AMCR MODULE 3

Question 1

The term ________ refers to all metals which have elements other than iron as their
base or principal constituent. This group includes such metals as aluminum, titanium,
copper, and magnesium, as well as such alloyed metals as Monel and Babbitt.

Answer 1

Non-Ferrous

Question 2

is a white lustrous metal which stands second in the
scale of malleability, sixth in ductility, and ranks high in its resistance to corrosion.

Answer 2

Pure Aluminum

Question 3

the principal alloying ingredients are manganese, chromium,
or magnesium and silicon show little attack in corrosive environments.

Answer 3

Aluminum Alloys

Question 4

Alloys in which
substantial percentages of copper are used are more?

Answer 4

susceptible to corrosive action

Question 5

The total percentage of alloying elements is seldom more than _____ percent in the
wrought alloys.

Answer 5

6 or 7%

Question 6

one of the most widely used metals in modern aircraft construction. It is
vital to the aviation industry because of its high strength to weight ratio and its
comparative ease of fabrication. The outstanding characteristic of it is its light
weight.

Answer 6

Aluminum

Question 7

Aluminum melts at the comparatively low temperature of ___?

Answer 7

1,250 °F

Question 8

The various types of aluminum

Answer 8

Casting Alloys and Wrought Alloys

Question 9

(those suitable for casting in
sand, permanent mold, or die castings)

Answer 9

Casting Alloys

Question 10

(those which may be shaped
by rolling, drawing, or forging).

Answer 10

Wrought Alloys

Question 11

Aluminum alloy castings are produced by one of
three basic methods:

Answer 11

(1) sand mold,
(2) permanent mold, or
(3) die cast.

Question 12

In ________, it must be remembered that in
most cases different types of alloys must be used
for different types of castings

Answer 12

casting aluminum

Question 13

require different
types of alloys than those used in permanent
molds.

Answer 13

Sand casting or sand die castings

Question 14

are used to obtain higher
mechanical properties, better surfaces, or more
accurate dimensions.

Answer 14

Permanent mold castings

Question 15

two specific types of permanent mold
castings:

Answer 15

(1) permanent metal mold with metal cores, and
(2) semi-permanent types containing sand cores.

Question 16

Two Types of Wrought Alloys

Answer 16

non-heat-treatable alloys and heat-treatable
alloys.

Question 17

are those in which the
mechanical properties are determined by the
amount of cold work introduced after the final
annealing operation.

Answer 17

Non-heat-treatable Alloys

Question 18

the mechanical properties are obtained by heat treating
to a suitable temperature, holding at that
temperature long enough to allow the alloying
constituent to enter into solid solution, and then
quenching to hold the constituent in solution.

Answer 18

Heat Treatable Aluminum Alloy

Question 19

are designated by a four-digit index system. The
system is broken into three distinct groups: 1xxx
group, 2xxx through 8xxx group, and 9xxx group
(which is currently unused).

Answer 19

Wrought aluminum and wrought aluminum alloys

Question 20

The first digit of a designation identifies the (aluminum)

Answer 20

alloy type

Question 21

The second digit indicates (aluminum)

Answer 21

specific alloy
modifications

Question 22

Should the second number be zero, it
would indicate no special control over individual
________. (aluminum)

Answer 22

impurities

Question 23

Digits 1 through 9, however, when
assigned consecutively as needed for the second
number in this group, indicate the number of? (aluminum)

Answer 23

controls over individual impurities in the metal.

Question 24

1100—99.00 percent

Answer 24

pure aluminum
with one control over individual
impurities.

Question 25

1130—99.30 percent

Answer 25

pure aluminum
with one control over individual
impurities.

Question 26

1275—99.75 percent

Answer 26

pure aluminum
with two controls over individual
impurities.

Question 27

In the 2xxx through 8xxx groups, the first digit indicates
the major alloying element used in the formation of the
alloy as follows:

Answer 27

➢ 2xxx—copper
➢ 3xxx—manganese
➢ 4xxx—silicon
➢ 5xxx—magnesium
➢ 6xxx—magnesium and silicon
➢ 7xxx—zinc
➢ 8xxx—other elements

Question 28

In the 2xxx through 8xxx alloy groups, the second digit
in the alloy designation indicates

Answer 28

Alloy Modifications

Question 29

If the second digit is zero, it indicates the? (2xxx-8xxx)

Answer 29

Original Alloy

Question 30

digits 1 through 9 indicate (2xxx-8xxx)

Answer 30

Alloy Modifications

Question 31

The last two of the four digits in the designation identify
the (2xxx-8xxx)

Answer 31

different alloys in the group