The effect of heat treatments on the microstructure and properties of FeAl+Cr
- Univ. of NSW, Sydney (Australia). School of Materials Science and Engineering
Microstructural studies were performed on an alloy of composition Fe{sub 45}Cr{sub 5}Al{sub 50} heat treated at 950 C and oil-quenched and then given isothermal annealing treatments for times up to 200 hours at either 400 C or 500 C. The observed microstructures were correlated with variations in hardness during isothermal annealing. It was deduced that the thermal vacancies retained following the initial heat treatment are removed relatively rapidly from the lattice, which leads to an initial drop in hardness. However, during prolonged annealing, the coarsening of both FeAl{sub 2} particles and a disordered {alpha}(Fe,Cr) phase leads to further softening. It was also deduced that the chromium atoms, which remain in solution, are effective solute strengtheners. The {alpha}(Fe,Cr) phase, which is coherent with the B2 matrix, appears to coarsen by a ledge growth mechanism.
- OSTI ID:
- 571779
- Report Number(s):
- CONF-961202-; TRN: IM9806%%86
- Resource Relation:
- Conference: 1996 Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 2-6 Dec 1996; Other Information: PBD: 1997; Related Information: Is Part Of High-temperature ordered intermetallic alloys VII; Koch, C.C. [ed.] [North Carolina State Univ., Raleigh, NC (United States)]; Liu, C.T. [ed.] [Oak Ridge National Lab., TN (United States)]; Stoloff, N.S. [ed.] [Rensselaer Polytechnic Inst., Troy, NY (United States)]; Wanner, A. [ed.] [Univ. Stuttgart (Germany)]; PB: 799 p.; Materials Research Society symposium proceedings, Volume 460
- Country of Publication:
- United States
- Language:
- English
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