An effective approach to produce a nanocrystalline Ni-Ti shape memory alloy without severe plastic deformation

초록

Bulk nanocrystalline (d = 20-40 nm) Ni-Ti shape memory alloy was produced via cold marforming, followed by optimum post-heat treatment. The total accumulative strain (epsilon similar to 0.7) during the process was much lower than that typically imposed during severe plastic deformation operations (i.e., 5 <= e <= 12). In-situ heating transmission electron microscopy revealed that the present process was effective in promoting static recrystallization and limiting grain growth. The nanocrystalline alloy exhibited enhanced shape memory behaviors. (C) 2015 Elsevier B.V. All rights reserved.

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