【摘要】 用透射电镜观察了在不同温度、不同时间时效时Ll0－TiAl金属间化合物中形成的Ll2－（Al，Ag）3Ti，Ti3AlC析出相的形态以及与基体之间的位向关系，讨论了析出相的形态与TiAl基体间的错配度的关系．更多还原

【Abstract】 A trasmission electron microscopy (TEM) investigation has been performed on the moerphologies of Ll2-(Al,Ag),Ti and Ti3AIC precipitates in Ll0-ordered TiAl(Ag). During aging at temperatures around 1073 K after quenching from 1473 K, TiAl(Ag) hardens by the precipitation of (Al,Ag)3Ti and Ti3AIC. TEM observations revealed that plate-like precipitates (Al,Ag)3Ti lie on (001) plane of TiAl(Ag) matrix and needle--like pricipitates Ti3AlC, which lie only in one direction parallel to the [001] axis of the TiAl(Ag) matrix, appear after longer period aging or higher temperature aging. The anisotropic misfits between TiAl matrix and Ll2-(Al,Ag)3Ti and Ti3AIC can be considered to explain the morphologies of (Ag,Al)3Ti and Ti3AIC precipitates.更多还原