Open AccessLow-temperature processing of Ti-Ni shape memory alloy by E.C.A.P. in shells
Author(s) -
R. D. Karelin,
I. Yu. Khmelevskaya,
Victor Komarov,
T. R. Kosyachkova,
В. А. Андреев,
М. М. Перкас,
V. S. Yusupov,
С. Д. Прокошкин
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1758/1/012014
Subject(s) - materials science , annealing (glass) , ultimate tensile strength , hardening (computing) , alloy , atmospheric temperature range , composite material , metallurgy , pressing , deformation (meteorology) , shape memory alloy , work hardening , microstructure , physics , layer (electronics) , meteorology
The possibility of Ti-50.1 at.% Ni SMA processing by the equal-channel angular pressing (ECAP) in core-shell mode at low deformation temperatures was studied in the present work. The ECAP was performed in steel and iron shells in a temperature range from room temperature to 350 °C. Ti-Ni samples with a diameter of 12 mm were successfully subjected to ECAP for one pass at 200 °C in iron shell with a diameter of 20 mm. Lowering of the deformation temperature both to the 100 °C and to the room temperature leads to the samples distraction during the first ECAP pass. Significant deformation hardening of the sample after one pass of the ECAP in core-shell mode at 200 °C is observed. Increase of the structure defectiveness confirmed by the noticeable broadening of forward (from 26 to 103 °C) and reverse (from 20 to 46 °C) martensitic transformations hysteresis. Values of hardness, dislocation yield stress, and ultimate tensile strength after one pass of the ECAP in core-shell mode at 200 °C equals respectively, 275 HV, 1045 and 1200 MPa, that is noticeably higher than the same properties after reference treatment (annealing at 750 °C, 30 min): 176 HV, 520 and 945 MPa.