Got a tricky question? Receive an answer from students like you! Try us!

Diffusion in aluminium alloys, Hot deformation (rolling) of aluminium alloys and its dynamic recovery, dynamic recrystallisation - Dissertation Example

Only on StudentShare
Author : hailey03

Summary

Chapter 2: Literature Review: Diffusion of Aluminum alloys 2.1 Diffusion Diffusion or the movement of solute particles from high concentration to low concentration in order to obtain an equilibrium and even spread forms the basic mechanism through which processes like homogenization, solution and aging occur…

Extract of sample
Diffusion in aluminium alloys, Hot deformation (rolling) of aluminium alloys and its dynamic recovery, dynamic recrystallisation

The activation energy and diffusion constants are calculated using a variety of factors like the solid solubility, alloying content and the state of the matrix microstructure in terms of grain boundary size, dislocation density and vacancy concentration [PAPM]. The mean distance travelled by the atom during diffusion in turn is dependent on the rate of diffusion D as follows: L = (Dt)? Where L = the mean distance travelled by the atom. t = time (s) All atoms above absolute zero (-273oC) vibrate and the frequency of vibrations acts as the driving force for the movement of the atoms or for their diffusion. The frequency of vibration and diffusion increases with the rise in temperature. However, for atoms to be able to move from one lattice point to the other, the atoms need to overcome the activation energy. This activation energy is low around the metal surface and at the grain boundaries, and this is the reason for the high concentration of the precipitating solute at the grain boundaries. ...
Download paper

Related Essays

A Feasibility Study of Building Structural Deformation Monitoring using Global Positioning (GPS)
To achieve their objectives through this study, the authors monitored structural deformations in one high-rise building, viz. the Twin Tower of Science and Technology Complex, and one low-rise building, viz. the Innovation Centre Building, both of which belonged to the University Technology MARA (UiTM), in Selangor, Malaysia. The authors chose high accuracy GPS (±1 mm) and total station (± 1 mm, 1”) to apply in deformation monitoring of the buildings, to improve accuracy of the survey. During the course of the study, authors identified appropriate points on the building structure, and…
7 pages (1757 words)
Dynamic Behaviours of Vehicle Tyres
Nearly all forms of vehicles utilise tyres in order to interface engine energy with the road. Vehicles use tyres for a number of different purposes since vehicle tyres control a number of different driving characteristics. In the simplest terms, vehicle tyres are responsible directly for road traction, steering control, supporting the vehicle’s load and for braking control. In addition, vehicle tyres serve as an important part of the overall suspension by providing the initial cushion against shocks for vehicles travelling on the road. Modern vehicle tyres are constructed in a rather…
16 pages (4016 words)
Materials and Hardware
The Change from One Material to Another in Aircraft Development The method for the choice of materials for aircraft development has changed over the years. For the Flyer, the Wright brothers utilized the first cast aluminium engine block and the major drivers for the material chosen were static strength and weight. The materials used on the main airframe were wood covered with a fabric. Wood is a natural compound possessing long fibres of cellulose, which are held together by a weaker matrix of lignin. The use of wood as a material for the aircraft structure illustrates that the use of…
10 pages (2510 words)
lab report- materials
Steel is artificially produced and it exists in different forms of iron. Whereas steel has carbon content which is less than that of pig iron, its carbon content is more than that of wrought iron. Moreover, steel has such qualities as elasticity, hardness, as well as strength, which depends on the heat treatment and composition (Makelainen and Hassinen 488). Consequently, it is categorized as either having low, medium or high carbon content. On the other hand, aluminium is a silvery white metallic element that is ductile and has low density as well as high strength to weight ratio and is…
3 pages (753 words)
Mechanical Dynamic
Designers now face a higher challenge of product development and thus they require better tools and equipment for testing. Mechanical dynamics is one important and useful factor today. Dynamic mechanical was established initially as a simple heating and air conditioning company which started out in Sacramento. The major requirement was to make its customers happy through the use of it. It started out in 2003 with one operation which basically led to its growth. It was used in the commercial sector widely. Michael V the owner of dynamic mechanical was basically associated with construction…
5 pages (1255 words)
Emergency Response and Recovery
. Level. Assignment No…. Assignment Task . Chosen topic . Required words.Actual words. Date due. Date submitted. Emergency Response and Recovery Introduction The government of the United Kingdom has strived to ensure that the country and its agencies are prepared fully for all emergencies types.
10 pages (2510 words)
Dynamic of percussive enginnering
Mineral is present in a specific region. A region where diamond is present might not be the places for oil & gas which can be take out. The rock arrangement differs. The whole foundation is diverse. Therefore after identification of the mineral, appropriate process is selected for excavation. Drilling is one of the excavation processes and there are various types of drilling and percussive drilling is one of the old methods for drilling (Treadway, C., 1997). The objective of this study is to methodologically modeling & simulation of the structure under ultrasonic percussive drilling. The study…
30 pages (7530 words)