"...A typical carbon nanotube can be stretched to 15 percent longer than its original length before it fails. But in the high-temperature experiments, the heated nanotube was able to stretch to more than 280 percent of its original length before it broke. The researchers took a 24-nanometer piece of nanotube and stretched it to 91 nanometers before it failed, while the diameter was reduced by 15 times from 12 to 0.8 nanometers.
“This kind of intense stretching and reduction in diameter in a carbon nanotube is unprecedented,” Wang said. “This super-elongation is due to a full plastic deformation that occurs at high temperatures.”
Under such high temperatures, the nanotube appears to be completely pliable, resulting in a superplastic deformation that would otherwise be impossible at low temperatures..."
https://publicaffairs.llnl.gov/news/news_releases/2006/NR-06-01-06.html
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