Science, Space and Technology News 2023
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“We didn’t set out to find healing. My student, Guoxiang Xu, was doing simulations on fracture,” Demkowicz said. “We accidentally observed spontaneous healing in one of his simulations and decided to follow up.” He further explained that nanocrystalline metals make studying self-healing easier because their small grain size allows for more microstructural features that even small cracks can interact with.
One condition common to both the 2013 theory and the recent experiment is that both were conducted in vacuum environments, devoid of foreign matter. Such outside matter could interfere with crack surfaces’ ability to bond, or cold-weld, back together. Even with this limitation, applications could still be possible for spacefaring technology or internal cracks that are not exposed to outside air.
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