Figure 6.
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Effect of ultrasonic vibration on surface smoothening in micro-coining process (a) cross-section images and SEM surface images of sloped surface of 600 °C annealed sample transferred with and without ultrasonic vibration, (b) surface roughness after micro-coining with and without ultrasonic vibration for different samples with different average grain size of 11, 23, and 45 μm.
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