EGR 270 - Materials Science Laboratory

Week 2 (Measurement standards)

Standards (powerpoint)

Caliper Calibration Data

Triple Point video part I (in the video, watch at least from the 30 sec mark to the 4:30 mark)
Triple Point video part II (watch through the 1:30 mark)
Optionally, watch the following from about 40-60 seconds onward:
The kelvin
The meter
The second
(note, there is a video near the bottom of the web page): the new definition of a kilogram and how it is determined

Week 3 (strain gage lab, calibration).

Week 4 tensile tesing
ASTM E8
Extensometer image
SATEC Load Frame
Blank data sheet

Week 5 - cold rolling and annealing of copper
Textbook Image for the lab (worth looking for educational reasons)

Week 6 - Precipitation HT of 2024 aluminum
Hint, reference information for your technical letter might include: aluminum-copper alloy phase diagram ; ASM Handbooks, on-line

Aging characteristics of alloy 2024 sheet (ASM Handbook, Volume 4). Note, hardness and tensile strength are directly related (but are not the same thing). The data was recorded at ROOM TEMPERATURE - after exposure to various temperatures/times; therefore, the changes in strength are due to changes in the microstructure (such as aging and overaging).

Rockwell B scale hardness data from long duration aging (for a material with hardness of 56 on the Rockwell B scale it is written as 56 HRB):

PHOTOS for precip. HT of alum.

 

Week 7 Jominy End Quench (heat treating of steel)

ASM Handbooks, on-line
Color vs. Temperature

fig_10_23

Week 8 - microscopy and spectroscopy. Labs will meet in SH103 (first floor nearest the commons).

Engineering material standards - what is typically defined by a material standard? An example.
Alloys are defined in-part by composition, how is composition adjusted (how to do you add 4.2wt% copper to aluminum alloy)?
How is composition of an alloy (or a distant star) measured?
•  Spectroscopy
•  Links on the course web page:
https://en.wikipedia.org/wiki/Spectral_line
https://en.wikipedia.org/wiki/Energy-dispersive_X-ray_spectroscopy
https://en.wikipedia.org/wiki/Auger_electron_spectroscopy

Week 9
Welding, Heat Affected Zone (HAZ)
Microscopy prep

Week 10
Ductile to Brittle Transistion using Charpy Impact Testing:
All previous labs, we studied the effect of microstructural changes on mechanical properties such as hardness. The microstructure changes were created either by coldworking or by heat treating. All testing was done at room temperature.

This week, we are studying the direct effect of temperature on impact toughness. Testing will be done at four (4) different temperatures! (~BP water, RT, ~freezing pt of water, BP of CO2).

For details: Charpy impact test

Week 12 - Residual Stress and Photoelasticity for visualizing stress (only in EGR070, no EGR270 labs this week)
Demonstrations of ways to visualize stress experimentally, including residual stress
Some intersting videos to watch: on-line Prince Rupert Drops (7 min) ; Glass bead takes a pounding; Glass hammer? Watch the bottle break; Mythbusters on glass (10 min) ; FEA in bending BB Hoops; Measuring (center hole technique)