which of the following is not an example of primary bonding?
covalent bonding occurs as a result of _________ sharing.
bonds in most metals are referred to as ______.
if the electron configuration of fe is 1s2 2s2 2p6 3s2 3p6 3d6 4s2, then the electron configurations for the fe3 is 1s2 2s2 2p6 3s2 _____.
how many atoms does the face centered cubic unit cell contain?
the crystal structure of cu is
the coordination number of bcc crystal structure is
the atomic packing factor for fcc is
interstitial solid solution belongs to
substitutional atom (impurity) is an example of
one explanation for why graphite powder acts so well as a “solid lubricant”is
edge and screw dislocations differ in what way?
vacancy diffusion is usually interstitial one.
during elastic deformation, a metal experiences
hardness is a measure of
materials with the greatest toughness
structural engineering steels are sometimes found to be brittle
in a pure metal the mechanis of strengthening available are:
the phase diagram of sn-pb alloy is called
the phase(s) present for a 85 wt% sn–15 wt% pb alloy at 200 c is (are)
the α phase indicates ______.
the boundary above which only liquid phase exist is called _________.
a copper-nickel alloy is high-temperature heat treated; the diffusion of cu into ni and ni into cu regions is referred to as _____________.
which of the following metal has lower value of diffusion coefficient in silicon at about 550 c and is preferred as interconnects in integrated circuits.
the driving force for steady-state diffusion is the __________.
___________ is the property by virtue of which a body tends to regain its original shape and size when external forces are removed.
engineering stress-strain curve and true stress-strain curve are equal up to
in a plain steel that contains 0.2 percentage carbon, we should expect:
the maximum solubility of c in γ-austenite - solid solution is
we have an annealed carbon steel which has hardness of 150hbs. suppose we know the hardness of pearlite is 200hbs and the hardness of ferrite is 80hbs, determine the carbon amount of this steel.
which of the following plane has the highest planar density for fcc.
strain hardening is also named as
strength is increased by making dislocation motion
during heat treatment of steel, austenite transforms into martensite by
heating the cold-worked metal progresses in three stages:
in the as-quenched state, martensite is very hard and so brittle that a heat treatment known as_________must be accomplished sequently.
the heat-treatable aluminum alloy can be strengthened by
the cooling rate for normalizing is faster than that of annealing.
in a plain carbon steel, bainite can be produced by continuous cooling.
the driving force behind the recrystallization process is the stored energy of the material.
steels are readily used after the heat treatment of quenching.
a steel should be used below its ductile-to-brittle transition temperature.
martensite is a product of a diffusionless transformation.
thermosetting plastics are those that do not soften when heated.
to obtain an steel with fine pearlite we perform the commercial heat treatment known as total annealing.
martempering needs to be performed during quenching thick sections of steels to avoid surface crack formation.