Abstract
Dislocation slip is investigated in a metastable β titanium alloy with the Ti-23Nb-0.7Ta-2Zr-0.4Si composition (at.%) by in situ straining experiments in a transmission electron microscope. Moving dislocations have a/2 〈1 1 1〉 Burgers vectors and glide in {1 1 0}, {1 1 2} or {1 2 3} planes. The mobility of screw dislocations is lowered by punctual defects and the existence of a stable and sessile core configuration that has to recombine in order to allow dislocations to glide.
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