Iowa State MATE 2730 Exam 1 Flashcards

in the outermost orbitals (largest n value)

where are valence electrons found?

>1.8

What values of electronegativity are for ionic bonds?

0.5-1.8

What values of electronegativity are for polar covalent?

What values of electronegativity are for covalent bonds?

both are metals

When is a bond metallic?

bond length

length from y axis to net force (= 0)

bond energy

length from min potential energy to x axis

finding distances across lattices

1. identify location of points 2. multiply points by a b c values 3. distance formula

naming directions

1. tail is at origin 2. [a b c] 3. ALL VALUES INTEGERS

naming planes

1. origin cannot be in plane 2. find intercepts (if parallel to axis it is zero) 3. reciprocals 4. (h k l) 5. ALL VALUES INTEGERS

{h k l}

a family of cubic planes is written as

direction of simple cubic and hcp

1 atoms

how many atoms in sc?

direction of bcc

2 atoms

how many atoms in bcc and hcp?

direction of fcc

4 atoms

how many atoms in fcc?

{1 1 1}

close packed direction of fcc (abcabc)

ababababa

close packed direction of hcp

vacancy

missing atom

substitutional impurity

different atom

self-interstitial

atom wrong spot

interstitial impurity

diff. atom wrong spot

edge

extra 1/2 plane of atoms

screw

distortion due to lattice shearing

mixed

most dislocations

planar defects

free surfaces, grain boundaries, phase boundaries, twin boundaries

bulk/volume defects

void, bubble, pore, crack, scratch, inclusion

liquidus line

first solid appears on cooling

solidus

last liquid disappears on cooling

soluvus

solubility line in the solid state

eutetic

horizontal line

max solubility

point where solvus line = T

composition

bottom axis

alpha

before solvus line

alpha in L

alpha + L to coverall composition that crosses a solvus line/hypoeutetic

beta in alpha

alpha + beta before intersection line

alpha and beta

on intersection line in alpha + beta

hypoeutetic

before intersection line

hypereutetic

after intersection line

alpha in alpha and beta

alpha + beta (hypo)

beta in L

beta + L (hyper)

beta in alpha and beta

alpha + beta (hyper)

yield point/P

where linearity ends

yield stress

where material gives out

failure

top of stress strain curve

slope of stress strain curve

elastic modulus

toughess

area under curve up to failure

resilence

area under curve up to yield point

poisson's ratio

transverse (radius) / axial (length)