Q. Define the polymorphism.

Ans. POLYMORPHISM: It is defined as the change in atomic structure which occurs at a definite transformation temperature. The cooling diagram of iron. Iron exists more than one atomic structure depending upon temperature.

The melting point of iron is 1539 degree C. When molten iron solidifies from the liquid state at 1539 degree C and just below 1539 degree C, then the iron has B.C.C. structure.

This structure is called delta iron. When it is further cooled at 1401 degree C. The structure now converts into F.C.C. structure.

This is called γ iron, it is non-magnetic on further drop in temperature i.e. at 910 degree C it again converts in two B.C.C. structure. This is called α-iron. The α-iron is non magnetic up to 768 degree C.

When further drop in temperature from 768 degree C it becomes magnetic but atomic structure remains unchanged.

Posted Date: 8/1/2012 9:01:41 AM | Location : United States

Ask an Expert

Related Discussions:- Polymorphism, Assignment Help, Ask Question on Polymorphism, Get Answer, Expert's Help, Polymorphism Discussions

Write discussion on Polymorphism
Your posts are moderated

Write your message here..

Related Questions

Radio and television , groun grid amplifier groun grid amplifier

Uihuihuiui, jihjihjihjihuih jihjihjihjihuih

Electronics, explain compensated semiconductors explain compensated semiconductors

Foreign exchange market and exchange rates, what is the equation relating t... what is the equation relating the real exchange rate to the nominal exchange rate and domestic and foreign price levels

LTE, LTE LTE

Financial management, Explain and identify the different sources of finance... Explain and identify the different sources of finances which are available to businesses and which sources of finance are internal sources and which are external sources?

Electrochemistry, can two metals such as iron and nickel be separated compl... can two metals such as iron and nickel be separated completely by electrogravimetry?

The pitch change mechanism , THE PITCH CHANGE MECHANISM : The cylinder... THE PITCH CHANGE MECHANISM : The cylinder backplate . The disc shaped backplate provides a mounting for the pitch change cylinder. This backplate fits in front of the propel

Drowsiness detection Device using image processing (Matlab), Hi. I am a fin... Hi. I am a final year student seeking help with my project. I am supposed to make a device that can detect the eye state of a person to determine whether he/she is sleepy/drowsy, P

Geology, write and explain the different geophysical methods write and explain the different geophysical methods