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Feb 24, 2020, 11:13 am64 pts
ScienceDailyMetals get stronger as the size of the grains making up the metal get smaller -- up to a point. If the grains are smaller than 10 nanometers in diameter the materials are weaker because, it was thought, they slide past each other like sand sliding down a dune. But in samples of nickel with grain diameters as…
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