Al 7075 alloy 1

[tzole]

I want to produce Al 075 alloy. I woyld like to know if i can produce this alloy by melting the main elements in an electric furnace.Firstly, i melt Al 2024 master alloy and then add Al, Mg, Zn. All elements are added as pellets, except for Mg, which is in small pieces of wire. When i add the pieces of Mg, these remain on the top of the melt and a great amount of porous and oxides are produced. I would like to know if it would be better to add Mg in pieces of sheet, in order to enter into the melt.

 

[metengr]

tzole;
You might want to visit the web site below and search out the topic aluminmum liquid metal (go to the full table of contents)

http://www.eaa.net/education/TALAT/index.htm

 

[arunmrao]

You can discuss this with your nearest Foseco representative. I see that you need to provide a flux cover with a reducing atmosphere to improve your Mg recoveries. Adding Mg in wire.rod or plate form is not going to make a difference,but you ned to plunge it inside after the metal is suitably covered.

 

[TVP]

For the reasons that you have discovered (lower density than aluminum, rapid oxidation at the surface, etc.), magnesium is not added individually to molten aluminum, but instead is added as an Al-Mg master alloy, usually with 25% Mg or 50% Mg. I suggest you contact a supplier of Al-Mg master alloys such as KB Alloys, Milward Alloys, or Metallurg Aluminium.

 

[kenvlach]

It's not a very good idea to try producing your own Al 7075.
Although it's not that difficult to successfully alloy the lightweight, high vapor pressure Mg (Zn also has high v.p.) under a proper flux, with stirring, you need to clean off the flux/slag and cast quickly into pre-baked (avoid steam explosiona!) molds.

The biggest problem is that the cast solidification structure must be rolled to break up the primary solidification intermetallics (hot roll), followed by a solutionizing heat treatment & quench to homogenize the alloy. Necessary for a wrought microstructure.