[DrasticSports]

Does anyone know the strength and weight differences between titanium and aluminum (6061 & 7075)?

Thanks

[Ken_Shea]

Aluminum .09750 lb/ci

Titanium .16300 lb/ci

Another asset of MEpro



Tensile Yield Strength
6061-T6 45,000 PSI
7075-T6 67,000 PSI

Titanium (general) 110,000 PSI

[DrasticSports]

Wow that is a major difference. Almost half the weight and twice the strength.

What supplier has the best price?

Thanks

[dertsap]

now lets talk price difference

[Geof]

Wow that is a major difference. Almost half the weight and twice the strength.......

No, not quite that good, you read Ken's numbers backwards; Titanium is 1.67 times the weight of aluminum, 1.64 times the strength of 7075 and 2.44 times the strength of 6061.

[Zumba]

now lets talk price difference

Price is negligible for Lockheed Skunkworks people.

[posix]

which basically means if 7075 is cheaper stick to aluminium (unless medical application of course)!

[posix]

no it doesn't, I forgot about the poor "cycling" strength of aluminium. if your part will have frequent back-forth forces applied to it (think piston rod, up down up down) then you don't want aluminium, it will fatigue rather quickly (which is exactly the reason why performance rods are always steel or titanium)

[lakeside]

Also they use magnesium

[lakeside]

Price is negligible for Lockheed Skunkworks people.

in other words you'll just grab it like anyone in the trade

[DrasticSports]

I don't suppose you have the stats for Carbon Fiber as well?

Thanks

Aluminum .09750 lb/ci

Titanium .16300 lb/ci

Another asset of MEpro



Tensile Yield Strength
6061-T6 45,000 PSI
7075-T6 67,000 PSI

Titanium (general) 110,000 PSI

[Ken_Shea]

With Carbon Fiber you will need to know what kind, as it ranges from 80psi to hundreds of thousands PSI,

Here is a useful link where I find my materials specs.

http://www.matweb.com/index.asp?ckck=1

[Geof]

Thank you for the link Ken; it has assuaged my hurt feelings.

[Ken_Shea]

My pleasure Geof, but you don't need to use vulgar language

[DrasticSports]

It seems there is a huge range in Carbon Fiber strength. I saw this link and if I am reading it right, it says the tensile strength is 421,000 which is way stronger then titanium.

(I am not a machinist, but I do put work requests out on this forum so I need to know more about what I am asking for)

I greatly appreciate your help.

With Carbon Fiber you will need to know what kind, as it ranges from 80psi to hundreds of thousands PSI,

Here is a useful link where I find my materials specs.

http://www.matweb.com/index.asp?ckck=1

[Ken_Shea]

Yes and Yes

It is bad to the bone strong stuff, I guess it machines easily enough but have read where it is very dirty and tough on cutters. Have never machined any personally. I too would be interested in others experience in machining it, where it can be purchased and the cost.

[Geof]

Here is a link for some information on carbon fiber composites.
http://en.wikipedia.org/wiki/Graphit...forced_plastic

[Neil Lindsay]

Aluminum in the proper alloy has much better flexibility and durability against fatigue than titanium. That's why it is used in airplane parts that under go flexing. Also, titanium is not a very good conductor of electricity. I think aluminum wins hands down for a condenser mic element. Of course, at this time, I haven't heard either except for the aluminum elements in ribbon mics, which prove to be quite lasting and continually flexible. I will soon invest in a large diaphragm condenser mic that has an aluminum membrane and give a report as to how it sounds compared to a comparably priced gold sputtered model.

[Sthibeault]

Aluminum in the proper alloy has much better flexibility and durability against fatigue than titanium. That's why it is used in airplane parts that under go flexing. Also, titanium is not a very good conductor of electricity. I think aluminum wins hands down for a condenser mic element. Of course, at this time, I haven't heard either except for the aluminum elements in ribbon mics, which prove to be quite lasting and continually flexible. I will soon invest in a large diaphragm condenser mic that has an aluminum membrane and give a report as to how it sounds compared to a comparably priced gold sputtered model.

Aluminium does NOT have good fatigue resistance. Fatigue resistance is actually one aluminum's biggest weakness.

Sent from my DROID RAZR using Tapatalk 2

[underthetire]

It's still better than titanium. Aluminum will stretch where titanium will crack. I have machined very tough carbon fiber, in the 100's of thousand pound range. It cuts ok, with rotary tools. Doesn't like to be turned as much. It is carbon, so production machining of it dry has to meet the states standard for "carbon foot print bs", and some states will only allow you to cut so much per day. Cutting it wet works quite well, but expensive filtration is required, otherwise the equipment turns to a hardened cement mess, and wears out equipment fast.