OS0203-134 Effect of heat-treatment conditions on shape memory characteristics of the tape-shape Ti-Ni element for SMA heat-engine produced by a centrifugal casting method

2015 ◽  
Vol 2015 (0) ◽  
pp. _OS0203-13-_OS0203-13
Author(s):  
Hiroumi FUJIKI ◽  
Chikara NAKAGAWA ◽  
Yuji TAKEDA ◽  
Hiroki Cho
Keyword(s):  
Heat Treatment ◽  
Shape Memory ◽  
Centrifugal Casting ◽  
Heat Engine ◽  
Casting Method ◽  
Treatment Conditions ◽  
Memory Characteristics

Ti-50.2Ni-5Zr Shape Memory Alloy Square Rots Production by the Casting Technique

2014 ◽  
Vol 783-786 ◽  
pp. 2445-2449
Author(s):  
K. Kitamura
Keyword(s):  
Shape Memory ◽  
Centrifugal Casting ◽  
Xrd Analysis ◽  
Casting Technique ◽  
Shape Memory Behavior ◽  
Phase Constituent ◽  
Treatment Conditions ◽  
Shape Memory Effects ◽  
Cold Rolled ◽  
Deformation Stress

The purpose of this study is to make the Ti-Ni-Zr specimen using casting method from P/M ingot and evaluates the shape memory behavior. All samples were square rod shape made by centrifugal casting. The size of all samples was 1 mm wide, 1.3 mm height and 37.5 mm length. The transformation behavior during cooling and heating was investigated using a differential scanning calorimeter (DSC). The phase constituent was determined by XRD analysis from 20 °C to 150 °C. Mechanical properties of the shape memory effects were measured using a tensile machine at 25 °C. The samples were annealed at 400 °C, 500 °C and 600 °C for 3.6 ks followed by water quenching. After annealing, specimens were cold rolled at 0 % (no rolling) and 10 %. The Ti-Ni-Zr square rod specimens are fabricated by centrifugal casting using P/M ingot. All samples had shape memory behavior. From DSC measurement, the highest reverse martensitic transformation temperature is 120 °C. From tensile test, the Luders like deformation stress were not constant and dependence of heat treatment conditions was not clarified. However, 10% cold rolling specimen, shape memory characteristics were stabilized.

The Effect of Heat Treatment on the Shape Memory Effect of Ni-Ti Alloy Ultra-Thin Wires

2011 ◽  
Vol 332-334 ◽  
pp. 912-915
Author(s):  
Dan Zhang ◽  
Lei Xu ◽  
Rui Wang ◽  
Li Feng Xu
Keyword(s):  
Heat Treatment ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Crystal Morphology ◽  
Treatment Temperature ◽  
Ti Alloy ◽  
Thin Wires ◽  
Treatment Conditions

Various heat treatment conditions with temperature scans of 300-700 °C, and annealing time scans of 1-4 hours were adopted in the annealing of Ti-49.5at.%-Ni shape memory alloy ultra thin wires. The mechanical hysteretic curves and the crystal morphology were obtained by the tensile-recovery testing and scan electric microscopes (SEM). The result shows that the shape memory effect of Ni-Ti alloy first decline after rising with the heat treatment temperature increases. Alloy with heat treatment effect in 500°C, presents the best. Time is not a significant factor for heat treatment.

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