PSI - Issue 2_B

Baturin A. et al. / Procedia Structural Integrity 2 (2016) 1481–1488 Author name / Structural Integrity Procedia 00 (2016) 000–000

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Fig. 1. Electron microscopic images of a typical microstructure of the UFG Ti 49.1 Ni 50.9 specimens.

Fig. 2. Microstructure and grain size distribution of the CG Ti 49.1 Ni 50.9 specimens.

When cooling and heating, the following sequence of martensitic transformation (MT) В2  В19  is realized in the CG specimens, and В2  R↔В19  for UFG specimens. The MT temperatures in the wire specimens of theTi 49.1 Ni 50.9 -alloy are shown in Table 1.

Table 1. Temperatures of martensitic transformation В2 ↔ R ↔ В19  in specimens of the Ti 49.1 Ni 50.9 -alloy (at.%).

State UFG

Т R , К М S , К М f , К А s , К А f , К

264

212 241

182 221

236 252

252 263

Recrystallization