aluminium-titanium alloys

[bon10]

does any one know what is the atomic bond between titanium and aluminum in there alloys? and
why the titanium atom decrease the aluminium grains? . thanks alot

 

[CoryPad]

The bonding between aluminium and titanium in their alloys is a delocalized metallic bond.

For a description of aluminium grain refinement, look here:

http://www.wpi.edu/Academics/Research/ACRC/Research/novel.html

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[metengr]

To add;
Here is a technical paper titled "Grain Refining of Aluminum Foundry Alloys"

http://www.diecasting.asn.au/papers/1989C2.pdf

 

[etch]

ok basically the titanuim is usally combined with boron, but not always. the titanium acts as seeding effect, on cooling the titanuim having a higher metling point colls down and acts as neucleating zones, the more titanium the greater the zones. These help promote smaller grains as they solidify,

Care has to be taken when using titanium in furnaces, as it has a tendancy to drop out of solution and sink to the bottom of the pot, a good mix with a dry stirrer should help avoid this.