Abstract
The influence of temperature, T , and strain rate, ˙ε, on the reaction between
the 1/2[111](1¯10) edge dislocation line and a periodic row of 4 nm interstitial
dislocation loops with Burgers vector b = 1/2[1¯11] in α-Fe has been investigated
by means of molecular dynamics, using a potential developed recently for body
centred cubic Fe (Ackland et al 2004 J. Phys.: Condens. Matter 16 1). A
dislocation segment with b = [010] is formed by favourable reaction in all
cases: it is sessile in the (1¯10) glide plane and leads to the formation of a
screw dipole on the line under increasing stress. The mechanism controlling
line breakaway and the corresponding critical stress depend mainly on T rather
than ˙ε. At high T (300 and 600 K here) the length of the screw dipole is
short (
Original language | English |
---|---|
Pages (from-to) | 456211-456224 |
Journal | Journal of Physics: Condensed Matter |
Volume | 19 |
Issue number | 45 |
DOIs | |
State | Published - 16 Oct 2007 |