the roll of iron(fe) in die casting aluminum alloys
TRANSCRIPT
The roll of Iron(Fe) in
Die Casting Aluminum Alloys
Ali Molavi
Spring 2015
Some Die Casting parts
What is Die Casting method?
A kind of Die Casting Machine:
Die Casting Aluminum Alloys:
Graphite Crucible
Aluminum
Fe
MgCu
Si
Sr
Why Fe (Iron) ?
more Fe ≈ more life time of Dies
How much Fe we could add to Aluminum Alloys?
Intermetallic compound
specification
Brittle
sharp
grow in the grain
boundaries
Microstructure
How does the properties of Aluminum Alloy change with adding Fe?
Elongation
Toughness
Strength
Hardness
What is the solution ?
Cr and Mn
Change the composition of the Fe-rich intermetallic phases
The results of adding Cr and Mn are:
Change the grow mechanism of the Fe-rich intermetallic phases
Change the shape and place of the Fe-rich intermetallic phases
Schematic of the microstructure of Aluminum with Fe-rich intermetallic phases (a) without and (b) with Cr and Mn.
(a) (b)
Conclusion:
1) It is needed to have Fe in Aluminum Alloys for Die Casting to make the Die's life
longer.
2) Fe-rich intermetallic Phases will appear in the microstructure of Alloy by adding
Fe.
3) Fe-rich intermetallic phases are harmful for mechanical properties of material,
because they are brittle, sharp-edged and located in grain boundaries.
4) By adding Cr and Mn to Aluminum Alloy the Fe-rich intermetallic will be less
sharp-edged and they will move from grain boundaries into the grains.
5) As a result of adding Cr and Mn to Aluminum Alloy mechanical properties of
material will be maintained.
Any Question?
Thank you