Deformation mechanism of severely deformed CP-titanium by uniaxial compression test

Abstract

Conventional uniaxial compression test, designed to yield an effective strain of ∼1, was carried out to understand the deformation mechanism of severely deformed commercial pure titanium at various temperatures. TEM analysis showed that only [101̄1] twins accompanied with (a) slip dislocations were activated on non-basal planes in samples compressed at 573 and 623 K. In particular, the whole area of the sample compressed at 623 K were covered with [101̄1] twin bands with a width of 200 nm. However, (a + c) slip instead of [101̄1] twinning were found in samples compressed at 673 and 823 K. This indicates that [101̄1] twinning plays an important role in accommodating severe plastic strain before the activation temperature of (a + c) slip. © 2008 The Japan Institute of Metals.