ore been investigated. Regarding the diagrams of the binary systems Cu-Sb1' and Ni-Sb2' composing this ternary system, the writer studied them very carefully under the direction of Professor T. Murakami and completely revised the old diagrams, and the correctness of these proposed diagrams have been verified by X-ray analysis by Dr. Osawa in collaboration with the writer. The present report deals with the heterogeneous

more »

... ia pertaining to liquid, which have been studied by thermal, electric resistance and microscopic methods in addition to some X-ray analyses. In the thermal analysis some two hundred specimens made of electrolytic copper, electrolytic nickel and distilled antimony were used, and from the result of these analyses fields of primary crystallization surfaces have been established from the isothermal lines thereby obtained as well as by microscopic examination. Further, from the combined results of the thermal analysis and microscopic examination 18 sectional diagrams and 4 isothermal diagrams (1100°,1000°, 800°, 500°) were constructed, and the nature of various reactions were clarified. In order to ascertain the two peritecto-eutectic temperatures, measurements of electric resistance have been also carried out. The method of measurement was the same as that used by the writer" previously. In the heating of alloys, in this experiment, liquid appeared and volatilization of Sb was very noticeable, and hence reversible curves were not obtained when these alloys were cooled, but the temperatures of the peritecto-eutectic reactions and ternary eutectic reaction were easily noted, and they were assigned, taking the thermal data into consideration, as 584° and 620° for the former and 521° for the latter. In microscopic examination alloys of composition on lines connecting r~ and rn and also r~ and phases in the ternary triangle, in addition to those used in the foregoing experiments, were used as specimens after they were subjected to various heat-treatments. As etching reagents those used in the previous investigations" 2) of binary system were found satisfactory. The phases identified by microscopic 1) T.