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Fig. 4


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Macroscopic images of cross-sections of samples processed with (a) Plain cylindrical pin, (b) Square pin, (c) Tapered cylindrical pin, (d) Triangular pin, (e) CW Scrolled shoulder with cylindrical pin, (f) CW scrolled shoulder with square pin, (g) ACW scrolled shoulder with cylindrical pin (h) ACW scrolled shoulder with square pin.

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