Precipitation behavior of (Al,Ag)3Ti and Ti3AlC in L10-TiAl in Ti-Al-Ag system |
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| Affiliation: | 1. Research unit UR-MPE, University of Boumerdes, 1 Avenue de l''Independance, 35000 Boumerdes, Algeria;2. Groupe de Physique des Matériaux, Université et INSA de Rouen, UMR CNRS 6634 -Normandie Université, F-76801, Saint Etienne duRouvray, France;3. INRIM, Nanoscience and Materials Division, strada delle Cacce 91, 10135 Torino (TO), Italy;4. ENMC Laboratory, Department of Physics, Faculty of Sciences, University Ferhat Abbas, Setif 19000, Algeria;1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, China;2. National & Local Joint Engineering Research Center for Precision Thermalforming Technology of Advanced Metal Materials, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, China |
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| Abstract: | A transmission electron microscopy (TEM) investigation has been performed on the morphologies of L12-(Al,Ag)3Ti and Ti3AlC precipitates in L10-ordered TiAl(Ag). During aging at temperatures around 1073 K after quenching from 1273 K, TiAl(Ag) hardens by the precipitation of (Al,Ag)3Ti and Ti3AlC. TEM observations revealed that plate-like (Al,Ag)3Ti precipitates lie on {001} planes of TiAl(Ag) matrix in the short aging period and the habit plane changed from {001} to {hhl} after a long period aging or high-temperature aging and finally to {112} of the matrix lattice. At the same time needle-like precipitates Ti3AlC, which lie only in one direction parallel to the 001] direction of the TiAl(Ag) matrix, appear after long period aging or high-temperature aging. The anisotropic misfits between TiAl(Ag) matrix and L12-(Al,Ag)3Ti and Ti3AlC are considered to explain the morphologies of L12-(Al,Ag)3Ti and Ti3AlC precipitates. |
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