Back to Search Start Over

Solidification characteristics of Al–9·6Mg alloy solidified under high pressure (4 GPa)

Authors :
H.W. Wang
L. Cao
Zunjie Wei
Z.-L. Wang
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...

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