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Solidification characteristics of Al–9·6Mg alloy solidified under high pressure (4 GPa)
- Source :
- International Journal of Cast Metals Research. 19:349-355
- Publication Year :
- 2006
- Publisher :
- Maney Publishing, 2006.
-
Abstract
- The present paper studies influences of high pressure up to 4 GPa at 1273 K on the microstructures and the phases of Al–9·6Mg alloy by means of optical microscopy (OM), X-ray diffraction (XRD), energy dispersive X-ray microanalysis (EDX), differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). The results showed that fine dendrite with long primary arm formed at 4 GPa in comparison with the coarse discontinuous dendrite under normal pressure. Specially, a new high pressure metastable phase, Al(63·7)Mg(36·3), was produced besides a small amount of β-Al3Mg2 phases at 4 GPa, which was not found in other solidification conditions. Al(63·7)Mg(36·3) phase has bcc structure with the lattice constant a=8·495 A. Evolution mechanism of microstructures and phases was studied in the present paper. Furthermore, Mg concentration in α-Al phase has increased by 42%. Correspondingly, the lattice constant of α-Al phase has increased by 0·44%. The nanohardness of α-Al phase in the alloy i...
- Subjects :
- Materials science
Mechanical Engineering
Alloy
Metals and Alloys
Analytical chemistry
engineering.material
Microstructure
law.invention
Crystallography
Dendrite (crystal)
Differential scanning calorimetry
Lattice constant
Optical microscope
Mechanics of Materials
law
Transmission electron microscopy
Phase (matter)
engineering
Subjects
Details
- ISSN :
- 17431336 and 13640461
- Volume :
- 19
- Database :
- OpenAIRE
- Journal :
- International Journal of Cast Metals Research
- Accession number :
- edsair.doi...........c7e48b0929283a82d37d986373ff4b85
- Full Text :
- https://doi.org/10.1179/136404606x157809