called high entropy alloys . While alloys today contain a high proportion of one element with lower amounts of additional elements added, HEAs are made of an equal mix of each constituent element."The toughness of this material near liquid helium temperatures is as high as 500 megapascals square root meters. In the same units, the toughness of a piece of silicon is one, the aluminum airframe in passenger airplanes is about 35, and the toughness of some of the best steels is around 100.
As per the release, "the images and atomic maps generated from these techniques revealed that the alloy’s toughness is due to a trio of dislocation obstacles that come into effect in a particular order when force is applied to the material". "It’s amusing because metallurgists say that the structure of a material defines its properties, but the structure of the NiCoCr is the simplest you can imagine – it’s just grains," said Ritchie.
"However, when you deform it, the structure becomes very complicated, and this shift helps explain its exceptional resistance to fracture," added co-author Andrew Minor, director of the National Center of Electron Microscopy facility of the Molecular Foundry at Berkeley Lab and Professor of Materials Science and Engineering at UC Berkeley.CrCoNi and other HEAs are closer to being implemented for special applications.
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