Mechanical Properties of the Ti49.8Ni50.2 Alloy after Multi-Axial Forging at 573 K

The mechanical properties of Ti49.8Ni50.2 (at %) alloy under tension at room temperature are studied in dependence on the true strain (e = 1.84–9.55) specified during isothermal multi-axial forging (abc-pressing). It was found that stress beginning pseudoyield plateau does not depend value abc-strain. after abs-pressing, already a e 1.84, yield σy 900 ± 25 MPa, which is more than twice as high compared to initial state specimens. With further increase abc-strain, continues slightly and reaches 1000 MPa 9.55. In this case, ultimate tensile strength samples increases by about 15%. strain-hardening coefficient ϴ dσ/dε III (linear) stage σ(ε) curve has similar e. shown abc-pressing with from 1.84 9.55, linearly increasing d−1/2 accordance Hall–Petch relation, where d average grain–subgrain size.