MEEN 222 - Exam 1 Notes

Isomorphus

Complete solubility of one component in another

Eutectic

liquid transforms to two solids

Eutectoid

one solid transforms to two solid phases

Peritectic

liquid & solid transforms to a second solid phase

Steel

< 2.06% carbon

Hypoeutectic

< 0.77% carbon

Austenite

gamma, FCC

Ferrite

alpha, BCC

Graphite

gamma-alpha transformation

Cementite

Fe3C

Proeutectoid

a material that forms or precipitates as a solid alloy cools, before the remaining material reaches a specific "eutectoid" temperature

Isomerism

Different arrangements or orientations of atoms in a molecule with the same molecular formula

Polymerism

Different arrangements of atoms in the crystal lattice of a material, resulting in multiple crystal structures.

Thermoplastic

Flexible linear chains

Thermoset

Ridgid three-dimensional network

Elastomers

Linear cross-linked chains

Isotactic

Stereoisomers polymer, all the same

Atactic

Stereoisomers polymer, all random

Sydiotactic

Stereoisomers polymer, all alternating

Orthorhombic

all lengths are different sizes

Polymer

Organic Non-Metal

Ceramic

Metal + Non-Metal

Metal

Metal

Linear Indices

1) Start & End, 2) End - Start, 3) Reduce Fraction [i = -(h + k)]

Miller Indices (Planear)

1) Intercept, 2) Inverse, 3) Reduce Fraction

Cast Iron

> 2.06 % carbon

Hypereutectic

> 0.77% carbon