Accession Number : AD0437579


Title :   TRANSFORMATIONS IN IRON RUTHENIUM ALLOYS UNDER HIGH PRESSURE,


Corporate Author : MANLABS INC CAMBRIDGE MASS


Personal Author(s) : Blackburn,L D ; Kaufman,Larry ; Cohen,Morris


Report Date : Apr 1964


Pagination or Media Count : 39


Abstract : At atmospheric pressure, iron-ruthenium alloys containing less than 12 at.-% ruthenium exhibit a diffusionless alpha (b.c.c.)=gamma (f.c.c.) transformation on heating and cooling, while alloys containing 12-36 at.-% ruthenium exhibit a diffusionless epsilon (h.c.p.)=gamma (f.c.c.) transformation. High pressure displaces the alpha=gamma reaction to lower temperatures, but shifts the epsilon=gamma reaction to higher temperatures. These effects appear to be governed by the pressure dependence of the thermodynamic properties. The application of pressure also produces a new transformation, alpha = epsilon, at room temperature in alloys which contain the alpha-phase at atmospheric pressure. Pressure-temperature diagrams at constant composition thus contain triple points involving b.c.c. alpha, f.c.c. gamma and h.c.p. epsilon. As the ruthenium content is increased, the triple-point pressure decreases continuously. (Author)


Descriptors :   *IRON ALLOYS , PHASE STUDIES , PHASE STUDIES , TRANSFORMATIONS , HIGH PRESSURE , TRANSITION TEMPERATURE , TEMPERATURE , ELECTRICAL RESISTANCE , PRESSURE , X RAY DIFFRACTION , CRYSTAL STRUCTURE


Distribution Statement : APPROVED FOR PUBLIC RELEASE