(北京航空材料研究院，100095)
摘 要: 研究Ti-47.5Al-2Cr-2Nb-0.2B全片层组织室温变形结构中γ/γ片层间变形协调行为。引入多晶体塑性变形的几何协调因子m，并利用矩阵分析方法计算120˚旋转有序型、真孪晶型和伪孪晶型γ/γ界面两侧片层中各种滑移系之间的m值，与实验结果比较发现，通过计算m值可以预测不同类型γ/γ界面两侧片层中的有效滑移系，120˚旋转有序型γ/γ界面几何协调性最好，1/6
关键字: TiAl合金；片层组织；变形协调；孪晶；位错；晶体位向
（Beijing Institute of Aeronautical Materials, Beijing 100095, China）
Abstract:The compatibility of deformation in fully lamellar microstructure of Ti-47.5Al-2Cr-2Nb-0.2B alloy at room temperature was studied. A geometric compatibility factor m was calculated by matrix operation to compare the compatibility between two slip systems in two neighboring γ lamellae with 120˚-rotational, true-twin and pseudo-twin relationships. The experimental results show that the effective slip systems between two neighboring γ lamellae can be predicted by calculation of the m values. Among the three type γ/γ interfaces, the compatibility between 120˚-rotational ordered interface is the best, the deformation of 1/6 {111} twinning in one γ lamella can transfer into another γ lamella by 1/2 {111} ordinary dislocation slip. For true-twin interface, 1/6 {111} twin can propagate into a neighboring γ lamella through 1/6 {111} twinning.
Key words: TiAl alloy; fully lamellar microstructure; deformation compatibility; twin; dislocation; crystal orientation
