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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hi I am enoch I would like to get the fact about factor affecting stability of coordinate compound. I am studying at University of goroka ....etc

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PRESENTED BY:
AVINANDAN SANDILYA


ALUMINIUM AND ITS ALLOYS
INTRODUCTION
 It is the third most abundant element of 8% on earth crust and normally found in oxide forms. It is a non-ferrous metal.
 It does not occur free in nature.
 Therefore it remained unknown until the nineteenth century.
ORES OF ALUMINIUM
ALLOYS OF ALUMINIUM
Designations of wrought aluminium alloys
Non-heat-treatable alloys
1xxx series (Super-purity and commercial-purity aluminium)
3xxx series (Al-Mn a ....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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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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application of shape memory alloys ....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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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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factors affecting the stability of coodination complexes ....etc

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