Strength anomaly of the B2 phase in Ti–25Al–25Zr alloy

Mechanical behaviour of the single B2 phase in the alloy Ti–25Al–25Zr has been studied under compression with different strain rates at elevated temperatures. The alloy Ti–25Al–25Zr exhibits yield strength anomaly similar to those of the typical B2 intermetallics such as FeAl. The stress–strain curves of the alloy tested at 400 °C show type C serrations which are considered to be due to dislocation unlocking. Intersecting and straight slip lines are observed in specimens tested at 400 °C and 600 °C, respectively.

► The yield strength anomaly has been reported in the Ti2AlZr alloy for the first time.
► The serrations observed in this alloy have been explained based on the site occupancies of the alloying elements.
► Intersecting and straight slip lines are observed in specimens tested at 400 °C and 600 °C, respectively.