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Unformatted text preview: ists of
according to the and in pleasure boat hulls.
various thermosetting resins and, more recently, thermoplastic polymers reinforced by
phase A homogeneous portion of matter bounded by
glass, carbon, boron, or organic ﬁbers. The mechanical and physical properties of some a
surface so that it is
typical PMCs are listed in Table 14.4–1.mechanically separate from any other
phase diagram A graphical representation showing the
phase or phases present Menu given composition Contents
| e-Text Main for a | Textbook Table of as a
function of temperature.
phosphorescence Luminescence that persists more
than 10 8 s after the stimulus is removed.
photoconductivity An increase in electrical
conductivity brought about by photostimulation.
photolithography A process that utilizes ultravioletlight–sensitive polymers to etch small devices on an
integrated chip. photovoltaic Describing production of
stimulation with light or electromagnetic
usually in solid-state devices.
physical vapor deposition (PVD) A p
vapor-phase particles of the coating mate
created and then deposited on the workp
thin, uniform coating.
piezoelectric effect The production of
current brought about by changing a mat
dimensions, usually with stress.
Pilling-Bedworth (PB) ratio The volu
one mole of oxide divided by the volume
consumed to create one mole of oxide.
pitting corrosion A highly localized fo
usually involving oxygen concentration g
result from surface deposits of contamina
stagnant pools of electrolyte located on h
sections of metal.
planar density The number of atoms o
on a crystallographic plane per unit area
plastic deformation Deformation that
for example, a metal part that has been p
is said to have undergone plastic deforma
pn junction diode A microelectronics
posed of adjacent layers of p-type and nconductors that serves to pass current in
while (essentially) blocking current in the
point defect A “mistake” in the mater
a single atom, ion, lattice site, or interstit
example, if an atom is missing at a regula
point defect is said to have been formed.
The negative ratio o
strain divided by the longitudinal strain i
polarization Separation of positive an
charge in a material, usually by an electr
vector sum of all the dipoles in a materia
volume is the polarization.
polycrystalline Describing a solid, usu
joined crystals or grains.
polymer Engineering material compos
high–molecular-weight molecules. These
usually have either a linear (chain) struct
three-dimensional network structure.
polymer-matrix composites Composit
which the matrix material is a polymer.
polymorphic Allotropic; capable of m
powder metallurgy A process consisti
very small particles of metallic powders
solidating them in the form of near-net-s
components. pg594 [V] G2 7-27060 / IRWIN / Schaffer Part III 12.01.98 plm QC2 rps MP1 Properties TABLE 14.4–1 Properties of some typical MMC and PMC composites in the longitudinal and transverse directions. Fiber Al
2-D glass cloth...
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