材料期刊网

The Pr-Co binary system has been systematically investigated by DTA, optical microscopy, X-ray diffraction and electron probe micro analysis (EPMA) techniques. A revised Pr-Co binary phase diagram is proposed. This binary system consists of six peritectic reactions, two congruently melting reactions and three eutectic reactions. The six peritectic reactions result in the formation of Pr4Co3, PrCo2, PrCo3, Pr2Co7, Pr5Co19 and PrCo5, respectively. The two congruent reactions involve the formation of Pr3Co and Pr2Co17. The three eutectic reactions occur at 570-degrees-C, 533-degrees-C and 1296-degrees-C. The solid solubility of Pr in cobalt is extremely small being about 0.03 at. % at 1000-degrees-C.