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The ring pattern from the new transmission X-ray diffraction analysis is from the polycrystalline nature of the alloy - in other words, it indicates that the atoms are arranged in small crystalline regions (called grains) that have many different orientations.

Finding a Needle in a Crystalline Haystack

New X-ray technique reveals the presence of one-in-a-million large crystalline regions from metals fatiguing—stabilization schemes could lead to impervious metals.

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