Investigation of the Deformation Activation Volume of an Ultrafinegrained Ti50Ni50 Alloy

Gunderov D.; Churakova A.; Lukianov A.; Prokofiev E.; Prokoshkin S.; Kreizberg A.; Raab G.; Sabirov I.

Investigation of the Deformation Activation Volume of an Ultrafinegrained Ti50Ni50 Alloy

Gunderov D., Churakova A., Lukianov A., Prokofiev E., Prokoshkin S., Kreizberg A., Raab G., Sabirov I.

Дата публикации: 2015

Дата публикации в реестре: 2020-02-29T23:19:36Z

Аннотация:

© 2015 Springer Science+Business Media New York The mechanical properties, strain rate sensitivity (m) and deformation activation volume (ΔV) are investigated at the experimental temperatures from 20 to 400°С in a Ti50Ni50alloy in a coarse-grained (CG) state with the austenite grain size D = 200 μm and in an ultrafine-grained (UFG) state with D = 700 μm following an ECAP treatment. It is observed that this treatment improves the yield strength of the alloy compared to its CG-state. The strain rate sensitivity, m, is found to be by a factor of 1.5–2 higher than that of CG-specimens; it increases with the temperature in both states of the material. As the temperature of the material in tension increases up to Т = 150–250°С, parameter ΔV increases to its maximum and with a further growth of the experimental temperature to 400°С, parameter ΔV decreases. The deformation activation volume of the alloy in the UFG-state is by a factor of 2–4 larger than that in the CG-state for the same experimental temperatures.

Ключевые слова:
deformation activation volume, deformation behavior, nanocrystalline and ultrafine-grained structure, shape memory alloys, strain rate sensitivity of yield stress

Тип: Article in Press

Источник: SCOPUS10648887-2015-SID84944930290