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mod 6 > 6.2 > Flashcards

6.2 Flashcards

level 1 questions

1
Q

what is a non ferrous metal

A

non magnetic metal that do not have iron as the base

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2
Q

why is pure aluminium not used

A

it doesn’t have sufficient strength

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3
Q

what ore does aluminium come from

A

bauxite ore

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4
Q

what are the most common alloying agents for aluminium

A

copper, magnesium, manganese, zinc

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5
Q

what is wrought aluminium

A

alloy that has been worked on mechanically

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6
Q

what is the 1st digit identifying for wrought alloys

A

major alloying element

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7
Q

what is the 2nd digit identifying for wrought alloys

A

alloying modification

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8
Q

what are the last 2 digits identifying for wrought alloys

A

nothing they are just identifying within a group

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9
Q

what are the 2 most common wrought alloys

A

2024 and 7075

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10
Q

what is a clad aluminium alloy

A

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

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11
Q

what is magnesium and what is the most popular type used

A

a light weight non metallic metal most common is AZ31

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12
Q

what features does titanium and its alloys have

A

lightweight and very strong

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13
Q

how is titanium corrosion resistant

A

thin layer of titanium oxide

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14
Q

what are the features of alpha alloys

A

medium strength, can be welded and used in forging

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15
Q

what are the features of alpha beta alloys

A

medium strength, generally not weldable, good forming characteristics

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16
Q

what are the 2 most common nickel alloys

A

monel and inconel

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17
Q

where is monel found

A

in gears and other parts that need high strength and toughness

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18
Q

where is Inconel found

A

similar places to stainless steel

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19
Q

what are copper and its alloys used for and why

A

electrical wiring because they are excellent thermal and electrical conductors

20
Q

why are clad materials limited to 3 reheats

A

otherwise the clad will mix with the core

21
Q

what are the two main classes for aluminium alloys

A

wrought and cast

22
Q

what is 1000 series for aluminium

A

pure aluminium

23
Q

what is the 2000 series’ principal alloying agent

A

copper,

24
Q

what is the 3000 series’ principal alloying agent and characteristics

A

manganese, generally considered non heat treatable

25
Q

what is the 4000 series’ principal alloying agent and characteristics

A

silicon, lowers metal’s melting temperature

26
Q

what is the 5000 series’ principal alloying agent and characteristics

A

magnesium, good welding and corrosion resistant characteristics

27
Q

what is the 6000 series’ principal alloying agent and characteristics

A

silicon and magnesium, makes metal heat treatable

28
Q

what is the 7000 series’ principal alloying agent and characteristics

A

zinc, high tensile strength

29
Q

what is the 8000 series’ alloying agent

A

small amounts of alloying elements such as iron lithium and nickel

30
Q

what is the 9000 series for

A

alloys that are unassigned at the moment

31
Q

what are 2 negatives to using magnesium

A

very reactive and highly susceptible to corrosion

32
Q

what does AZ31 mean in terms of magnesium alloy

A

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

33
Q

what are the features of beta alloys

A

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

34
Q

what are the three most used copper based alloys

A

brass, bronze and beryllium

35
Q

what are the two heat treatments used on aluminium

A

solution heat treatment and precipitation heat treatment

36
Q

what is solution heat treatment

A

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

37
Q

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

A

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

38
Q

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

A

hot water minimises distortion and alleviates cracking

39
Q

what is precipitation heat treatment

A

heated and when removed usually soft but hardens with ageing

40
Q

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

A

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

41
Q

what is the difference in annealing between steel and aluminium

A

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

42
Q

what does T mean for alloy temper designations

A

alloy underwent a solution heat treatment

43
Q

what does T3 mean for alloy temper designations

A

alloy underwent a solution heat treatment followed by strain hardening

44
Q

what does T4 mean for alloy temper designations

A

alloy underwent a solution heat treatment followed by natural ageing

45
Q

what does T6 mean for alloy temper designations

A

alloy underwent a solution heat treatment followed by artificial ageing

mod 6 (10 decks)

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