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Experimental reinvestigation of Al–Co phase diagram in vicinity of Al13Co4 family of phases.
- Source :
-
Journal of Alloys & Compounds . 10/25/2015, Vol. 647, p486-497. 12p. - Publication Year :
- 2015
-
Abstract
- The work is focused on the experimental reinvestigation of the Al–Co phase diagram in vicinity of the Al 13 Co 4 family of phases. For this purpose several alloys were prepared with bulk compositions ranging between Al 71 Co 29 and Al 77 Co 23 . Experimental samples processed of the as-cast alloys were annealed for 330 h at various temperatures between 1070 and 1150 °C and subsequently rapidly cooled to fix their high-temperature microstructures. The annealing temperatures were selected with respect to the earlier published Al–Co phase diagrams. In the investigation X-ray diffraction, differential scanning calorimetry, and scanning electron microscopy including both energy dispersive X-ray spectroscopy and electron backscatter diffraction were used. In the microstructures of as-annealed alloys various combinations of B2-AlCo, Al 5 Co 2 , Z-Al 3 Co, Y 1 -Al 13 Co 4 , Y 2 -Al 13 Co 4 , M-Al 13 Co 4 , O′-Al 13 Co 4 , and solidified liquid were identified. It was found out that the earlier published single-phase Y-area is comprised in fact of monoclinic Y 1 -Al 13 Co 4 and orthorhombic Y 2 -Al 13 Co 4 lamellas. From the thermodynamic point of view, Y 1 -Al 13 Co 4 and Y 2 -Al 13 Co 4 are stable and metastable phases, respectively. The O′-Al 13 Co 4 phase was identified at 1070 °C in the alloys where the occurrence of O-Al 13 Co 4 was expected. A modified partial Al–Co phase diagram was also proposed with respect to the experimental results obtained. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ALUMINUM
*COBALT
*ALLOYS
*METAL microstructure
*PHASE diagrams
*ANNEALING of metals
Subjects
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 647
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 109333128
- Full Text :
- https://doi.org/10.1016/j.jallcom.2015.05.248