Temperature Memory Effect of Ti-Ni-Hf-Y High Temperature Shape Memory Alloy

2017 ◽  
Vol 898 ◽  
pp. 598-603
Author(s):  
Jun Li ◽  
Xiao Yang Yi ◽  
Wei Hong Gao ◽  
Wen Long Song ◽  
Xiang Long Meng
Keyword(s):  
High Temperature ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Memory Effect ◽  
Thermal Cycle ◽  
Thermal Cycles ◽  
Solution Treated ◽  
Temperature Memory Effect ◽  
Lower Temperature ◽  
Complete Transformation

Temperature memory effect in the solution-treated Ti-Ni-Hf-Y high temperature shape memory alloy (HTSMA) was investigated. The results showed that the temperature memory effect induced by the partial cycling could be detected in the subsequent complete transformation cycling for the solution-treated Ti-Ni-Hf-Y alloy. The temperature memory effect is one-time phenomenon. However, the temperature memory effect could last at least 20 times when the sample was employed 10 times complete thermal cycles. Multiple-steps temperaure memory effect can be observed as the sample undergoes the lower temperature partial thermal cycle in sequence. The mechanisms of the temperature memory effect were discussed in this paper.

Martensitic Transformation Behavior and Shape Memory Effect of an Aged Ni-rich Ti-Ni-Hf High Temperature Shape Memory Alloy

2008 ◽  
Vol 138 ◽  
pp. 399-406 ◽  
Author(s):  
Xiang Long Meng ◽  
Yu Dong Fu ◽  
Wei Cai ◽  
J.X. Zhang ◽  
Qing Fen Li ◽  
...  
Keyword(s):  
High Temperature ◽  
Martensitic Transformation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Aging Temperature ◽  
Transformation Behavior ◽  
Transformation Temperatures ◽  
Solution Treated

The martensitic transformation behavior and shape memory effect (SME) have been investigated in a Ni-rich Ti29.6Ni50.4Hf20 high temperature shape memory alloy (SMA) in the present study. After aging, the transformation temperatures of Ti29.6Ni50.4Hf20 alloy increase obviously due to the precipitation of (Ti,Hf)3Ni4 particles. And the transformation sequence changes from one-step to two-step. When the experimental alloy is aged at different temperatures for 2h, the transformation temperatures increase rapidly with increasing the aging temperature and then change slightly with further increasing the aging temperature. Most of the martensite variants preferentially oriented in the aged Ti29.6Ni50.4Hf20 alloy. The aged Ti29.6Ni50.4Hf20 alloy shows the better thermal stability of transformation temperatures than the solution-treated one because the precipitates depress the introduction of defects during thermal cycling. In addition, the proper aged Ti29.6Ni50.4Hf20 alloy also shows the larger SME than the solution-treated one since the precipitates strengthen the matrix strongly.

Effect of aging on transformation behavior and shape memory effect of a CuAlNb high temperature shape memory alloy

2006 ◽  
Vol 41 (18) ◽  
pp. 6165-6167 ◽  
Author(s):  
Z. Y. Gao ◽  
Y. Wu ◽  
Y. X. Tong ◽  
W. Cai ◽  
Y. F. Zheng ◽  
...  
Keyword(s):  
High Temperature ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Transformation Behavior

Two way shape memory effect in NiTiHf high temperature shape memory alloy tubes

2019 ◽  
Vol 163 ◽  
pp. 1-13 ◽  
Author(s):  
C. Hayrettin ◽  
O. Karakoc ◽  
I. Karaman ◽  
J.H. Mabe ◽  
R. Santamarta ◽  
...  
Keyword(s):  
High Temperature ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect

Thermal cycle stability of Co64V15Si17Al4 high-temperature shape memory alloy

2020 ◽  
Vol 260 ◽  
pp. 126930
Author(s):  
Yanqing Zhang ◽  
Hengxing Jiang ◽  
Xingjun Liu ◽  
Lusheng Huang ◽  
Shuiyuan Yang ◽  
...  
Keyword(s):  
High Temperature ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Thermal Cycle ◽  
Cycle Stability

Effect of Aging on Mechanical Properties of Ti-Mo-Al Biomedical Shape Memory Alloy

2010 ◽  
Vol 654-656 ◽  
pp. 2150-2153 ◽  
Author(s):  
Hideki Hosoda ◽  
Makoto Taniguchi ◽  
Tomonari Inamura ◽  
Hiroyasu Kanetaka ◽  
Shuichi Miyazaki
Keyword(s):  
Mechanical Properties ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Shape Recovery ◽  
Tensile Tests ◽  
Single Step ◽  
Two Phase ◽  
Solution Treated

Effects of single- and multi-step aging on mechanical properties and shape memory properties of Ti-6Mo-8Al (mol%) biomedical shape memory alloy were studied using tensile tests at room temperature (RT). The solution-treated alloy at RT was two phase of bcc β and martensite α". Tensile tests revealed that the solution-treated alloy exhibited good shape memory effect. As for the single-step aging, (1) pseudoelastic shape recovery by unloading was observed after aging at 623K, (2) the alloy became brittle after aging at 773K due to ω embrittlement, and (3) strength was improved with small shape memory effect by aging at 1023K. On the other hand, after a multistep aging at 773K-1023K-1123K, the alloy was strengthened and showed perfect shape recovery. The improvement must be achieved by the formation of fine and uniform hcp α precipitates.

scholarly journals Temperature Memory Effect Induced by Incomplete Transformation in Ni-Mn-Ga-based Shape Memory Alloy

2015 ◽  
Vol 2 ◽  
pp. S867-S870 ◽  
Author(s):  
M.Z. Zhou ◽  
X. Zhang ◽  
X.L. Meng ◽  
W. Cai ◽  
L.C. Zhao
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Memory Effect ◽  
Temperature Memory Effect

Microstructure, mechanical properties and shape memory effect of Ni–Mn–Ga–B high-temperature shape memory alloy

2016 ◽  
Vol 68 ◽  
pp. 113-117 ◽  
Author(s):  
Xin Zhang ◽  
Qingsuo Liu ◽  
Xianshun Zeng ◽  
Jiehe Sui ◽  
Wei Cai ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect
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