PLASTIC DEFORMATION OF TiAI INTERMETALLICS WITH Mn ADDITION
(Central South University of Technology, Changsha 410083, China)
Abstract: The dislocation structures of arc-melted, near-equiatomic TiAI alloys containing 1.5-2.0 wt.一%manganese were analysed and compared with those of binary TiAI alloy processed in a similar fashion. It was found that the pinning effect of a / 6 [ 112] partial dislocations was eliminated by Mn addition, as a result, the movement of a[101] and a/ 2[112] superdislocations and twinning and played an important role in the plastic deformation and increased the ductility of TiAI alloys. In addition, the workability of the Mn-ductilized TiAI alloy was evaluated with hot extrusion and forging.
Key words: TiAI alloys, Plastic deformation, dislocation structure