(北京航空材料研究院，100095)
摘 要: 研究Ti-47.5Al-2Cr-2Nb-0.2B全片層組織室溫變形結(jié)構(gòu)中γ/γ片層間變形協(xié)調(diào)行為。引入多晶體塑性變形的幾何協(xié)調(diào)因子m，并利用矩陣分析方法計算120˚旋轉(zhuǎn)有序型、真孿晶型和偽孿晶型γ/γ界面兩側(cè)片層中各種滑移系之間的m值，與實驗結(jié)果比較發(fā)現(xiàn)，通過計算m值可以預(yù)測不同類型γ/γ界面兩側(cè)片層中的有效滑移系，120˚旋轉(zhuǎn)有序型γ/γ界面幾何協(xié)調(diào)性最好，1/6
關(guān)鍵字: TiAl合金；片層組織；變形協(xié)調(diào)；孿晶；位錯；晶體位向
（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
