New super strong alloy discovered
September 8, 2010
Dr Peter Liddicoat next to the atom probe.
(PhysOrg.com) -- International team of researchers has discovered a new super-strength light alloy and had their key findings published in Nature Communications.
A North Carolina State University researcher and colleagues have figured out a way to make an aluminum alloy, or a mixture of aluminum and other elements, just as strong as steel.
That's important, says Dr. Yuntian Zhu, professor of materials science and the NC State researcher involved in the project, because the search for ever lighter - yet stronger - materials is crucial to devising everything from more fuel-efficient cars to safer airplanes.
In a paper published in the journal Nature Communications, Zhu and his colleagues describe the new nanoscale architecture within aluminum alloys that have unprecedented strength but also reasonable plasticity to stretch and not break under stress. Perhaps even more importantly, the technique of creating these nanostructures can be used on many different types of metals.
Zhu says the aluminum alloys have unique structural elements that, when combined to form a hierarchical structure at several nanoscale levels, make them super-strong and ductile.
The aluminum alloys have small building blocks, called "grains," that are thousands of times smaller than the width of a human hair. Each grain is a tiny crystal less than 100 nanometers in size. Bigger is not better in materials, Zhu says, as smaller grains result in stronger materials.
Zhu also says the aluminum alloys have a number of different types of crystal "defects." Nanocrystals with defects are stronger than perfect crystals.
The unexpectedly high level of strengthening appears to be due to two factors. Firstly, the way that the alloying elements are arranged within the grains is thought to increase the dislocation-storage capacity of the alloy. Secondly, the clustering of elements between the grains could limit nanocrystal growth, increase the cohesion of the grains, and resist embrittlement and defect generation.
Imaging of nano-sized grains inside an aluminum alloy. Colored blobs show the grains: colored dots show clusters of zinc and magnesium atoms that strengthen the material. (Yonghao Zhao/UC Davis graphic)
Now, Zhu plans on working on strengthening magnesium, a metal that is even lighter than aluminum. He's collaborating with the Department of Defense on a project to make magnesium alloys strong enough to be used as body armor for soldiers.Zhu's colleagues on the Nature Communications paper are affiliated with the University of Sydney in Australia; the University of California, Davis; and Ufa State Aviation Technical University in Russia.
More information: "Nanostructural hierarchy increases the strength of aluminium alloys" Authors: Yuntian Zhu, North Carolina State University; Peter Liddicoat, Simon P. Ringer and Xiao-Zhou Liao, University of Sydney; Yonghao Zhao and Enrique J. Lavernia, University of California, Davis; Maxim Y. Murashkin and Rusian Z. Valiev, Ufa State Aviation Technical University. Published: Sept. 7, 2010, in Nature Communications.
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Sep 08, 2010
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I thought it was because you were a rather lucid indigent who really enjoyed smoking his plants.
Sep 08, 2010
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When your headline reads: "New super strong alloy discovered", you better be able to back that up with something. So much hyperbole on this site.....
Sep 08, 2010
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Transparent aluminum: http://en.wikiped...aluminum
Neutronium: http://memory-alp...utronium
Tritanium: http://memory-alp...ritanium
Duranium: http://memory-alp...Duranium
Sep 08, 2010
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Is anyone else struck by the potential for unintended consequences inherent in this notion?
I don't think that I would want to be wearing magnesium-alloy body armor in a firefight.
What if the developer/manufacturer overlooked some critical chemical-bonding or energy-state discontinuity in the alloy, and this stuff started oxidizing while you were wearing it? Being cooked like a turtle in its shell is something that holds no appeal for me.
Sep 08, 2010
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Sep 08, 2010
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http://www.g2mil....inum.htm
Sep 08, 2010
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Exactly. Plus I once watched a burning VW bus's engine catch fire in exactly the same way. It was fascinating. Obviously a big problem, though.
Sep 08, 2010
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Sep 08, 2010
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Sep 09, 2010
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http://www.gizmag...l/16307/
Sep 09, 2010
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Sep 09, 2010
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I hear at Burning Man there are a few groups of people who buy old magnesium engine blocks and burn them in a pit at the show. Could you imagine if some high raver kid fell in there? No one would ever even know unless they saw him go in.
Sep 09, 2010
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Sep 11, 2010
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Put that in yer thinker and smoke it.
Sep 12, 2010
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Yeah, sometimes that happens, but that is what Google is for: http://www.nature...062.html
The impressive part of the report is that these are two standard aluminium alloys subjected to rapid quenching. (Fast cooling.) If the crystal structure maintains itself over long periods of time (decades) This is a fairly simple added step in manufacturing with no added raw materials.
Sep 12, 2010
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Sep 12, 2010
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If you did this, you did it with a magnesium block. (Not necessarily a car engine block.) The ignition temperature of magnesium is high, but so is the conductivity. Try to light the corner of a block, and you can try all day--the conductivity takes away more heat than convection and radiation heating can transfer in.
Which means you can burn holes in magnesium rather than drilling them. If you do it with a laser from below, the magnesium dripping out of the hole provides most of the heat needed.
It just looks so cool to see the drops coming out of the hole burning, and disappear within a foot or so. (They float on the laser beam. ;-)
If you want to ignite magnesium, cut some cross-hatching in one corner.