AMIE INDIA Students Forum

[manish24verma]

FICK'S FIRST LAW

THE RATE OF DIFFUSION IS DIRECTLY PROPORTIONAL TO CONCENTRATION GRADIENTIN STEADY STATE CONDITION MEANS IF CONCENTRATION DOES NOT AFFECTED BY TIME OR THERE ARE NO CHANGES IN SYSTEM WITH TIME.
RATE OF DIFFUSION = - D * dC/dX
WHERE D IS DIFFUSION COEFFICIENT .
THE NEGATIVE SIGN SHOWS POSITIVE FLOW OF PARTICLES i.e HIGH TO LOW CONCENTRATION.
THE RATE OF DIFFUSION IS IN ATOMS MOVED PER SQ METER PER SEC THE CONCENTRATION IN ATOMS PER CUBIC METER ,X IN METERS AND HENCE D IN METER SQ PER SEC.

[salunkesg]

Dear Sir
Information provided you are very useful
I also downloaded solved question papers as per ur link

Keep providing such valuable material

Thanks
Sanjay

[manish24verma]

PHASE RULE
The no of phases in an alloy is depend on the no of elements of which it is composed of .From thermodynamic consideration of equilibrium , Gibb’s derived the following phase rule.
F=C+p+2
Where F= Degrees of freedom of system
(temp,press,concentration , composition of
phases)
C= No of components forming the system
(i.e elements or compounds)
P= No of phases in the alloy
(in equilibrium system)
2=No of external factors
Generally temp and pressures are considered as external factors which determine the state of alloys .Metals are mostly used at atm press. Thus pressure has not any appreciable effect on equilibrium of alloys in solid and liquid state.

[rohit badoni]

hi dear,
thanking you,please send me the study materials of material science if you have at rohitbadoni@gmail.com

[manish24verma]

fitt hai boss!
ye material jutaane ka funda hai agar material hai to yaha daalo