scholarly journals Effects of Cold Working and Heat Treatment on Transformation Temperature of Ti-41.7Ni-8.5Cu (at%) Shape Memory Alloy and Its Probabilistic Prediction

2003 ◽  
Vol 52 (6Appendix) ◽  
pp. 167-173
Author(s):  
Maho HOSOGI ◽  
Nagatoshi OKABE ◽  
Toshio SAKUMA ◽  
Shuichi MIYAZAKI
Keyword(s):  
Heat Treatment ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Transformation Temperature ◽  
Cold Working ◽  
Probabilistic Prediction

Synthesis of Cu-Ni-Al Shape Memory Alloy by Powder Metallurgy

2018 ◽  
Vol 941 ◽  
pp. 1618-1622 ◽  
Author(s):  
Ayman Elsayed ◽  
Rabab Ibrahim ◽  
Mohamed Bahlol ◽  
Osama Dawood
Keyword(s):  
Heat Treatment ◽  
Powder Metallurgy ◽  
Shape Memory Alloy ◽  
Mechanical Alloying ◽  
Shape Memory ◽  
Transformation Temperature ◽  
Sintering Temperature ◽  
Al Alloy ◽  
Synthesis Route ◽  
Ar Gas

Synthesis of Cu-Ni-Al alloy has been realized by powder metallurgy. Mechanical alloying was used to produce shape memory alloy consisting of Cu, x Al, and 5wt, % Ni to study the effect of using the aluminum ratios of 12.5, 13, and 13.5 wt.% and sintering temperature on the transformation temperature. The process to obtain the alloy has included cold compaction at 600 MPa, Ar Gas sintering at 950 °C, die forging at 900 °C under the pressure of 500 MPa, and heat treatment at 850 °C followed by water quenching. The results have shown that the proposed synthesis route could be used to obtain the alloy with proper transformation and metallurgical properties.

Influence of Cold Working on Deformation Behavior and Shape Memory Effect of Ti-Ni-Nb

2005 ◽  
Vol 475-479 ◽  
pp. 1953-1956 ◽  
Author(s):  
Keisuke Okita ◽  
Nagatoshi Okabe ◽  
Toshio Sakuma ◽  
Hiromasa Semba ◽  
Yuji Mihara
Keyword(s):  
Heat Treatment ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Deformation Behavior ◽  
Shape Recovery ◽  
Cold Working ◽  
Applied Strain ◽  
Recovery Test ◽  
Shape Memory Properties ◽  
The Wire

Thermo-mechanical characteristic of shape memory alloy depends on cold working and heat treatment, because these processes can control the amount of defects including dislocation and precipitation [1]. In this study, the influence of cold working on the deformation behavior and the transformation characteristics was investigated on the Ti-Ni-Nb shape memory alloy (SMA). Both the tensile test and the shape recovery test were performed for the wire specimens of 1mm in the diameter with some different rates of cold working. The shape recovery tests were performed for the wire specimens of different cold working rates until the various levels of maximum applied strain, and the reverse-transformation characteristics on the process of heating after unloading were studied. It is clarified that the higher cold-working rate improves the shape memory properties of the alloy.

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