Why magnesium alloy????

Started Apr 19, 2013 | Discussions thread
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(unknown member) Veteran Member • Posts: 3,348
Re: Titanium vs. aluminum strength to weight ratios...

Joseph S Wisniewski wrote:

trekkeruss wrote:

leicaman wrote:

Magnisium is hard, light and cheap... it can be cast.

Aluminum must be machined and is heavier.

Titanium is the best, lighter and stronger but is hard to machine and hugely expensive.

Titanium is heavier than both aluminum and magnesium.

And that matters why?

Titanium has a strength to weight ratio of  288 kN·m/kg, nearly twice that of magnesium at 158 kN·m/kg. So, something the same weight is twice as strong when made from titanium. Or, if you're aiming for a specific strength, the titanium part is half the weight,

It is more commonly used as a lighter weight replacement for steel.

Except that it's not. Most steels have a higher strength to weight ratio than titanium. So it's worse if you're designing to a particular strength or a particular weight. Where titanium shines is that it's half the density of steel, so if you're designing to a particular volume, it may be adequately strong for your purpose, although weaker than a  steel part of the same volume.

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Rahon Klavanian 1912-2008.
Armenian genocide survivor, amazing cook, scrabble master, and loving grandmother. You will be missed.
Ciao! Joseph

I believe Titanium is also much more resistant to corrosion than most steels so is used when that is important.

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