A method to enhance cyclic reversibility of NiTiHf high temperature shape memory alloys

作者：Kockar B; Karaman I^*; Kim JI; Chumlyakov Y

来源：Scripta Materialia, 2006, 54(12): 2203-2208.

DOI：10.1016/j.scriptamat.2006.02.029

• NiTiHf
• severe plastic deformation
• high temperature shape memory alloys
• two-way shape memory effect
• equal channel angular extrusion

The effect of severe plastic deformation via equal channel angular extrusion (ECAE) at 650 degrees C on the thermal cyclic response of the 49.8Ni-42.2Ti-8Hf (in at.%) high temperature shape memory alloy was investigated. The improved thermal cyclic stability under constant tensile stresses in the ECAEd samples was attributed to the increase in critical shear stress levels for dislocation slip, which would accompany the martensitic phase transformation, due to the microstructural refinement and increase in favorable dislocation density. @ 2006 Acta Materialia Inc. Published by Elsevier Ltd.

• 出版日期2006-6