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An Aluminized Future World?

Posted July 10, 2011 6:00 AM

Is aluminum the material of the future? If you accept the opinion of Alcoa CEO Klaus Kleinfeld, it is. During the next 50 years, demand will create an "aluminized world," he predicts, citing urbanization and the need for efficient transportation and infrastructure. Will aluminum be the key to fuel-efficient cars, airplanes, and trains of the future, or will new composites and nanotech-enhanced materials dominate?

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#1

Re: An Aluminized Future World?

07/10/2011 10:28 PM

One might say the same for Titanium, with it's greater strength and many other attributes. It is not as abundant as Aluminium, and Titanium does not have a cheap process to extract from the oxide, like the Hall Process does for Al- but, many smart chemists are at work on making an electrically efficient Ti process.

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#2

Re: An Aluminized Future World?

07/10/2011 10:32 PM

Klaus is just trying to boost his company. Aluminum hasn't even replaced steel for aircraft structural tubing, and is steadily loosing market share to composites for skins. The energy used to manufacture it won't be getting any cheaper, so it will remain a niche market.

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#3

Re: An Aluminized Future World?

07/11/2011 12:24 AM

Steel objects can be made lighter than aluminum ones because the per pound tensile strength of steel is much higher than aluminum. Classic case is the weight of a steel wire is less than an aluminum wire that will lift a 100 pound object.

The varieties of steel are much greater than aluminum.

With modern casting techniques and CNC machining it has becoming practical to machine objects of steel rather than rely on a bulk of aluminum to transfer stresses. An airplane made with aluminum tubing would weight more than one made with steel tubing.

Steel forming is much more advanced than aluminum forming.

Steel welds easier and better than aluminum.

Steel has a maximum load failure amount below which the steel will never fail. Aluminum will always fail over time even without any load.

Steel has a much lower coefficient of thermal expansion than aluminum which makes it more stable in large objects, assemblies, and composites.

Steel bonds better and more easily with structural adhesives than aluminum.

Steel coatings and plating have advanced to a much higher level than with aluminum.

Aluminum transfers heat and electricity better than steel.

Aluminum gets stronger at cryogenic temperatures while steel gets weaker.

Overall steel will be more widely used forever.

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#8
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Re: An Aluminized Future World?

07/15/2011 7:31 PM

But when you mix Al with Zinc, Magnesium, Chrome, and maybe few % of other materials you already get a 90% of steels strengths

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Re: An Aluminized Future World?

07/15/2011 9:52 PM

Fortal a proprietary brand of 7075T aluminim is stronger and harder than mild steel but not even close to steel alloys and costs a lot a more.

That being said I use Fortal on a regular basis for making billiard cue components in my business True Heart Billiard Cues to save on weight. I use more composites and stainless steel than aluminum.

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#4

Re: An Aluminized Future World?

07/11/2011 1:46 AM

i think Klaus is forgeting carbon fibers

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#5

Re: An Aluminized Future World?

07/11/2011 3:32 AM

Aluminium production relies on copious amount of electricity and "carbon" emmissions. Therefore the Greenies and their fellow travellers frown upon it. Besides, it will only pe produced in countries that do not tax CO2.

Please excuse this rant but I am still reeling under the Carbon Tax just announced in Australia.

Royce

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#6

Re: An Aluminized Future World?

07/11/2011 6:33 PM

Especially transparent aluminum. Right, captain Kirk?

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#7

Re: An Aluminized Future World?

07/11/2011 7:53 PM

Yes, Truehearth #3 is absolutely right. And to my delight, the other respondents were right, mainly.

As aluminum is one of the most abundant element in earth's crust, titanium not much behind, the question is - at least on the long scale - is rather academic. Let me explain it. A good century ago metallic aluminum was lousy soft, and precious. Due its TEMPORARY scarcity. No more.

Titanium is the same, temporarily, no more.

For the future - I would say with an unshakable certainity - all of the above, and many more. Be ready, that what you do not know about future, will surprise you.

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