MICROTWINNING DEFORMATION IN PST TiAl CRYSTAL
PST双相TiAl类单晶中的微孪晶变形

The behaviour of microtwinning in TiAl PST crystal has been investigated by TEM. The results show that the microtwinning plane is(111) and microtwin results from the movement of (1/6)112] Shockley partials. The microtwinning can moved across the twin-related interface of lamellar TiAl phase without changing the twinsystem. These results indicate that the twin-related interface of TiAl can not hinder the microtwinning effectively. The effects of microtwinning on the deformation of PST crystal have been discussed.