6.2

Question 1

what is a non ferrous metal

Answer 1

non magnetic metal that do not have iron as the base

Question 2

why is pure aluminium not used

Answer 2

it doesn’t have sufficient strength

Question 3

what ore does aluminium come from

Answer 3

bauxite ore

Question 4

what are the most common alloying agents for aluminium

Answer 4

copper, magnesium, manganese, zinc

Question 5

what is wrought aluminium

Answer 5

alloy that has been worked on mechanically

Question 6

what is the 1st digit identifying for wrought alloys

Answer 6

major alloying element

Question 7

what is the 2nd digit identifying for wrought alloys

Answer 7

alloying modification

Question 8

what are the last 2 digits identifying for wrought alloys

Answer 8

nothing they are just identifying within a group

Question 9

what are the 2 most common wrought alloys

Answer 9

2024 and 7075

Question 10

what is a clad aluminium alloy

Answer 10

alloy with a thin layer of pure aluminium surrounding it to protect against corrosion it is applied during the rolling process at low temperatures

Question 11

what is magnesium and what is the most popular type used

Answer 11

a light weight non metallic metal most common is AZ31

Question 12

what features does titanium and its alloys have

Answer 12

lightweight and very strong

Question 13

how is titanium corrosion resistant

Answer 13

thin layer of titanium oxide

Question 14

what are the features of alpha alloys

Answer 14

medium strength, can be welded and used in forging

Question 15

what are the features of alpha beta alloys

Answer 15

medium strength, generally not weldable, good forming characteristics

Question 16

what are the 2 most common nickel alloys

Answer 16

monel and inconel

Question 17

where is monel found

Answer 17

in gears and other parts that need high strength and toughness

Question 18

where is Inconel found

Answer 18

similar places to stainless steel

Question 19

what are copper and its alloys used for and why

Answer 19

electrical wiring because they are excellent thermal and electrical conductors

Question 20

why are clad materials limited to 3 reheats

Answer 20

otherwise the clad will mix with the core

Question 21

what are the two main classes for aluminium alloys

Answer 21

wrought and cast

Question 22

what is 1000 series for aluminium

Answer 22

pure aluminium

Question 23

what is the 2000 series’ principal alloying agent

Answer 23

copper,

Question 24

what is the 3000 series’ principal alloying agent and characteristics

Answer 24

manganese, generally considered non heat treatable

Question 25

what is the 4000 series' principal alloying agent and characteristics

Answer 25

silicon, lowers metal's melting temperature

Question 26

what is the 5000 series' principal alloying agent and characteristics

Answer 26

magnesium, good welding and corrosion resistant characteristics

Question 27

what is the 6000 series' principal alloying agent and characteristics

Answer 27

silicon and magnesium, makes metal heat treatable

Question 28

what is the 7000 series' principal alloying agent and characteristics

Answer 28

zinc, high tensile strength

Question 29

what is the 8000 series' alloying agent

Answer 29

small amounts of alloying elements such as iron lithium and nickel

Question 30

what is the 9000 series for

Answer 30

alloys that are unassigned at the moment

Question 31

what are 2 negatives to using magnesium

Answer 31

very reactive and highly susceptible to corrosion

Question 32

what does AZ31 mean in terms of magnesium alloy

Answer 32

the main alloying elements are aluminium and zinc and its 3%Al and 5%Zn

Question 33

what are the features of beta alloys

Answer 33

medium strength, excellent forming characteristics and have large quantities of high density alloying elements

Question 34

what are the three most used copper based alloys

Answer 34

brass, bronze and beryllium

Question 35

what are the two heat treatments used on aluminium

Answer 35

solution heat treatment and precipitation heat treatment

Question 36

what is solution heat treatment

Answer 36

process of heating aluminium alloy to allow alloying element to mix with base metal

Question 37

what happens once the aluminium alloy has been sufficiently heated in a solution heat treatment

Answer 37

it is then quenched in cold water and must be done within 10 seconds

Question 38

For large forging using solution heat treatment why is hot water quenching essential

Answer 38

hot water minimises distortion and alleviates cracking

Question 39

what is precipitation heat treatment

Answer 39

heated and when removed usually soft but hardens with ageing

Question 40

what is the difference between natural aged alloys and artificial aged alloys

Answer 40

natural aged alloys return to full strength in room temperature and artificial need to have thermal treatment to return to full strength

Question 41

what is the difference in annealing between steel and aluminium

Answer 41

aluminium must be cooled at a rate of 25C an hour until 260C then the rate doesn't matter

Question 42

what does T mean for alloy temper designations

Answer 42

alloy underwent a solution heat treatment

Question 43

what does T3 mean for alloy temper designations

Answer 43

alloy underwent a solution heat treatment followed by strain hardening

Question 44

what does T4 mean for alloy temper designations

Answer 44

alloy underwent a solution heat treatment followed by natural ageing

Question 45

what does T6 mean for alloy temper designations

Answer 45

alloy underwent a solution heat treatment followed by artificial ageing