Effect of heat treatment on the two-way recovery stress of tube-shaped NiTi

The effect of annealing temperatures on the thermomechanical behavior of NiTi in terms of transformation temperatures, mechanical properties, two-way shape memory strain, and two-way recovery stress was investigated experimentally to develop a NiTi tubular actuator with high two-way recovery force. Five tubular specimens were used to obtain the two-way shape memory strain and two-way recovery stress by varying heat treatment conditions. Annealing heat-treated temperatures were 400°C, 500°C, 600°C, 700°C, and 800°C. A two-way shape memory effect was introduced in the shape memory alloy tube by thermomechanical treatment after annealing heat treatment. According to the results, the two-way strain induced by shape memory cycling was independent of the annealing temperature. However, the two-way recovery stress generated by the two-way strain depended on the annealing temperature, even though the values of the two-way strain were similar in all specimens. Considering all heat treatment results, we concluded that the optimum annealing temperature to acquire two-way recovery stress and two-way strain for an actuator is 600°C.

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

[2]  Jan Van Humbeeck,et al.  Non-medical applications of shape memory alloys , 1999 .

[3]  G. Bourbon,et al.  The two way shape memory effect of shape memory alloys: an experimental study and a phenomenological model , 2000 .

[4]  Erhard Hornbogen,et al.  On the Influence of Thermomechanical Treatments on Shape Memory Alloys , 1997 .

[5]  T. Inaba,et al.  Two-Way Shape Memory Behavior Obtained by Combined Loading Training , 2001 .

[6]  J. Humbeeck,et al.  INFLUENCE OF ANNEALING ON RECOVERY STRESS OF COLD-WORKED Ni–Ti WIRE , 2009 .

[7]  S. Nenno,et al.  Nucleation and Self-Accommodation of the R-Phase in Ti–Ni Alloys , 1992 .

[8]  Hyun-Chul Kim,et al.  Development of a NiTi actuator using a two-way shape memory effect induced by compressive loading cycles , 2008 .

[9]  Ken Gall,et al.  Compressive response of NiTi single crystals , 2000, Acta Materialia.

[10]  Dimitris C. Lagoudas,et al.  Residual deformation of active structures with SMA actuators , 1999 .

[11]  Jung-Ju Lee,et al.  Two-way shape memory effect induced by repetitive compressive loading cycles , 2009 .

[12]  Shyi-Kaan Wu,et al.  A study on the wire drawing of TiNi shape memory alloys , 1996 .

[13]  Sung Ho Yoon,et al.  Experimental Investigation of Thermo-Mechanical Behaviors in Ni—Ti Shape Memory Alloy , 2008 .

[14]  J. Humbeeck,et al.  Effect of Annealing on Strain-Temperature Response under Constant Tensile Stress in Cold-Worked NiTi Thin Wire , 2011 .

[15]  Hong Yang,et al.  Effect of annealing on deformation-induced martensite stabilisation of NiTi , 2008 .

[16]  Yinong Liu,et al.  Apparent modulus of elasticity of near-equiatomic NiTi , 1998 .

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

[18]  P. McCormick,et al.  Influence of Heat Treatment on the Mechanical Behaviour of a NiTi Alloy , 1989 .

[19]  Dimitris C. Lagoudas,et al.  Influence of cold work and heat treatment on the shape memory effect and plastic strain development of NiTi , 2001 .

[20]  X. Ren,et al.  Physical metallurgy of Ti–Ni-based shape memory alloys , 2005 .

[21]  Jae Hyuk Lim,et al.  An experimental study of the two-way shape memory effect in a NiTi tubular actuator , 2010 .

[22]  K. Enami,et al.  Reversible shape memory effect , 1974 .

[23]  Yinong Liu,et al.  Factors influencing the development of two-way shape memory in NiTi , 1990 .

[24]  Ruth Lahoz,et al.  Training and two-way shape memory in NiTi alloys: influence on thermal parameters , 2004 .

[25]  W. Cai,et al.  The mechanisms of two way-shape memory effect in a Cu-Zn-Al alloy , 1997 .

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

[27]  Dazhi Yang,et al.  Influence of heat treatment on the fatigue life of a laser-welded NiTi alloy wire , 2007 .