Effects of Mechanical Treatment and Pre-Deformation on Shape Recovery Stress of Ti₅₀Ni₄₇Fe₃ Shape Memory Alloy

Abstract:

Effects of mechanical treatment, pre-strain and pre-deformation temperature on shape recovery stress of Ti₅₀Ni₄₇Fe₃ shape memory alloys were investigated. Mechanical treatment, consisting of hot-rolling and hot-forging, improved σrmax σrmax (maximum recovery stress), dσr/dT (rate of recovery stress with temperature) and T_s (the temperature at which recovery stress rises sharply). Martensitic transformation and reverse transformation temperatures also increased with increasing the hot-rolling deformation. σrmax and dσr/dT increased with increasing pre-strain at first and then decreased with further increasing of pre-strain, and the maximum values of σrmaxand dσr/dT were obtained at a pre-strain of 10%. On the other hand, σrmaxand dσr/dT decreased with increasing pre-deformation temperature. Upon a hot-rolling of 88% area reduction and pre-deformation of 10% at-150°C, the Ti₅₀Ni₄₇Fe₃ alloy exhibited excellent recovery stress property with the σrmax of 391MPa in combination with dσr/dT of 5.09.

• Periodical: Materials Science Forum (Volume 787)
• Pages: 267-274
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.787.267
• Online since: April 2014
• Authors: Yu Zhang, Fu Shun Liu*
• Keywords: Mechanical Treatment, Pre-Deformation, Shape Memory Alloy (SMA), Shape Recovery Stress

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