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Thermo-Mechanical Properties of an NiTi-Shape Memory Alloy after Dynamic Loading

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Grigorieva V., Danilov A., Razov A.

Acta Physica Polonica A

2015

vol. 128

issue 4

592-596

The results of the comparative study of a quasi-equilibrium NiTi alloy's thermo-mechanical response to high-rate and quasi-static straining in the temperature range of 100-300°C, which included the A_{f} and the M_{d} temperatures, are considered. The existence of B2 → B19' and B2 → R → B19' martensitic transformations, associated with the heterogeneous distribution of Ni₄Ti₃ precipitates is shown to result in shaping of martensitic and austenitic two-way shape memories, the simultaneous presence of which determines the reversing shape memory effect. The suppression of stress-induced B2 → B19' transformation at temperatures higher than the M_{d} temperature resulted in austenitic two-way shape memory only. Distinct dependences on the temperature of the critical stresses that initiate B2 → B19' and B2 → R → B19' martensitic transformations in austenite are shown to be the reason for the participation of the irreversible mechanisms of straining at the earliest stages of tension, whatever the strain-rate applied, thus annihilating the distinctions between the quasi-static and high-rate straining processes. As a result, the thermo-mechanical properties acquired after tension become practically independent of the strain-rate.

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1 Acta Physica Polonica A

1 2015

1 Danilov A.

1 Grigorieva V.

1 Razov A.

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Thermo-Mechanical Properties of an NiTi-Shape Memory Alloy after Dynamic Loading