The ternary systems: Cr sbnd Al sbnd C, V sbnd Al sbnd C, and Ti sbnd Al sbnd C and the behavior of H-phases ( M 2AlC )
Abstract
Phase relationships in the ternary systems Cr sbnd Al sbnd C, V sbnd Al sbnd C, and Ti sbnd Al sbnd C have been investigated. All previously reported ternary H-phase Me 2AlC(Me =Cr, V, Ti) and the perovskite phase Ti 3AlC are confirmed. No new ternary phase was found. At 1000°C Ti 2AlC and Ti 3AlC are coexistent. In addition, the H-phase was found in equilibrium with TiC 1- x, TiAl 3, and TiAl; the perovskite with TiC 1- x, Ti 3Al, and Ti (solid solution with Al). TiC 1- x coexists with Al(l) at temperatures above 800°C. V 2AlC coexists at 1000°C with Al 4C 3, Al(1), Al 3V, V 7Al 8, V (solid solution with Al), V 2C, ζ-VC 1- x, and VC 1- x (including V 8C 7). At 1000°C Cr 2AlC is in equilibrium with Al 4C 3, γ-Cr 5Al 8, Cr (solid solution with Al), Cr 7C 3, and Cr 3C 2. At 800°C Cr 2AlC coexists also with graphite and β-Cr 2Al. V 2AlC forms a complete series of solid solutions with Cr 2AlC and Ti 2AlC. At about 1000°C the solid solution series Ti 2AlC sbnd Cr 2AlC exhibits a miscibility gap.
- Publication:
-
Journal of Solid State Chemistry France
- Pub Date:
- April 1980
- DOI:
- 10.1016/0022-4596(80)90569-1
- Bibcode:
- 1980JSSCh..32..213S