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How would the supermetal known as Ledrine form under natural conditions?

Any environment within our solar system is eligible for this purpose.

Ledrine has the following properties:

  • withstand impacts of 20gs minimum. preferably capable of withstanding impacts up to 100gs (i.e. Superman/flying type superhero/jet crashing in at mach 3-5).

  • able to withstand 7–8 degree earthquakes.

  • 3 times lighter than industrial steel.

and considering this will be a city's reinforcement material (like Chicago's buildings having reinforcements against the wind speeds)

non-radioactive

just putting that out there as redundancy. never can be too careful with the internet.

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    $\begingroup$ My google turned up nothing for Ledrine. Did you just make it up? Also re withstanding impacts: a 1 cubic kilometer cube of Ledrine will do fine, but a shack made of a thin sheet of Ledrine not so much. The stability of a structure has a huge amount to do with the construction of the structure. $\endgroup$
    – Willk
    Commented Nov 18, 2017 at 21:43
  • $\begingroup$ yes I made it up. It's for the same setting as my Yacht question. and ummm good to know about the cubic kilometer redundant of ledrine would do. writes that down for spaceship hull $\endgroup$ Commented Nov 18, 2017 at 21:46
  • $\begingroup$ It would form by magic. $\endgroup$ Commented Nov 18, 2017 at 21:58
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    $\begingroup$ This is an imaginary metal, why can't you just make up how it is formed? Since the metal doesn't exist, there is no 'answer' to how it forms. I am voting to close this question as 'primarily opinion-based' because it is asking for someone to make up a story for you. $\endgroup$
    – kingledion
    Commented Nov 19, 2017 at 2:48
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    $\begingroup$ This sounds like the mighty element known as Handwavium $\endgroup$
    – L.Dutch
    Commented Nov 19, 2017 at 5:27

1 Answer 1

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Your super metal is aluminum.

It is a third the weight of steel.
It is non radioactive.

As regards its performance in structures, that is up to your engineers. One can make a temple out of bamboo that withstands a typhoon. One can make a skyscraper out of steel girders that falls down a few months later. Let them use the aluminum to make structural elements that suit their needs, and assemble them in ways that pass your proposed stress tests.

Aluminum is used extensively for construction, but generally in structures where the light weight as worth the added cost - for example, planes.
aluminum structural elements

http://www.tms.org/pubs/journals/JOM/0102/Sanders-0102.html

We have some aluminum here on earth.

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    $\begingroup$ Al on earth is not found as a metal, but needs high energy processing to isolate the pure element. $\endgroup$
    – JDługosz
    Commented Nov 19, 2017 at 0:53
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    $\begingroup$ Also, from Wikipedia : "One important structural limitation of aluminium alloys is their fatigue strength. Unlike steels, aluminium alloys have no well-defined fatigue limit, meaning that fatigue failure eventually occurs, under even very small cyclic loadings." and "Another important property of aluminium alloys is sensitivity to heat." Basically... aluminium is not a good choice for permanent structural elements, so using it for "city reinforcement" would probably end with collapsed buildings. And while there wasn't convenient short quote, fires would be needlessly hazardous. $\endgroup$ Commented Nov 19, 2017 at 1:23
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    $\begingroup$ OK @Ville Niemi if you want to get into the weeds with this Ledrine concept. We will use aluminum beryllium alloy. "The Al-Be alloy with a high modulus-to-density ratio (3.8 times that of aluminum or steel) greatly reduces the chance of flexure and mechanical failure. "reade.com/products/aluminum-beryllium-al-be-alloy. $\endgroup$
    – Willk
    Commented Nov 19, 2017 at 3:08
  • $\begingroup$ Additionnally you can introduce other elements to modify the structural properties of it (Carbon nanotube metal matrix composites for ex) $\endgroup$ Commented Nov 19, 2017 at 3:36
  • $\begingroup$ @Will My thoughts tended to an alloy as well. However, the key criterion was 'under natural conditions'. Not sure if this allows deliberate synthesis. $\endgroup$ Commented Nov 19, 2017 at 3:38

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