【摘要】 TEM原位拉伸研究表明，尽管双相层片型TiAl基合金中与α2相共存的γ层片相的（1／2）＜110]位错具有良好的可滑移性，并在一些γ层片中（1／6）＜112]形变孪生也较为活跃，但对变形有贡献的滑移系统及孪生系统数目少是室温塑性差的重要原因提高多晶体双相TiAl基合金室温塑性的关键在于促使（1／2）＜110]{111）以外的滑移系开动.更多还原

【Abstract】 In situ TEM tensile experiments show that the principal reason for the poor ductility at room temperature of TiAl base alloys with lamellar structure is the lack of slip systems, eventhough (1/2)＜110] ordinary dislocations exhibit good mobility and (1/6)＜112] deformation twinning is activited in some γ-lamella phase. The key to improve the room temperature ductility of TiAl base alloy is to operate other slip systems apart from (1/2)＜110]{111).更多还原