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2017-4-1 · The thin foils at different depths of the deformation layer for TEM observations were prepared in the following steps: (i) polish the top surface to a given depth and then cut off one piece (1.5 mm × 1.5 mm × 10 mm in size) from the opposite side, (ii) put it into a 3-mm-in-diameter copper tube and bond them together, (iii) grind it carefully to approximately 30 μm in thickness via SiC paper with different …
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