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Table 4 Average grain diameter of various regions

From: The effect of pin profiles on the microstructure and mechanical properties of underwater friction stir welded AA2519-T87 aluminium alloy

Pin profile

SZ (μm)

AS-TMAZ (μm)

RS-TMAZ (μm)

RS-HAZ (μm)

PM (μm)

FSW-THC

17.5

85

85

64

49

FSW-TTC

15

82

82

60

UWFSW-THC

5.2

54

54

52

UWFSW-TTC

3.3

50

50

49