Formation and Morphology of Twinning under High Strain Rate Deformation

Benny Herrmann, Arie Venkert, Alex Landau, Giora Kimmel, Dov Shvarts, Eugene Zaretsky

Research output: Contribution to journalArticlepeer-review

Abstract

The dynamic behavior of pure titanium was studied in planar impact experiments performed with 25 mm light-gas gun, at impact velocities of 150-550 m/sec. The sample’s free surface velocity was monitored by VISAR. Softly recovered samples were characterized utilizing XRD and optical, SEM and TEM microscopy. Metallographic examination of the cross section areas of the impacted samples revealed impact-oriented twin grid with significantly smaller twin concentration in the close vicinity of the spall plane. TEM studies revealed dense dislocation areas and twins in the samples, with profound micro twins and ordered dislocations cell structure near the spall plane. The results allow to estimation the relative contribution of dislocation and twinning mechanisms in shock-induced plastic deformation of titanium. The difference in the morphology of the area near the spall plane, in contrast to the rest of the sample, implies some stress reversibility in the behavior of both twins and un-arrested dislocations.

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