Vocab

Question 1

Process with no net accumulation or depletion of diffusing species

Answer 1

Steady State Diffusion

Question 2

Diffusion is a…

Answer 2

…Time dependent process

Question 3

Diffusion Flux…

Answer 3

…Does NOT change with time (During Steady State Diffusion)

Question 4

The concentration of diffusing species is a function of both time and position

Answer 4

Non-Steady State Diffusion

Question 5

A material having the same composition, structure, and properties everywhere under equilibrium conditions.

Answer 5

Phase

Question 6

Pure metals and/or compounds of which an alloy is composed

Answer 6

Component

Question 7

A series of possible alloys consisting of the same components, but
without regard to alloy composition

Answer 7

System

Question 8

Maximum concentration of solute atoms that may dissolve in the
solvent to form a solid solution

Answer 8

Solubility Limit

Question 9

The characteristics of the system do not change with time but persist indefinitely; the system is stable

Answer 9

Equilibrium

Question 10

Thermodynamic quantity describing the internal energy and disorder (entropy) of a system

Answer 10

Free Energy

Question 11

Nonequilibrium state that may persist for a very long time

Answer 11

Metastable

Question 12

A horizontal line constructed
across a two phase region of a binary phase
diagram

Answer 12

Tie Line

Question 13

A reaction where, upon cooling, a LIQUID phase transforms isothermally and reversibly into two intimately mixed SOLID phases

Answer 13

Eutectic Reaction

Question 14

A reaction where, upon cooling, one SOILD phase transforms isothermally and reversibly into two new SOLID phases that are intimately mixed

Answer 14

Eutectoid Reaction

Question 15

A reaction where, upon cooling, a SOLID and LIQUID phase transform isothermally and reversibly to a SOLID phase having a different composition

Answer 15

Peritectic Reaction

Question 16

A point on a binary phase diagram at which three phases are in equilibrium

Answer 16

Invariant Point

Question 17

A solid solution that exists over a composition range extending to either composition extremity of a binary phase diagram.

Answer 17

Terminal Solid Solution

Question 18

A solid solution or phase having a composition range that does not extend to either of the pure components of the system

Answer 18

Intermediate Solid Solution

Question 19

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

Answer 19

Intermetallic Compounds

Question 20

An element of the microstructure that has an identifiable and characteristic structure. It may consist of more than one phase such as pearlite

Answer 20

Microconstituent

Question 21

The structural features of an alloy
(e.g., grain and phase structure) that are subject to observation under a microscope

Answer 21

Micro Structure

Question 22

A heat treatment that enhances the ductility and
toughness of martensite and relieves the internal stresses

Answer 22

Tempering

Question 23

The softer, more ductile phase

Answer 23

Matrix Phase

Question 24

New phase of small particles, uniformly dispersed within the matrix

Answer 24

Precipates

Question 25

The initial departure from linearity of the stress
strain curve

Answer 25

Proportional Limit

Question 26

The stress at the maximum on the engineering stress-strain curve

Answer 26

Tensile Strenght

Question 27

A property of the metal and yield strength is usually cited for design purposes

Answer 27

Strength