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

作者：Park Chan Hee^*; Han S H; Kim Seong Woong; Hong Jae Keun; Nam Tae Hyun; Yeom Jong Taek

来源：Journal of Alloys and Compounds, 2016, 654: 379-383.

DOI：10.1016/j.jallcom.2015.09.088

• Nanostructured materials
• Elasticity
• Mechanical properties
• Calorimetry

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.

• 出版日期2016-1-5