tructure which leads to the complete dissolution and transformation of secondary α-phase Р (αs) particles into β-phase. This weakens the crack growth resistance of the alloy obviously. Due to Р the evident fencing effect of αL on intragranular deformation, the nanocrystallization at the crack-Р tip region of lamellar microstructure is not obvious, and a relatively high density of αs phase Р particles are still retained. Therefore, the lamellar microstructure has a relatively higher resistance Р to crack growth. Р Key words: Ti -55511 alloy; microstructure; fatigue properties; fatigue damage mechanism Р Р
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