Vocab Flashcards
Process with no net accumulation or depletion of diffusing species
Steady State Diffusion
Diffusion is a…
…Time dependent process
Diffusion Flux…
…Does NOT change with time (During Steady State Diffusion)
The concentration of diffusing species is a function of both time and position
Non-Steady State Diffusion
A material having the same composition, structure, and properties everywhere under equilibrium conditions.
Phase
Pure metals and/or compounds of which an alloy is composed
Component
A series of possible alloys consisting of the same components, but
without regard to alloy composition
System
Maximum concentration of solute atoms that may dissolve in the
solvent to form a solid solution
Solubility Limit
The characteristics of the system do not change with time but persist indefinitely; the system is stable
Equilibrium
Thermodynamic quantity describing the internal energy and disorder (entropy) of a system
Free Energy
Nonequilibrium state that may persist for a very long time
Metastable
A horizontal line constructed
across a two phase region of a binary phase
diagram
Tie Line
A reaction where, upon cooling, a LIQUID phase transforms isothermally and reversibly into two intimately mixed SOLID phases
Eutectic Reaction
A reaction where, upon cooling, one SOILD phase transforms isothermally and reversibly into two new SOLID phases that are intimately mixed
Eutectoid Reaction
A reaction where, upon cooling, a SOLID and LIQUID phase transform isothermally and reversibly to a SOLID phase having a different composition
Peritectic Reaction
A point on a binary phase diagram at which three phases are in equilibrium
Invariant Point
A solid solution that exists over a composition range extending to either composition extremity of a binary phase diagram.
Terminal Solid Solution
A solid solution or phase having a composition range that does not extend to either of the pure components of the system
Intermediate Solid Solution
A compound of two metals that has a distinct chemical formula. On a phase diagram it appears as an intermediate phase that exists over a very narrow range of compositions
Intermetallic Compounds
An element of the microstructure that has an identifiable and characteristic structure. It may consist of more than one phase such as pearlite
Microconstituent
The structural features of an alloy
(e.g., grain and phase structure) that are subject to observation under a microscope
Micro Structure
A heat treatment that enhances the ductility and
toughness of martensite and relieves the internal stresses
Tempering
The softer, more ductile phase
Matrix Phase
New phase of small particles, uniformly dispersed within the matrix
Precipates
The initial departure from linearity of the stress
strain curve
Proportional Limit
The stress at the maximum on the engineering stress-strain curve
Tensile Strenght
A property of the metal and yield strength is usually cited for design purposes
Strength
