DEFORMATION TWINNING IN INTERMETALLIC COMPOUNDS - THE DILEMMA OF SHEARS VS SHUFFLES

[摘要] In this paper the geometric description and general theory of mechanical twinning are reviewed, the twins in general lattices and superlattices are summarized, and the kinematic process by which mechanical twins form is revisited. A case study of mechanical twinning of HfV2 + Nb, a C15 (cubic) Laves phase, is presented and the synchroshear of selected atomic layers is proposed to explain the physical process of twin formation. If the twins form in this way, then long shear vectors and/or atomic shuffles are not really necessary.

[发布日期] 1993-10-01

[效力级别]  Proceedings Paper