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The ability to learn is a gift The capacity to learn is a skill The willingness to learn is a choice - Rebec of Ginaz. tensile. yield. tensile/yield. Re: question from last class - Mech prop data for annealed plain carbon steels. Also from last class: Densities of some materials:

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slide1

The ability to learn is a gift

The capacity to learn is a skill

The willingness to learn is a choice

- Rebec of Ginaz

slide2

tensile

yield

tensile/yield

Re: question from last class -

Mech prop data for annealed

plain carbon steels

slide3

Also from last class:

Densities of some materials:

Al alloys 2.63-2.82 gm/cm3

steels 6.92-9.13

Ti alloys 4.43-4.70

Mg alloys 1.77-1.78

Cu alloys 7.47-8.94

glasses 2.4-2.7

HDPE 0.96

PMMA 1.22

epoxies 1.25

slide4

Lotus versatile vehicle architecture system (VVA)

Almost completely "aluminum" - high pressure die-castings, stampings, and extrusions

Advanced Materials & Processes, July 2005, p 29

Al???

slide5

OK…..which "aluminum" is it?

1050 1145 2014 2024 2219 2618

3003 3004 3105 4032 4043 5005

5052 5083 5154 5182 5262 5652

6010 6061 6262 6463 7005 7050

7072 7075 7175 7178 7475 7229

.

.

.

slide6

Does NOT contain 0.61% carbon

OK…..which "aluminum" is it?

1050 1145 2014 2024 2219 2618

3003 3004 3105 4032 4043 5005

5052 5083 5154 5182 5262 5652

6010 6061 6262 6463 7005 7050

7072 7075 7175 7178 7475 7229

Alloy designation NOT same as steels

In fact, no carbon at all in ordinary Al alloys

slide7

1050 1145 2014 2024 2219 2618

3003 3004 3105 4032 4043 5005

5052 5083 5154 5182 5262 5652

6010 6061 6262 6463 7005 7050

7072 7075 7175 7178 7475 7229

slide8

Number Major alloy addition

1xxx -

2xxx Cu

3xxx Mn

4xxx Si

5xxx Mg

6xxx Mg & Si

7xxx Zn

8xxx other

Here’s the scoop -

slide9

Yield strength Tensile strength

Low-strength 30 ksi 60 ksi

steel

Pure aluminum 5 ksi 13 ksi

Al alloy 2024-T4 47 ksi 68 ksi

So, does alloying affect the properties?

Al alloy containing 4.4% Cu (say 2024) can be heat treated to strength level much higher than that of pure Al

slide10

So, does alloying affect the properties?

Al alloy containing 4.4% Cu (say 2024) can be heat treated to strength level much higher than that of pure Al

Yield strength Tensile strength

Low-strength 30 ksi 60 ksi

steel

Pure aluminum 5 ksi 13 ksi

Al alloy 2024-T4 47 ksi 68 ksi

What’s this??

slide11

T4 designates a heat treatment (Al alloys only)

"solution heat-treated, quenched, and naturally aged to a substantially stable condition"

slide12

T4 designates a heat treatment (Al alloys only)

"solution heat-treated, quenched, and naturally aged to a substantially stable condition"

How do we know this works?…….& why does it make the material stronger?

slide13

A portion of the Al-Cu

"phase diagram"

How do we know it works?

We consult a road map for the material system

slide23

A new concept - the solid solution

A single phase Cu-Zn alloy is formed

Then, where are the Zn atoms??

slide24

Assignments for next class:

1. review today's classnotes; know

aluminum alloy designation schemes; know

what a phase is; where do the Zn atoms go?

2. check syllabus materials at:

http://www.ems.psu.edu/~ryba/coursework/259/matse%20259.html

3. Read more of chapter 6

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