Plastic Anisotropy of Ti3Al Single Crystals

Electron microscopic study of Ti3Al microstructure after deformation at 1073–1273 K

“…Some effect can also be due to a small deviation of the chemical composition of the alloy studied. Notice that in [1][2][3][4]10], like in our studies [6,20], c dislocations were not observed after deformation over the interval from room temperature to T = 673 K.…”

“…Williams and Blackburn [12] have reported the presence of only very few c + a dislocations in Ti 3 Al deformed to about 3% strain. Similarly, Lipsitt et al [25] reported a low incidence of c + a dislocations in specimens deformed in tension up to a temperature of 1173 K. A high density of c + a superdislocations was observed during cyclic deformation [9] and creep [11] only.…”

“…The yield stress y (T) monotonically decreases with increasing temperature with a pronounced temperature dependence at lower temperatures, while the elongation is ε ∼ 250% even at room temperature [1]. In the case of the basal slip 1/3 1 12 0 (0 0 0 1) the yield stress at room temperature falls within the interval y ∼ 150-300 MPa [1][2][3][4]. The yield stress y decreases and falls within the interval of ∼60-170 MPa, as the temperature rises to T ∼ 1200 K, At room temperature the elongation equals ε ∼ 1-5% [6].…”

“…The maximum temperature of their practical applications as a high-temperature material is determined by the temperature and orientation dependences of the deformation characteristics of this alloy. The deformation behavior of Ti 3 Al over a wide interval of temperatures has been much investigated experimentally and theoretically [1][2][3][4][5]. The smallest yield stress is observed in the case of the prismatic slip 1/3 1 12 0 {11 0 0}.…”

“…In the case of the pyramidal slip 1/3 1 12 6 {11 2 1} or 1/3 1 12 6 {2 0 2 1} an anomalous temperature dependence and a peak in the y (T) curve are observed in experiments [1][2][3][4][5]. The temperature of the peak is T p ∼ 870 K [1] to 1100 K [2].…”