Phase evolution during crystallization of nanocomposite alloys with Co:Fe ratios in the two-phase region of the binary Fe-Co phase diagram
- Materials Science and Engineering Department, Carnegie Mellon University, Pittsburgh, Pennsylvania, 15213 (United States)
A series of alloys was prepared to investigate the crystallization of Co-rich HiTPerm-type alloys [(Co{sub 1-x}Fe{sub x}){sub 88}Zr{sub 7}B{sub 4}Cu{sub 1}] with Fe:Co ratios within or near the two-phase (bcc+fcc) region of the binary phase diagram. The goal of this work is to better understand the phase evolution and crystallization of alloys in which the Fe-Co binary phase diagram predicts more than one transition metal rich primary crystalline phase to be present in equilibrium at the primary crystallization temperature. X-ray diffraction, transmission electron microscopy, and high-temperature vibrating-sample magnetometry have been performed to identify the first phase to crystallize and to follow the evolution of phases during crystallization. The bcc phase appears to be the primary crystalline phase that forms first after annealing at 450 degree sign C for 1 h, in agreement with previous work on Co-rich nanocomposite alloys. We observe that as the Co concentration is increased, the fcc crystalline phase forms at lower annealing temperatures and its volume fraction increases for a given annealing temperature.
- OSTI ID:
- 20982871
- Journal Information:
- Journal of Applied Physics, Vol. 101, Issue 9; Conference: 10. joint MMM/INTERMAG conference, Baltimore, MD (United States), 7-11 Jan 2007; Other Information: DOI: 10.1063/1.2711283; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ANNEALING
BCC LATTICES
BINARY ALLOY SYSTEMS
BORON ALLOYS
COBALT ALLOYS
COMPOSITE MATERIALS
COPPER ALLOYS
CRYSTALLIZATION
EVOLUTION
FCC LATTICES
FERROMAGNETIC MATERIALS
IRON ALLOYS
NANOSTRUCTURES
PHASE DIAGRAMS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0400-1000 K
TIME DEPENDENCE
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
ZIRCONIUM ALLOYS