Effect of ambient temperature on compressibility and recovery of NiTi shape memory alloys as static seals

The objective of this study was to investigate the effect of ambient temperature on compressibility and recovery of NiTi shape memory alloys as static seals. Experimental results indicated that compressibility and recovery of NiTi alloys were dependent on ambient temperature. At T < Af (the austenite finish temperature), the compressibility and recovery coefficients were almost unchanged when the compression stress was higher than a certain level. The residual strain of NiTi alloys increased with a decrease in temperature at T < Af. The residual strain of NiTi alloys was remarkably high at the temperature below Mf (the martensite finish temperature). The recovery coefficient of NiTi alloys at T > Af gradually increased with increasing compression loading. The compressibility and recovery coefficients of NiTi alloys were insignificantly fluctuated at the temperatures between 60°C and 150°C upon the compression loading. The features of strong deformation and martensite reorientation in the compressed NiTi alloys confirmed the temperature effect.

[1]  Sia Nemat-Nasser,et al.  Strain rate dependence of deformation mechanisms in a Ni–Ti–Cr shape-memory alloy , 2005 .

[2]  Anatoly Efremov,et al.  Bolted Flanged Connection for Critical Engineering Applications , 2006 .

[3]  Jun Sun,et al.  Origin of 2-stage R-phase transformation in low-temperature aged Ni-rich Ti–Ni alloys , 2005 .

[4]  Wei Chen,et al.  Precipitation kinetics of Ti3Ni4 in polycrystalline Ni-rich TiNi alloys and its relation to abnormal multi-stage transformation behavior , 2006 .

[5]  Yinong Liu,et al.  Lüders-like deformation associated with stress-induced martensitic transformation in NiTi , 2004 .

[6]  Gunther Eggeler,et al.  Ni4Ti3-precipitation during aging of NiTi shape memory alloys and its influence on martensitic phase transformations , 2002 .

[7]  Yong Liu,et al.  Dynamic deformation of shape-memory alloys: Evidence of domino detwinning? , 2002 .

[8]  W. K. Nowacki,et al.  Temperature evolution in deformed shape memory alloy , 2002 .

[9]  E. Cesari,et al.  Effect of precipitates on the stress–strain behavior under compression in polycrystalline Ni–Fe–Ga alloys , 2008 .

[10]  Gunther Eggeler,et al.  Multiple-step martensitic transformations in Ni-rich NiTi shape memory alloys , 2004 .

[11]  Martin Leary,et al.  A review of shape memory alloy research, applications and opportunities , 2014 .

[12]  Li Hu,et al.  Transformation twinning and deformation twinning of NiTi shape memory alloy , 2016 .

[13]  Yong Liu,et al.  Effect of annealing on the transformation behavior and superelasticity of NiTi shape memory alloy , 2001 .

[14]  Ali Abolmaali,et al.  Hysteresis behavior of t-stub connections with superelastic shape memory fasteners , 2006 .

[15]  Jong Wan Hu,et al.  Numerical investigation on the cyclic behavior of smart recentering clip-angle connections with superelastic shape memory alloy fasteners , 2013 .

[16]  Kenneth S. Vecchio,et al.  Response of NiTi shape memory alloy at high strain rate: A systematic investigation of temperature effects on tension–compression asymmetry , 2006 .

[17]  Toshiyuki Sawa,et al.  805 The Effect of the Change in the Ambient Temperature on the Sealing Performance of Pipe Flange Connections with NiTi Shape Memory Alloy Gaskets , 2006 .

[18]  Li Hu,et al.  Multiple plastic deformation mechanisms of NiTi shape memory alloy based on local canning compression at various temperatures , 2016 .

[19]  Toshiyuki Sawa,et al.  Sealing Performance of Pipe Flange Connections With Shape Memory Alloy Gaskets Under Internal Pressure , 2004 .

[20]  Lucas Delaey,et al.  Asymmetry of stress–strain curves under tension and compression for NiTi shape memory alloys , 1998 .

[21]  M. Elahinia,et al.  Manufacturing and processing of NiTi implants: A review , 2012 .

[22]  Yufeng Zheng,et al.  Effect of ageing treatment on the deformation behaviour of Ti-50.9 at.% Ni , 2009 .

[23]  Xiaobing Ren,et al.  Origin of abnormal multi-stage martensitic transformation behavior in aged Ni-rich Ti–Ni shape memory alloys , 2004 .

[24]  Ken Gall,et al.  Tension–compression asymmetry of the stress–strain response in aged single crystal and polycrystalline NiTi , 1999 .

[25]  Jafar Khalil-Allafi,et al.  Multiple-step martensitic transformations in the Ni51Ti49 single crystal , 2010 .

[26]  Dimitris C. Lagoudas,et al.  Micromechanics of precipitated near-equiatomic Ni-rich NiTi shape memory alloys , 2014 .

[27]  Wolfgang Predki,et al.  Engineering applications of NiTi shape memory alloys , 2008 .

[28]  W. Huang,et al.  Stimulus-responsive shape memory materials: A review , 2012 .

[29]  Kai Li,et al.  R-phase transition and related mechanical properties controlled by low-temperature aging treatment in a Ti–50.8 at.% Ni thin wire , 2014 .

[30]  Rolf Lammering,et al.  Stress-induced transformation behavior of a polycrystalline NiTi shape memory alloy: micro and macromechanical investigations via in situ optical microscopy , 2004 .