Achieving improved workability and competitive high temperature shape memory performance by Nb addition to Ni-Ti-Hf alloys

2021 ◽  
Vol 191 ◽  
pp. 161-166
Author(s):  
J.N. Lemke ◽  
F. Gallino ◽  
M. Cresci ◽  
A. Coda
Keyword(s):  
High Temperature ◽  
Shape Memory ◽  
Memory Performance ◽  
Nb Addition

The effect of phthalide cardo structure on the shape memory performance of high-temperature resistant epoxy resins

2018 ◽  
Vol 5 (11) ◽  
pp. 115702 ◽  
Author(s):  
Rong Ren ◽  
Zhaopeng Zhang ◽  
Xuhai Xiong ◽  
Lu Zhou ◽  
Xichao Guo ◽  
...  
Keyword(s):  
High Temperature ◽  
Shape Memory ◽  
Epoxy Resins ◽  
Memory Performance

A Study on Shape Memory Performance of Cu-Al-Ni-Be Alloy Single Crystal

2011 ◽  
Vol 287-290 ◽  
pp. 21-25
Author(s):  
Hua Ping Xu ◽  
Gao Feng Song ◽  
Xie Min Mao
Keyword(s):  
High Temperature ◽  
Temperature Gradient ◽  
Shape Memory Alloy ◽  
Single Crystal ◽  
Shape Memory ◽  
Directional Solidification ◽  
Memory Performance ◽  
Copper Base ◽  
Shape Memory Properties ◽  
Solidification Furnace

In this paper, single crystal of CuAlNiBe quaternary shape memory alloy was prepared in a high temperature gradient directional solidification furnace with a selective growing crystallizer. And its shape memory performance characters were systematically compared with other series copper base shape memory alloys. The results show that the single crystal of CuAlNiBe quaternary shape memory alloy has better shape memory properties.

scholarly journals High-Temperature-Induced Shape Memory Copolyimide

Polymers ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 3222
Author(s):  
Yucheng Zi ◽  
Dongxu Pei ◽  
Jianhua Wang ◽  
Shengli Qi ◽  
Guofeng Tian ◽  
...  
Keyword(s):  
High Temperature ◽  
Shape Memory ◽  
Shape Recovery ◽  
Memory Performance ◽  
Crosslinking Density ◽  
Polyimide Films ◽  
Film Properties ◽  
Chain Entanglement ◽  
Chain Mobility ◽  
The Relationship

A series of polyimide (PI) films with a high-temperature-induced shape memory effect and tunable properties were prepared via the facile random copolymerization of 4,4′-oxydianiline (ODA) with 4,4′-(hexafluoroisopropyl)diphthalic anhydride (6FDA) and 4,4′-oxydiphthalic anhydride (ODPA). The trigger temperature can be controlled from 294 to 326 °C by adjusting the ratio of monomers. The effects of monomer rigidity on the chain mobility, physical properties, and shape memory performance of as-prepared copolyimide were systematically investigated. The introduction of ODPA could enhance the mobility of PI macromolecular chains, which made chain entanglement more likely to occur and increased the physical crosslinking density, thereby improving the PI’s shape recovery up to 97%. Meanwhile, the existence of 6FDA enabled PI films to set quickly at low temperatures with a shape fixation of 98%. The shape memory cycling characteristics of the polyimide films are also studied, and the relationship between the PI chemical structure and the film properties are further discussed.

Effect of Carbon Nanotubes on the Shape Memory Performance of Poly(vinylidene fluoride)/Acrylic Blends

2013 ◽  
Vol 30 (2) ◽  
pp. 134
Author(s):  
Hui FU ◽  
Jishan QIU ◽  
Ning CHONG ◽  
Yaqing WANG ◽  
Yuanyuan TIAN ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Shape Memory ◽  
Vinylidene Fluoride ◽  
Memory Performance ◽  
Poly Vinylidene Fluoride

Effects of training on the thermomechanical behavior of NiTiHf and NiTiZr high temperature shape memory alloys

2020 ◽  
Vol 794 ◽  
pp. 139857 ◽  
Author(s):  
O. Karakoc ◽  
K.C. Atli ◽  
A. Evirgen ◽  
J. Pons ◽  
R. Santamarta ◽  
...  
Keyword(s):  
High Temperature ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Thermomechanical Behavior

Design of recyclable, fast-responsive and high temperature shape memory semi-aromatic polyamide

Polymer ◽  
2021 ◽  
Vol 216 ◽  
pp. 123427
Author(s):  
Guang-ming Yan ◽  
Han Wang ◽  
Dong-sheng Li ◽  
Hao-ran Lu ◽  
Sui-lin Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Shape Memory ◽  
Aromatic Polyamide

scholarly journals Laser welding of H-phase strengthened Ni-rich NiTi-20Zr high temperature shape memory alloy

2021 ◽  
Vol 202 ◽  
pp. 109533
Author(s):  
J.P. Oliveira ◽  
Jiajia Shen ◽  
J.D. Escobar ◽  
C.A.F. Salvador ◽  
N. Schell ◽  
...  
Keyword(s):  
High Temperature ◽  
Shape Memory Alloy ◽  
Laser Welding ◽  
Shape Memory

scholarly journals Laboratory-Scale Processing and Performance Assessment of Ti–Ta High-Temperature Shape Memory Spring Actuators

2021 ◽  
Author(s):  
A. Paulsen ◽  
H. Dumlu ◽  
D. Piorunek ◽  
D. Langenkämper ◽  
J. Frenzel ◽  
...  
Keyword(s):  
High Temperature ◽  
Shape Memory ◽  
Detrimental Effect ◽  
Wire Drawing ◽  
Fast Heating ◽  
Heating And Cooling ◽  
Arc Melting ◽  
Ω Phase ◽  
And Performance

AbstractTi75Ta25 high-temperature shape memory alloys exhibit a number of features which make it difficult to use them as spring actuators. These include the high melting point of Ta (close to 3000 °C), the affinity of Ti to oxygen which leads to the formation of brittle α-case layers and the tendency to precipitate the ω-phase, which suppresses the martensitic transformation. The present work represents a case study which shows how one can overcome these issues and manufacture high quality Ti75Ta25 tensile spring actuators. The work focusses on processing (arc melting, arc welding, wire drawing, surface treatments and actuator spring geometry setting) and on cyclic actuator testing. It is shown how one can minimize the detrimental effect of ω-phase formation and ensure stable high-temperature actuation by fast heating and cooling and by intermediate rejuvenation anneals. The results are discussed on the basis of fundamental Ti–Ta metallurgy and in the light of Ni–Ti spring actuator performance.

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