6061 alum or 7075 alum
6061 alum or 7075 alum
(OP)
I currently use 6061 for machining my parts, what would be the advantage of using 7075? How much more money are we talking about?
I also anodize my parts afterwards, will i get a different color anosizing if i go with 7075 ?
I also anodize my parts afterwards, will i get a different color anosizing if i go with 7075 ?





RE: 6061 alum or 7075 alum
RE: 6061 alum or 7075 alum
What types of parts are these?
Are parts failing?
Material changes kind of follow the "If it aint broke, dont fix it." rule. 7075 is generally a stronger alloy than 6061.
A quick review of the ASM metals reference book gives:
CODE
General Corrosion: 6061>7075
SCC: 6061>7075
Cold Workability: 6061>7075
Machinability: 6061<7075
General Weldability:6060>7075
The above is a pretty general guide though.
RE: 6061 alum or 7075 alum
so how muich stronger is 7075 than 6061?
RE: 6061 alum or 7075 alum
7075-T6 is generaly used for compression type load paths and 2024-T6 for tension loads. This is because 7075 is superior for compression and 2024 has good crack growth properties. I'm being very general here.
Be aware though because 7075-T6 is prone to stress corrosion cracking. You have to understand your cracks. Why are they forming? Is it due to a high stress level under operating condition (fatigue)? Or due to ssc, or is the part welded? If you describe your part more on this forum the material experts here can point you in the correct direction. Where is the crack? Is it in a weld? Located at a fastener hole? etc.
RE: 6061 alum or 7075 alum
http://www.breaksk8.com/engtips/part1.jpg
http://www.breaksk8.com/engtips/part2.jpg
http://www.breaksk8.com/engtips/part3.jpg
5 inches in length, 1 inch high and 1 inch depth
Lets say that there is pressure being put on it lengthways, would it be better to have 7075 or 6061 or another type of alum?
RE: 6061 alum or 7075 alum
Where do the cracks appear?
Mike Halloran
Pembroke Pines, FL, USA
RE: 6061 alum or 7075 alum
RE: 6061 alum or 7075 alum
RE: 6061 alum or 7075 alum
You have to try to determine if the crack is from SCC or is it a fatigue crack. This will help you choose the proper material. If it is SCC be aware that 7075-T6 might make the situation worse.
RE: 6061 alum or 7075 alum
RE: 6061 alum or 7075 alum
RE: 6061 alum or 7075 alum
RE: 6061 alum or 7075 alum
RE: 6061 alum or 7075 alum
http://www.metalimprovement.com