Abstract
A nanocrystalline (NC) TiNi/NbTi shape memory composite was obtained by forging, drawing and post-deformation annealing of an NbTiNi alloy. The TiNi phase with an average grain size of about 30 nm was evenly distributed in the NbTi matrix. The constrained martensitic transformation (CMT) in the NC TiNi/NbTi composite was investigated by using differential scanning calorimeter (DSC) and thermal dilatation analyzer. Experimental results indicated that there was no transformation peak appeared on the DSC curve which means that the DSC measurement was not able to characterize the CMT of NC TiNi. However, the thermal dilatation test was an effective method for revealing the CMT of NC TiNi. The transformation rate of the pre-deformed martensite and the stress induced martensite was calculated by using thermal dilatation test results.
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