What is the lever arm rule?
What is the lever arm rule?
In chemistry, the lever rule is a formula used to determine the mole fraction (xi) or the mass fraction (wi) of each phase of a binary equilibrium phase diagram.
What is lever rule in phase diagram?
Lever rule: An expression of conservation of matter in which the relative phase amounts are determined from the overall alloy composition and the coexisting phase compositions, assumed to be in global equilibrium at each temperature. From: Methods for Phase Diagram Determination, 2007.
What is tie line rule?
So, the left side of the tie line gives the proportion of the liquid phase (the phase to the right), and the right side of the tie line gives the proportion of the alpha phase (the phase on the left). Remember: you use the length of the line which is furthest from the phase in which you are interested.
What is the application of lever rule in phase diagram in engineering metallurgy?
Lever Rule Shown is a partial binary phase diagram for the Copper-Nickel system with the alloy Cu-35 wt% Ni at the vertical line. At the point, a, the alloy is a liquid. Upon cooling it passes through the two-phase (a + L) zone and then solidifies as a single phase substitutional alloy.
What is a liquidus line?
The Liquidus Line is the line (or lines) on a phase diagram above which only liquid is present. Technically it is “the locus of temperatures above which only liquid is stable”. Associated terms: Solidus, Phase Diagram.
How is Gibbs phase rule define?
The Gibbs phase rule p+n=c+1 gives the relationship between the number of phases p and components c in a given alloy under equilibrium conditions at constant pressure, where n is the number of thermodynamic degrees of freedom in the system.
What is meant by phase rule?
The phase rule states that F = C − P + 2. Thus, for a one-component system with one phase, the number of degrees of freedom is two, and any temperature and pressure, within limits, can be attained.
What is Eutectoid alloy?
Eutectic alloys have two or more materials and have a eutectic composition. When a non-eutectic alloy solidifies, its components solidify at different temperatures, exhibiting a plastic melting range. Conversely, when a well-mixed, eutectic alloy melts, it does so at a single, sharp temperature.
What is solidus and liquidus?
Simply put, liquidus is the lowest temperature at which an alloy is completely liquid; solidus is the highest temperature at which an alloy is completely solid. Pure metals are fluid, and they melt at a single temperature.
What is the peritectic point?
Peritectic point – The point on a phase diagram where a reaction takes place between a previously precipitated phase and the liquid to produce a new solid phase. When this point is reached, the temperature must remain constant until the reaction has run to completion.