4 The Nature Of Materials And Solid-State Changes And Metals

Question 1

Materials having some degree of plasticity,relatively high hardness and strength,good electrical and thermal conductivity,crystalline when solids and opacity

Answer 1

Metals

Question 2

A change of state from a solid directly to a gas is known as

Answer 2

Sublimation

Question 3

Network groupings of identical unit cells that are aligned in parallel planes

Answer 3

Space Lattices

Question 4

How many types of crystal lattice are there

Answer 4

14

Question 5

Made up of nine atoms eight are located on the corners of the cube ninth position centrally between them

Answer 5

Box centered cubic lattice

Question 6

Chromium, iron, molybdenum, tantalum, tungsten, and vanadium are examples of what lattice

Answer 6

Box centered cubic Lattice

Question 7

Consists of 14 atoms with eight at the corners and the other six centered in the cubic face

Answer 7

Face centered cubic lattice

Question 8

Aluminum, copper, gold, lead, nickel, platinum, and silver are examples of what lattice

Answer 8

Face centered cubic lattice

Question 9

Consist of 17 atoms,seven atoms are located in each hexagon face with one at each corner and the seventh in the center

Answer 9

Hexagon Close Packed Lattice

Question 10

Cadmium, cobalt, magnesium, titanium, and zinc are examples of what Lattice

Answer 10

Hexagon close-packed Lattice

Question 11

Missed placed atoms are in layers about the grains are known as

Answer 11

Grain boundaries

Question 12

Deformation of metallic crystals occurs in three ways

Answer 12

Slip, twinning, and rotational deformation

Question 13

Occurs by translation or sliding between the atomic planes within a grain

Answer 13

Slip Deformation

Question 14

Grains deform by twisting or re-orientating a band of adjacent lattice forms with each unit cell remaining in contact with the same neighbor it had before deformation

Answer 14

Twinning Deformation

Question 15

A shift in the grains of rotational deformation of portions of the crystal lattice

Answer 15

Rotational Deformation

Question 16

After a large percentage of grains have been reorientated by action of considerable deformation work, the metal is likely to take on a directional properties called

Answer 16

Fibering

Question 17

Work accomplished below the recrystallization temperatures for the particular material

Answer 17

Cold work

Question 18

Electrical properties and corrosion resistance are improved and residual stress are reduced during what process

Answer 18

Stress Relief (Recovery)

Question 19

Recovery of ductility to permit further change of shape by deformation can be obtained only by elimination of the deformation grains, and this is accomplished by

Answer 19

Recrystallization

Question 20

Recrystallization at a higher temperatures is sometimes also called stress relieving. The same process may be referred to as

Answer 20

Process Annealing

Question 21

If fine grain structures is desired after the recrystallization process, it is necessary to reduce the temperature quickly to prevent subsequent grain growth. This is usually performed by some kind of

Answer 21

Quench

Question 22

Metal alloys that display a variable solid-state solubility of one metal in another with change of temperature may be susceptible to

Answer 22

Age hardening

Question 23

One of the greatest uses of precipitation hardening is for improvement of properties of some

Answer 23

Aluminum alloys

Question 24

NDT methods capable of indicating changes in electrical conductivity and to some extent can provide absolute measures of electrical conductivity

Answer 24

Eddy Current and Thermo electric methods

Question 25

When steel is heated to or above the critical temperature, the value of which is dependent upon the alloy percentages, and held at temperatures for some period of time, carbon unites in a solid solution with iron in the gamma or face centered cubic lattice form is known as

Answer 25

Austenitizstion

Question 26

The heat treating process for softening and regaining ductility in connection with cold working a material is known as

Answer 26

Annealing

Question 27

When steel is not reduce to it softest condition and the pearlite is left rather fine instead of course is known as

Answer 27

Normalizing

Question 28

Minimum hardness and maximum ductility of steel can be produced by a process called

Answer 28

Spheroidizing

Question 29

NDT surface examinations that can detect cracks by either heating or quenching are

Answer 29

MT PT ET

Question 30

Consist of quenching an austenitized steel in a salt bath at a temperature about that needed for the start of martensite formation is known as

Answer 30

Martempering

Question 31

When steel is held at the bath temperature for a longer period and the results of the isothermal treatment is the formation of bainite this is known as

Answer 31

Austempering

Question 32

Steel that has been hardened by heat treatment and then stress relieved, softened, and provided with increased ductility by reheating is known as

Answer 32

Tempering or Drawing

Question 33

Deterioration of metals by the chemical action of some surrounding or contracting medium which may be liquid, gas, or some combination of the two is known as

Answer 33

Corrosion

Question 34

Technique used to detect and record the progression of cracking due to stress corrosion is known as

Answer 34

Acoustic Emissions

Question 35

A localized corrosion by which pits that extend deep into the metal develop

Answer 35

Pitting

Question 36

A serious type of corrosion is created when the attack is against the grain boundaries is known as

Answer 36

Intercrystalline Corrosion

Question 37

Technique that is particularly effective in detection and accurate measurement of overall thinning that results from corrosion

Answer 37

Ultrasonic

Question 38

Commonly applied to detect corrosion and corrosion thinning in interior and otherwise inaccessible regions of assemblies, insulated components, and the like

Answer 38

Radiography

Question 39

Used to monitor the initiation and growth of stress corrosion and hydrogen embrittlement cracks

Answer 39

Acoustic Emissions