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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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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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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 trans ....etc

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looking for ppt presented by engineering students on grain refinement of aluminium alloys ? ....etc

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SHAPE MEMORY ALLOYS
1. INTRODUCTION
A shape memory alloy (SMA) (also known as memory metal or smart wire) is a metal that remembers its geometry. After a sample of SMA has been deformed from its original conformation, it regains its original geometry by itself during heating (one-way effect) or, at higher ambient temperatures, simply during unloading (pseudo-elasticity or superelasticity). These extraordinary properties are due to a temperature-dependent martensitic phase transformation from a low-symmetry to a highly s ....etc

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ARTICLE IN PRESS
+Model
JALCOM-17427; No.of Pages4
Journal of Alloys and Compounds xx (2008) xx xx
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 mangane ....etc

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