SHAPE MEMORY ALLOYS

INTRODUCTION
Shape memory alloys are the alloys which exhibit shape memory effect
If such alloys are plastically deformed at one temperature, they will completely recover their shape on being raised to a higher temperature
INTRODUCTION
In recovering their shape alloys can produce a displacement or force (or both in some cases) as a function of temperature
We can make metals change shape, change position, expand, compress with heat as the only activator
Because of these propert ....etc

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Novel shape memory effect (SME) and pseudoelastic behavior are discovered in single-crystalline Au, Cu, and Ni nanowires with lateral dimensions of 1.5-10 nm. Under tensile loading and unloading, these wires can recover elongations of up to 50%, well beyond the recoverable strains of 5-8% typical for most bulk shape memory alloys (SMAs). Results of atomistic simulations and evidences from experiments show that this phenomenon only exists at the nanometer scale and is associated with a reversible crystallographic lattice reorientation driven byt ....etc

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application of shape memory alloys ....etc

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I want it for studies in smart material. ....etc

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In metallic alloys at room temperature, atomic diffusion is typically very sluggish, and equilibrium or metastable phases do not undergo transformations. However, during plastic deformation, significant atomic mobility is possible. In addition, deformation may lead to mixing, possibly favoring the formation of nonequilibrium phases. In this talk, two examples will be presented, in which the rate of transformation to equilibrium is enhanced by mechanical deformation. In an unstable, nanocrystalline Fe50Cu50 solid solution, ball milling leads to ....etc

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SOLID ALUMINUM ALLOYS: A HIGH ENERGY DENSITY MATERIAL FOR SAFE ENERGY STORAGE, TRANSPORT, AND SPLITTING WATER TO MAKE HYDROGEN ON DEMAND
Outline
• Energy density and technology sustainability
• Brief history and technology overview
• What else we know about it
• Process flow and hydrogen delivery control
• Markets and applications
Energy density and technology sustainability
As hydrogen from splitting water:
• 1 Kg H2: 142 MJ = 39.4 kW-Hrs combustible energy
• 1 Kg Al* makes ....etc

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ARTICLE IN PRESS
+Model
JALCOM-17427; No.of Pages4
Journal of Alloys and Compounds xxx (2008) xxx“xxx
Mg
1.96-1.96x
Zn
1.96x
GeO
4
:Mn
0.04
phosphors for electroluminescent
display applications
G. Anoop, K. Mini Krishna, M.K. Jayaraj
*
Optoelectronic Devices Laboratory, Department of Physics, Cochin University of Science and Technology, Kochi 682022, Kerala, India
Received 27 June 2007; received in revised form 7 January 2008; accepted 9 January 2008
Abstract
Orthorhombic magnesium germenate (Mg
2
GeO
4
) doped with ....etc

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SHAPE MEMORY ALLOYS
Introduction
Shape memory alloys (SMA's) are metals, which exhibit two very unique properties, pseudo-elasticity, and the shape memory effect. Arne Olander first observed these unusual properties in 1938 (Oksuta and Wayman 1998), but not until the 1960's were any serious research advances made in the field of shape memory alloys. The most effective and widely used alloys include NiTi (Nickel - Titanium), CuZnAl, and CuAlNi.
The two unique properties described above are made possi ....etc

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Novel shape memory effect (SME) and pseudoelastic behavior are discovered in single-crystalline Au, Cu, and Ni nanowires with lateral dimensions of 1.5-10 nm. Under tensile loading and unloading, these wires can recover elongations of up to 50%, well beyond the recoverable strains of 5-8% typical for most bulk shape memory alloys (SMAs). Results of atomistic simulations and evidences from experiments show that this phenomenon only exists at the nanometer scale and is associated with a reversible crystallographic lattice reorientation driven byt ....etc

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Composites of shape memory alloys (SMA) with a matrix have been widely studied to suppress the propagation of damage. In these studies, the SMA is used as an actuator. A multi-functional SMA as both sensor and actuator is suitable for constructing intelligent material, such as a material with a sensing and suppressing function. The damage of materials is related to the amount of strain. We studied the use of SMA wire parts as sensors to measure the amount of strain for damage estimation. The acoustic emission (AE) signals induced by phase tran ....etc

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