scholarly journals Shape Memory Effect in an Ordered Fe3Pt Alloy Associated with the FCC-FCT Thermoelastic Martensite Transformation

1985 ◽  
Vol 26 (7) ◽  
pp. 523-524 ◽  
Author(s):  
Ryuichiro Oshima ◽  
Seiji Sugimoto ◽  
Masaaki Sugiyama ◽  
Tokio Hamada ◽  
Francisco Eiichi Fujita
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Martensite Transformation ◽  
Pt Alloy

Development of High-Temperature Shape Memory Alloys above 673 K

2016 ◽  
Vol 879 ◽  
pp. 107-112 ◽  
Author(s):  
Yoko Yamabe-Mitarai
Keyword(s):  
High Temperature ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Martensite Transformation ◽  
Shape Recovery ◽  
Solid Solution Hardening ◽  
Alloying Element ◽  
Solution Hardening

TiPd was investigated as a candidate of high-temperature shape memory alloys. To improve shape recovery, solid-solution hardening by addition of alloying element has been performed. The effect of alloying on martensite transformation temperature, shape memory effect, and yield strength of martensite and austenite phases were investigated. Zr and Hf were found to be effective element to improve shape memory effect. The most important factor to improve shape memory effect of TiPd is temperature to form Ti2Pd3 precipitates rather than strengthening.

scholarly journals Study of Co-Ni-Al Alloys with Magnetically Controlled Shape Memory Effect

2009 ◽  
Vol 635 ◽  
pp. 75-80 ◽  
Author(s):  
Irina I. Kositsyna ◽  
V.A. Zavalishin
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Martensite Transformation ◽  
Melt Spinning ◽  
Al Alloys ◽  
Helium Atmosphere ◽  
Melt Spun ◽  
Transformation Hysteresis ◽  
Start Temperature

The methods of electron microscopy, resistometry and magnetometry are used to study ten (36-38)Co - (32-36)Ni - (27-30)Al (at. %) alloys. Cast coarse-crystalline and microcrystalline alloys made by melt spinning in a helium atmosphere are considered. It is shown that the martensite start temperature Ms becomes 30-50°C lower as grains are refined to 1 m m. Replacement of 1 at. % cobalt by nickel and 1 at. % aluminum by nickel makes the temperature interval of the В2«L10 martensite transformation (30-60)°C and (100-110)°C higher respectively. The martensite transformation hysteresis is about 100 degrees. The melt-spun Co38Ni34Al28 alloy with the transformation temperatures Мs = 31°С, Мf = –34°С, Аs = –6°С, Аf = 70°С and Тс = 98°С is a material possessing the magnetically controlled shape memory effect.

Tensile Failure of 55-Nitinol Wire

1975 ◽  
Vol 33 ◽  
pp. 46-47
Author(s):  
F. I. Grace
Keyword(s):  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Stoichiometric Composition ◽  
Tensile Failure ◽  
Initial State ◽  
Initial Shape ◽  
Nitinol Wire ◽  
Cscl Type ◽  
Shear Transformation

An interest in NiTi alloys with near stoichiometric composition (55 NiTi) has intensified since they were found to exhibit a unique mechanical shape memory effect at the Naval Ordnance Laboratory some twelve years ago (thus refered to as NITINOL alloys). Since then, the microstructural mechanisms associated with the shape memory effect have been investigated and several interesting engineering applications have appeared.The shape memory effect implies that the alloy deformed from an initial shape will spontaneously return to that initial state upon heating. This behavior is reported to be related to a diffusionless shear transformation which takes place between similar but slightly different CsCl type structures.

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