This document discusses alloys and phase diagrams. It defines a binary alloy as a mixture of two metals and describes an isomorphous system as one where the two metals are completely soluble in both the liquid and solid states, forming a single crystal structure. The phase diagram for a binary isomorphous alloy system is divided into three zones by the liquidus and solidus lines: a liquid zone above the liquidus line, a liquid+solid zone between the lines, and a solid zone below the solidus line. Examples of isomorphous systems given are copper-nickel, antimony-bismuth, gold-silver, and chromium-molybdenum. Questions at the end ask to differentiate isomorphous and e
1. ME 8491 ENGINEERING METALLURGY
M.KARTHIKEYAN
ASSISTANT PROFESSOR
DEPARTMENT OF MECHANICAL ENGINEERING
AAA COLLEGE OF ENGINEERING & TECHNOLOGY, SIVAKASI
karthikeyan@aaacet.ac.in
2. Constitution of alloys – Solid solutions, substitutional
and interstitial – phase diagrams, Isomorphous,
eutectic, eutectoid, peritectic, and peritectoid reactions,
Iron – carbon equilibrium diagram. Classification of steel
and cast Iron microstructure, properties and application.
UNIT I ALLOYS AND PHASE DIAGRAMS
3. A mixture of two metals is called a binary alloy.
Isomorphous system:
Two metals completely soluble in the liquid state and solid state.
Single type of crystal structure exists.
The phase diagram is divided into three separate areas
Liquid zone
Liquid + Solid zone
Solid zone
ISOMORPHOUS SYSTEM OR PHASE DIAGRAM FOR BINARY
ISOMORPHOUS ALLOY SYSTEM
4.
5. The phase diagram is divided into three separate areas by two phase
boundaries namely
Liquidus line.
Solidus line.
Above the Liquidus line – uniform liquid solution.
Below the Solidus line – single solid solution.
Between the Liquidus & Solidus line – liquid and solid solution
solution coexist.
Examples of Isomorphous system:
Copper – nickel system.
Antimony – Bismuth system.
Gold – silver system.
Chromium – Molybdenum system.
6. 1. Differentiate isomorphous and eutectic reaction
2. Draw a typical phase diagram of isomorphous alloy system
3. Explain the isomorphous system and peritectoid reaction
QUESTIONS
