Introduction to Phase Diagrams (4 Parts)

Synopsis

1: Introduces cooling curves for single and dual component alloy systems and illustrates the empirical measurement of melting points for pure components from the arrest. Introduces for binary alloys the concept of solidification over a temperature range, together with definitions of liquidus and solidus temperatures. Animations show how cooling curves for a range of alloy compositions can be used to generate the equilibrium phase diagram.
2: Reviews the definition of the constitution of an alloy. A portion of a phase diagram for a hypothetical alloy solidifying to a solid solution is used throughout, with the focus on the liquid + solid phase field. Introduces the use of tie lines to measure the composition of the phases in the liquid + solid phase field and shows how these compositions change with temperature. Also considers the proportions of each phase. Explains the lever rule in both graphical and mathematical terms and presents an exercise for calculating the compositions and proportions of each phase.
3: Shows an example of an alloy system (Cu-Ni) whose components are completely miscible in the solid state. Notes the necessary conditions for this to occur, i.e. similar crystal structure, atomic size and valency. Illustrates the concept of solid solubility using two-dimensional animation showing different atoms diffusing at random within a close-packed lattice. Shows an alloy containing 50 weight % Ni, and presents a related exercise. Explains the development of microstructure during cooling and relates this to the phase diagram.
4: Using the Ag-Cu system as an example, explains the different phase regions of the phase diagram, with an exercise on identifying the eutectic temperature and composition from the diagram. The student is asked for the phase transformations for a range of Ag-Cu compositions, follow by multiple-choice questions on the constitution of a number of Ag-Cu alloys at various temperatures. Looks at cooling curves for this type of system and the relationship between microstructure and phase diagram. Simulates the development of microstructures during cooling for alloys of eutectic, hypoeutectic, hypereutectic and off-eutectic composition.

Series

Matter: Materials Science on Cd-Rom

Language

English

Country

Great Britain

Medium

Multimedia; Computer program. Floppy disk. PC Windows or Apple Macintosh (separate versions).

Year of production

1995

Availability

Sale

Notes

Available to UK higher education institutions.

Uses

Undergraduate engineering and materials science.

Subjects

Engineering

Keywords

computer-assisted learning; engineering teaching; materials science; phase diagrams; Teaching & Learning Technology Programme

Credits

Writer

Andrew Green; Trevor Myers

Distribution Formats

Type

CD-ROM

Sections

Title

Construction of phase diagrams from thermal analysis data

Synopsis

1: Introduces cooling curves for single and dual component alloy systems and illustrates the empirical measurement of melting points for pure components from the arrest. Introduces for binary alloys the concept of solidification over a temperature range,

Title

Alloy constitution

Synopsis

2: Reviews the definition of the constitution of an alloy. A portion of a phase diagram for a hypothetical alloy solidifying to a solid solution is used throughout, with the focus on the liquid + solid phase field. Introduces the use of tie lines to measu

Title

Simple alloy systems

Synopsis

3: Shows an example of an alloy system (Cu-Ni) whose components are completely miscible in the solid state. Notes the necessary conditions for this to occur, i.e. similar crystal structure, atomic size and valency. Illustrates the concept of solid solubil

Title

Eutectic alloy systems

Synopsis

4: Using the Ag-Cu system as an example, explains the different phase regions of the phase diagram, with an exercise on identifying the eutectic temperature and composition from the diagram. The student is asked for the phase transformations for a range o

Distributor

Name

Institute of Materials

Phone

020 7839 4071

Fax

020 7839 2078

Address

Publishing Division
1 Carlton House Terrace
London
SW1Y 5DB

Name

University of Liverpool

Web

http://www.liv.ac.uk/~matter/home.html External site opens in new window

Phone

0151-794 4664

Address

Department of Materials Science
PO Box 147
Senate House
Abercromby Square
L69 3BX

Notes

Contact: Professor Peter J Goodhew, e-mail: goodhew@liv.ac.uk