phase diagrams

Phase Diagrams
Introduction:- Alloy phase diagrams are useful to metallurgists, materials engineers, and materials scientists in four major areas:
1. Development of new alloys for specific applications.
2. Fabrication of these alloys into useful configurations.
3. Design and control of heat treatment procedures for specific alloys that will produce the required mechanical, physical, and chemical properties.
4. Solving problems that arise with specific alloys in their performance in commercial applications, thus improving product predictability.
In all these areas, the use of phase diagrams allows research, development, and production to be done more efficiently and cost effectively.
Common Terms
Several commonly used terms are described below:
Phase Diagram: In order to record and visualize the result of studying the effect of stage variable on a system, diagrams were introduced to show the relationships between the various phases that appear within the system under equilibrium conditions, As such, the diagrams are variously called constitutional diagrams, equilibrium diagrams, or phase diagrams. A single-component phase diagram can be simply a one- or two-dimensional plot showing the phase change in the substance as temperature and/or pressure change. Most diagrams, however, are two-or three-dimensional plots describing the phase relationships in systems made up of two or more components, and these usually contain fields (areas) consisting of mixed-phase fields, as well as single-phase fields.
Phases: All materials exist in gaseous,