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Casting Titanium Aluminum Mix
- Thread starter TheRedSea
- Start date
- Replies 9
- Views 2,029
johnoder
Diamond
- Joined
- Jul 16, 2004
- Location
- Houston, TX USA
Degassing says a few Google hits, though makes no mention of percentage
https://www.google.com/search?as_q=..._occt=any&safe=images&as_filetype=&as_rights=
The real Leigh
Diamond
- Joined
- Nov 23, 2005
- Location
- Maryland
Hi, Red Sea, and welcome.
I moved this to the General section where it will get more visibility.
- Leigh
I moved this to the General section where it will get more visibility.
- Leigh
Robert R
Hot Rolled
- Joined
- Aug 27, 2005
- Location
- Raymond , CA
Titanium aluminum alloys
Titanium is added to aluminum casting alloys to refine the grain structure and prevent hot cracking when the casting cools. The upper limit appears to be 0.5 % according to volume 2 Ninth edition of the Metals Handbook.
Aluminum alloys with 25 % or more titanium and similar amounts of Niobium are referred to as titanium aluminides or as intermetallic compounds. They are used in high temperature applications such as gas turbines. I could not find the details of how small amounts of titanium are added to a aluminum melt. It suspect it may be added as titanium dioxide.
Robert
Titanium is added to aluminum casting alloys to refine the grain structure and prevent hot cracking when the casting cools. The upper limit appears to be 0.5 % according to volume 2 Ninth edition of the Metals Handbook.
Aluminum alloys with 25 % or more titanium and similar amounts of Niobium are referred to as titanium aluminides or as intermetallic compounds. They are used in high temperature applications such as gas turbines. I could not find the details of how small amounts of titanium are added to a aluminum melt. It suspect it may be added as titanium dioxide.
Robert
Winterfalke
Stainless
- Joined
- Mar 26, 2011
- Location
- Huron
When I (briefly) worked for Alcoa I spent time maintaning a line making weldments from castings and extrusions. The castings, after being degreased and rinsed, went through a wash to get a thin coating of titanium. It prevented the clean aluminum from oxidizing in the atmosphere, and mixed well enough with the weld that it was not worth removing. So I suspect it might blend quite readily.
jscpm
Titanium
- Joined
- May 4, 2010
- Location
- Cambridge, MA
Sounds pretty exotic. I would expect that if such a thing is standard then aluminum foundry suppliers would carry pellets with alloyed titanium in them. So, the pellets are rich in titanium and you mix them with the melt in the proper porportion.
Even by using such pellets, you will still need to disperse and homogenize the titanium. I am not sure how foundry guys do that.
I know that zinc is often used in aluminum castings to make it more fluid. There is some real art to it, so you may want to talk to a specialist. Whenever I have seen homemade aluminum castings they always look like shit, so I would not underestimate the challenges here.
Even by using such pellets, you will still need to disperse and homogenize the titanium. I am not sure how foundry guys do that.
I know that zinc is often used in aluminum castings to make it more fluid. There is some real art to it, so you may want to talk to a specialist. Whenever I have seen homemade aluminum castings they always look like shit, so I would not underestimate the challenges here.
rcoope
Stainless
- Joined
- Sep 25, 2010
- Location
- Vancouver Canada
I would be interested to hear if anyone's aware of good small-scale casting resources. I've been thinking about backyard casting with friends and my YouTube watching son, but we're aware it's not trivial to do more difficult parts. Youtube is obviously a terrible mix of the useful and the flat wrong so will only help if you get lucky with the right channel. I sort of feel this must be a subject where for amateurs, you want to know how the pros did it 75 years ago. I'd be curious how much you want to invest in say temperature control vs. getting the right alloy mix for easy casting.
About 5% Titanium. This was news to me too and I have to say, when you google something and don't get any obvious hits, it really looks like no one is doing it. Can you describe more about the application?
About 5% Titanium. This was news to me too and I have to say, when you google something and don't get any obvious hits, it really looks like no one is doing it. Can you describe more about the application?
jscpm
Titanium
- Joined
- May 4, 2010
- Location
- Cambridge, MA
Yes, my mistake, I had heard somewhere that if you re-melt cast aluminum it is bad because the zinc leaves as a vapor every time you melt, so you have to add more zinc each time you re-melt, but maybe that was all just nonsense.
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