Unformatted text preview: mperature.
Another macroscopic property
coherent interface Anwith a strongseparatingtotwo bond-energy curve is
interface connection the phases
the coefﬁcient of thermal expansion, t h . As temperature increases, the atoms gain
where are able a one-to-one match of lattice planes
energy andthere isto “move up” the sides of the energy well. Figure 2.5–2a shows that
at across the boundary. to the energy E* there are two values of x with the same
a temperature corresponding
value of E*. If the atom is assumed to vibrate between these two positions, then the midcold working Plastic deformation of a metal or alloy
point represents an average separation distance. By drawing a series of constant-energy
at a temperature where dislocations are created faster
than they are annihilated.
component A chemical substance (element or
compound) used to specify the composition of an alloy.
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composites Materials formed by combining two or
more basic materials in which one material, called the
reinforcing phase, is in the form of ﬁbers, sheets, or
particles embedded in another material, called the
compression molding A process by which a raw
material is shaped by heating and squeezing into the
desired shape between two platens that act as molds.
concentration polarization A mechanism by which v ing two materials in which a
l is sandwiched between the
the temperature is raised
metal but not high enough to
ribe materials that are unable
g” but instead fracture
bjected to external loads. For
window is brittle, while the
ot. More precisely, brittle
drawn around a dislocation
that would normally close if
side of the circuit. FIGURE 2.5–1 v eristic angle between an atom
t neighbors. The term is most
ﬁc bond angles in covalent pg041 [R] G1 7-27060 / IRWIN / Schaffer pgm 1-19-98 plm 3-21-98 MP x Atomic Scale Structures Energy Energy Chapter 2 x B E* A
(a) (b) FIGURE 2.5–2 Relationship between the bond-energy curve and the coefﬁcient of thermal expansion. (a) The
dashed line passes through the midpoints of the constant-energy line segments and indicates that...
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