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Effect of La2O3 addition on the microstructure of partially remelted Mg-9Al-1Zn alloy.
- Source :
-
Journal of Materials Science . Dec2005, Vol. 40 Issue 24, p6429-6432. 4p. 1 Diagram, 1 Chart. - Publication Year :
- 2005
-
Abstract
- The effect of La2O3 addition on the microstructure of partially remelted Mg-9Al-1Zn (AZ91D) alloy was studied. The results indicate that small amounts of La2O3 additions to AZ91D alloy refined the partially remelted microstructure and caused the formation of new phase- LaAl4 in the microstructure. Moreover, the grain size of the partially remelted alloys is decreased with the increasing of La2O3 addition. In as-cast microstructure the LaAl4 phases have two morphologies: needle-like and particle-shape. The presence of more LaAl4 phases, especially, the particle-shape LaAl4 which dispersedly distributed within the grains can induce more dislocations, which can result in the occurring of a large amount of recrystallizations. Moreover, these LaAl4 phases can also restrain the growth and combination of the recrystallizations and partially remelted initial grains during the subsequent heat-treatment. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00222461
- Volume :
- 40
- Issue :
- 24
- Database :
- Academic Search Index
- Journal :
- Journal of Materials Science
- Publication Type :
- Academic Journal
- Accession number :
- 19420020
- Full Text :
- https://doi.org/10.1007/s10853-005-1628-1