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Direct electric resistance heat treatment (DERHT) is especially suitable for the rapid functional property tailoring of NiTi alloys. However, the dependence of processing window and microstructural evolution of DERHT on the initial material state remains unclear so far. To clarify this issue, NiTi wires of 1mm in diameter with aged, non-aged, nanocrystalline and coarse-grained material states were...
The phase transformation behaviors of nanocrystalline NiTi alloys coupling with grain size poses a challenge in functional property configuration. To realize this configuration and simultaneously avoid undesirable grain growth, the low-temperature aging (LTA) treatment at 573K for 2h was applied to both the nanocrystalline and coarse-grained NiTi wires in this study and the effect of LTA on both the...
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